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Critical pore radius and transport properties of disordered hard- and overlapping-sphere models

Physical Review E 2021年第1期104卷 014127-014127页

作者： Michael A. Klatt Robert M. Ziff Salvatore Torquato Department of Physics Princeton University Princeton New Jersey 08544 USA Institut für Theoretische Physik FAU Erlangen-Nürnberg Staudtstr. 7 91058 Erlangen Germany Center for the Study of Complex Systems and Department of Chemical Engineering University of Michigan Ann Arbor Michigan 48109 USA Department of Chemistry Princeton Institute for the Science and Technology of Materials and Program in Applied and Computational Mathematics Princeton University Princeton New Jersey 08544 USA

Transport properties of porous media are intimately linked to their pore-space microstructures. We quantify geometrical and topological descriptors of the pore space of certain disordered and ordered distributions of spheres, including pore-size functions and the critical pore radius δc. We focus on models of porous media derived from maximally random jammed sphere packings, overlapping spheres, equilibrium hard spheres, quantizer sphere packings, and crystalline sphere packings. For precise estimates of the percolation thresholds, we use a strict relation of the void percolation around sphere configurations to weighted bond percolation on the corresponding Voronoi networks. We use the Newman-Ziff algorithm to determine the percolation threshold using universal properties of the cluster size distribution. The critical pore radius δc is often used as the key characteristic length scale that determines the fluid permeability k. A recent study [Torquato, Adv. Wat. Resour. 140, 103565 (2020)] suggested for porous media with a well-connected pore space an alternative estimate of k based on the second moment of the pore size 〈δ2〉, which is easier to determine than δc. Here, we compare δc to the second moment of the pore size 〈δ2〉, and indeed confirm that, for all porosities and all models considered, δc2 is to a good approximation proportional to 〈δ2〉. However, unlike 〈δ2〉, the permeability estimate based on δc2 does not predict the correct ranking of k for our models. Thus, we confirm 〈δ2〉 to be a promising candidate for convenient and reliable estimates of the fluid permeability for porous media with a well-connected pore space. Moreover, we compare the fluid permeability of our models with varying degrees of order, as measured by the τ order metric. We find that (effectively) hyperuniform models tend to have lower values of k than their nonhyperuniform counterparts. Our findings could facilitate the design of porous media with desirable transport properties via targete

关键词： Geophysical networks Materials Patterns in complex systems

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Composing and characterization of barium strontium titanate film doped with carbon dot

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AIP Conference Proceedings 2024年第1期3027卷

作者： Irzaman Kenji Rizki Mayfarah Mahfuddin Zuhri Heriyanto Syafutra Noviyan Darmawan Erdiansyah Pratama Ridwan Siskandar Departement of Physics IPB University Bogor West Java 16680 Indonesia Departement of Chemistry IPB University Bogor West Java 16680 Indonesia PT. Global Pratama Powerindo Bandung West Java 40614 Indonesia Computer Engineering Study Program College of Vocational Studies IPB University Bogor West Java 16151 Indonesia

Barium Strontium Titanate (BaSrTiO3) film which was captured by carbon dot with variation container 0%, 2%, 4%, 6% using CSD method with the help of spin coating with a rotating speed of 8000 rpm has been successfully made on p-type silicon substrate 100. The film was annealed at 850 °C and held for 8 hours. Barium Strontium Titanate (BaSrTiO3) film at a concentration 0%, 2%, 4%, 6% carbon dot characterized by UV-VIS, XRD, SEM-EDX to produce bandgap energy in sequence 2.72 eV; 2.85 eV; 3.7 eV and 3.8 eV. The result of XRD characterization showed that the BST lattice structure is a cube with lattice parameters a=b=c in sequence of 4.066945 Å; 4.06868 Å; 4.072155 Å and 4.077379 Å. The result of SEM-EDX characterization showed that in the surface morphology of BST film the grain size was quite homogeneous and the corresponding atomic compositions obtained were Ba, Sr, Ti, O, and C

