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Information Technology International Seminar (ITIS)

作者： Adiyana Putri Endra Joelianto Faculty of Industrial technology Doctoral Program of Engineering Physics Institut Teknologi Bandung Bandung Indonesia Faculty of Industrial Technology Instrumentation and Control Research Group Institut Teknologi Bandung Bandung Indonesia

Traffic forecasting is essential for the intelligent transportation system and is applied to managing traffic networks. Recently, there has been a growing interest in incorporating spatial and temporal variables into the methodology of traffic forecasting. The primary emphasis of modern research lies in the complex architecture of graph neural networks. In contrast, preprocessing data for the input is also essential. Especially traffic data, such as traffic flows, have high nonlinearity and complex patterns. The traffic graph signal is attributes that are associated with the nodes. In this paper, the step of preprocessing data utilized graph signal processing (GSP) to filter noise from traffic signal data before the traffic flow data was applied for prediction tasks. The adjusted parameter for filtering noise was used. In this paper, the parameter was set from 0.1 to 10. The result shows that the increasing parameter filter of the graph data was smoothed filtered. Moreover, the smooth data is affected by the time horizons. For the increasing time horizon, we can use the large parameter and get the prediction error smaller than the shorter time horizon.

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Phase/Interfacial-Engineered Two-Dimensional-Layered WSe2 Films by a Plasma-Assisted Selenization Process: Modulation of Oxygen Vacancies in Resistive Random-Access Memory

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ACS Applied Materials and Interfaces 2023年第28期15卷 33858-33867页

作者： Chaudhary, Mayur Shih, Yu-Chuan Tang, Shin-Yi Yang, Tzu-Yi Kuo, Tzu-Wen Chung, Chia-Chen Shen, Ying-Chun Anbalagan, Aswin kumar Lee, Chih-Hao Hou, Tuo-Hung He, Jr-Hau Chueh, Yu-Lun Department of Materials Science and Engineering National Tsing Hua University Hsinchu30013 Taiwan International Intercollegiate Ph.D. Program National Tsing Hua University Hsinchu30013 Taiwan College of Semiconductor Research National Tsing Hua University Hsinchu30013 Taiwan Department of Physics National Sun Yat-Sen University Kaohsiung80424 Taiwan Department of Engineering and System Science National Tsing Hua University Hsinchu30013 Taiwan Department of Electronic Engineering National Yang Ming Chiao Tung University Hsinchu30013 Taiwan Department of Materials Science and Engineering City University of Hong Kong Hong Kong999077 Hong Kong Frontier Research Center on Fundamental and Applied Sciences of Matters National Tsing Hua University Hsinchu30013 Taiwan Semiconductor Research Center Hon Hai Research Institute Taipei11492 Taiwan

Here, we propose phase and interfacial engineering by inserting a functional WO3 layer and selenized it to achieve a 2D-layered WSe2/WO3 heterolayer structure by a plasma-assisted selenization process. The 2D-layered WSe2/WO3 heterolayer was coupled with an Al2O3 film as a resistive switching (RS) layer to form a hybrid structure, with which Pt and W films were used as the top and bottom electrodes, respectively. The device with good uniformity in SET/RESET voltage and high low-/high-resistance window can be obtained by controlling a conversion ratio from a WO3 film to a 2D-layered WSe2 thin film. The Pt/Al2O3/(2D-layered WSe2/WO3)/W structure shows remarkable improvement to the pristine Pt/Al2O3/W and Pt/Al2O3/2D-layered WO3/W in terms of low SET/RESET voltage variability (−20/20)%, multilevel characteristics (uniform LRS/HRS distribution), high on/off ratio (104-105), and retention (∼105 s). The thickness of the obtained WSe2 was tuned at different gas ratios to optimize different 2D-layered WSe2/WO3 (%) ratios, showing a distinctive trend of reduced and uniform SET/RESET voltage variability as 2D-layered WSe2/WO3 (%) changes from 90/10 (%) to 45/55 (%), respectively. The electrical measurements confirm the superior ability of the metallic 1T phase of the 2D-layered WSe2 over the semiconducting 2H phase. Through systemic studies of RS behaviors on the effect of 1T/2H phases and 2D-layered WSe2/WO3 ratios, the low-temperature plasma-assisted selenization offers compatibility with the temperature-limited 3D integration process and also provides much better thickness control over a large area. © 2023 American Chemical Society.

