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14th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2025

作者： Yang, Xin Shi, Guannan Jin, Liyang Qin, Yuan Porter, Matthew Chang, Che-Wei Jia, Xiaoting Dong, Dong Shao, Linbo Zhang, Yuhao Blacksburg United States Virginia Tech Bradley Department of Electrical and Computer Engineering Blacksburg United States The University of Hong Kong Department of Electrical and Electronic Engineering Hong Kong

ISBN: (纸本)9798331516116

optically-controlled high-voltage power devices hold good promise for grid and renewable energy applications by providing superior electromagnetic interference (EMI) immunity and reduced switching delay. This paper proposed a novel optically-controlled gate driver architecture that applies complementary optical signals to two photodiodes (PDs) arranged in a totem-pole configuration. This configuration enables fast switching of power semiconductor devices using minimal optical power, as only low-power driver signals are optically modulated and device main current is not photogenerated. To validate this approach, we employ two InGaAs PDs to drive a 3.3 kv SiC MOSFET, the highest-voltage industrial unipolar device currently available. When each PD is illuminated by 21.7 mW optical power, the SiC MOSFET achieves hard-switching at 1500v/3A, with rise and fall times of 152 ns and 214 ns, respectively. These results set new records for switching voltage, speed, and power capacity-to-optical power ratio in optically-controlled unipolar power switches. This general optical driver design is also applicable to the future development of integrated optics for power electronics in diverse (ultra-) wide-bandgap semiconductors.1 © 2025 IEEE.

关键词： Silicon carbide

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Microstructure and mechanical characterization of weldments of titanium alloy plates joined using different welding techniques

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Interactions 2024年第1期245卷 1-12页

作者： Perumal, G. vasanthkumar, P. Dhinakarraj, C.K. Srinivasan, D. Kavitha, S. V.R.S. College of Engineering and Technology Tamil Nadu Arasur Villupuram607107 India SRM Institute of Science and Technology Tamil Nadu Ramapuram Chennai600089 India Adhiparasakthi Engineering College Tamil Nadu Melmaruvathur603319 India Loyola Institute of Technology Tamil Nadu Chennai600123 India Kalasalingam Academy of Research and Education Tamil Nadu Krishnankoil626126 India

In the welding of materials, metal inert gas (MIG), gas tungsten arc welding (GTAW), and tungsten inert gas (TIG), are typical welding technologies. Welding titanium alloys involves several challenges due to their susceptibility to oxidation phenomena. Shielding arrangements of a relatively new type are tested to overcome this contamination. A proposed design and configurations are used to join commercially pure titanium sheets with variations in ARC, GMAW, and GTAW process parameters along with travel speed and welding current. variations were made to process parameters toward full penetration butt joints in experimental bead-on plate (BoP) trials with a sheet thickness of 5 mm. Macrostructure images were subsequently captured. Analysing the microstructure of the heat-affected zone, base metal, and fusion zone is done using optical microscopy. TIG welding is 7.39% harder than MIG welding and 2.72% harder than Arc welding. A TIG welding joint exhibited 11% greater tensile strength than a GTAW joint, while a MIG welding joint possessed 6.7% greater tensile strength than a TIG joint. A TIG welding process elongates 15.5% more than a MIG welding process, and 3.31% more than an arc welding process. Titanium alloy plates are best joined by TIG welding because of its microstructure and mechanical properties. For aerospace and high-performance engineering parts, TIG welding offers excellent results due to the precise control of welding parameters. © The Author(s), under exclusive licence to Springer Nature Switzerland AG 2024.

关键词： Tensile strength

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Imager performance assessment with TRM4: recent developments 34

Imager performance assessment with TRM4: recent developments

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Conference on Infrared Imaging Systems - design, Analysis, Modeling, and Testing XXXIv

作者： Perez, Jose Steiner, Dov Assaban, Dan An, Margarita Kessler, Stefan Fraunhofer IOSB Fraunhofer Inst Optron Syst Technol & Image Explo Ettlingen Germany IARD Sensing Solut Ltd IL-30065 Kibbutz Yagur Israel Israel Minist Def Tel Aviv Israel

