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Recent advances in photopolymerization 3D printing of alumina-ceramic

Progress in Natural Science:Materials International 2025年第1期35卷 1-30页

作者： M.Irfan Hussain Min Xia XiaoNa Ren Zhen Shen Muhammad Jamil Changchun Ge Institute of Powder Metallurgy and Advanced Ceramics School of Material Science and Engineering University of Science and Technology Beijing State Key Laboratory of Multimodal Artificial Intelligence Systems Beijing Engineering Research Center of Intelligent Systems and Technology Institute of AutomationChinese Academy of Sciences College of Mechanical and Electrical Engineering Nanjing University of Aeronautics and Astronautics

Digital light processing(DLP) 3D printing has a huge potential for manufacturing intricate and customized ceramic parts with high precision and cost-effectiveness. research in this field contributes to material innovation,opening the avenues for new process designs in both scientific and industrial sectors. However, the implementation of DLP 3D printing technology in ceramic research has not yet reached the maturity level as that in polymer and tissue engineering. Necessarily, a holistic in-depth literature reporting the successful integration of alumina ceramics within DLP 3D printing technology is urgently needed. This review, systematic examines recent progress in DLP technology, focusing on photopolymer resins that incorporate UV-sensitive monomers, photoinitiators, and dispersants, as well as their synergistic effects on achieving high-quality printing, desirable material properties, and enhanced performance. Further, the review discusses key factors including post-processing characteristics such as debinding and sintering, which influence microstructure, and defect formation including microcracks, porosity and voids. Finally, the challenges associated with printing and sintering are highlighted,aiming to identify focused focused development pathways and potential solution to optimize outcomes. This analysis clarifies existing challenges and also propsoes future applications for DLP technology in the aluminaceramic field.

关键词： Al2O3 ceramics Applications Digital light processing (DLP) Post-processing Resin

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Improving Pretrained YAMNet for Enhanced Speech Command Detection via Transfer Learning

Improving Pretrained YAMNet for Enhanced Speech Command Dete...

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2024 International Conference on Telecommunications and Intelligent systems, ICTIS 2024

作者： Lachenani, Sidahmed Kheddar, Hamza Ouldzmirli, Mohamed University of Medea Research Laboratory in Advanced Electronics Systems LSEA Department of Electrical Engineering Medea Algeria

ISBN: (纸本)9798331527396

This work addresses the need for enhanced accuracy and efficiency in speech command recognition systems, a critical component for improving user interaction in various smart applications. Leveraging the robust pretrained YAMNet model and transfer learning, this study develops a method that significantly improves speech command recognition. We adapt and train a YAMNet deep learning model to effectively detect and interpret speech commands from audio signals. Using the extensively annotated Speech Commands dataset (speech_commands_v0.01), our approach demonstrates the practical application of transfer learning to accurately recognize a predefined set of speech commands. The dataset is meticulously augmented, and features are strategically extracted to boost model performance. As a result, the final model achieved a recognition accuracy of 95.28%, underscoring the impact of advanced machine learning techniques on speech command *** achievement marks substantial progress in audio processing technologies and establishes a new benchmark for future research in the field. © 2024 IEEE.

关键词： Transfer learning

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Comparison of Satellite Attitude Dispersion due to Stochastic Errors from MEMS based Gyroscopes 20

Comparison of Satellite Attitude Dispersion due to Stochasti...

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20th IEEE India Council International Conference, INDICON 2023

作者： Austin, S.S. Dathan, Nisha S Sreeja, S. College of Engineering Electrical and Electronics Engineering Kerala Trivandrum India Isro Inertial Systems Unit Advanced Inertial Systems Kerala India

ISBN: (纸本)9798350305593

Inertial measurement units are the most commonly used and the most reliable sensors for the purpose of navigation. However, a critical limitation of such sensors is the accumulation of errors over time. This paper compares the various stochastic error sources in a typical MEMS gyroscope. An inertial propagation algorithm is employed to compute the attitude of the satellite from sensor data. Allan Variance studies are done to analyze various error sources and their corresponding frequency characteristics which are dominant in pose estimation. Monte Carlo simulations are performed to study the maximum deviation in the attitude estimation of the satellite. Knowledge of possible angular deviation per unit time evolution is necessary to estimate the extent of attitude reinforcement required from auxiliary sensors *** results are expected to aid in the design of attitude estimation filters that uses inputs from auxiliary sensors. This may include star sensors for conventional satellites in orbit or relative navigation sensors like LIDAR and vision sensors for on-orbit servicing. © 2023 IEEE.

关键词： Allan variance Inertial Measurement unit MEMS gyroscope Monte Carlo Navigation Noise

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Neural Network-Integrated Multistatic Sensing for Joint Angle Estimation in Cell-Free JCAS systems 5

Neural Network-Integrated Multistatic Sensing for Joint Angl...

