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International Spring Seminar on Electronics technology

作者： Halim Choi Agata Skwarek Tamás Hurtony Jaeduk Byun Balázs Illés Department of Electronics Technology Faculty of Electrical Engineering and Computer Science Budapest University of Technology and Economics Budapest Hungary Department of Microelectronics Łukasiewicz Research Network—Institute of Microelectronics and Photonics Kraków Poland Department of Physics College of Science & Technology Dankook University Cheonan Republic of Korea

In the current study, tin (Sn) whisker growth was observed on the surface of the SAC0307-SiC composite solder joint. A commercial SAC0307 solder alloys were reinforced with SiC nanophases to produce composite solder joints. SiC nanoparticles and nanowires were mixed with SAC0307 solder paste using the ball milling method. The solder paste was deposited by stencil printing on the test PCBs, and 0805 chip resistors were soldered by IR reflow method. The solder joints facilitated the growth of the Sn whisker through accelerated lifetime tests. The samples were observed by scanning electron microscopy (SEM) every 1000 hours of the test. On the SiC composite solder joints, Sn whiskers and large corrosion spots were observed after 1000 hours of the THB test. In the case of SAC0307 reference samples, only minor corrosion signs were found after 1000 hours of the THB test. The main finding was that the addition of SiC nanophases promoted Sn whisker growth and decreased the corrosion resistance of the composite solder.

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Simulating the J-PET detector on NVIDIA ray tracing hardware

Simulating the J-PET detector on NVIDIA ray tracing hardware

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作者： Bialas, P. Sagalo, P. Nowakowski, K. Faculty of Physics Astronomy and Applied Computer Science Jagiellonian University Kraków Poland

In this contribution, we present preliminary results of using graphic card with hardware support for ray tracing for physics simulation of a positron emission tomography (PET) scanner. On our simplistic setup, we notice an impressive (about 350 times) speedup compared to Geant4 code running on modern multicore CPU. We expect this speedup to come down but remain substantial also for other more complicated scenarios. © 2020 Jagellonian university. All rights reserved.

关键词： Ray tracing

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Coordinated Control of Three-Level T-Type Inverter for Renewable Energy Applications: Integrating Predictive Control with External RLC Estimation

Coordinated Control of Three-Level T-Type Inverter for Renew...

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International Conference on Green technology and Sustainable Development (GTSD)

作者： Tin Lu Trung Khoa Dang Nguyen Tran Trinh Thi Ly Tran Dang Quang Pham NhuanAn Le Minh Duc Pham Faculty of Electrical and Electronics Engineering Ho Chi Minh City University of Technology VNU-HCM Ho Chi Minh City Viet Nam Department of Physics and Computer Science Faculty of Physics and Engineering Physics University of Science Ho Chi Minh City Vietnam Vietnam National University Ho Chi Minh City Viet Nam Faculty of Transportation Engineering Ho Chi Minh City University of Technology VNU-HCM Ho Chi Minh City Vietnam Ho Chi Minh City Viet Nam

ISBN: (数字)9798350386073

ISBN: (纸本)9798350386080

Three-phase inverters, particularly three-level converters like the three-level T-type inverter $(3\text{LT}^{2}\mathrm{I})$ , play a pivotal role in renewable energy applications, offering advantages such as improved efficiency and reduced costs due to their unique design. However, the operation of the $3\text{LT}^{2}\mathrm{I}$ may lead to a capacitor voltage imbalance, resulting in increased total harmonic distortion (THD) of output currents and overvoltage across switches. Various control methods, including proportional-integral (PI) controllers and predictive control schemes, have been proposed to address this issue. Despite the fast dynamic response of predictive control schemes, their operational dependency on prior knowledge of system load parameters poses a significant challenge. This paper proposes a coordinated control approach that integrates a model predictive control (MPC) scheme with an external RLC online estimator to address the challenges associated with the $3\text{LT}^{2}\mathrm{I}$ . The proposed strategy aims to achieve precise current tracking, balanced capacitor voltage, and continuous updating of load impedance parameters for optimal current control performance. Simulations are conducted under various load scenarios to demonstrate the feasibility and effectiveness of the proposed control method.

关键词： Total harmonic distortion Renewable energy sources Adaptation models PI control Capacitors Inverters Voltage control

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Aharonov-Bohm oscillations of four-probe resistance in topological quantum rings in silicene and bilayer graphene

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Physical Review B 2020年第11期101卷 115308-115308页

作者： Bartłomiej Rzeszotarski Alina Mreńca-Kolasińska Bartłomiej Szafran AGH University of Science and Technology Faculty of Physics and Applied Computer Science al. Mickiewicza 30 30-059 Kraków Poland

We consider observation of Aharonov-Bohm oscillations in clean systems based on the flow of topologically protected currents in silicene and bilayer graphene. The chiral channels in these materials are defined by the flips of the vertical electric field. The line of the flip confines chiral currents flowing along it in the direction determined by the valley. We present an electric field profile that forms a crossed ring to which four terminals can be attached, and find that the conductance matrix elements oscillate in the perpendicular magnetic field in spite of the absence of backscattering. We propose a four-probe resistance measurement setup, and demonstrate that the resistance oscillations have large visibility provided that the system is prepared in such a way that a direct transfer of the chiral carriers between the current probes is forbidden.

