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Microgravity analysis of periodic oscillations of heat and mass transfer of Darcy-Forchheimer nanofluid along radiating stretching surface with Joule heating effects

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Results in physics 2024年 62卷

作者： Ullah, Zia El-Zahar, Essam. R. Seddek, Laila F. Eladeb, Aboulbaba Kolsi, Lioua Alsharari, Abdulrhman M. Asad, Jihad Akgül, Ali Department of Mathematics and Statistics The University of Lahore Sargodha-Campus Sargodha 40100 Pakistan Department of Mathematics College of Science and Humanities in Al-Kharj Prince Sattam Bin Abdulaziz University P.O. Box 83 Al-Kharj 11942 Saudi Arabia Department of Basic Engineering Science Faculty of Engineering Menoufia University Shebin El-Kom 32511 Egypt Department of Engineering Mathematics and Physics Faculty of Engineering Zagazig University Zagazig 44519 Egypt Department of Chemical and Materials Engineering College of Engineering Northern Border University P.O. Box 1321 Arar Saudi Arabia Department of Mechanical Engineering College of Engineering University of Ha'il Ha'il City Saudi Arabia Department of Physics University of Tabuk Tabuk 71491 Saudi Arabia Department of Physics Faculty of Applied Science Palestine Technical University Tulkarm P Kadoorie 305 Palestine Department of Computer Science and Mathematics Lebanese American University Beirut Lebanon Siirt University Art and Science Faculty Department of Mathematics Siirt 56100 Turkey

Reduced gravity impact on mixed convection flow plays a significant role for designing of electric-generating plants in space, unwanted effects of free convection, thermodynamic stability, space devices, surface tension and movement of nanoparticles. The novelty of present work is to find the impact of reduced gravity, Joule heating and thermal radiations on Darcy Forchheimer magnetized flow of nanofluid along the stretching porous sheet. The variable gravity is assumed as temperature dependent with maximum density and maximum density. The governing model is converted into convenient model to find physical thermo parameters. The primitive steady, real and imaginary equations are formed by using stokes and primitive transformations. To make programming algorithm in FORTRAN Lahey-90/95, the primitively terms are deduced in each equation. For tabular and numerical findings of steady velocity, temperature and concentration, the implicit form of finite difference approach is applied with Gaussian elimination method. The fluctuating skin friction, fluctuating heat transfer and fluctuating mass transfer are displayed by using steady outcomes in main formula. It is found that the magnitude of fluid velocity enhances as magnetic force, reduced gravity and Darcy Forchheimer parameter enhances. It is concluded that temperature distribution decreases as magnetic force enhances. It is noted that oscillating frequency in skin friction and heat transfer enhances as Schmidt number enhances. It is found that the maximum fluctuating layer in heat and mass transfer enhances as Prandtl number enhances. © 2024 The Author(s)

关键词： Darcy Forchheimer porous medium Heat and mass transfer Joule heating Magnetic field Microgravity Oscillatory flow Thermal radiations

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Montmorillonite-anchored magnetite nanocomposite for recovery of ammonium from stormwater and its reuse in adsorption of Sc3+

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Nanotechnology for Environmental Engineering 2021年第3期6卷 1-14页

作者： Song, Jianzhi Srivastava, Varsha Kohout, Tomas Sillanpää, Mika Sainio, Tuomo Department of Separation Science School of Engineering Science LUT University Sammonkatu 12 Mikkeli50130 Finland Department of Geosciences and Geography University of Helsinki Helsinki Finland Department of Chemical Engineering School of Mining Metallurgy and Chemical Engineering University of Johannesburg P. O. Box 17011 Doornfontein2028 South Africa School of Chemical and Metallurgical Engineering University of the Witwatersrand Johannesburg2050 South Africa Chemistry Department College of Science King Saud University Riyadh11451 Saudi Arabia Department of Biological and Chemical Engineering Aarhus University Nørrebrogade 44 Aarhus C8000 Denmark Faculty of Science and Technology School of Applied Physics University Kebangsaan Malaysia BangiSelangor43600 Malaysia Shoolini University SolanHimachal Pradesh173212 India

