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International Laser technology and Optics Symposium 2024, iLATOS2024

作者： Salim, Ali Aqeel Gan, KaiXuan Ghoshal, Sib Krishna Mufti, Nandang Obayes, Hayder K. Kadhim, Karrar Abdulameer Sagheer, Ali Hussein Sazali, Ezza Syuhada Yew, Tay Kuan Abd Aziz, Muhammad Safwan Bakhtiar, Hazri Universiti Teknologi Malaysia Johor Johor Bahru81310 Malaysia Department of Physics College of Education for Pure Science University of Wasit Wasit Iraq Center of Advanced Materials for Renewable Energy Universitas Negeri Malang Jl. Semarang 5 Malang65145 Indonesia Department of Physics Faculty of Science Universiti Teknologi Malaysia Skudai Johor Bahru81310 Malaysia Computer Techniques Engineering Department Faculty of Information Technology Imam Ja’afar Al-Sadiq University Baghdad Iraq College of Physical Education and Sport Science University of Wasit Iraq

Plasmonic metals-impregnated fiber-optic sensors (FOSs) became emergent for biomedical diagnostic, environmental monitoring, and security uses due to their excellent reliability sensitivity, stability, and adaptability. To develop accurate, cost-effective, and reliable humidity FOSs, Brilliant Blue dye-embedded titanium dioxide nanoparticles (BBD-TiO2NPs as sensing elements) were synthesized using a green and controllable pulsed laser ablation in liquid (PLAL) method. The optical properties of BBD-TiO2NPs were adjusted via the laser energies variation from 50 to 250 mJ. Various analytical measurements including UV-Vis, Fluorescence (FL) and FTIR-ATR spectroscopy were performed to determine the NPs attributes. The absorption spectra exhibited peaks at ~241, ~302, ~406 and ~667 nm, attributed to the σ-π*, σ-σ* transitions of BBD molecules and the π-π* transition of surface plasmon resonance (SPR). The FL emission spectra at ~463 nm showed the narrowest FWHM value (33.0) at the optimal laser energy of 150 mJ. FTIR spectra of both BBD and BBD-TiO2NPs confirmed the presence of hydroxyl and carbonyl functional groups. Tuning of NPs size, chemical bonding, and crystal phases of these materials demonstrate BBDTiO2NPs promising candidates for stable biosensors development. © 2025 Institute of physics Publishing. All rights reserved.

关键词： Titanium dioxide

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The effects of virtual reality on muscle synergies during walking and balancing in healthy adults

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Gait & Posture 2024年 113卷 55-56页

作者： Johannes Eichwalder Paul Kaufmann Thomas Mandl Brian Horsak Hans Kainz University of Vienna Centre for Sport Science and University Sports- Department of Sport and Human Movement Science Vienna Austria University of Applied Sciences for Technology and Digitalization Faculty Computer Science- Department Applied Mathematics & Physics Vienna Austria University of Applied Sciences St. Pölten Department of Health Sciences- Center for Digital Health and Social Innovation St. Pölten Austria

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Corrosion Behaviour of Alcrfe2ni2mox High-Entropy Alloys in Sulphuric Acid Solution

SSRN

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SSRN 2022年

作者： Czerski, Jakub Godlewska, Elżbieta Mitoraj-Królikowska, Marzena Marzec, Mateusz Goly, Marcin AGH University of Science and Technology Faculty of Materials Science and Ceramics Krakow Poland AGH University of Science and Technology Faculty of Metals Engineering and Industrial Computer Science Krakow Poland AGH University of Science and Technology Academic Centre For Materials and Nanotechnology Krakow Poland

A series of multiphase high-entropy alloys, AlCrFe2Ni2Mox (x=0.00-0.64), was subjected to electrochemical tests in 0.1 M H2SO4 solution to assess differences in corrosion resistance and passive film properties. Mo addition caused significant changes in alloy microstructure and improved the corrosion resistance of unpolarised samples. The nature of corrosion processes occurring on the surface of the polarised AlCrFe2Ni2Mox alloys appeared not consistent with the descriptions available in the literature. In particular, it has been demonstrated that the (Al, Ni)-rich BCC-B2 phase is not susceptible to corrosion during potentiodynamic polarisation but only after removal of the passive film. © 2022, The Authors. All rights reserved.