关键词： Aharonov-Bohm effect Electrical conductivity Graphene Silicene Landauer formula Tight-binding model

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A Ready-to-Use Beam Steering Application Using a 3D-Printed System Integrated with a Dielectric Lens and Ultra-Wideband Antenna

A Ready-to-Use Beam Steering Application Using a 3D-Printed ...

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International Technical Conference o Circuits/Systems, computers and Communications (ITC-CSCC)

作者： Patchadaporn Sangpet Virote Pirajnanchai Suramate Chalermwisutkul Nonchanutt Chudpooti Deparment of Electrical and Computer Engineering Faculty of Engineering King Mongkut's University of Technology North Bangkok Bangkok Thailand Deparment of Electronics and Telecommunication Engineering Faculty of Engineering Rajamangala University of Technology Thanyaburi Pathum Thani Thailand The Sirindhorn International Thai-German Graduate School of Engineering King Mongkut's University of Technology North Bangkok Bangkok Thailand Deparment of Industrial Physics and Medical Instrumentation Faculty of Applied Science King Mongkut's University of Technology North Bangkok Bangkok Thailand

ISBN: (数字)9798350379051

ISBN: (纸本)9798350379068

The study introduces a 3D-printed lens assembly that has been rotated and equipped with an ultrawideband (UWB) antenna, designed specifically for beam-steering applications. The primary objective is to achieve beam steering by integrating the rotating 3D-printed lens assembly with a hemispherical lens and UWB antenna. The UWB antenna is constructed on an FR-4 substrate, while the hemispherical lens and the rotating 3D-printed lens assembly are composed of Acrylonitrile Butadiene Styrene (ABS). To allow the hemispherical lens to rotate to a certain angle, a collection of 3D-printed lenses that can be rotated was created. These lenses were marked with five predetermined angles: 300 degrees, 330 degrees, 0 degrees, 30 degrees, and 60 degrees. Both the modeling and experimental findings demonstrate that the UWB antenna with the 3D-printed rotatable hemispherical lens assembly is unable to guide the beam at a low frequency of 3.1 GHz. Nevertheless, at frequencies of 7.0 GHz and 10.6 GHz for intermediate and high frequencies, respectively, the beam can be directed based on the rotation of the hemispherical lens.

关键词： computers Beam steering Ultra wideband antennas Frequency measurement Dielectrics High frequency Assembly

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A 0.0046 mm low-distortion CMOS neural preamplifier for large-scale neuroelectronic interfaces 9

A 0.0046 mm low-distortion CMOS neural preamplifier for larg...

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9th International IEEE EMBS Conference on Neural Engineering, NER 2019

作者： Trzpil-Jurgielewicz, Beata Dabrowski, Wladyslaw Hottowy, Pawel Faculty of Physics and Applied Computer Science AGH University of Science and Technology Cracow Poland

ISBN: (纸本)9781538679210

We present a design and analysis of nonlinear distortions for low-area integrated neural preamplifier with pseudoresistor-based AC coupling. We evaluate the distortions as a function of frequency, signal amplitude and sizing of the pseudoresistors. We describe a preamplifier design in 0.18 μm SOI CMOS technology with Total Harmonic Distortions (THD) below 1% in the full range of frequencies and amplitudes of extracellular neural signals. The circuit noise is 5.82 μV rms in the Local Field Potential (LFP) frequency range (1-300 Hz) and 4.45 μV rms in the action potential (AP) range (300 Hz-5 kHz). The preamplifier occupies silicon area of 0.0046 mm and is suitable for recording systems with >10,000 channels per cm of the chip area, providing high-fidelity amplification for large-scale neural interfaces. © 2019 IEEE.

关键词： Integrated circuit design

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Vortex Counting and Velocimetry for Slitted Superconducting Thin Strips

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Physical Review applied 2023年第3期19卷 034098-034098页

作者： V.M. Bevz M.Yu. Mikhailov B. Budinská S. Lamb-Camarena S.O. Shpilinska A.V. Chumak M. Urbánek M. Arndt W. Lang O.V. Dobrovolskiy Physics Department V. Karazin Kharkiv National University Kharkiv 61022 Ukraine B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine Kharkiv 61103 Ukraine University of Vienna Faculty of Physics Vienna 1090 Austria University of Vienna Vienna Doctoral School in Physics Vienna 1090 Austria University of Vienna Faculty of Computer Science Vienna 1090 Austria CEITEC Brno University of Technology Brno 61200 Czech Republic