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5th IEEE International Symposium on Joint Communications and Sensing, JC and S 2025

作者： Ayten, Fatih Ilter, Mehmet C. Jain, Akshay Lohan, Elena Simona Valkama, Mikko Tampere University Electrical Engineering Unit Wireless Research Center Finland Radio Systems Research Nokia Bell Labs Espoo Finland

ISBN: (纸本)9798331531652

Cell-free (CF) systems play a pivotal role in the evolution of next-generation wireless networks, as they improve spectral efficiency and coverage by eliminating the need for traditional cell boundaries. However, these systems encounter significant challenges, such as high computational complexity, scalability issues, and constraints on real-time decision-making. Meanwhile, the joint communication and sensing (JCAS) concept in wireless systems provides a framework that leverages communication signals not only for data transmission but also for accurate environmental sensing, thereby maximizing the utility of available resources. In this paper, we propose a neural network (NN)-based framework to estimate the joint angle-of-arrival (AoA)/angle-of-departure (AoD) resulting from available targets in a CF system after exploiting the communication waveforms generated by the access points (APs). In the simulation results, we first demonstrate that our proposed NN mechanism achieves comparable performance to the maximum likelihood estimation (MLE), and then show that the results are promising, proving the NN's ability to capture complex, non-linear relations between the angle values and channel estimations across a range of received signal qualities after testing with varying numbers of APs and targets. © 2025 IEEE.

关键词： Ability testing

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Self-Powered End-to-End Wireless Sensor Network for Geophysical Explorations

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IEEE systems Journal 2025年第1期19卷 107-118页

作者： Rojas, Jhonathan Prieto Almazyad, Rayan Al Hayyah, Abdulaziz Alruhaiman, Ahmed Almusharraf, Mohammed Al-Dharrab, Suhail Attia, Hussein Department of Electrical Engineering Dhahran31261 Saudi Arabia Interdisciplinary Research Center of Advanced Materials KFUPM Dhahran31261 Saudi Arabia King Fahd University of Petroleum and Minerals Department of Electrical Engineering Dhahran31261 Saudi Arabia Interdisciplinary Research Center for Communication Systems and Sensing KFUPM Dhahran31261 Saudi Arabia

The underground layers of the Earth contain immense resources that require geophysical surveys. This article presents an end-to-end, self-powered wireless sensor network (WSN) for geophysical surveys. The WSN conducts geophysical surveys in an energy-efficient, portable manner. It includes a sensing element, advanced electronics, data processing and digitization, and wireless transmission with networking capabilities between sensing nodes. The system is equipped with a power management module with solar-powered charging capabilities, allowing for at least six days of effective operation on a few hours' worth of charge. The electronic circuitry performing amplification and filtering provides cut-off frequencies of 8.2–108 Hz, and the sensor node exhibits a sampling frequency of 600 SPS. Furthermore, the system implements power modes (active/sleep) to reduce power consumption, with a nominal power usage of only 650 mW at its maximum. The WSN comprises a multihop implementation with smart routing to ensure power-efficient and reliable data transmission. In addition, message encryption is implemented for enhanced wireless security. A field test was conducted to validate the proposed geophysical data acquisition system. Geophysical signals were detected and wirelessly transmitted over a 200 m2 area employing a network of six nodes to a storage unit, where they were successfully reconstructed and remained stored for later processing and analysis. © 2007-2012 IEEE.

关键词： Data acquisition

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Bidirectional Polarization-Multiplexing Fiber Laser Enabling Tunable-Repetition-Rate Dual Combs 8

Bidirectional Polarization-Multiplexing Fiber Laser Enabling...

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8th Optoelectronics Global Conference, OGC 2023

作者： Liu, Bowen Dai, Maolin Shirahata, Takuma Yamashita, Shinji Set, Sze Yun The University of Tokyo Research Center for Advanced Science and Technology Department of Electrical Engineering and Information Systems Tokyo Japan The University of Tokyo Department of Electrical Engineering and Information Systems Tokyo Japan The University of Tokyo Research Center for Advanced Science and Technology Tokyo Japan

ISBN: (纸本)9798350325324

Ultrafast laser is an ideal playground for the study of precise spectroscopy and microscopy that heavily rely on the high-performance optical frequency combs, which is the unique nature of mode-locked fiber lasers. In particular, dual-comb fiber lasers can greatly improve system performance while reducing complexity by developing self-referencing combs and coupling pulse trains with different repetition rates. Whereas the repetition rate is generally determined for a certain lasing resonator, which creates additional constraints in dual-comb applications. Here, we developed a bidirectional polarization-maintaining fiber laser, where the repetition rate of mode-locked pulse trains can be tuned continuously inside the cavity. The proposed laser outputs mutually orthogonal polarization states in opposite directions, and the maximum tuning range of the repetition rate reaches 681.6 kHz. Compared with referencing CW loop, the RF difference reaches 978.2 kHz, almost equal to 1 MHz. Meanwhile, the two directions generate pulses with nearly the same central wavelength, enabling excellent capacity in self-referencing dual-comb generation. This tunable-repetition-rate dual-comb source is promising for two-photon fluorescence microscopy, precise metrology of wavelength and synchronization of other combs based on fiber lasers with different repetition rate, etc. © 2023 IEEE.