The treatment of stormwater to remove and recover nutrients has received increasing interest. The objective of this study was to develop a novel adsorbent that is easy to handle, has good adsorption capacity, and is economical to use. A novel nanocomposite of montmorillonite (MT)-anchored magnetite (Fe3O4) was synthesised by co-precipitation as an adsorbent for ammonium. The MT/Fe3O4 nanocomposite had pore sizes (3–13 nm) in the range of narrow mesopores. The dispersion of the anchored Fe3O4 was confirmed by transmission electron microscopy, scanning electron microscopy, and X-ray photoelectron spectroscopy (XPS). The nanocomposite exhibited higher affinity towards ammonium than the original MT. The Langmuir isotherm model was found to be the most suitable model to explain the ammonium adsorption behaviour of the nanocomposite. The maximum adsorption capacity for ammonium was 10.48 mg/g. The adsorption mechanism was a combination of ion exchange and electrostatic interaction. In an authentic stormwater sample, the synthesised adsorbent removed 64.2% of ammonium and reduced the amount of heavy metal contaminants including Mn, Ni, Cu and Zn. Furthermore, the ammonium loading on MT/Fe3O4 during adsorption functionalised the adsorbent surface. Additionally, the spent nanocomposite showed potential for rare earth elements (REEs) adsorption as a secondary application, especially for the selective adsorption of Sc3+. The versatile application of montmorillonite-anchored magnetite nanocomposite makes it a promising adsorbent for water treatment. Graphic abstract: [Figure not available: see fulltext.]. © 2021, The Author(s).

关键词： Magnetite

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Text Classification Accuracy Enhancement Using Deep Neural Networks

Text Classification Accuracy Enhancement Using Deep Neural N...

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Communication and Information technology (AICCIT), Al-Sadiq International Conference on

作者： Mobajjal Kadhim Najm Mustafa S. Aljumaily Ahmed Al-Khaleefa A. M. Ayal Dheyaa Abdulameer Mohammed Aqeel Luaibi Challoob Computer Engineering Department Faculty of Engineering Shahid Chamran University of Ahvaz Ahvaz Iran Electrical Engineering and Computer Science Department University of Tennessee Tennessee USA Department of Physics Faculty of Education University of Misan Maysan Iraq University of Misan Maysan Iraq Department of Computer Technical Engineering College of Information Technology Imam Ja’afar Al-Sadiq University Al-Muthanna Iraq Department of Computer Techniques Engineering1 Imam Al-Kadhum College (IKC) Baghdad Iraq

Machine-learning systems are part of the field of artificial intelligence that automatically learn models from data to make better decisions. Natural language processing (NLP), using object and learning approaches, performs well in statistical tasks, such as text classification or sentiment mining. Currently, in the field of natural language processing (NLP), various models, methods, and architectures have been proposed and a wide range of NLP tasks have been developed. Most natural language processing (NLP) problems can be formulated as classification problems (decide on the class of this object depending on the object and its context). In this field, machine learning methods and especially using neural network models are the most used. In this research, we propose a deep learning architecture for text classification that can influence model performance. The basic steps of this proposed method include text pre-processing (including sentence segmentation, punctuation, rooting, speech tagging, and vector conversion), text feature extraction, and LSTM algorithm-based classification model construction. The dataset used in this study is 20NewsGroup and IMDB. The evaluation results are provided in the form of MSE, Precision, Recall, Accuracy, and F-Measure evaluation criteria.

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On the linearity and stability of electrostatic structures based on the Schamel equation

arXiv

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arXiv 2024年

作者： Schamel, Hans Pelinovsky, Efim Flamarion, Marcelo V. Physikalisches Institut Universität Bayreuth Bayreuth95440 Germany Faculty of Informatics Mathematics and Computer Science HSE University Nizhny Novgorod603155 Russia Gaponov-Grekhov Institute of Applied Physics Nizhny Novgorod603122 Russia Departamento Ciencias—Sección Matemáticas Pontificia Universidad Católica del Perú Av. Universitaria 1801 Lima San Miguel15088 Peru

This paper contributes in the first part to the correct understanding of the linear limit in the Schamel equation (S-equation) from the perspective of structure formation in collisionless plasmas. The corresponding modes near equilibrium turn out to be nonlinear modes of the underlying microscopic Vlasov-Poisson (VP) system, for which particle trapping is essential and which propagate with one of the slow acoustic velocities. A simple shift of the electrostatic potential to a new pedestal leads to non-negativity and thus mitigates the positivity problem of the S-equation. The stability of a solitary electron hole (bright soliton), based on both the S-equation and an earlier transverse but limited VP instability analysis, exhibits marginal longitudinal stability and linear perturbations in the form of the asymmetric shift eigenmode of a solvable Schrödinger problem. This finding on the predominance of shift-mode perturbation thus provides a new clue for the general kinetic proof of the marginal stability and transversal instability of electrostatic structures including undisclosed potentials. Copyright © 2024, The Authors. All rights reserved.