ISBN: (纸本)9781510661806;9781510661813

Model-based performance assessment is an important tool in the design of electro-optical and infrared imagers and their performance comparison. It alleviates the need for expensive field measurements and can be used for parameter trade studies. TRM4 serves this purpose and features a validated approach to consider aliasing in the range performance assessment of focal plane arrays. TRM4.v3 was released in October 2021 and came with a set of new model features. One of the new capabilities is the performance assessment of imagers used for aerial imaging by computing the National Imagery Interpretability Rating Scale (NIIRS) as performance measure. The NIIRS values are calculated in TRM4 using the latest version of the General Image Quality Equation. In this paper, the result of a recent validation effort for the NIIRS calculation is reported. current TRM4 development focusses on performance modeling of subpixel target scenarios and color cameras. For subpixel targets, the calculation of the signal-to-noise ratio (SNR) for the additional target signal is presented considering different target locations with respect to the detector matrix. Best-case and worst-case detection ranges are derived from specified threshold SNRs of detection algorithms. First results are shown using the TRM4.v3 sky background scenario feature to model ground-to-air imaging of flying targets. A first step for modeling color cameras is the extension of AMOP (Average Modulation at Optimum Phase) calculation, which is used in TRM4 to describe the spatial signal transfer characteristics along the imaging chain. It is shown how the sampling by sensors with Bayer filter and demosaicing can be included into the AMOP calculation procedure.

关键词： electro-optical system performance range performance model performance assessment color camera subpixel targets NIIRS

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Realization of flexible in-memory computing in a van der Waals ferroelectric heterostructure tri-gate transistor

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Nano Research 2024年第3期17卷 1886-1892页

作者： Xinzhu Gao Quan Chen Qinggang Qin Liang Li Meizhuang Liu Derek Hao Junjie Li Jingbo Li Zhongchang Wang Zuxin Chen School of Semiconductor Science and Technology South China Normal UniversityFoshan 528225China Guangdong Provincial Key Laboratory of Chip and Integration Technology Guangzhou 510631China Institute of Solid State Physics Hefei Institutes of Physical Science Chinese Academy of SciencesHefei 230601China School of Science STEM CollegeRMIT UniversityMelbourne 3000Australia CAS Key Laboratory of Functional Materials and Devices for Special Environments Xinjiang Technical Institute of Physics&ChemistryChinese Academy of SciencesUrumqi 830011China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China College of Optical Science and Engineering Zhejiang UniversityHangzhou 310027China International Iberian Nanotechnology Laboratory(INL) Av.Mestre Jose Veiga s/nBraga 4715-330Portugal

Combining logical function and memory characteristics of transistors is an ideal strategy for enhancing computational efficiency of transistor ***,we rationally design a tri-gate two-dimensional(2D)ferroelectric van der Waals heterostructures device based on copper indium thiophosphate(CuInP_(2)S_(6))and few layers tungsten disulfide(WS_(2)),and demonstrate its multi-functional applications in multi-valued state of data,non-volatile storage,and logic *** co-regulating the input signals across the tri-gate,we show that the device can switch functions flexibly at a low supply voltage of 6 v,giving rise to an ultra-high current switching ratio of 107 and a low subthreshold swing of 53.9 mv/*** findings offer perspectives in designing smart 2D devices with excellent functions based on ferroelectric van der Waals heterostructures.

关键词： two-dimensional(2D)ferroelectric heterostructure tri-gate polymorphic regulation in-memory computing

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design of Fuzzy Logic Controller For Solar Powered Electric vehicle

Design of Fuzzy Logic Controller For Solar Powered Electric ...

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2022 International Conference on Emerging Materials for Technological Applications, ICEMTA 2022

作者： Yekambareswari, Bhogireddy Kumar, G.v. Nagesh Yamuna, P. Sateesh Satyanarayana, v.S.v. Sudha, v. Naga JNTUA College of Engineering Andra Pradesh Pulivendula India Vignan’s Institute of Information Technology Visakhapatnam India

ISBN: (纸本)9781510667648

In this paper, an Ev battery-based energy storage microgrid is controlled by the fuzzy logic controller, which we use as the backbone of an intelligent energy management system (EMS). Plug-in electric vehicles (Evs) can join the microgrid via a DC rapid charging station. Fuzzy logic controllers are used for each Ev's estimated departure time, battery charge level, and rated capacity to calculate how much power of each Ev can provide tov2G (vehicle-to-grid) and G2v (grid-to-vehicle) services. An array of solar panels and a battery attached to the Microgridthrough a bidirectional dime converter and a boost converter are the core components of the PvDCM. Both positive and negative currents can move from the power source tothe load whether the Pv panels are set up for Maximum power point tracking (MPPT) or maximum voltage operation. To maximize efficiency in the faceof high input current and low input voltage, a new design for a solar the DC/DC converter is givenin this paper. However, thehigh DC/DC converter output power means that a big value of the input current is to be expected, which will possess adetrimental impact on the circuit design and the system's stability. In addition to being able to accept a wide variety of input voltage while maintaining a constant output voltage, the DC/DC converter is protecting the battery from being exposed to an output current, and improves the battery's useful life. Inverter current must be tracked and converted from abc to dq0 for this method to work (Clarke and Park transformation). Here the, two orthogonal phase variables for a Fuzzy controller are carried out by the Park transformation (DQ) on a single-phase inverter. © 2023 SPIE.