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The development of virtual laboratory on fluid materials 6

The development of virtual laboratory on fluid materials

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6th International Seminar on Mathematics, Science, and Computer Science Education, MSCEIS 2018

作者： Jannati, E.D. Setiawan, A. Siahaan, P. Rochman, C. Susanti, D. Samantha, Y. Mechanical Engineering Study Program Majalengka University Majalengka Indonesia Department of Mechanical Engineering Education Universitas Pendidikan Indonesia Bandung Indonesia Department of Physics Education Universitas Pendidikan Indonesia Bandung Indonesia Department of Physics Education UIN Sunan Gunung Djati Bandung Indonesia Department of Informatics Engineering Majalengka University Majalengka Indonesia

This study aims to study the development of laboratory learning media on the concept of fluids. The method used in this study is the research and development (R & D) method of implementation up to step 7, namely: (1) literature study, (2) needs analysis, (3) design of virtual lab learning media, (4) development of lab learning media virtual, (5) validation, (6) product testing, (7) product revision. Virtual laboratory learning media, have gone through a phase validation test by two material experts and one media expert who showed that laboratory learning media on fluid materials are feasible to be applied in learning. the results of sponsored pretest and posttest for students showed a significant increase. Recommended to be applied in a virtual learning laboratory is suitable to be applied in the Faculty of engineering, Majalengka University. © 2019 IOP Publishing Ltd.

关键词： Laboratories

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Roadmap on Nonlocality in Photonic Materials and Metamaterials

arXiv

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arXiv 2025年

作者： Monticone, Francesco Mortensen, N. Asger Fernández-Domínguez, Antonio I. Luo, Yu Tserkezis, Christos Khurgin, Jacob B. Shahbazyan, Tigran V. Chaves, André J. Peres, Nuno M.R. Wegner, Gino Busch, Kurt Hu, Huatian della Sala, Fabio Zhang, Pu Ciracì, Cristian Aizpurua, Javier Babaze, Antton Borisov, Andrei G. Chen, Xue-Wen Christensen, Thomas Yan, Wei Yang, Yi Hohenester, Ulrich Huber, Lorenz Wubs, Martijn de Liberato, Simone Gonçalves, P.A.D. de Abajo, F. Javier García Hess, Ortwin Tarasenko, Illya Cox, Joel D. Jelver, Line Dias, Eduardo J.C. Sánchez, Miguel Sánchez Margetis, Dionisios Gómez-Santos, Guillermo Stauber, Tobias Tretyakov, Sergei Simovski, Constantin Pakniyat, Samaneh Gómez-Díaz, J. Sebastián Bondarev, Igor V. Biehs, Svend-Age Boltasseva, Alexandra Shalaev, Vladimir M. Krasavin, Alexey V. Zayats, Anatoly V. Alù, Andrea Song, Jung-Hwan Brongersma, Mark L. Levy, Uriel Long, Olivia Y. Guo, Cheng Fan, Shanhui Bozhevolnyi, Sergey I. Overvig, Adam Prudêncio, Filipa R. Silveirinha, Mário G. Gangaraj, S. Ali Hassani Argyropoulos, Christos Huidobro, Paloma A. Galiffi, Emanuele Yang, Fan Pendry, John B. Miller, David A.B. School of Electrical and Computer Engineering Cornell University IthacaNY14853 United States POLIMA Center for Polariton-driven Light–Matter Interactions University of Southern Denmark Campusvej 55 Odense MDK-5230 Denmark D-IAS—Danish Institute for Advanced Study University of Southern Denmark Campusvej 55 Odense MDK-5230 Denmark Departamento de Física Teórica de la Materia Condensada Universidad Autónoma de Madrid MadridE-28049 Spain Universidad Autónoma de Madrid MadridE-28049 Spain School of Electrical and Electronic Engineering Nanyang Technological University Singapore639798 Singapore Key Laboratory of Radar Imaging and Microwave Photonics Ministry of Education College of Electronic and Information Engineering Nanjing University of Aeronautics and Astronautics Nanjing211106 China Department of Electrical and Computer Engineering Johns Hopkins University BaltimoreMD21218 United States Department of Physics Jackson State University JacksonMS39217 United States Department of Physics Aeronautics Institute of Technology SP So Jos dos Campos12228-900 Brazil Departamento de Física Universidade do Minho BragaP-4710-057 Portugal Av Mestre José Veiga Braga4715-330 Portugal Max-Born-Institut Berlin12489 Germany Humboldt-Universität zu Berlin Institut für Physik AG Theoretische Optik and Photonik Berlin12489 Germany Center for Biomolecular Nanotechnologies Istituto Italiano di Tecnologia Via Barsanti 14 Arnesano73010 Italy Via Monteroni Campus Unisalento Lecce73100 Italy School of physics Huazhong University of Science and Technology Luoyu Road 1037 Wuhan430074 China Donostia International Physics Center DIPC Donostia-San Sebastián20018 Spain Ikerbasque Basque Foundation for Science Bilbao48009 Spain Department of Electricity and Electronics University of the Basque Country Leioa48940 Spain Department of Applied Physics University of the Basque Country Donostia20018 Spain Université Paris-Saclay CNRS Institut des Scienc