关键词： Collisionless plasmas

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Enhanced Solar Energy Harvest in Dye-Sensitized Solar Cells Using Silver-Doped Tio2 Photoelectrodes Via Spray Pyrolysis

SSRN

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SSRN 2025年

作者： Sritharan, Piranave Senthilnanthanan, Meena Ravirajan, Punniamoorthy Velauthapillai, Dhayalan Kumara, Gamaralalage Rajanya Asoka Palanisamy, Balraju Department of Chemistry University of Jaffna Jaffna40000 Sri Lanka Clean Energy Research Laboratory Department of Physics University of Jaffna Jaffna40000 Sri Lanka Faculty of Engineering and Science Western Norway University of Applied Sciences P.O. Box 7030 Bergen5020 Norway National Institute of Fundamental Studies Hantana Road Kandy20000 Sri Lanka Department of Physics Coimbatore Institute of Technology Tamil Nadu Coimbatore641 014 India

This study focuses on doping TiO2 with trace amounts of Ag⁺ ions, employing spray pyrolysis to prepare the Ag-doped TiO2 photoelectrode for application in Dye-Sensitized Solar Cells (DSSCs). In this regard, Ag-doped TiO2 nanomaterials were initially synthesized through rapid steam hydrolysis of Titanium(IV) isopropoxide (TTIP) with varying concentrations (1, 3, 5, and 7 mmol%) of Silver nitrate (AgNO3) followed by hydrothermal treatment. Then, the synthesized nanomaterials were coated separately on FTO glass substrates via spray pyrolysis to prepare the corresponding photoelectrodes. The structural and optical characterizations of the synthesized nanomaterials confirmed the presence of TiO2 in pure anatase phase and enhanced light absorption, respectively. The morphological characterization of Ag-doped TiO2 nanomaterials revealed spherical shaped particles. Subsequently, the DSSCs were fabricated using Ruthenium-based N719 dye and imidazolium iodide/ triiodide redox couple as the sensitizer and electrolyte, respectively. Photovoltaic performances were evaluated under simulated solar irradiation (100 mW cm−2, 1 sun, AM 1.5). The optimized device with 3 mmol% Ag-doped TiO2 photoelectrode exhibited PCE (η) of 8.32%, which was about 13% greater than the device with un-doped TiO2 (η = 7.35%). The observed upsurge in PCE is due to the 10% increase in Jsc value resulting from enhancement in visible light absorption which was confirmed by UV-Visible spectroscopic analysis. Moreover, an improved electron transport in the Ag-doped TiO2 based device was confirmed by electrochemical impedance spectroscopic studies which is ascribed to the significant reduction in charge recombination. These findings demonstrate the potential of Ag-doped TiO2 for enhanced DSSC performance, offering a viable pathway for improving solar energy conversion efficiency. © 2025, The Authors. All rights reserved.

关键词： Light absorption

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Synergistic engineering of hole transport materials in perovskite solar cells

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InfoMat 2020年第5期2卷 928-941页

作者： Sally Mabrouk Behzad Bahrami Hytham Elbohy Khan Mamun Reza Ashim Gurung Mao Liang Fan Wu Mingtai Wang Shangfeng Yang Qiquan Qiao Center for Advanced Photovoltaics Department of Electrical Engineering and Computer ScienceSouth Dakota State UniversityBrookingsSouth Dakota Physics Department Damietta UniversityNew Damietta CityEgypt Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion Department of Applied ChemistryTianjin University of TechnologyTianjinChina Key Lab of Optoelectronic Materials and Devices School of ScienceHuzhou UniversityHuzhouChina Institute of Applied Technology Hefei Institutes of Physical ScienceChinese Academy of SciencesHefeiChina Hefei National Laboratory for Physical Sciences at Microscale CAS Key Laboratory of Materials for Energy ConversionDepartment of Materials Science and EngineeringSynergetic Innovation Center of Quantum Information and Quantum PhysicsUniversity of Science and Technology of ChinaHefeiChina

