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2024 International Conference on Smart Computing, IoT and Machine Learning, SIML 2024

作者： Prabowo, Muhammad Agung Soekirno, Santoso Ananda, Naufal Asri, Devina Putri Yulizar, David Adi, Suko Prayitno Martarizal Suhandi, Nazori University of Indonesia Faculty of Mathematics and Natural Science Departement of Physics Depok Indonesia Bandung Institute of Technology Departement of Instrumentation and Control Bandung Indonesia Banten Climatology Station Indonesia Meteorology Climatology and Geophysics Agency South Tangerang Indonesia State College of Meteorology Climatology and Geophysics Tangerang Indonesia Universitas Indo Global Mandiri Faculty of Computer Science Department of Informatics Palembang Indonesia

ISBN: (纸本)9798350364101

Drought events have an impact on various sectors such as the economic, agricultural, environmental and social sectors. The impact of drought needs to be minimized by designing a drought prediction system, this is an effort to disseminate early warning information based on climate and hydrological aspects. Drought prediction uses Multi-Layer Perceptron (MLP) algorithm model to predict drought based on Standardized Precipitation Index (SPI) for 1 and 3 months. SPI is one of the drought indices calculated through rainfall analysis. Predictions were made using rainfall data obtained from the FY-4A QPE satellite, then processed into monthly rainfall accumulations for the 2019-2020 period. FY-4A QPE data is corrected based on rainfall observation data at the observation rain gauge. The corrected FY-4A QPE data is used to predict drought using the SPI1 (1 Month) and SPI3 (3 Months) indices. SPI1 shows fluctuations and a very small Nash-Sutcliffe Efficiency (NSE) value of -0.11, while SPI3 shows a model that is able to follow the peak and valley fluctuations of the actual value as well as an increase in the NSE value of 0.65 and a decrease in the Root Mean Square Error (RMSE) value of 1.43 in SPI1 to 0.77 in SPI3. Drought modeling using MLP was successfully implemented and it showed that as the time span increases, the SPI prediction performance gets better. © 2024 IEEE.

关键词： Drought

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A Comprehensive Simulation Package for Analysis of Multilayer Spintronic Devices

arXiv

引用

arXiv 2022年

作者： Mojsiejuk, Jakub Ziętek, Slawomir Grochot, Krzysztof Skowroński, Witold Stobiecki, Tomasz Institute of Electronics AGH University of Science and Technology Al. Mickiewicza 30 Kraków30-059 Poland Faculty of Physics and Applied Computer Science AGH University of Science and Technology Al. Mickiewicza 30 Kraków30-059 Poland

We present cmtj - a comprehensive simulation package that allows large-scale macrospin simulations for a variety of multilayer spintronics devices. Apart from conventional static simulations, such as magnetoresistance and magnetisation hysteresis loops, cmtj implements a mathematical model of dynamic experimental techniques commonly used for spintronics devices characterisation, for instance: spin diode ferromagnetic resonance, pulse-induced microwave magnetometry, or harmonic Hall voltage measurements. We demonstrate the accuracy of the macrospin simulations on a variety of examples, accompanied by some experimental results. © 2022, CC BY.

关键词： Multilayers

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Polarization Control for Continuous Optical Frequency Transfer

Polarization Control for Continuous Optical Frequency Transf...

引用

IEEE International Frequency Control Symposium

作者： P. Krehlik Ł. Buczek Ł. Śliwczyński Krzysztof Turza Faculty of Computer Science Electronics and Telecommunications AGH University of Science and Technology Kraków Poland Poznan Supercomputing and Networking Center (PSNC) Poznań Poland

SummaryIn this work we present a solution for controlling the polarization state of the signal reaching the remote laser station terminating the optical frequency transfer link (or its section). The proposed controller eliminates the occasional fading of the beat note between the laser and the incoming signal, which is typically observed due to random wandering of the state of polarization of the signal traveling down an optical fiber. The efficiency of the solution is demonstrated for optical frequency transfer via an optical path consisting of real outdoor fibers, as well as fibers on spools and also polarization scramblers speeding up natural polarization fluctuations.

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On-demand electrohydrodynamic jetting of an ethylene glycol and water mixture-system of controlled picoliter fluid deposition

On-demand electrohydrodynamic jetting of an ethylene glycol ...

