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1. Design and Implementation of Selective Active EMI Filter with Digital Resonant Controller

   https://doi.org/10.1109/ECCE44975.2020.9235457  

   Peng, Hongwu; Narayanasamy, Balaji; Emon, Asif Imran; Yuan, Zhao; Ul Hassan, Mustafeez; Luo, Fang (October 2020, 2020 IEEE Energy Conversion Congress and Exposition (ECCE))

   null (Ed.)

   In the power electronics equipment, passive EMI filters occupy up to 30% of system's volume and weight. In order to reduce the size of passive EMI filter in the power electronics system, active EMI filters (AEF) is introduced. With the AEF approaches, the size of the passive component within the EMI filter can be reduced by more than 50%. The higher attenuation achieved by AEFs, the more size reduction can be obtained through AEFs methodology. However, the performance of AEF with feedback control is limited to around 24 dB attenuation in the reported work. New methodology needs to be found to push forward the performance. In this study, a novel digital active EMI filter (DAEF) with the resonant controller, which provides ultra high-gain at frequencies of interest, is demonstrated for DM noise attenuation. The experimental test results show that the proposed EMI filter has 45 dB more attenuation at 150 kHz than the conventional passive EMI filter, which is also the highest attenuation reported in the AEF literature. 

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2. Curriculum improvements in power engineering

   https://doi.org/10.1109/FIE.2001.963931  

   O'Neill-Carrillo, E.; Irizarry-Rivera, A.; Velez-Reyes, M. (October 2001, 31st Annual Frontiers in Education Conference. Impact on Engineering and Science Education)

   null (Ed.)

   The Power Engineering Group at the University of Puerto Rico-Mayaguez (UPRM) has implemented several strategies to improve its curriculum and meet new ABET accreditation criteria. Strategies include the revision of course contents, integration of laboratory practices to courses, and a more prominent role of undergraduate research and power electronics in the power engineering curriculum. Courses are being updated to include contemporary topics while keeping fundamental engineering principles. A recent grant by NSF will support on-going efforts to create laboratory practices that would connect the teaching of theoretical principles to actual implementations. Participation in the Center for Power Electronics Systems, a NSF Engineering Research Center, has given UPRM the opportunity to expand course offerings and undergraduate research in power engineering. An important outcome of this curriculum improvement is to motivate students to take an active role in the learning process. 

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3. Mixed-technology quasi-reflectionless planar filters: bandpass, bandstop, and multi-band designs

   https://doi.org/https://doi.org/10.1017/S1759078719000230  

   Dakotah, Simpson; Garcia-Gomez, Roberto; Psychogiou, Dimitra (June 2019, International journal of microwave and wireless technologies)

   The design of mixed-technology quasi-reflectionless planar bandpass filters (BPFs), bandstop filters (BSFs), and multi-band filters is reported. The proposed quasi-reflectionless filter architectures comprise a main filtering section that determines the power transmission response (bandpass, bandstop, or multi-band type) of the overall circuit network and auxiliary sections that absorb the reflected radio-frequency (RF) signal energy. By loading the input and output ports of the main filtering section with auxiliary filtering sections that exhibit a complementary transfer function with regard to the main one, a symmetric quasi-reflectionless behavior can be obtained at both accesses of the overall filter. The operating principles of the proposed filter concept are shown through synthesized first-order BPF and BSF designs. Selectivity-increase techniques are also described. They are based on: (i) cascading in-series multiple first-order stages and (ii) increasing the order of the filtering sections. Moreover, the RF design of quasi-reflectionless multi-band BPFs and BSFs is discussed. A hybrid integration scheme in which microstrip-type and lumped-elements are effectively combined within the filter volume is investigated for size miniaturization purposes. For experimental validation purposes, two quasi-reflectionless BPF prototypes (one- and two-stage architectures) centered at 2 GHz and a second-order BSF prototype centered at 1 GHz were designed, manufactured, and measured. 

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4. Node-Asynchronous Implementation of Filter Banks on Graphs

   https://doi.org/10.1109/IEEECONF51394.2020.9443349  

   Teke, Oguzhan; Vaidyanathan, P. P. (November 2020, Proc. Asil. Conf. Sig., Sys., and Comp)

   null (Ed.)

   Filter banks on graphs are shown to be useful for analyzing data defined over networks, as they decompose a graph signal into components with low variation and high variation. Based on recent node-asynchronous implementation of graph filters, this study proposes an asynchronous implementation of filter banks on graphs. In the proposed algorithm nodes follow a randomized collect-compute-broadcast scheme: if a node is in the passive stage it collects the data sent by its incoming neighbors and stores only the most recent data. When a node gets into the active stage at a random time instance, it does the necessary filtering computations locally, and broadcasts a state vector to its outgoing neighbors. When the underlying filters (of the filter bank) are rational functions with the same denominator, the proposed filter bank implementation does not require additional communication between the neighboring nodes. However, computations done by a node increase linearly with the number of filters in the bank. It is also proven that the proposed asynchronous implementation converges to the desired output of the filter bank in the mean-squared sense under mild stability conditions. The convergence is verified also with numerical experiments. 

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5. Revolutionizing Papertronics: Advanced Green, Tunable, and Flexible Components and Circuits

   https://doi.org/10.1002/adsu.202400049  

   Rafiee, Zahra; Elhadad, Anwar; Choi, Seokheun (February 2024, Advanced Sustainable Systems)

   Abstract Papertronics introduce a sustainable, cost‐effective revolution in electronics, especially for the Internet of Things. This research overcomes the traditional challenges of paper's porosity, which has impeded electronic component fabrication and performance. A novel approach that harnesses paper's natural capillary action, combined with hydrophobic wax patterning, to achieve precise vertical integration of electronic components is introduced. This method marks a significant departure from conventional surface deposition techniques. This study demonstrates the successful creation of tunable resistors, capacitors, and field‐effect transistors, embedded within a single sheet of paper. Contrary to previous assumptions that impeded the use of paper, its rough and porous texture as a strategic advantage, facilitating the precise fabrication of intricate electronic components is leveraged. Machine learning algorithms play an important role in predicting and enhancing the performance of these papertronic components. This innovation facilitates the development of compact printed circuit boards with increased circuit density, enabling the integration of diverse analog and digital circuits in either single or multi‐layer paper formats. The resulting papertronic systems exceed performance benchmarks, offering eco‐friendly disposal through biodegradability or incineration. These breakthroughs establish papertronics as a feasible, eco‐friendly alternative in the electronics industry, permitting widespread adoption and continuous innovation in sustainable electronic solutions. 

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