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10th Asian Physics Symposium 2023, APS 2023

作者： Firdausyi, Alya Mutiara Dini, Septian Ulan Nurafni, Sevi Viridi, Sparisoma Master Program in Computational Science Faculty of Mathematics and Natural Sciences Institut Teknologi Bandung Bandung40132 Indonesia Master Program in Physics Faculty of Mathematics and Natural Sciences Institut Teknologi Bandung Bandung40132 Indonesia Department of Physics Faculty of Mathematics and Natural Sciences Institut Teknologi Bandung 40132 Indonesia

Good emergency management is essential in planning events that have the potential to endanger lives, one of which is preparing for an effective and efficient evacuation. Evacuation evaluation using a fire drill is not optimal because it does not describe the emergency. Therefore, agent-based modeling is carried out to see interactions between individuals and their environment during evacuation. ABM (Agent-Based Modeling) is combined with a social-force model, which is the source of the agent's movement style toward goals and avoiding obstacles. The simulation is carried out using NetLogo 6.3.0 software, which can represent agents spread across a 2-dimensional room with variations in room size, exits, and the number of agents involved. Several characteristics are given to the agent to cause heterogeneity, including age categories in the form of children, adults, people over 70, and people with disabilities, which will determine the agent's walking speed. The measurements observed were the average duration of evacuation and the average speed of agents. From the simulation results, it can be concluded that using the social force model will lead to the emergence of collective behavior, such as clogging and arching in agents. The exact population density in different room areas will affect the evacuation duration, whereas a larger room area will cause the agent to travel a greater distance to the exit. An increase in evacuation duration will accelerate rapidly at low densities and slow down as density increases. © Published under licence by IOP Publishing Ltd.

关键词： Population statistics

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Compressive Property of Biomass Briquettes Made of Hazelnut Shell and Peanut Shell 10

Compressive Property of Biomass Briquettes Made of Hazelnut ...

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10th Asian Physics Symposium 2023, APS 2023

作者： Gusnia, Yessi Aditya, Irfan Dwi Widayani Nuclear Physics and Biophysics Research Group Faculty of Mathematics and Natural Sciences Institut Teknologi Bandung Jalan Ganesha 10 Bandung40132 Indonesia Instrumentation and Computational Physics Research Group Faculty of Mathematics and Natural Sciences Institut Teknologi Bandung Jalan Ganesha 10 Bandung40132 Indonesia

In Indonesia, energy consumption increases as with its population, while fossil energy sources keep running out. This condition forces the development of non-fossil energy sources. One promising alternative is biomass briquette. In this study a biomass briquette was made using hazelnut shell (limbah cangkang kemiri CK) and peanut shell waste (kulit kacang tanah KT) with various CK concentrations: 0/24, 4/24, 8/24, 12/24, 16/24, 20/24, and 24/24 (w/w). Initially, dried CK and KT waste were processed into charcoal powder with a particle size of ∼ 0,25 mm. The briquette was prepared by densification of the two charcoal mixtures at a pressure of 29778,99 N/m2 for 15 min, followed by heating at 60 °C for 4 h. Due to storage and delivery process in the application, briquettes must have good compressive properties. In this study, compressive property of the produced briquette was characterized using a universal testing machine (UTM). The results showed that the values of ultimate strength, modulus of elasticity, and elongation at break of the CK-KT briquette increased with increasing CK concentration, with highest values of 5.69 MPa, 80 MPa and 0.146, respectively. © Published under licence by IOP Publishing Ltd.