In this work,methylammonium lead triiodide(CH3NH3PbI3)perovskite solar cells with efficiencies higher than 18%were achieved using a new nanocomposite hole transport layer(HTL)by doping poly(ethylenedioxythiophene):poly(styrene sulfonate)(PEDOT:PSS)with a mixed dopant of polyaniline(PANI)and graphene oxide(GO).A synergistic engineering between GO,PANI,and PEDOT:PSS was accomplished to introduce additional energy levels between perovskite and PEDOT:PSS and increase the conductivity of PEDOT:*** probe force microscope results confirmed that adding GO to PEDOT:PSS/PANI composite significantly reduced the average surface *** increased the open circuit voltage(Voc)to 1.05 V for the GO/PEDOT:PSS/PANI nanocomposite perovskite solar cells from the pristine PEDOT:PSS(Voc=0.95 V)and PEDOT:PSS/PANI(Voc=0.99 V).In addition,adding PANI to the HTLs substantially enhanced short circuit current density(Jsc).This was supported by the current sensing-atomic force microscopy(CS-AFM)and conductivity *** PANI doped films showed superior electrical conductivity compared with those without PANI as indicated by CS-AFM *** can fill the gaps between the microflakes of GO and give rise to more compact hole transport material(HTM)*** led to a higher Jsc after doping with PANI,which was consistent with the incident photon-to-current efficiency and electrochemical impedance spectroscopy *** results of X-ray diffraction(XRD)and AFM indicated the GO/PANI doped HTMs significantly improved the crystallinity,topography,and crystal size of the perovskite film grown on their surface.A higher efficiency of 18.12%for p-i-n perovskite solar cells has been obtained by adding the mixed dopant of GO,PANI,and PEDOT:PSS,demonstrating better stability than the pristine PEDOT:PSS cell.

关键词： composite hole transport material perovskite solar cell polyaniline and graphene oxide

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Entanglement wedge method, out-of-time-ordered correlators, and pole skipping

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Physical Review D 2025年第10期111卷 106013-106013页

作者： Banashree Baishya Adrita Chakraborty Nibedita Padhi Department of Physics Indian Institute of Technology Guwahati Assam-781039 India Faculty of Physics and Applied Computer Science AGH University of Krakow al. Adama Mickiewicza 30 30-059 Krakow Poland Department of Physics Indian Institute of Technology Kharagpur Kharagpur 721302 India

We investigate two salient chaotic features, namely Lyapunov exponent and butterfly velocity, for an asymptotically Lifshitz black hole background with arbitrary dynamical critical exponent. These features are computed using three methods: entanglement wedge method, out-of-time-ordered correlator computation, and pole skipping. We present a comparative study where all of these methods yield exactly similar results for the butterfly velocity and Lyapunov exponent. This establishes an equivalence between all three methods for probing chaos in the chosen gravity background. Furthermore, we evaluate the chaos at the classical level by computing the eikonal phase and Lyapunov exponent from the bulk gravity. In the classical approach, we comment on potential limitations while choosing the turning point of the null geodesic in our gravity background. All chaotic properties emerge as nontrivial functions of the anisotropy index. By examining the classical eikonal phase, we uncover different scattering scenarios in the near-horizon and near-boundary regimes. Finally, we remark on a possible classical/quantum correspondence from the analysis of classical eikonal phase shift and Lyapunov exponent.

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Evaluation of the X-ray SOI pixel detector with the on-chip ADC

arXiv

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arXiv 2024年

作者： Matsuhashi, Hiroumi Hagino, Kouichi Bamba, Aya Takeda, Ayaki Yukumoto, Masataka Mori, Koji Nishioka, Yusuke Tsuru, Takeshi Go Uenomachi, Mizuki Ikeda, Tomonori Matsuda, Masamune Narita, Takuto Suzuki, Hiromasa Tanaka, Takaaki Kurachi, Ikuo Kohmura, Takayoshi Uchida, Yusuke Arai, Yasuo Kawahito, Shoji Department of Physics University of Tokyo 7-3-1 Hongo Bunkyo Tokyo113-0033 Japan Department of Applied Physics Faculty of Engineering University of Miyazaki 1-1 Gakuen-Kibanadai-Nishi Miyazaki889-2192 Japan Department of Physics Graduate School of Science Kyoto University Kitashirakawa Oiwake-cho Sakyo-ku Kyoto606-8502 Japan Institute of Space and Astronautical Science Japan Aerospace Exploration Agency 3-1-1 Yoshinodai Chuo-ku Kanagawa Sagamihara252-5210 Japan Department of Physics Faculty of Science and Engineering Konan University 8-9-1 Okamoto Higashinada Hyogo Kobe658-8501 Japan D&S Inc. 774-3-213 Higashiasakawacho Hachioji Tokyo193-0834 Japan Department of Physics Faculty of Science and Technology Tokyo University of Science 2641 Yamazaki Noda Chiba278-8510 Japan Institute of Particle and Nuclear Studies High Energy Accelerator Research Org. KEK 1-1 Oho Tsukuba305-0801 Japan Research Institute of Electronics Shizuoka University Johoku 3-5-1 Naka-ku Shizuoka Hamamatsu432-8011 Japan