关键词： Solar panels

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Grazing incidence X-ray optics in the Czech Republic: past, present, future 8

Grazing incidence X-ray optics in the Czech Republic: past, ...

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EUv and X-ray Optics: Synergy between Laboratory and Space vIII 2023

作者： Hudec, R. Czech Technical University in Prague Faculty of Electrical Engineering Prague Czech Republic Astronomical Institute Czech Academy of Sciences AV CR Ondrejov Czech Republic

ISBN: (纸本)9781510662728

I give a short overview of astronomical X-ray optics covering the past, recent, and future developments with an emphasis on grazing incidence optics and on developments in the Czech Republic. There is a long history in the X-ray optics development in the Czech Republic - the first X-ray mirror was produced in 1969. The first Czech X-ray mirror (50 mm Wolter for solar imaging) was flown to space onboard the vertikal 8 rocket in 1979 as part of a photographic solar X-ray telescope in collaboration with Polish institutes. The recent developments focus on new technologies based on novel lightweight materials such as slumped glass foils and Silicon wafers and also on novel designs and arrangements such as wide-field Lobster Eye X-ray optics. © 2023 SPIE.

关键词： X ray optics

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design and Evaluation of optical Wireless Communication Systems for Underwater IoT Applications 11

Design and Evaluation of Optical Wireless Communication Syst...

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11th International Conference on Wireless Networks and Mobile Communications (WINCOM) - Inclusive and Intelligent Connectivity

作者： viratikul, Rungrat Boonlom, Kamol Robertson, Ian Amsdon, Tim Janpugdee, Panuwat Somjit, Nutapong Chulalongkorn Univ Fac Engn Dept Elect Engn Bangkok Thailand Univ Leeds Sch Elect & Elect Engn Leeds W Yorkshire England

ISBN: (纸本)9798350377873;9798350377866

This paper investigated the deployment of optical Wireless Internet of Things (OWIoT) systems within underwater environments, addressing the significant challenges faced by RF communication, including signal attenuation and interference. The advantages of optical wireless communication, such as higher bandwidth and enhanced security, were highlighted as particularly suitable for aquatic conditions. Through simulations conducted using Ansys Zemax software, LEDs operating at a 625 nm wavelength were identified as optimal, demonstrating a potential frequency bandwidth of 10.52 MHz at a bias current of 150 mA. This configuration was found to optimize signal integrity and extend communication range underwater. Subsequent experimental validation confirmed the simulated performance, with consistent data transmission over a 1000 mm underwater path and minimal signal degradation being achieved. The integration of simulation insights with empirical evidence was shown to solidify the foundation for advancing OWIoT technologies, offering a robust solution for underwater data communication and marking a significant advancement in overcoming the barriers of underwater IoT deployments.

关键词： optical Wireless Underwater Wireless IoT Applications LED optical Transmission styling LED Transmission

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Bithieno[3,4-c]pyrrole-4,6-dione-Based Wide-Bandgap Donor Polymers for Efficient Polymer Solar Cells

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MACROMOLECULAR RAPID COMMUNICATIONS 2025年第1期46卷 e2400603页

作者： Jiang, Yu Yuan, Hua Pan, Hui Zhang, Guangjun Hunan Univ Sci & Technol Minist Educ Sch Chem & Chem Engn Key Lab Theoret Organ Chem & Funct Mol Xiangtan 411201 Peoples R China