引用

Printing for Fabrication 2021

作者： Dijksman, J.F. Stachewicz, U. University of Twente Faculty Science and Technology Physics of Fluids Drienerlolaan 5 Enschede7522 NB Netherlands AGH University of Science and Technology Faculty of Metals Engineering and Industrial Computer Science Al. A. Mickiewicza 30 Kraków30-059 Poland

ISBN: (纸本)9780892083565

On-demand electrohydrodynamic jetting also called electrohydrodynamic atomization (EHDA) is a method to jet small amounts of fluid out of a nozzle with a relatively large diameter by switching on and off an electrical field between the nozzle and the substrate. The total amount of volume deposited is up to 5 pL. The set-up consists of a vertically placed glass pipette with a small nozzle directed downward and a flat substrate placed close to the end of the nozzle. Inside the pipette, an electrode is mounted close to the entrance of the nozzle. The electrode is connected to a high voltage power amplifier. Upon switching on the electrical field, the apparent surface tension drops, the meniscus deforms into a cone and fluid starts to flow toward the nozzle deforming the meniscus. At a certain moment the cone reaches the Taylor cone dimensions and from its tip a jet emerges that decomposes into a stream of charged fL droplets that fly toward the substrate. This process stops when the pulse is switched off. After switching off, the meniscus returns slowly to its equilibrium position. The process is controlled by different time constants, such as the slew rate of the power amplifier and the RC time of the electrical circuit composed of the electrical resistance in the fluid contained in the nozzle between the electrode and the meniscus, and the capacitance of the gap between the meniscus and the flat substrate. Another time constant deals with the fluid flow during the growth of the meniscus, directly after switching on the pulse. This fluid flow is driven by hydrostatic pressure and opposed by a viscous drag in the nozzle. The final fluid flow during droplet formation is governed by the balance between the drag of the charge carriers inside the fluid, caused by the current associated with the charged droplets leaving the meniscus and the viscous drag. These different phenomena will be discussed theoretically and compared to experimental results. © Society for Imaging Sci

关键词： Electrodes

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Correlations among neutron-proton and neutron-deuteron elastic scattering observables

arXiv

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arXiv 2022年

作者： Volkotrub, Yu. Skibiński, Roman Golak, J. Witala, H. AGH University of Science and Technology Faculty of Physics and Applied Computer Science KrakówPL-30055 Poland M. Smoluchowski Institute of Physics Jagiellonian University KrakówPL-30348 Poland

We employ two models of the nucleon-nucleon force: the OPE-Gaussian as well as the chiral N4LO and N4LO+ interactions with semilocal regularization in momentum space to study correlations among two-nucleon and three-nucleon elastic scattering observables. These models contain a number of free parameters whose values and covariance matrices are evaluated from a fit to the two-nucleon data. Such detailed knowledge of parameters allows us to create, using various sets of statistically generated parameters, numerous versions of these potentials and next apply them to two- and three-nucleon scattering to make predictions of various observables at the reaction energies up to 200 MeV. This permits a systematic analysis of correlations among two-nucleon and three-nucleon observables, basing on a relatively big sample of predictions. We found that most observables in neutron-proton and neutron-deuteron systems are uncorrelated, but there are exceptions revealing strong correlations, which depend on the reaction energy and scattering angle. This information may be useful for precise fixing free parameters of two-nucleon and three-nucleon forces and for understanding dependencies and correlations between potential parameters and observables. © 2022, CC BY.

关键词： Covariance matrix

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Enhancement and anisotropy of electron Landé factor due to spin-orbit interaction in semiconductor nanowires

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Physical Review B 2024年第8期109卷 085411-085411页

作者： Julian Czarnecki Andrea Bertoni Guido Goldoni Paweł Wójcik AGH University of Krakow Faculty of Physics and Applied Computer Science al. A. Mickiewicza 30 30-059 Krakow Poland CNR-NANO S3 Istituto Nanoscienze Via Campi 213/a 41125 Modena Italy Department of Physics Informatics and Mathematics University of Modena and Reggio Emilia via Campi 213/a 41125 Modena Italy

We investigate the effective Landé factor in semiconductor nanowires with strong Rashba spin-orbit coupling. Using the k·p theory and the envelope function approach we derive a conduction band Hamiltonian where g* is explicitly related to the spin-orbit coupling constants αR. Our model includes orbital effects from the Rashba spin-orbit term, leading to a significant enhancement of the effective Landé factor which is naturally anisotropic. For nanowires based on the low-gap, high spin-orbit coupled material InSb, we investigate the anisotropy of the effective Landé factor with respect to the magnetic field direction, exposing a twofold symmetry for the bottom gate architecture. The anisotropy results from the competition between the localization of the envelope function and the spin polarization of the electronic state, both determined by the magnetic field direction.

关键词： Spin-orbit coupling Nanowires Gyromagnetic ratio k dot p method

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Delay-Beat Differential Phase Demodulation for Laser Phase Noise Immunity in Phase-Sensitive OTDR

Delay-Beat Differential Phase Demodulation for Laser Phase N...