关键词： Corrosion resistance

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Corrosion Behaviour of Alcrfe2ni2mox High-Entropy Alloys in Sulphuric Acid Solution

SSRN

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SSRN 2022年

关键词： Corrosion resistance

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Synergistic eigenanalysis of covariance and Hessian matrices for enhanced binary classification on health datasets

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computers in Biology and Medicine 2025年 190卷 109985-109985页

作者： Hartoyo, Agus Argasiński, Jan Trenk, Aleksandra Przybylska, Kinga Blasiak, Anna Crimi, Alessandro Sano – Centre for Computational Personalised Medicine International Research Foundation Krakow Poland Department of Neurophysiology and Chronobiology Institute of Zoology and Biomedical Research Faculty of Biology Jagiellonian University Krakow Poland AGH University of Krakow Krakow Poland School of Computing Telkom University Bandung Indonesia Department of Human-Centered Artificial Intelligence Institute of Applied Computer Science Faculty of Physics Astronomy and Applied Computer Science Jagiellonian University Krakow Poland Doctoral School of Exact and Natural Sciences Jagiellonian University Krakow Poland

Covariance and Hessian matrices have been analyzed separately in the literature for classification problems. However, integrating these matrices has the potential to enhance their combined power in improving classification performance. We present a novel approach that combines the eigenanalysis of a covariance matrix evaluated on a training set with a Hessian matrix evaluated on a deep learning model to achieve optimal class separability in binary classification tasks. Our approach is substantiated by formal proofs that establish its capability to maximize between-class mean distance (the concept of separation) and minimize within-class variances (the concept of compactness), which together define the two linear discriminant analysis (LDA) criteria, particularly under ideal data conditions such as isotropy around class means and dominant leading eigenvalues. By projecting data into the combined space of the most relevant eigendirections from both matrices, we achieve optimal class separability as per these LDA criteria. Empirical validation across neural and health datasets consistently supports our theoretical framework and demonstrates that our method outperforms established methods. Our method stands out by addressing both separation and compactness criteria, unlike PCA and the Hessian method, which predominantly emphasize one criterion each. This comprehensive approach captures intricate patterns and relationships, enhancing classification performance. Furthermore, through the utilization of both LDA criteria, our method outperforms LDA itself by leveraging higher-dimensional feature spaces, in accordance with Cover's theorem, which favors linear separability in higher dimensions. Additionally, our approach sheds light on complex DNN decision-making, rendering them comprehensible within a 2D space. © 2025

关键词： Covariance matrix

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Collective excitations of a Bose-condensed gas: Fate of second sound in the crossover regime between hydrodynamic and collisionless regimes

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Physical Review A 2024年第3期109卷 033302-033302页

作者： Hoshu Hiyane Shohei Watabe Tetsuro Nikuni Quantum Systems Unit Okinawa Institute of Science and Technology Graduate University Onna Okinawa 904-0495 Japan Department of Physics Tokyo University of Science Shinjuku Tokyo 162-8601 Japan Faculty of Engineering Computer Science and Engineering Shibaura Institute of Technology Toyosu Tokyo 135-8548 Japan

We develop the moment method for Bose-Einstein condensates at finite temperatures that enable us to study collective sound modes from the hydrodynamic to the collisionless regime. In particular, we investigate collective excitations in a weakly interacting dilute Bose gas by applying the moment method to the Zaremba-Nikuni-Griffin equation, which is the coupled equation of the Boltzmann equation with the generalized Gross-Pitaevskii equation. Utilizing the moment method, collective excitations in the crossover regime between the hydrodynamic and collisionless regimes are investigated in detail. In the crossover regime, the second sound mode loses the weight of the density response function because of the significant coupling with incoherent modes, whereas the first sound shows a distinct but broad peak structure. We compare the result obtained by the moment method with that of the Landau two-fluid equations and show that the collective mode predicted by the Landau two-fluid equations well coincides with the result from the moment method even far from the hydrodynamic regime, whereas clear distinction also emerges in the relatively higher momentum regime.

关键词： Bose-Einstein condensates Cold atoms & matter waves

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A Novel Phase Shifter for 5G Base Station Antenna 7

A Novel Phase Shifter for 5G Base Station Antenna

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7th World Conference on Computing and Communication Technologies, WCCCT 2024

作者： Du, Lin Feng, Botao Ding, Xiao Gu, Wenzhe Sun, Sanshan Deng, Li Shenzhen University College of Electronics and Information Engineering Shenzhen518060 China Macau University of Science and Technology Faculty of Humanities and Arts 999078 China Huizhou University School of Computer Science and Engineering Huizhou516007 China Sichuan Normal University College of Physics and Electronic Engineering Sichuan China Beijing University of Posts and Telecommunications College of Information and Communication Engineering Beijing China

ISBN: (纸本)9798350372328

In this paper, a phase shifter for the base station antenna with low cost, ease of manufacturing and good performance on phase shift is presented. The phase shifter consists of a metal shell, a substrate, two dielectric plates, and two conductor lines. The phase shift is realized by moving the dielectric plates longitudinally, which cover the conductor lines. With the slots in dielectric materials, the slotted part of dielectric plates can function similarly to a quarter-wavelength impedance matching. Therefore, the function of this phase shifter is that the voltage standing wave ratio (VSWR) and power distribution ratio can be guaranteed when the dielectric plate is moved. The phase shifter exhibits a bandwidth of 1.7-2.1 GHz and the corresponding phase shift is 86.88° when the dielectric plate moves by 90 mm. Moreover, its good physical features including light weight, low cost, and easy fabrication make it well suitable for base station antenna applications. © 2024 IEEE.