关键词： Charcoal

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Synergetic effects of multiple junction and surface hydroxyl in Cu/CuO/Cu2O/TiO2 heterostructures towards highly efficient photocatalysts for hydrogen generation

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Materials Science for Energy Technologies 2025年 8卷 131-142页

作者： Subagyo, Riki Anindika, Garcelina Rizky Aufkani, Afif Akmal Zhang, Lei Ardhyananta, Hosta Burhan, R.Y. Perry Nugraheni, Zjahra Vianita Akhlus, Syafsir Bahruji, Hasliza Prasetyoko, Didik Wellia, Diana Vanda Ivansyah, Atthar Luqman Arramel Kusumawati, Yuly Department of Chemistry Faculty of Science and Analytic Data Institut Teknologi Sepuluh Nopember Surabaya60111 Indonesia Center of Excellence Applied Physics and Chemistry Nano Center Indonesia Jl PUSPIPTEK South Tangerang Banten15314 Indonesia Department of Physics National University of Singapore Singapore117551 Singapore Department of Materials and Metallurgical Engineering Faculty of Industrial Technology and Systems Engineering Institut Teknologi Sepuluh Nopember Surabaya60111 Indonesia Centre of Advanced Material and Energy Science Universiti Brunei Darussalam Jalan Tungku Link BE 1410 Brunei Department of Chemistry Faculty of Mathematics and Natural Sciences Universitas Andalas Padang25163 Indonesia Master Program in Computational Science Faculty of Mathematics and Natural Science Institut Teknologi Bandung Jalan Ganesha No. 10 Bandung40132 Indonesia Instrumentation and Computational Physics Research Group Department of Physics Faculty of Mathematics and Natural Sciences Institut Teknologi Bandung Jalan Ganesha No.10 West Java Bandung40132 Indonesia

The implementation of titanium dioxide (TiO2) as a photocatalyst material in hydrogen (H2) evolution reaction (HER) has embarked renewed interest in the past decade. Rapid electron-hole pairs recombination and wide band gap of a photo-sensitive material of TiO2 are detrimental toward the targeted catalytical reaction. In this study, we present the rational design, fabrication, photocatalytic performance of TiO2-Cu/CuO/Cu2O heterostructures (CuTi) using viable chemical reduction method. The Z-scheme and S-scheme are succesfully generated across the TiO2/CuO/Cu2O interfaces, while the Schottky junction arises on the Cu perimeters. This is evidenced from the blue shifted about 0.3 eV of Cu 2p core level determined by using X-ray photoemission spectroscopy (XPS), in combination with the formation of inverse V-shape of the Mott-Schottky plots. In addition, we find that Cu/CuO/Cu2O facilitates photon absorption range up to the visible region. The multiple heterojunction and the large number of OHsurface enhanced charge carrier transfer are associated to the suppression of photoluminescence (PL) intensity, high surface hydroxyl (OHsurface) density in CuTi probed by XPS, and fast electron transfer based on the electrochemical measurements. The presence of OHsurface inhibits the recombination of electron. A significant H2 photogeneration rate enhancement is achieved when an optimized 5 wt% Cu/CuO/Cu2O concentration is used on TiO2 to achieve 7,157.19 μmol·g−1 (1,789.30 μmol·g−1·h−1). Based on this finding, zero emission energy innitiative could be materialized under multiple heterojunctions in photocatalytic process is beneficial for enhancing the H2 production. © 2025 The Authors

关键词： Titanium dioxide

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Single-probe Near-field Phase Retrieval using On-The-Fly Scan and Hilbert Transform

Single-probe Near-field Phase Retrieval using On-The-Fly Sca...

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2023 International Symposium on Electromagnetic Compatibility - EMC Europe, EMC Europe 2023

作者： Yang, Cheng Adam, Christian Gotschel, Sebastian Hamburg University of Technology Institut für Theoretische Elektrotechnik Hamburg Germany Hamburg University of Technology Institute for Integrated Circuits Hamburg Germany Hamburg University of Technology Computational Mathematics Institute of Mathematics Hamburg Germany

ISBN: (纸本)9798350324006

A novel near-field measurement method is proposed for fast phase retrieval using a single probe. The method is based on a new understanding of the on-the-fly (OTF) scan process as a spatio-temporal sampling operation of near-field responses. As a result, the near-field measurement is interpreted as a signal modulation of a source signal and a variable spatio-temporal function defined by the field responses and the motion of the probe. To retrieve the complex field responses, the Hilbert Transform (HT) is utilized for envelope and phase demodulation of signals recorded by an oscilloscope. To demonstrate the proof of concept, both numerical and experimental examples are provided with a detailed description of the method implementation. Measurement-to-measurement correlations at 125 kHz are conducted using a six-axis industry robot with multiple probes and instruments, showing its efficiency, effectiveness, and flexibility. Compared to conventional near-field measurement methods, the proposed method allows 90% reduction of measurement time and achieves a relative accuracy of phase retrieval above 96% with a simplified measurement setup, opening up new opportunities for near-field measurement applications. © 2023 IEEE.