XRPIX is the monolithic X-ray SOI (silicon-on-insulator) pixel detector, which has a time resolution better than 10 µs as well as a high detection efficiency for X-rays above 10 keV. XRPIX is planned to be installed on future X-ray satellites. To mount on satellites, it is essential that the ADC (analog-to-digital converter) be implemented on the detector because such peripheral circuits must be as compact as possible to achieve a large imaging area in the limited space in satellites. Thus, we developed a new XRPIX device with the on-chip ADC, and evaluated its performances. As the results, the integral non-linearity was evaluated to be 6 LSB (least significant bit), equivalent to 36 eV. The differential non-linearity was less than 0.7 LSB, and input noise from the on-chip ADC was 5 e−. Also, we evaluated end-to-end performance including the sensor part as well as the on-chip ADC. As the results, energy resolution at 5.9 keV was 294 ± 4 eV in full-width at half maximum for the best pixel. © 2024, CC BY-NC-ND.

关键词： Pixels

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Biased dynamics of the miscible-immiscible quantum phase transition in a binary Bose-Einstein condensate

arXiv

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arXiv 2023年

作者： Bayocboc, Francis A. Dziarmaga, Jacek Zurek, Wojciech H. Jagiellonian University Faculty of Physics Astronomy and Applied Computer Science Institute of Theoretical Physics ul. Lojasiewicza 11 Kraków30-348 Poland Jagiellonian University Mark Kac Center for Complex Systems Research ul. Lojasiewicza 11 Kraków30-348 Poland Theory Division Los Alamos National Laboratory Los AlamosNM87545 United States

A quantum phase transition from the miscible to the immiscible phase of a quasi-one-dimensional binary Bose-Einstein condensate is driven by ramping down the coupling amplitude of its two hyperfine states. It results in a random pattern of spatial domains where the symmetry is broken separated by defects. In distinction to previous studies [J. Sabbatini et al., Phys. Rev. Lett. 107, 230402 (2011), New J. Phys. 14 095030 (2012)], we include nonzero detuning between the light field and the energy difference of the states, which provides a bias towards one of the states. Using the truncated Wigner method, we test the biased version of the quantum Kibble-Zurek mechanism [M. Rams et al., Phys. Rev. Lett. 123, 130603 (2019)] and observe a crossover to the adiabatic regime when the quench is sufficiently fast to dominate the effect of the bias. We verify a universal power law for the population imbalance in the nonadiabatic regime both at the critical point and by the end of the ramp. Shrinking and annihilation of domains of the unfavourable phase after the ramp, that is, already in the broken symmetry phase, enlarges the defect-free sections by the end of the ramp. The consequences of this phase-ordering effect can be captured by a phenomenological power law. © 2023, CC BY.

关键词： Annihilation

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Magnetic phase diagram and possible Kitaev-like behavior of the honeycomb-lattice antimonate Na3Co2SbO6

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Physical Review B 2023年第5期107卷 054411-054411页

作者： E. Vavilova T. Vasilchikova A. Vasiliev D. Mikhailova V. Nalbandyan E. Zvereva S. V. Streltsov Zavoisky Physical-Technical Institute of the Kazan Scientific Center of the Russian Academy of Sciences 420029 Kazan Russia Faculty of Physics Moscow State University Moscow 119991 Russia Laboratory of Functional Quantum Materials National University of Science and Technology “MISiS” Moscow 119049 Russia Institute for Complex Materials Leibniz Institute for Solid State and Materials Research (IFW) Dresden 01069 Dresden Germany Faculty of Chemistry Southern Federal University Rostov-on-Don 344090 Russia Institute of Metal Physics Ural Branch of the Russian Academy of Sciences Ekaterinburg 620137 Russia Department of Theoretical Physics and Applied Mathematics Ural Federal University Ekaterinburg 620002 Russia

Recent theoretical studies have suggested that Kitaev physics and such effects as formation of a mysterious spin-liquid state can be expected not only in α−RuCl3 and iridates, but also in conventional 3d transition metal compounds. Using dc and ac magnetometry, thermodynamic, and Na23 nuclear magnetic resonance (NMR) measurements we studied such a candidate material Na3Co2SbO6. A full phase diagram of Na3Co2SbO6 in a wide range of magnetic fields and temperatures is presented. The results demonstrate transformation of the antiferromagnetic structure under the external magnetic field, gradual development of the saturation phase, as well as evidence of gapped behavior in certain parts of the phase diagram.

关键词： Exotic phases of matter Magnetism Phase diagrams Quantum phase transitions Specific heat Spin dynamics Spin-orbit coupling Strongly correlated systems Magnetization measurements Nuclear magnetic resonance

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