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materials Design for Charge-programmed Additive Manufacturing of Antennas

Materials Design for Charge-Programmed Additive Manufacturin...

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2023 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio science Meeting, AP-S/URSI 2023

作者： Wang, Zhen Xu, Zhenpeng Wang, Junbo Hensleigh, Ryan Rahmat-Samii, Yahya Zheng, Xiaoyu Rayne University of California Department of Materials Science & Engineering BerkeleyCA94720 United States University of California Department of Electrical and Computer Engineering Los AngelesCA90095 United States University of California Department of Civil and Environmental Engineering Los AngelesCA90095 United States

ISBN: (纸本)9781665442282

Antennas fabricated with traditional manufacturing methods typically carry redundant weight and are limited in 3D architecture complexity. Current additive manufacturing (AM) methods also lacks the capability to construct antennas with multiple materials. The charge-programmed multi-material AM process demonstrated in this work allows the design and manufacturing of antennas with previously unattainable mechanical properties. In this paper, we discuss the principles behind the multi-material printing and the versatility of the selective metal deposition process. We also introduce the material designs that enables the variation of material property, which makes it possible to print both stiff and flexible antennas. © 2023 IEEE.

关键词： Antennas

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Synthetic Batik Pattern Generator Using Wasserstein Generative Adversarial Network with Gradient Penalty 6

Synthetic Batik Pattern Generator Using Wasserstein Generati...

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6th International Seminar on Research of Information Technology and Intelligent Systems, ISRITI 2023

作者： Andriadi, Kus Heryadi, Yaya Lukas Suparta, Wayan Sonata, Ilvico Binus Graduate Program Doctor of Computer Science Bina Nusantara University Computer Science Department Jakarta Indonesia Jakarta12930 Indonesia Institut Teknologi Nasional Faculty of Industrial Technology Department of Electrical Engineering Yogyakarta Yogyakarta55281 Indonesia

ISBN: (纸本)9798350358346

Batik is an Indonesian world cultural heritage. Batik consists of many kinds of patterns depending on where the batik comes from, Batik-making techniques continue to develop along with technology development. Among the batik making techniques that are widely used are hand-written, stamping, and printing. Batik motifs have been widely used as research material, especially in the field of artificial intelligence. The diverse appearance of batik motifs has attracted many researchers to carry out research on making synthetic batik patterns, one of which uses a Generative Adversarial Network. This paper presents a synthetic batik pattern model based on the Wasserstein Generative Adversarial Network with Gradient Penalty. This model has been proven to create new synthetic batik patterns quite well and almost identical with images provided in the dataset, with the notes if the dataset provided is large. © 2023 IEEE.

关键词： Generative adversarial networks

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Anisotropic and Nonlinear Optical Properties of 2D Transition Metal Carbides and Nitrides (MXenes)

Anisotropic and Nonlinear Optical Properties of 2D Transitio...

引用

CLEO: science and Innovations in CLEO 2024, CLEO: S and I 2024 - Part of Conference on Lasers and Electro-Optics

作者： Simon, Jeffrey Reigle, Benjamin Fruhling, Colton Zhang, Danzhen Ippolito, Stefano Kim, Hyunho Shalaev, Vladimir Gogotsi, Yury Boltasseva, Alexandra Elmore Family School of Electrical and Computer Engineering Birck Nanotechnology Center Purdue University West LafayetteIN47907 United States A. J. Drexel Nanomaterials Institute Department of Materials Science and Engineering Drexel University PhiladelphiaPA19104 United States

We report the experimentally retrieved anisotropic optical permittivity of several MXenes which indicate that these materials exhibit a hyperbolic dispersion relationship. Additionally, we describe the thickness dependencies of both linear and nonlinear properties of these MXenes. © Optica Publishing Group 2024

关键词： Optical depth

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Anisotropic and Nonlinear Optical Properties of 2D Transition Metal Carbides and Nitrides (MXenes)

Anisotropic and Nonlinear Optical Properties of 2D Transitio...

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2024 Conference on Lasers and Electro-Optics, CLEO 2024

ISBN: (纸本)9781957171395

关键词： Optical depth

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Solid High-Speed Synchronous Reluctance Rotor Enabled by Multi-Material Additive Manufacturing

Solid High-Speed Synchronous Reluctance Rotor Enabled by Mul...

