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2025 IEEE Topical Conference on rF/Microwave Power Amplifiers for radio and Wireless Applications, PAWr 2025

作者： Chu, Chenhao Torii, Takuma Shinjo, Shintaro Yamanaka, Koji Wang, Hua Group Zurich Switzerland Information Technology R&d Center Mitsubishi Electric Corporation Kamakura Japan

ISBN: (纸本)9798331507275

The sixth-generation (6G) wireless communication is emerging by exploring the Frequency range 3 (Fr3) band, spanning from 7 to 24 GHz, i.e., the centimeter-wave (cm-Wave) band. This article presents a two-stage GaN MMIC power amplifier (PA) operating in the upper-mid range of Fr3. A transmission-line-based output matching network is designed to achieve continuous Class-B/J operation, ensuring high efficiency over a wide bandwidth. The fabricated PA chip attains a saturated power-added efficiency (PAEsat) of 34.6-45.9% with an output power (Psat) of 35.1-36.7 dBm from 10 to 16 GHz. At 12 GHz, when tested with a 122.88 MHz 64-QAM signal with a peak-to-average power ratio (PAPr) of 7.12 dB, the PA achieves an average output power (Pavg) of 31.4 dBm, an average PAE (PAEavg) of 28.0%, an EVMrms of -26.9 dB, and ACPrs of -35.0/-37.8 dBc. With a 100 MHz 12.83 dB PAPr 64-QAM 5G Nr signal, it achieves a Pavg of 30.6 dBm and a PAEavg of 25.7%, with ACPrs of -28.2/-31.0 dBc. © 2025 IEEE.

关键词： Gallium nitride

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Microstructure evolution and phase transformation of the mushy zone in a quenchedβ-solidifying TiAl alloy

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Journal of Materials Science & technology 2024年第2期169卷 28-41页

作者： Fuqiang Zhang Xianfei ding Leming Xu Xin Feng Hai Nan Jianping He Yongfeng Liang Junpin Lin State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China Cast Titanium Alloy R&D Center Beijing Institute of Aeronautical MaterialsBeijing 100095China

This study investigates the phase constitutions and transformations that occur in the mushy zone and in the adjacent phase fields of a directionally solidified Ti-44Al-8Nb-1Cr alloy via quenching *** results indicate that the mushy zone consists of unmeltedβdendrites and interdendritic liquid,whose formation can be attributed to the difference in melting point aroused by local heterogeneity in ***βdendrite is composed of numerous subgrains with various *** quenching,theβdendrite transforms into Widmanstättenαvia a precipitation reaction,owing to the decreasing cooling rate caused by heat transfer from the surrounding ***,after quenching,the interdendritic liquid is transformed intoγ*** the singleβphase field and the lower part of the mushy zone,a massive transformation ofβtoγ***,in theβ+αphase field,bothβandαphases are retained to ambient *** the heating process,the transformation ofα→βgives rise to the formation ofβvariants,which affects the orientation ofβdendrites in the mushy *** growth kinematics of theα→βtransformation was elucidated,revealing the preferential growth directions of111and112forβ***,this study presents an illustration of the formation process of the mushy zone and the microstructural evolution during the heating and quenching process.

关键词： Titanium aluminides Mushy zone Quenching Electron backscattering diffraction Phase transformation

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Green biomanufacturing promoted by automatic retrobiosynthesis planning and computational enzyme design

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Chinese Journal of Chemical Engineering 2022年第1期35卷 6-21页

作者： Ziheng Cui Shiding Zhang Shengyu Zhang Biqiang Chen Yushan Zhu Tianwei Tan National Energy R&D Center for Biorefinery College of Life Science and TechnologyBeijing University of Chemical TechnologyBeijing 100029China

Biomanufacturing,which uses renewable resources as raw materials and uses biological processes to produce energy and chemicals,has long been regarded as a production model that replaces the unsustainable fossil *** construction of non-natural and efficient biosynthesis routes of chemicals is an important goal of green *** methods that rely on experience are difficult to support the realization of this ***,with the rapid development of information technology,the intelligence of biomanufacturing has brought hope to achieve this *** and computational enzyme design,as two of the main technologies in intelligent biomanufacturing,have developed rapidly in recent years and have made great achievements and some representative works have demonstrated the great value that the integration of the two fields may *** achieve the final integration of the two fields,it is necessary to examine the information,methods and tools from a bird’s-eye view,and to find a feasible idea and solution for establishing a connection *** this purpose,this article briefly reviewed the main ideas,methods and tools of the two fields,and put forward views on how to achieve the integration of the two fields.