Photonic technologies continue to drive the quest for new optical materials with unprecedented responses. A major frontier in this field is the exploration of nonlocal (spatially dispersive) materials, going beyond the local, wavevector-independent assumption traditionally made in optical material modeling. On one end, the growing interest in plasmonic, polaritonic and quantum materials has revealed naturally occurring nonlocalities, emphasizing the need for more accurate models to predict and design their optical responses. This has major implications also for topological, nonreciprocal, and time-varying systems based on these material platforms. Beyond natural materials, artificially structured materials—metamaterials and metasurfaces–can provide even stronger and engineered nonlocal effects, emerging from long-range interactions or multipolar effects. This is a rapidly expanding area in the field of photonic metamaterials, with open frontiers yet to be explored. In the case of metasurfaces, in particular, nonlocality engineering has become a powerful tool for designing strongly wavevector-dependent responses, enabling enhanced wavefront control, spatial compression, multifunctional devices, and wave-based computing. Furthermore, nonlocality and related concepts play a critical role in defining the ultimate limits of what is possible in optics, photonics, and wave physics. This Roadmap aims to survey the most exciting developments in nonlocal photonic materials, highlight new opportunities and open challenges, and chart new pathways that will drive this emerging field forward–toward new scientific discoveries and technological advancements. Copyright © 2025, The Authors. All rights reserved.

关键词： Nanocrystals

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Tsunami evacution building model (TEBM) in Teluk Palu (Palu Bay) area

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IOP Conference Series: Materials Science and engineering 2022年第1期1212卷

作者： M Bakri R Awalia S Mulyati F Zubaidi M Rusydi A A Kasim R Prawita Department of Architecture Faculty of Engineering Tadulako University PaluIndonesia Department of Physics Faculty of Mathematics and Natural Sciences Tadulako University Palu Indonesia Department of Informatics Faculty of Engineering Tadulako University Palu Indonesia Study Program of Architecture Faculty of Engineering Tadulako University Palu Indonesia

The research was conducted in the coastal area of Palu Bay, Lere Village. Data were collected using observation, interviews, and literature study techniques. The data were analyzed using qualitative descriptive methods and focused on the concept of the design of the tsunami evacuation building on the coast of Palu Bay. Data analysis was carried out to obtain an overview of the problems that occurred at the planning location which was analyzed with the concept of architectural design by considering the existing conditions of the site and the surrounding environment, as well as utilizing the potential of the site so that it has the potential for building functions. The conclusion obtained is based on the results of data analysis, it is necessary to have a building that can function as an evacuation container for the community when a disaster occurs in the coastal area of Palu Bay, thereby reducing the number of casualties. The benefit of this research is that it is a solution for local people to save themselves when the tsunami disaster.