关键词： Probes

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New insight into pyrrolic-N site effect towards the first NIR window absorption of pyrrolic-N-rich carbon dots

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Nano Research 2023年第4期16卷 6001-6009页

作者： Fitri Aulia Permatasari Reza Umami Citra Deliana Dewi Sundari Tirta Rona Mayangsari Atthar Luqman Ivansyah Fahdzi Muttaqien Takashi Ogi Ferry Iskandar Department of Physics Faculty Mathematics and Natural SciencesInstitut Teknologi BandungJalan Ganesha 10BandungWest Java 40132Indonesia Collaboration Research Center for Advanced Energy Materials National Research and Innovation Agency-Institut Teknologi BandungJalan Ganesha 10BandungWest Java 40132Indonesia Department of Chemistry Faculty of Mathematics and Natural SciencesInstitut Teknologi BandungJl.Ganesha 10BandungWest Java 40132Indonesia Department of Chemistry Education UIN Sunan Gunung Djati BandungJl.CimincrangBandungWest Java 40292Indonesia Department of Chemistry Universitas PertaminaJakarta 12220Indonesia Master Program in Computational Science Faculty of Mathematics and Natural SciencesInstitut Teknologi BandungJl.Ganesha 10BandungWest Java 40132Indonesia Instrumentation and Computational Physics Research Group Faculty of Mathematics and Natural SciencesInstitut Teknologi BandungJl.Ganesha 10Bandung 40132Indonesia Research Center for Nanoscience and Nanotechnology Institut Teknologi BandungJalan Ganesha 10BandungWest Java 40132Indonesia Chemical Engineering Program Department of Advanced Science and EngineeringGraduate School of Advanced Science and EngineeringHiroshima UniversityHigashi-Hiroshima 739-8527Japan

Controlled C-N configurations,i.e.,pyrrolic-N,pyridinic-N,and graphitic-N,are promising strategies to tailor the carbon dots’(CDs)optical properties into the first near infrared(NIR)window(650-900 nm),a responsive range for biomedical ***,a deep understanding of the role of the C-N configuration in the CDs’properties is still challenging and thoughtprovoking owing to their complex ***,an underlying pyrrolic-N concentration and position effect on the pyrrolic-N-rich CDs’absorption was comprehensively elucidated based on the integrated experimental and computational *** assynthesized pyrrolic-N-rich CDs exhibit a first NIR window absorption centered at 650 nm with high photothermal ***-N concentrations from 1.4%to 11.3%and positions(edge and mid-site)were systematically investigated.A mid-site pyrrolic-N was subsequently generated after the pyrrolic-N concentration more than 10%.Edge-site pyrrolic-N induces a frontier orbital hybridization,reducing bandgap energy,while mid-site pyrrolic-N plays a critical role in inducing a first NIR window absorption owing to their high charge ***,pyrrolic-N-rich CDs inherit a bowl-like topological feature,elevating the CDs’layer thickness as much as 0.71 *** study shed light on the design and optimization of pyrrolic-N on CDs for the first NIR window responsive materials in any biomedical application.