The maximal speed v∗ for magnetic flux quanta is determined by the energy relaxation of unpaired electrons and is thus essential for superconducting microstrip single-photon detectors (SMSPDs). However, the deduction of v∗ from the current-voltage (I-V) curves at zero magnetic field is hindered by the unknown number of vortices, nv, as a small number of fast-moving vortices can induce the same voltage as a large number of slow-moving ones. Here, we introduce an approach for the quantitative determination of nv and v∗. The idea is based on the Aslamazov and Larkin prediction of kinks in the I-V curves of wide and short superconducting constrictions when the number of fluxons crossing the constriction is increased by one. We realize such conditions in wide MoSi thin strips with slits milled by a focused ion beam and reveal quantum effects in a macroscopic system. By observing kinks in the I-V curves with increase of the transport current, we evidence a crossover from a single- to multifluxon dynamics and deduce v∗≃12 km/s. Our experimental observations are augmented with numerical modeling results, which reveal a transition from a vortex chain over a vortex jet to a vortex river with increase of nv and v. Our findings are essential for the development of one-dimensional and two-dimensional few-fluxon devices and provide a demanded approach for the deduction of maximal vortex velocities at the SMSPD operation conditions.

关键词： Superconductivity Vortex lattices

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Constraining the Bispectrum from Bouncing Cosmologies with Planck

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Physical Review Letters 2023年第19期130卷 191002-191002页

作者： Bartjan van Tent Paola C. M. Delgado Ruth Durrer Université Paris-Saclay CNRS/IN2P3 IJCLab 91405 Orsay France Faculty of Physics Astronomy and Applied Computer Science Jagiellonian University 30-348 Krakow Poland Department of Theoretical Physics Université de Genève Quai Ernest Ansermet 24 Genève 1211 Switzerland

Bouncing models of cosmology, as they arise, e.g., in loop quantum cosmology, can be followed by an inflationary phase and generate close-to-scale-invariant fluctuation spectra as observed in the cosmic microwave background (CMB). However, they are typically not Gaussian and also generate a bispectrum. These models can help to mitigate the large-scale anomalies of the CMB by considering substantial non-Gaussianities on very large scales, which decay exponentially on subhorizon scales. It was therefore thought that this non-Gaussianity would not be visible in observations, which can only probe subhorizon scales. We show that bouncing models with parameters such that they can significantly mitigate the large-scale anomalies of the CMB are excluded by the Planck data with high significance of, depending on the specific model, 5.4, 6.4, or 14 standard deviations.

关键词： Cosmic microwave background Quantum cosmology Quantum gravity

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Fuzzy Logic-Based Control of a Battery Energy Storage System to Mitigate Frequency Excursions in the Cuban Power System Caused by Electric Arc Furnaces

SSRN

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SSRN 2024年

作者： Domínguez, Julio Espinosa Serban, Ioan Breffe, Orlys Ernesto Torres Transilvania University of Brasov Department of Electrical Engineering and Applied Physics Faculty of Electrical Engineering and Computer Science Eroilor 29 Brasov500036 Romania Technological University of Havana Department of Electrical Engineering Faculty of Electrical Engineering Street 114 # 11901 e/ Ciclovía and Rotonda Havana19390 Cuba

This paper proposes an adaptive control for a battery energy storage system (BESS) using a fuzzy logic controller (FLC), specially designed to operate in parallel with an electric arc furnace (EAF) in the Cuban power system. The BESS control system was developed with considerations for the characteristics of the Cuban power system, the typical power demand profile of the EAF, and the lifetime of batteries. The primary goal is to mitigate the frequency excursions that currently occur during EAF operation, enabling the furnace to complete the smelting process without restrictions. Furthermore, the system aims to reduce battery overloading, thereby enhancing their lifetime. For this purpose, the BESS active power is managed by an adaptive compensator, governed by the FLC. Based on information coming from all the three components involved - power system frequency, furnace state and battery usage rate, the proposed FLC generates an optimum output to adjust the BESS behaviour. The performance of the proposed system was evaluated through simulations and experimental tests. The results demonstrate that using adaptive control applied to BESS can be an effective solution for steel plants connected to weakly-regulated power systems, such as the current Cuban power system. © 2024, The Authors. All rights reserved.

关键词： Fuzzy logic

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Persistent currents in topological and trivial confinement in silicene

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Physical Review B 2020年第7期101卷 075408-075408页

作者： Piotr Jurkowski Bartłomiej Szafran AGH University of Science and Technology Faculty of Physics and Applied Computer Science al. Mickiewicza 30 30-059 Kraków Poland

We consider states bound at the flip of the electric field in buckled silicene. Along the electric flip lines a topological confinement is formed with the orientation of the charge current and the resulting magnetic dipole moment determined by the valley index. We compare the topological confinement to the trivial one that is due to a local reduction of the vertical electric field but without energy gap inversion. For the latter the valley does not protect the orientation of the magnetic dipole moment from inversion by external magnetic field. We demonstrate that the topologically confined states can couple and form extended bonding or antibonding orbitals with the energy splitting influenced by the geometry and the external magnetic field.

关键词： Topological insulators 2-dimensional systems Quantum rings Silicene Topological materials Tight-binding model

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