关键词： Biomanufacturing retrobiosynthesis Computational enzyme design Biobased chemicals

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Modulation Signal Optimized Synchronous PWM 27

Modulation Signal Optimized Synchronous PWM

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27th International Conference on Electrical Machines and Systems, ICEMS 2024

作者： Kojima, Tetsuya Tachibana, Tomoya Kondo, Shota Kitao, Junji Takahashi, Tomohira Advanced Technology R&d Center Mitsubishi Electric Corporation Amagasaki661-8661 Japan

ISBN: (纸本)9784886864406

Suppression of low-order harmonics is important as recently large-radius machines are widely used and the generated acoustic noise is amplified through mode zero natural frequency in the audible range. Synchronous PWM is generally used to drive large machines, but cannot avoid low-order harmonics. On the other hand, optimized pulse patterns (OPPs) can eliminate arbitrary harmonics while minimizing distortion of phase current, but additionally require dedicated hardware for implementation. This paper first reveals a constraint on switching instants of synchronous PWM, and then proposes a novel modulation method based on synchronous PWM. The proposed method achieves the optimization like OPPs under the constraint, but does not require the dedicated hardware. In addition, control of the torque and stator current is simply implemented like synchronous PWM. The proposed method was verified by simulations and experiment. The results verified that the proposed method almost removes problematic harmonics caused by synchronous PWM while suppressing the current distortion and achieves almost the same transient response as synchronous PWM. © 2024 The Institute of Electrical Engineers of Japan.

关键词： Pulse width modulation

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development of ASIL B Safety Integrity Level rotational Position Sensor

Development of ASIL B Safety Integrity Level Rotational Posi...

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2024 International Conference on Artificial Intelligence, Computer, data Sciences, and Applications, ACdSA 2024

作者： Ozturk, Ferhan Kilinc, Ugur Gokturk, Mehmet Makersan R&d Center Gebze Turkey Institute of Information Technology Gtu Gebze Turkey

ISBN: (纸本)9798350394528

This study focuses on the development of an innovative position sensor, adhering to the rigorous ISO 26262 standard's ASIL B safety integrity level. The sensor setup includes advanced features, including dual-channel position measurement using non-contact magnetic technology, ensuring two independent outputs for enhanced precision. Multifaceted approach in the study encompasses hardware and software design, rigorous product validation and verification tests, and documentation. The hardware design involved creating a prototype and ensuring compliance with functional safety criteria, while the software design incorporated programmable functionalities using NI LabVIEW software. Through exhaustive validation and verification tests, including international standard-specified electrical and environmental assessments, accelerated life tests, and internal chip functionality examinations were *** observed in current sensors discussed, offering a system that not only meets functional safety standards but also aligns with the latest product development techniques. The anticipated benefits extend beyond technical advancements, as the product's resistance to external magnetic fields addresses emerging challenges in electric *** conclusion, it represents a significant step toward achieving cutting-edge technology through reliable development in industrial rotational position sensors. © 2024 IEEE.

关键词： Product design

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Case retrieval Strategy of Turning Process Based on Grey relational Analysis

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Computer Modeling in Engineering & Sciences 2024年第2期138卷 1663-1678页

作者： Jianfeng Zhao Yunliang Huo Ji Xiong Junbo Liu Zhixing Guo Qingxian Li School of Mechanical Engineering Sichuan UniversityChengdu610065China Sichuan Engineering Technology Research Center of Intelligent Design and Service for Cutting Tools Yibin R&D Park of Sichuan UniversityYibin644000China Department of R&D Pengxi Heye High-Tech Co.Ltd.Suining629000China

To solve the problem of long response time when users obtain suitable cutting parameters through the Internet based platform,a case-based reasoning framework is ***,a Hamming distance and Euclidean distance combined method is designed to measure the similarity of case features which have both numeric and category *** addition,AHP(Analytic Hierarchy Process)and entropy weight method are integrated to provide features weight,where both user preferences and comprehensive impact of the index have been *** relation analysis is used to obtain the similarity of a new problem and alternative ***,a platform is also developed on Visual Studio 2015,and a case study is demonstrated to verify the practicality and efficiency of the proposed *** method can obtain cutting parameters which is suitable without iterative *** with the traditional PSO(Particle swarm optimization algorithm)and GA(Genetic algorithm),it can obtain faster response *** method can provide ideas for selecting processing parameters in industrial *** guaranteeing the characteristic information is similar,this approach can select processing parameters which is the most appropriate for the production process and a lot of time can be saved.

关键词： CBr turning process grey relation AHP entropy weight

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Methods for improving HCI degradation in deep sub-micron processes

Methods for improving HCI degradation in deep sub-micron pro...

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2024 International Conference on Optoelectronic Materials and devices, ICOMd 2024

作者： Ma, Yaling Zhang, Song Liu, Qun Wang, dejin Zhou, Yaohui Li, Mincheng Process Integration Technology R&D Center China Resources Shanghua Technology Co. Ltd. Wuxi China

ISBN: (数字)9781510689046

ISBN: (纸本)9781510689039

The development of integrated circuits towards high performance and high integration is an inevitable trend, and the reliability issues brought about by this trend have become increasingly prominent as the electric field intensity and current density increase. With the continuous reduction in the characteristic size of Metal-Oxide-Semiconductor Field-Effect Transistors (MOSFETs), new mechanisms of Hot Carrier Injection (HCI) have emerged, seriously affecting the service life of the devices. This paper investigates the impact of HCI degradation on device lifetime by altering the CESL (Contact Etch Stop Layer) film in the device. By comparing the reliability assessment results of devices with SiON and SiN as the CESL films, it is confirmed that using SiON as the CESL film can enhance the device's lifespan. Both Pure 5V CMOS and LdMOS can pass process reliability assessments and meet industry standards. © 2025 SPIE.