关键词： Phase shifters

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A Comparative Study of LSTM, GRU, BiLSTM and BiGRU to Predict Dissolved Oxygen

A Comparative Study of LSTM, GRU, BiLSTM and BiGRU to Predic...

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International Joint Conference on computer science and Software Engineering (JCSSE)

作者： Narongsak Putpuek Apiradee Putpuek Apichart Sungthong Department of Information Technology Faculty of Science and Technology Rajabhat Rajanagarindra University Chachoengsao Thailand Department of Applied Physics Faculty of Science and Technology Rajabhat Rajanagarindra University Chachoengsao Thailand

In aquaculture, dissolved oxygen (DO) levels affect fish growth and survival. Automated monitoring and prediction of DO is challenging and becomes expensive if unnecessary sensors are used. This study aims to identify the optimal water and environmental parameters for DO prediction. Data from the fishpond station of Rajabhat Rajanagarindra university were pre-processed and used for training using LSTM, GRU, BiLSTM, and BiGRU. The performance of the models was evaluated and contrasted using three error measures. The results showed that GRU gave the best performance compared to the other models. In conclusion, the best parameters for DO prediction are water pH and water temperature.

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Enhanced Quantum Search via Partial Diffusion and Entanglement with Linear Optics

Enhanced Quantum Search via Partial Diffusion and Entangleme...

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National Conference on Radio science (NSRC)

作者： Ahmed S. El Fiky Ahmed Younes A. R. Abdulghany Salah S. A. Obayya Salem F. Hegazy Physics Department Faculty of Science Cairo University Giza Egypt Center for Photonics and Smart Materials Zewail City of Science and Technology Giza Egypt Department of Mathematics and Computer Science Faculty of Science Alexandria University Alexandria Egypt Faculty of Computer Science & Engineering Alamein International University Egypt National Institute of Laser Enhanced Sciences Cairo University Giza Egypt

ISBN: (数字)9798331535261

ISBN: (纸本)9798331535278

Searching for specific items in an unstructured database presents a vital computational problem. While the best-known classical search algorithm in a database of size $N$ has a complexity $\mathrm{O}(N)$ , Grover's quantum search algorithm exhibits a complexity $\mathrm{O}(\sqrt{N})$ , featuring a quadratic speed-up. In this paper, we present an optical system that implements an enhanced version of the search algorithm proposed by Younis et al. The system uses linear optical components such as beam splitters, phase shifters, and wave plates, along with a single-photon source and photodetectors.

关键词： Polarization Optical polarization Quantum entanglement Databases Stimulated emission Qubit Search problems Encoding Complexity theory Photonics

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A CH9 Low-Profile Circularly-Polarized Antenna for Indoor Positioning 7

A CH9 Low-Profile Circularly-Polarized Antenna for Indoor Po...

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7th World Conference on Computing and Communication Technologies, WCCCT 2024

作者： Zhang, Zhenfeng Feng, Botao Gu, Wenzhe Ding, Xiao Sun, Sanshan Deng, Li Shenzhen University College of Electronics and Information Engineering Shenzhen518060 China Huizhou University School of Computer Science and Engineering Huizhou516007 China Macau University of Science and Technology Faculty of Humanities and Arts 999078 China Sichuan Normal University College of Physics and Electronic Engineering Sichuan China Beijing University of Posts and Telecommunications College of Information and Communication Engineering Beijing China

ISBN: (纸本)9798350372328

This paper presents a low-profile CH9 circularly polarized 3-element multiple input multiple output (MIMO) antenna for precise positioning applications. The feeding structure of the antenna employs a conventional wilkinson power divider to achieve circular polarization, where the feeding structure and the radiating patch are located on the same layer of the dielectric substrate with a grounded backside. The -10-dB bandwidth of each antenna element ranges from 7.04 to 8.55 GHz, with a gain larger than 2.21 dBi within the desired bandwidth. In order to enhance localization accuracy and minimize the impact of spatial correlation, the distance interval between antenna elements is designed to be 12.5 mm. Experimental results show that when ports 1, 2 and 3 are excited with equal amplitude phase differences of 0 °, 90 ° and -90 °, respectively, the frequency bandwidth of the MIMO antenna is ranging from 7.61 to 8.48 GHz, with corresponding gain fluctuating from 5.39 to 8.07 dBi. In addition, the circularly polarized bandwidth is from 7 to 8.89 GHz, which fully covers the CH9 frequency band. © 2024 IEEE.

关键词： Bandwidth

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