关键词： Fiber lasers

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Quantifying, Activating and Rewarding Flexibility in Renewable Energy Communities

Quantifying, Activating and Rewarding Flexibility in Renewab...

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2024 IEEE PES Innovative Smart Grid Technologies Europe Conference, ISGT EUROPE 2024

作者： Allard, Julien Vallée, François De Grève, Zacharie Stegen, Thomas Glavic, Mevludin Cornélusse, Bertrand University of Mons Power Systems and Markets Research Group Electrical Power Engineering Unit Mons Belgium University of Liège Department of Electrical Engineering and Computer Science Liège Belgium

ISBN: (纸本)9789531842976

Demand-side flexibility from renewable energy community members increases the benefits of local production and exchanges. To effectively harness this flexibility, end-users must be rewarded for their efforts regarding the shifted energy volumes and the associated discomfort. This work quantifies these last two quantities for three types of loads (electric vehicles, thermal loads and wet appliances). Then, a two-step model is proposed which first optimally activates the offered flexibility and then shares the benefits of this activation among the renewable energy community members through a rule-based or an optimization-based approach. Results show that the community framework can further increase the benefits brought by flexible demand. © 2024 IEEE.

关键词： Demand response

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Design and Analysis of an Axial Flux Switching DC Excited Machine by Additive Manufacturing 26

Design and Analysis of an Axial Flux Switching DC Excited Ma...

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26th International Conference on electrical Machines and systems, ICEMS 2023

作者： Moradi, Mehdi Khan, Azeem University of Cape Town Advanced Machines and Energy Systems Research Group Department of Electrical Engineering Cape Town South Africa

ISBN: (纸本)9798350317589

The axial flux switching machine (AFSM) has garnered attention due to its notable features such as high efficiency, high power density, and compactness. As the demand for higher efficiency and higher power density continues to rise, motor designs are evolving. One effective approach involves utilizing high fill factor windings, resulting in reduced total winding resistance, more compact packaging, and minimized copper loss. These improvements contribute to higher power density and higher efficiency in the motor. Additive manufacturing (AM) has the potential to enhance the fill factor of electrical machines, offering a compelling technology capable of producing intricate shapes beyond the capabilities of conventional manufacturing methods. This paper simulates the AM method through finite element (FE) analysis to achieve higher fill factor windings. This aims to enhance the performance of the axial flux switching DC excited machine (AFSDCEM). To ensure a fair comparison, the analysis evaluates and contrasts the electromagnetic performance of a traditional AFSDCEM with an AM-based AFSDCEM that shares an identical geometry. © 2023 IEEE.

关键词： Efficiency

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Metasurfaces for next-generation wireless communication systems

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National Science Review 2023年第8期10卷 17-19页

作者： Younes Ra'di Nikita Nefedkin Petar Popovski Andrea Alù Department of Electrical Engineering and Computer Science Syracuse University Photonics Initiative Advanced Science Research Center City University of New York Department of Electronic Systems Aalborg University Physics Program Graduate Center City University of New York

The pace of development in the world of 5G communication systems has proven to be much more demanding than previous generations, with 5G-advanced seemingly around the corner [1]. Extensive research is already underway to structure the next generation of wireless systems(i.e. 6G), which may potentially enable an unprecedented level of human–machine interaction [2].

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Robust Wireless Power Transfer by Self-Oscillating Controlled Inverter and Circular Pads 3

Robust Wireless Power Transfer by Self-Oscillating Controlle...

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3rd International Conference on electrical Machines and Drives, ICEMD 2023

作者： Eikani, Alireza Amirkhani, Mohammad Jafari, Hossein Vaez-Zadeh, Sadegh Mirsalim, Mojtaba Khaburi, Davood Arab University of Tehran Advanced Motion Systems Research Lab School of Electrical and Computer Engineering College of Engineering Tehran Iran Department of Electrical Engineering Tehran Iran Iran University of Science and Technology Department of Electrical Engineering Tehran Iran

ISBN: (纸本)9798350393743

Inductive wireless power transfer (WPT) faces significant challenges in achieving high efficiency and stable output power for charging mobile devices like EVs. Using circular pads (CP) as the transmitter (Tx) and receiver (Rx) and a self-oscillating controlled inverter, this paper demonstrates a robust WPT system that maintains high constant transfer efficiency and output power in a defined region regardless of coupling coefficient variations without communication between Tx and Rx or control circuits for the receiver side. In contrast to couplers with non-identical Tx and Rx pads and multiple decoupled coils in the Rx pad, the compact CP-CP magnetic coupler with a single identical coil on the Tx and Rx is more robust at a wider transfer distance (air gap) and lateral and rotational misalignment between the Tx and Rx. The proposed 1-kW robust WPT system with up to a 20 cm air gap between the Tx and Rx and up to 12 cm lateral misalignment in all directions at a 15 cm air gap and all degrees of rotational misalignment can tolerate coupling variations and achieve constant output power with 93% constant transfer efficiency. © 2023 IEEE.

关键词： Energy transfer

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