关键词： MOS devices

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Memory-efficient and GPU-oriented visual anomaly detection with incremental dimension reduction

Memory-efficient and GPU-oriented visual anomaly detection w...

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2023 IEEE/CVF Conference on Computer Vision and Pattern recognition Workshops, CVPrW 2023

作者： Lee, Teng-Yok Nagai, Yusuke Minezawa, Akira Mitsubishi Electric Corporation Information Technology R&d Center Japan

ISBN: (纸本)9798350302493

recent studies show that the image features from pre-trained convolution neural network (CNN) can be used for anomaly detection, even without fine-tuning. A common type of methods divides the image space into patches, and estimates the distribution of CNN-based features per patch of all training data. While this types of methods can achieve high accuracies, the high dimensionality of CNN features causes overhead to both computing and storage. In this paper, we present an incremental algorithm to reduce the dimensionality of CNN features during the training. As our algorithm ultimately computes the Truncated PCA of the features, it only maintains the truncated singular values and vectors during the training. Besides, to efficiently update the truncated singular values/vectors of all patches, we further optimize the algorithm in order to fully utilize GPUs for parallel execution. We show that with our approach, we can achieve high accuracies on the texture classes of MVTec Ad with small memory footprint and extreme high speed (around 200FPS) on a single GPU. © 2023 IEEE.

关键词： Graphics processing unit

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ray Tracing Simulation in Wide Urban Areas by Combining Buildings

Ray Tracing Simulation in Wide Urban Areas by Combining Buil...

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2023 IEEE International Symposium on Antennas and Propagation, ISAP 2023

作者： Mamiya, Takuro Nakanishi, Takayuki Takikawa, Michio Nishioka, Yasuhiro Inasawa, Yoshio Information Technology R&D Center Mitsubishi Electric Corporation Japan

ISBN: (纸本)9798350341140

This paper studies the ray tracing simulation in a km-order urban area model. It is often difficult to calculate the massive model because of the calculation cost. In this paper, we propose a simple modeling method that combines several or many buildings into one block to decrease the elements of the analysis model. The height of each block is determined from area cumulative probability. The best result of comparison between measurements and simulations shows rMSE of 6.73dB. © 2023 IEEE.

关键词： combining-buildings measurements propagation ray-tracing simulation wide-urban-area

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Latest Technological Progress in drilling and Completion Operations of the Unconventional reservoir in Xinjiang MaHu Oil Field and Key Suggestions for the Next Steps

Latest Technological Progress in Drilling and Completion Ope...

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2025 International Petroleum technology Conference, IPTC 2025

作者： Hu, Huaigang Xi, Chuanming Ji, Guodong Zhang, Nan Wu, Qiang Zhuo, Lubin Zou, Lingzhan CNPC Engineering Technology R&D Company Limited Beijing China National Engineering Research Center for Oil Gas Drilling and Completion Technology Beijing China Xinjiang Oilfield Engineering Technology R&D Company Limited Karamay China

ISBN: (纸本)9781959025436

due to the differences in sedimentary environments, compared with the exploitation of unconventional oil and gas resources in the United States and other countries, China has encountered greater difficulties in the drilling and completion processes of unconventional oil and gas. By analyzing the problems faced by drilling and completion in unconventional reservoirs in the MaHu area in recent years, the process of solving the issues and technical progress are summarized to form a technical template for drilling and completion in this area, which can also provide references for the next step to improve the drilling efficiency and reduce development costs. By studying the lateral distribution law of the pore pressure, the placement of the technical casing was optimized to further develop a standard design for the wellbore structure applicable to this area. To adapt to the local environmental protection requirements, high-performance non-sulfonic treatment agents were selected to replace sulfonic treatment agents, and four sets of environmental protection drilling fluid systems were formed. Based on the rock mechanics and field tests, the personalized drill bit is continuously optimized. With the introduction of a rotary steering drilling system and high-performance positive displacement motor (PdM), the rate of penetration (rOP) has been greatly improved. The transformation of horizontal Wells in the target Triassic formation from four types of casing strings with open hole completion + White oil-based/potassium-calcium based polysulfone organic salt drilling fluid to three types of casing strings with 5-inch casing completion + white-oil/potassium-calcium polyamine organic salt drilling fluid, from conventional rotary drilling + roller cone bit to rotary steering system/high-performance PdM +PdC bit, and the horizontal section length increased from 2000m to 2650m. Completion time decreased from an average of 144 days to 72 days. Speak of the Permian formation, the tra

关键词： Oil well completion

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