引用

2023 IEEE Energy Conversion Congress and Exposition, ECCE 2023

作者： Newman, Dante Faue, Patrick Nishanth, F.N.U. Rankouhi, Behzad Pfefferkorn, Frank E. Thoma, Dan J. Severson, Eric University of Wisconsin-Madison Department of Electrical and Computer Engineering MadisonWI53706 United States University of Wisconsin-Madison Department of Mechanical Engineering MadisonWI53706 United States University of Wisconsin-Madison Department of Materials Science and Engineering MadisonWI53706 United States

ISBN: (纸本)9798350316445

Synchronous reluctance (SynR) motor technology is promising to realize rare-earth material-free electric machines. However, structural challenges limit operation speed and subsequently power density compared to machines with rare-earth permanent magnets. This paper proposes and investigates multi-material additive manufacturing (MMAM) as a key-enabler to realize power-dense SynR machines. It does so by guiding magnetic flux through a solid rotor component by selective placement of magnetic and non-magnetic materials to enable high-speed operation. To validate this concept, samples are manufactured using a MMAM process and experimentally characterized to assess the structural and magnetic properties that can be expected for the proposed rotors. The data is then used in a multi-physics modeling framework to explore the design space of new MMAM rotor concepts. The simulated results in this paper reveal that MMAM technology can enable a 4x increase in rotor speed, resulting in 400 % power density improvements. The MMAM rotors achieved tip speeds of approximately 300 m/s and rotational speeds over 55 kRPM at comparable efficiencies to conventional designs, despite the presence of existing MMAM geometry restrictions. This study ultimately demonstrates that MMAM technology has the potential to enhance SynR machine operation speed and power density, making it a valuable option for high-performance applications. © 2023 IEEE.

关键词： 3D printed electric machines additive manufacturing multi-material additive manufacturing optimization power density synchronous reluctance

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Reproducibility of Properties of the Zirconia-Based Composites 11

Reproducibility of Properties of the Zirconia-Based Composit...

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11th IEEE International Workshop on Metrology for AeroSpace, MetroAeroSpace 2024

作者： Hevorkian, Edvin Jozwik, Jerzy Rucki, Miroslaw Kolodnitskyi, Vasyl Morozova, Oksana Dziedzic, Krzysztof University of Life Sciences in Lublin Faculty of Production Engineering Lublin Poland Lublin University of Technology Mechanical Engineering Faculty Department of Production Engineering Lublin Poland Casimir Pulaski Radom University Faculty of Mechanical Engineering Radom Poland V.Bakul Institute for Superhard Materials National Academy of Sciences of Ukraine Kyiv Ukraine Ukrainian State University of Railway Transport Wagon Engineering and Production Quality Department Kharkiv Ukraine Institute of Computer Science Lublin University of Technology Electrical Engineering and Computer Science Faculty Lublin Poland

ISBN: (纸本)9798350385045

This paper presents results of investigations on the reproducibility of the properties of important refractory matrix composites used in aerospace industry. The method of fabrication was electroconsolidation, which was a modified version of Spark Plasma Sintering (SPS) with directly applied alternating current. The composites were sintered out of zirconia nanopowder, which served either as a reinforcement in alumina matrix, or as a matrix reinforced with SiC nanofibers. In order to keep the sintering conditions repeatable, measurements of linear compaction, temperature and pressure were applied. The results demonstrated that the accuracy of measurements was sufficient to ensure repeatable properties of the sintered composites. © 2024 IEEE.

关键词： Reinforcement

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AD-band Traveling-Wave Amplifier by Embedding GaN HEMTs as Current Probes in a SiC SIW

AD-band Traveling-Wave Amplifier by Embedding GaN HEMTs as C...

引用

Microwave, MTT-S International Symposium

作者： Lei Li Tianze Li Patrick Fay James C. M. Hwang School of Electrical and Computer Engineering Cornell University USA Department of Materials Science and Engineering Cornell University USA Department of Electrical Engineering University of Notre Dame USA

ISBN: (数字)9798350375046

ISBN: (纸本)9798350375053

Conventional power combiners based on coplanar or microstrip transmission lines suffer from high loss at D band or higher frequencies. By contrast, power combiners based on substrate-integrated waveguides (SIWs) can have low loss, high power capacity, and minimum crosstalk. Recently, aD-band traveling-wave amplifier (TWA) was demonstrated by embedding transistors in the middle of an SIW as voltage probes to radiate power into the SIW. The voltage probes were realized through hot through-substrate vias (TSVs), which were not supported by all semiconductor foundries. As an alternative, this work embeds transistors along the sidewalls of an SIW as current probes through standard TSVs that are grounded to the backside metal layer. This approach combines twice as many transistors per unit length of the SIW without either hot TSVs or cross-SIW interconnects. This results in at least 5-dB-higher output power compared to the previously demonstrated TWA with voltage probes. The measured output power of the present TWA at 140 GHz is at least 19 dBm, limited by the available input power. The measured output power agrees with that simulated and simulation indicates an output power of 23 dBm under 1-dB gain compression. In this proof of concept, the demonstration is based on monolithic integration of unit-cell transistors and an SIW. In the future, larger transistors in a multi-stage amplifier can be used to drive each current probe for a TWA of higher gain, output power, and efficiency. The present concept of efficient power combining is equally applicable to heterogeneous integration and is material- and technology-agnostic. For example, transistors can be fabricated in a Si chiplet before integration with an SIW fabricated in a Si interposer.