关键词： absorption carbon dots charge transfer first near infrared(NIR)window frontier orbital hybridization mid-site pyrrolic-N

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Strong Completeness Of A Class Of L²(T)-Type Riesz Spaces

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Proceedings of the American Mathematical Society, Series B 2024年第23期11卷 243-253页

作者： Kalauch, Anke Kuo, Wen-Chi Watson, Bruce A. Institut fur Analysis FR Mathematik TU Dresden Dresden D-01062 Germany School of Mathematics University of the Witwatersrand National Institute for Theoretical and Computational Sciences (NITheCS) Private Bag 3 P O Johannesburg 2050 South Africa

The L p , 1 ≤ p ≤ ∞ L^{p}, 1\le p\le \infty , spaces have been generalized to the setting of Riesz spaces as L p (T) {L}^{p}(T) spaces, on which there are R (T) R(T) -valued norms. The strong sequential completeness of the space L 1 (T) {L}^{1}(T) and the strong completeness of L ∞ (T) {L}^{\infty }(T) with resepct to their respective R (T) R(T) -valued norms were established by Kuo, Rodda, and Watson. In the current work, the T T -strong completeness of L 2 (T) {L}^{2}(T) is established via the Riesz–Fischer type theorem given by Kalauch, Kuo, and Watson. It is also shown that the conditional expectation operator T T is a weak order unit for the T T -strong dual. © 2024, American Mathematical Society. All rights reserved.

关键词： Riesz spaces conditional expectation operators order convergence completeness

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COUPLER CURVES OF MOVING GRAPHS AND COUNTING REALIZATIONS OF RIGID GRAPHS

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mathematics of Computation 2024年第345期93卷 459-504页

作者： Grasegger, Georg El Hilany, Boulos Lubbes, Niels Johann Radon Institute for Computational and Applied Mathematics (RICAM) Austrian Academy of Sciences Altenberger Straße 69 Linz 4040 Austria Institut für Analysis und Algebra TU Braunschweig Universitätsplatz 2 Braunschweig 38106 Germany

A calligraph is a graph that for almost all edge length assignments moves with one degree of freedom in the plane, if we fix an edge and consider the vertices as revolute joints. The trajectory of a distinguished vertex of the calligraph is called its coupler curve. To each calligraph we uniquely assign a vector consisting of three integers. This vector bounds the degrees and geometric genera of irreducible components of the coupler curve. A graph, that up to rotations and translations admits finitely many, but at least two, realizations into the plane for almost all edge length assignments, is a union of two calligraphs. We show that this number of realizations is equal to a certain inner product of the vectors associated to these two calligraphs. As an application we obtain an improved algorithm for counting numbers of realizations, and by counting realizations we characterize invariants of coupler curves. © 2023 American Mathematical Society

关键词： algebraic series of planar curves coupler curves divisor classes infinitely near base points Laman graphs Minimally rigid graphs number of realizations

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Efficient numerical methods for the Maxey-Riley-Gatignol equations with Basset history term

arXiv

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arXiv 2024年

作者： Urizarna-Carasa, Julio Schlegel, Leon Ruprecht, Daniel Lehrstuhl Computational Mathematics Institut für Mathematik Technische Universität Hamburg Germany

The Maxey-Riley-Gatignol equations (MRGE) describe the motion of a finite-sized, spherical particle in a fluid. Because of wake effects, the force acting on a particle depends on its past trajectory. This is modelled by an integral term in the MRGE, also called Basset force, that makes its numerical solution challenging and memory intensive. A recent approach proposed by [S. G. Prasath, V. Vasan, R. Govindarajan, Accurate solution method for the Maxey–Riley equation, and the effects of Basset history, Journal of Fluid Mechanics 868 (2019) 428–460] exploits connections between the integral term and fractional derivatives to reformulate the MRGE as a time-dependent partial differential equation on a semi-infinite pseudo-space. They also propose a numerical algorithm based on polynomial expansions. This paper develops a numerical approach based on finite difference instead, by adopting techniques by [M. N. Koleva, Numerical solution of the heat equation in unbounded do- mains using quasi-uniform grids, in: International Conference on Large- Scale Scientific Computing, Springer, 2005, pp. 509–517] and [R. Fazio, A. Jannelli, Finite difference schemes on quasi-uniform grids for BVPs on infinite intervals, Journal of computational and Applied mathematics 269 (2014) 14–23] to cope with the issues of having an unbounded spatial domain. We compare convergence order and computational efficiency for particles of varying size and density of the polynomial expansion by Prasath et al., our finite difference schemes and a direct integrator for the MRGE based on multi-step methods proposed by [A. Daitche, Advection of inertial particles in the presence of the history force: Higher order numerical schemes, Journal of computational Physics 254 (2013) 93–106]. While all methods achieve their theoretical convergence order for neutrally buoyant particles with zero initial relative velocity, they suffer from various degrees of order reduction if the initial relative velocity is non-zero