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2023 Asia Communications and Photonics Conference/2023 International Photonics and Optoelectronics Meetings, ACP/POEM 2023

作者： Qian, Heng Li, Chuan Li, Chengli Kunming University of Science and Technology Yunnan Key Laboratory of Computer Technologies Application Faculty of Information Engineering and Automation Kunming China School of Physics and Electronic Information Yunnan Normal University Yunnan Key Laboratory of Opo-electronic Information Technology Kunming China

ISBN: (纸本)9798350312614

A phase demodulation method immune to laser phase noise based on time-delay beat-frequency coherent Φ-OTDR is proposed. In this method, the two Rayleigh backscattered light beams with time delay are beat with local light beams respectively, and the phase difference of the two beat signals is used instead of the traditional distance-difference phase to obtain the local disturbance information. In this way, the impact of laser phase noise introduce by the distance-difference phase is avoid, and the constraint of laser linewidth on phase demodulation performance is weakened. In the experiment, a demodulation accuracy of -63.5dB rad2/Hz is achieved under the condition of a laser with a linewidth of 100kHz, which is improve by 11dB compared to traditional phase demodulation method. © 2023 IEEE.

关键词： distributed optical fiber sensing laser phase noise phase demodulation phase-sensitive optical time-domain reflectometry

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Interdigital CPW Metamaterial Surfaces for Modern Wireless Communication Systems

Interdigital CPW Metamaterial Surfaces for Modern Wireless C...

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2023 IEEE International Symposium on Antennas and Propagation, ISAP 2023

作者： Chomtong, Pongsathorn Krachodnok, Piyaporn Chudpooti, Nonchanutt Akkaraekthalin, Prayoot Department of Teacher Training in Electrical Engineering Faculty of Technical Education King Mongkut’s University of Technology North Bangkok Bangkok10800 Thailand Institute of Engineering School of Telecommunication Engineering Suranaree University of Technology Nakhon Ratchasima Thailand Department of Industrial Physics and Medical Instrumentation Faculty of Applied Science King Mongkut’s University of Technology North Bangkok Bangkok10800 Thailand Department of Electrical and Computer Engineering Faculty of Engineering King Mongkut’s University of Technology North Bangkok Bangkok10800 Thailand

ISBN: (纸本)9798350341140

This paper proposes the design of metamaterial surfaces based on interdigital coplanar waveguide (CPW) unit cells. By using this technique, the unit cell can have negative permeability with size reduction to λ/8. The result causes from the slow wave effect on transmission line in the structure, which electrical and physical lengths of transmission line are not equal from that effect. The proposed matamaterial surfaces at some resonant frequencies have been designed and used as reflectors and directors applied for antenna applications. Using the designed reflectors or directors, the antenna performances have been increased. The proposed metamaterial surfaces will be appropriate for modern wireless communication systems. © 2023 IEEE.

关键词： director interdigital CPW unit cell metamaterial reflector metamaterial surface

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Findings of the Third Shared Task on Multilingual Coreference Resolution

arXiv

引用

arXiv 2024年

作者： Novák, Michal Dohnalová, Barbora Konopík, Miloslav Nedoluzhko, Anna Popel, Martin Pražák, Ondřej Sido, Jakub Straka, Milan Žabokrtský, Zdeněk Zeman, Daniel Charles University Faculty of Mathematics and Physics Institute of Formal and Applied Linguistics Prague Czech Republic University of West Bohemia Faculty of Applied Sciences Department of Computer Science and Engineering Pilsen Czech Republic

The paper presents an overview of the third edition of the shared task on multilingual coreference resolution, held as part of the CRAC 2024 workshop. Similarly to the previous two editions, the participants were challenged to develop systems capable of identifying mentions and clustering them based on identity coreference. This year's edition took another step towards real-world application by not providing participants with gold slots for zero anaphora, increasing the task's complexity and realism. In addition, the shared task was expanded to include a more diverse set of languages, with a particular focus on historical languages. The training and evaluation data were drawn from version 1.2 of the multilingual collection of harmonized coreference resources CorefUD, encompassing 21 datasets across 15 languages. 6 systems competed in this shared task. Copyright © 2024, The Authors. All rights reserved.

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Higher order cumulants of transverse momentum and harmonic flow in relativistic heavy ion collisions

引用

Physical Review C 2021年第1期104卷 014905-014905页

作者： Piotr Bożek Rupam Samanta Faculty of Physics and Applied Computer Science AGH University of Science and Technology aleja Mickiewicza 30 30-059 Cracow Poland

Higher order symmetric cumulants of global collective observables in heavy ion collisions are studied. The symmetric cumulants can be straightforwardly constructed for scalar observables: the average transverse momentum, the multiplicity, and the squares of harmonic flow vectors. Third and fourth order cumulants are calculated in the hydrodynamic model. A linear predictor of the average transverse momentum and harmonic flow coefficients in a collision is used to predict the values of the cumulants from the moments of the initial distribution. The symmetric cumulants divided by the averages (or the standard deviations) of the considered observables can be used as a fine tool to study correlations present in the initial state of the collision.

关键词： Collective flow Particle correlations & fluctuations Relativistic heavy-ion collisions

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