关键词： Semiconductor device measurement Power measurement Power combiners Power amplifiers Transmission line measurements Silicon Transistors

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Coupling monolayer transition metal dichalcogenide to a strain-tunable photonic crystal cavity

Coupling monolayer transition metal dichalcogenide to a stra...

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2023 Conference on Lasers and Electro-Optics, CLEO 2023

作者： Manna, Arnab Froch, Johannes E. Pumulo, Sinabu Cenker, John Barnard, Arthur Xu, Xiaodong Majumdar, Arka Department of Physics University of Washington SeattleWA98195 United States Department of Electrical & Computer Engineering University of Washington SeattleWA98195 United States Department of Materials Science and Engineering University of Washington SeattleWA98195 United States

We demonstrate a large in-situ strain tuning of cavity coupled photoluminescence of nanofabricated optical cavities integrated with a monolayer WSe2 using a piezo-strain device capable of operating at cryogenic temper... 详细信息

ISBN: (纸本)9781957171258

关键词： Monolayers

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Deep Learning Model for Classifying Public Opinions on Energy Sector IHSG Stocks on the Twitter Social Media Platform

Deep Learning Model for Classifying Public Opinions on Energ...

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2023 International Conference on Artificial Intelligence Robotics, Signal and Image Processing, AIRoSIP 2023

作者： Sulistio, Bambang Heryadi, Yaya Lukas Suparta, Wayan Sonata, Ilvico Binus Graduate Program - Doctor of Computer Science Bina Nusantara University Computer Science Department Jakarta Indonesia Universitas Katolik Indonesia Atma Jaya Cognitive Engineering Research Group Jakarta Indonesia Institut Teknologi Nasional Yogyakarta Faculty of Industrial Technology Department of Electrical Engineering Yogyakarta Indonesia

ISBN: (纸本)9798350327472

Capital market transactions provide an opportunity for investors to acquire ownership of company shares and capital gains, as well as dividends. However, alongside the benefits, there are risks of capital loss and liquidation, leading to stress and depression due to profit targets and decision-making errors. To mitigate the risk of decision-making errors in investment, data analysis is needed, including sentiment analysis, which influences stock prices. This study aims to develop a new deep learning model to classify Indonesian public opinion on JCI stocks, especially the Energy sector, obtained from the Twitter social media platform. The model will perform sentiment analysis and categorize opinions as negative, neutral, or positive. We created a dataset that was trained using Bidirectional Encoder Representations from Transformers (BERT) to summarize the analysis of public sentiment above so that it can assist investors in studying public sentiment as a reference for investing with a yield precision of 76%, Recall of 77%, and F1-score on 76%. © 2023 IEEE.

关键词： Tweets

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A Comparison of CdS and Zn(O,S) Buffer Layers in (Ag,Cu)(In,Ga)Se2 Solar Cells 52

A Comparison of CdS and Zn(O,S) Buffer Layers in (Ag,Cu)(In,...

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52nd IEEE Photovoltaic Specialist Conference, PVSC 2024

作者： Miller, Michael F. Kanevce, Ana Baan, Marzieh Gutzler, Rico Kuciauskas, Darius Friedlmeier, Theresa Magorian Grassman, Tyler J. Arehart, Aaron R. Stuttgart70563 Germany National Renewable Energy Laboratory GoldenCO80401 United States The Ohio State University Department of Electrical & Computer Engineering ColumbusOH43210 United States The Ohio State University Department of Materials Science & Engineering ColumbusOH43210 United States

ISBN: (纸本)9781665464260

Cu(In,Ga)Se2-based solar cells typically use a CdS buffer layer, even though its relatively low bandgap causes parasitic absorption. While alternatives to CdS have been explored in other studies, limited results have been shown for Ag-alloyed CIGS (ACIGS). In this study, ACIGS solar cells with both CdS and Zn(O,S) buffer layers were fabricated and compared for solar cell performance. The Zn(O,S) buffer slightly improved Jsc through reduced absorption, although surface optimization is necessary. The Zn(O,S) ACIGS also had improved FF through reduced series resistance and ideality factor, which could be improved further through optimization. However, the Voc in the Zn(O,S) samples was reduced, likely due to increased bulk and front interface recombination. This study shows the promise of Zn(O,S) as a buffer layer in ACIGS solar cells and suggests pathways for further improvement. © 2024 IEEE.

关键词： Silver alloys

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