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Experimental study on capillarity and thermal of metal foam as the wick structure in heat pipe application

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AIP Conference Proceedings 2023年第1期2865卷

作者： Syahrul Humaidi Doli Bonardo Dahniar Hasibuan Perdamean Sebayang Achmad Maulana Soehada Post Graduate Program (Physics) FMIPA Universitas Sumatera Utara Jl. Bioteknologi I Kampus USU Medan 20155 Indonesia Refrigeration and Air Conditioning Engineering Study Program Politeknik Tanjungbalai Jl. Sei Raja Sei Tualang Raso Tanjungbalai 21345 Indonesia Research Center for Advanced Materials National Research and Innovation Agency (BRIN) Tangerang Selatan Banten 15314 Indonesia. Department of Physics Universitas Sutomo Serang Banten 42183 Indonesia

Metal foam as a wick structure in heat pipe applications is analyzed in terms of its capillary and thermal properties to determine the perspectives and challenges ahead. The surface coating of metal foam with a hydrophobic layer was analyzed for its effect on the overall capillarity in order to determine the optimal metal foam as a wick structure in the heat pipe. The hydrophobic coating is applied by a simple spray technique to the entire surface of the metal foam with repetition. Metal foam without a hydrophobic layer has stable capillarity properties among other samples, this indicates that the hydrophobic layer can inhibit the ferro fluid flow rate in the metal foam pore network as a whole as a result of the interaction between the metal foam phases and the hydrophobic layer. Metal foam 15 PPI without hydrophobic coating has an even and stable heat distribution, high conductivity and low resistivity which is suitable for application as a wick structure in heat pipes.

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Identification of the quality of premium and non-premium rice based on physical characteristics using artificial neural networks and digital image processing

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AIP Conference Proceedings 2024年第1期3065卷

作者： Endah Sekar Palupi Riries Rulaningtyas Toetik Rahayuningsih Ahmad Yudianto Department of Forensic Science Postgraduate School Department of Health Faculty of Vocational Studies Universitas Airlangga Surabaya Indonesia Biomedical Engineering Study Program Department of Physics Universitas Airlangga Surabaya Indonesia Criminal Law Department of Law Faculty of Law Universitas Airlangga Surabaya Indonesia Department of Forensic Medicine and Medicolegal Faculty of Medicine Universitas Airlangga Surabaya Indonesia

Counterfeiting of quality rice was rife in Indonesia. This research was conducted to develop technology to identify differences in premium and non-premium rice quality based on pre-existing digital images. Artificial neural networks and digital image processing methods to identify premium and medium (non-premium) rice quality were applied in this research. Statistical analysis of this study used the SPSS program. This research is observation-type research. This research design uses an artificial neural network with uses 3 layers, namely the results of shape feature extraction on the metric, eccentricity, area, and perimeter parameters as input or input layers, hidden or hidden layers, and premium rice and non-premium (medium) rice as output or output layers. This research uses 52 images as training and 20 images as testing. The obtained image was taken at a distance of 25 cm. This research showed that the results of training using artificial neural networks (ANN) on 52 images obtained an accuracy of 92%. The test results using 20 images obtained 95% accuracy, 63.33% sensitivity, and 10% specificity. Based on statistical analysis using the Mann-Whitney test, it obtained the asymph value. Sig (2-tailed) < 0.05 indicates the difference between premium and non-premium rice using metric, eccentricity, perimeter, and area parameters.