The polymer solar cells (PSCs) have garnered substantial interest owing to their lightweight, cost-effectiveness, and flexibility, making them ideal for large-scale roll-to-roll manufacturing. In this study, two wide-bandgap (WBG) donor polymers, PFBiTPD and PClBiTPD, utilizing bithieno[3,4-c]pyrrole-4,6-dione (BiTPD) as the electron-accepting unit and fluorinated/chlorinated benzo[1,2-b:4,5-b']dithiophene (BDT) as the electron-donating moiety are designed and synthesized. The polymers demonstrated large optical bandgaps (exceeding 1.80 ev) and are blended with ITIC-4F to form the active layers in PSCs. The PFBiTPD-based devices showed a well-dispersed fibrillar network, facilitating efficient charge generation and transport. Thus, these devices attained a power conversion efficiency (PCE) of 8.60%, featuring a fill factor (FF) of 62.89%, an open-circuit voltage (voc) of 0.88 v and a short-circuit current density (Jsc) of 15.54 mA cm-2. In contrast, PClBiTPD-based devices displayed lower performance due to less favorable morphology. The study underscores the importance of polymer design and morphology control in optimizing the photovoltaic performance of PSCs. The combination of fluorinated benzo[1,2-b:4,5-b']dithiophene (BDT) as donor unit and bithieno[3,4-c]pyrrole-4,6-dione (BiTPD) as acceptor unit can realize a wide-bandgap donor polymer, which realizes the complementary absorption with narrow bandgap acceptor ITIC-4F, achieving a high-power conversion efficiency (PCE) of 8.60% in binary blend device. image

关键词： molecular engineering morphology performance polymer solar cells wide-bandgap

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A Review on Application of Soft Computing Techniques in Geotechnical engineering 5th

A Review on Application of Soft Computing Techniques in Geot...

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5th International Conference on Advances in Civil and Ecological engineering Research, ACEER 2023

作者： Nagaraju, T.v. Sireesha, Mantena Sunil, B.M. Alisha, Shaik Subhan Department of Civil Engineering S.R.K.R. Engineering College Bhimavaram India Department of Geo-Engineering Andhra University Visakhapatnam India Department of Civil Engineering National Institute of Technology Karnataka India Department of Civil Engineering Vishnu Institute of Technology Bhimavaram India

ISBN: (纸本)9789819957156

Numerous test results, mathematical relationships, and in-the-moment analysis and design are all components of geotechnical issues. Additionally, due to smart infrastructure and materials, the research trend in engineering nowadays is shifting toward intelligent tools and their ability to tackle engineering problems. Artificial neural networks (ANN), support vector machines (SvM), genetic algorithms (GA), and particle swarm optimization algorithms (PSO), among other soft computing techniques, have made significant progress in recent years in solving geotechnical issues. Based on a review of more than 800 published research, this study discusses the applicability of soft computing techniques in the current environment. Traditional methods, such as regression analysis and trial-and-error techniques, take time and could be more effective. Additionally, most geotechnical designs require considerable experimental data and may require laborious work. A novel methodology for soft computing approaches has emerged to solve the problems mentioned above. This paper presents soil problems and geotechnical challenges while examining recent developments and the potential applications of soft computing. © 2024, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Soft computing

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Surface integrity of ball burnished bioresorbable magnesium alloy

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Advances in Manufacturing 2023年第2期11卷 342-362页

作者： G.v.Jagadeesh Srinivasu Gangi Setti Department of Mechanical Engineering National Institute of Technology RaipurChhattisgarh492010India

Magnesium alloys are potential biodegradable and biocompatible implant materials because of their excellent biological properties. Recently, interest in these alloys as a promising alternative for temporary orthopedic implants has grown owing to their desirable biological, mechanical, and physical properties. However, the application of magnesium alloys is hindered by their rapid degradation and low corrosion resistance in physiological fluids, leading to the failure of implants. Thus, the current challenge is to enhance the corrosion resistance and control the degradation rate of magnesium under physiological conditions. The rapid degradation of magnesium alloys can be controlled by improving their surface integrity, such as surface roughness and microhardness. The present study aims to improve the surface integrity of the Mg Ze41A alloy by the ball burnishing technique. The surface roughness improved by 94.90% from 0.941 μm to 0.048 μm with a burnishing force of 50 N, burnishing speed of 1 300 r/min, burnishing feed of 130 mm/min, and three passes. Similarly, the microhardness improved by 50.62% from 75.2 Hv to 113.27 Hv with a burnishing force of 60 N, burnishing speed of 1 100 r/min, burnishing feed of 100 mm/min, and five passes. The variations in microhardness, which were observed up to 400 μm beneath the surface, exhibited a linear nature. These variations may be attributed to the movement of dislocations, formation of new dislocations, nanocrystal structures, metastable phases and subgrains, and lattice distortion or grain refinement. The surface features obtained from optical images demonstrated the fundamental mechanisms involved in the ball burnishing process. The concept of burnishing maps and zones will assist in the design of the ball burnishing parameters of a material with an equivalent yield strength of 140 MPa. The significant improvement in the surface integrity of the Mg Ze41A alloy by the ball burnishing technique is expected to improve its func

关键词： Magnesium alloy Bioresorbable Orthopedic implants Surface integrity Ball burnishing

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