关键词： Wakes

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Physical Properties of Varied Composition of Peanut Shell and Palm Oil Shell's Briquettes 10

Physical Properties of Varied Composition of Peanut Shell an...

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10th Asian Physics Symposium 2023, APS 2023

作者： Dalimunthe, Yusraida Khairani Widayani Aditya, Irfan Dwi Petroleum Engineering Faculty of Technology Earth and Energy Universitas Trisakti Jakarta11440 Indonesia Nuclear Physics and Biophysics Research Group Faculty of Mathematics and Natural Science Institut Teknologi Bandung Jalan Ganesha 10 Bandung40132 Indonesia Instrumentation and Computational Physics Research Group Faculty of Mathematics and Natural Science Institut Teknologi Bandung Jalan Ganesha 10 Bandung40132 Indonesia

This research aims to determine the physical properties of briquettes made from peanut shell (KKT) and palm oil shell (CKS) waste. The manufacturing process is carried out using a briquette press with a pressure of 70 N/m2, and each KKT and CKS is measured at 100 mesh. Two grams of starch adhesive and 15 ml of water are used in the process. This research method involves varying the quantities of KKT and CKS with the following ratios: S1(18:0), S2(16:2), S3(14:4), S4(12:6), S5(10:8), S6(8:10), S7(6:12), S8(4:14), S9(2:16), S10(0:18). The results of this research show that the lowest density of briquettes, 708.38 kg/m3, was produced by sample S6, while the highest density, 876.91 kg/m3, was produced by sample S3. The lowest elastic modulus of briquettes, 7 MPa, was recorded for sample S6, and the highest elastic modulus, 60 MPa, was observed for sample S10. Similarly, the lowest ultimate strength of briquettes, 1.35 MPa, was found in sample S6, while the highest ultimate strength, 6.03 MPa, was achieved in sample S10. © Published under licence by IOP Publishing Ltd.

关键词： Palm oil

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Modeling the ferroelectric phase transition in barium titanate with DFT accuracy and converged sampling

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Physical Review B 2024年第2期110卷 024101-024101页

作者： Lorenzo Gigli Alexander Goscinski Michele Ceriotti Gareth A. Tribello Laboratory of Computational Science and Modeling Institut des Matériaux Division of Chemistry and Chemical Engineering Centre for Quantum Materials and Technologies (CQMT) School of Mathematics and Physics

The accurate description of the structural and thermodynamic properties of ferroelectrics has been one of the most remarkable achievements of density functional theory (DFT). However, running large simulation cells with DFT is computationally demanding, while simulations of small cells are often plagued with nonphysical effects that are a consequence of the system's finite size. To avoid these finite-size effects one is thus often forced to use empirical models that describe the physics of the material in terms of effective interaction terms, that are fitted using the results from DFT. In this study we use a machine-learning (ML) potential trained on DFT, in combination with accelerated sampling techniques, to converge the thermodynamic properties of barium titanate (BTO) with first-principles accuracy and a full atomistic description. Our results indicate that the predicted Curie temperature depends strongly on the choice of DFT functional and system size, because of emergent long-range directional correlations in the local dipole fluctuations. Our findings demonstrate how the combination of ML models and traditional bottom-up modeling allow one to investigate emergent phenomena with the accuracy of first-principles calculations over the large size and time scales afforded by empirical models.

关键词： Ferroelectric phase transition Ferroelectricity Phase transitions Phase transitions by order Thermodynamics Ferroelectrics Functional materials Density functional theory Machine learning Materials modeling Molecular dynamics

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