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The ternary Goldbach problem with a prime with a missing digit and primes of special types

arXiv

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arXiv 2021年

作者： Maier, Helmut Rassias, Michael Th. Department of Mathematics University of Ulm Helmholtzstrasse 18 Ulm89081 Germany Department of Mathematics and Engineering Sciences Hellenic Military Academy Vari Attikis16673 Greece Moscow Institute of Physics and Technology Institutskiy per d. 9 Dolgoprudny141700 Russia Institute for Advanced Study Program in Interdisciplinary Studies 1 Einstein Dr PrincetonNJ08540 United States

Let 'Equation Presented' Let γ∗0= 1/γ0 be fixed. Let also a0∈ {0,1, ⋯, 9}. In [23] we proved on assumption of the Generalized Riemann Hypothesis (GRH), that each sufficiently large odd integer N0can be represented in the form N0= p1+ p2+ p3, where for i = 2,3 the primes piare Piatetski-Shapiro primes - primes of the form pi= [nic0], ni∈ - whereas the decimal expansion of p1does not contain the digit a0. In this paper we replace one of the Piatetski-Shapiro primes p2and p3by primes of the type p = x2+ y2+ 1. Copyright © 2021, The Authors. All rights reserved.

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A first-principles study on the quantum tunneling of methylhydroxycarbene isomerization in various solvents 4

A first-principles study on the quantum tunneling of methylh...

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4th Padjadjaran International physics Symposium 2019, PIPS 2019

作者： Susanti, E.D. Rusydi, F. Puspitasari, I. Fadilla, R.N. Aisyah, N.D. Ahmad, A. Research Center for Quantum Engineering Design Faculty of Science and Technology Universitas Airlangga Jl. Mulyorejo Surabaya60115 Indonesia Department of Physics Faculty of Science and Technology Universitas Airlangga Jl. Mulyorejo Surabaya60115 Indonesia Precision Sciences and Technology and Applied Physics Graduate School of Engineering Osaka University Suita565-0871 Japan Information System Study Program Faculty of Science and Technology Universitas Airlangga Jl. Mulyorejo Surabaya60115 Indonesia School of Chemical Science and Food Technology Faculty of Science and Technology Universiti Kebangsaan Malaysia Bangi Selangor43600 Malaysia

Quantum tunneling phenomenon allows a high-barrier reaction to occur even though thermal energy is not sufficient to surmount the barrier. The phenomenon has been suggested to exist in the isomerization of methylhydroxycarbene which occured at 11 K. Here we study the quantum tunneling that occured in the isomerization of methylhydroxycarbene to acetaldehyde and to vinyl alcohol based on density functional calculations. The isomerization pathways are determined under the effect of various solvents which are modeled by polarizable continuum model (PCM). We use Wentzel-Kramers-Brillouin (WKB) approximation to calculate the tunneling probability (T) and extend the usefulness of T into isomerization rate. The results show that the solvents give a significant effect on the isomerization rate of methylhydroxycarbene to acetaldehyde but an insignificant one on the isomerization rate to vinyl alcohol. © 2020 IOP Publishing Ltd. All rights reserved.

关键词： Isomerization

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Bedrock identification using resistivity method at campus II of Universitas Syiah Kuala, Banda Aceh

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IOP Conference Series: Materials Science and engineering 2021年第1期1087卷

作者： M Syukri A M Taib Z Fadhli Physics Department Universitas Syiah Kuala Banda Aceh Indonesia Program Study of Geophysical Engineering Universitas Syiah Kuala Banda Aceh Indonesia

Research of resistivity method at campus II Universitas Syiah Kuala has been conducted with the SuperSting 68 instrument. There were three lines, each 330 meters long with a spacing of 6 meters. The purpose of the research was to determine the depth of the bedrock at campus II of Universitas Syiah Kuala. The results showed that there was a conductive and resistive coating with a resistivity value of between 2–1250 Ωm. The rock types were composed of water-saturated rocks, Tuffs sandstone, and andesite. The supposed bedrock rock is an andesite rock with a resistivity of 170-1250 Ωm with good density. In conclusion, the separation between the sediment and the bedrock was visible at a depth of up 10 meters across the measuring track.

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