关键词： Aluminum oxide

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Visualizing Field-free Deterministic Magnetic Switching of all–van der Waals Spin-Orbit Torque System Using Spin Ensembles in Hexagonal Boron Nitride

arXiv

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arXiv 2025年

作者： Zhang, Xi Zhou, Jingcheng Hu, Chaowei Deng, Kuangyin Wang, Chuangtang Agarwal, Nishkarsh Jin, Hanshang Al-Matouq, Faris A. Xu, Stelo Trivedi, Roshan S. Li, Senlei Rathi, Sumedh Lu, Hanyi Jiang, Zhigang Taufour, Valentin Hovden, Robert Zhao, Liuyan Cheng, Ran Xu, Xiaodong Chu, Jiun-Haw Du, Chunhui Rita Wang, Hailong School of Physics Georgia Institute of Technology AtlantaGA30332 United States Department of Physics University of Washington SeattleWA98105 United States Department of Electrical and Computer Engineering University of California RiversideCA92521 United States Department of Physics University of Michigan Ann ArborMI48109 United States Department of Materials Science and Engineering University of Michigan Ann ArborMI48109 United States Department of Physics and Astronomy University of California DavisCA95616 United States Department of Physics University of California San Diego La Jolla CA92093 United States Applied Physics Program University of Michigan Ann ArborMI48109 United States Department of Physics and Astronomy University of California RiversideCA92521 United States Department of Materials Science and Engineering University of Washington SeattleWA98105 United States

Recently, optically active spin defects embedded in van der Waals (vdW) crystals have emerged as a transformative quantum sensing platform to explore cutting-edge materials science and quantum physics. Taking advantage of excellent solid-state integrability, this new class of spin defects can be arranged in controllable nanoscale proximity of target materials in vdW heterostructures, showing great promise for improving spatial resolution and field sensitivity of current sensing technologies. Building on this state-of-the-art measurement platform, here we report hexagonal boron nitride-based quantum imaging of field-free deterministic magnetic switching of room-temperature two-dimensional magnet Fe3GaTe2 in an all-vdW spin-orbit torque (SOT) system. By visualizing SOT-driven variations of nanoscale Fe3GaTe2 magnetic stray field profile under different conditions, we have revealed how the observed magnetic switching evolves from deterministic to indeterministic behavior due to the interplay between out-of-plane spins, in-plane spins and Joule heating. This understanding, which is otherwise difficult to access by conventional transport measurements, offers valuable insights on material design, testing, and evaluation of next-generation vdW spintronic devices. Copyright © 2025, The Authors. All rights reserved.

关键词： Van der Waals forces

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Preparation and properties of bimetallic Co/Cu ZIF-67 for electrochemical application 1

Preparation and properties of bimetallic Co/Cu ZIF-67 for el...

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1st Annual International Conference on Sensor Technology, INCOST 2023

作者： Wulandari, C. Gumilar, G. Nugraha Wasisto, H.S. Iqbal, M. Irzaman Nugroho, W.S. Rusydi, F. Doctoral Program of Engineering Physics Faculty of Industrial Technology Institut Teknologi Bandung Ganesha 10 Bandung40132 Indonesia Advanced Functional Materials Research Group Institut Teknologi Bandung Bandung40132 Indonesia PT Biostark Analitika Inovasi Bandung40375 Indonesia Bandung40135 Indonesia Research Center for Nanosciences and Nanotechnology Institut Teknologi Bandung Bandung40132 Indonesia PT Nanosense Instrument Indonesia Umbulharjo Yogyakarta55167 Indonesia Department of Physics Faculty of Mathematics and Natural Sciences IPB University Bogor16680 Indonesia Departement of Veterinary Public Health Faculty of Veterinary Medicine Universitas Gadjah Mada Yogyakarta55281 Indonesia Department of Physics Faculty of Science and Technology Universitas Airlangga Surabaya60115 Indonesia

Efforts to enhance the electrochemical properties of materials have become the focus of numerous studies because these properties are essential in various fields of application. Zeolitic imidazole framework-67 (ZIF-67) is a type of metal-organic framework (MOFs) expected to demonstrate excellent performance in electrochemical applications due to its numerous distinct properties. Consequently, various strategies and techniques have been developed to improve the electrochemical performance of ZIF-67. In this study, we employed bimetallic ZIF-67 constructed with cobalt (Co) and copper (Cu) metal ions within the imidazole frameworks. The use of bimetal is expected to increase conductivity and fine-tune the physicochemical properties of ZIF-67. Using coprecipitation methods, we synthesized both single-metal and bimetallic ZIF-67 and compared their characterizations. The addition of Cu metal ions does not alter the materials phase, ensuring compatibility with the single-metal ZIF-67 structure. However, the rhombic dodecahedron morphology of ZIF-67 shifts from a smooth to a concave and rough surface in Co/Cu ZIF-67. Furthermore, Co/Cu ZIF-67 exhibits higher peak current on their cyclic voltammetry (CV) curve by 46.15 μA. The results effectively illustrate the advantages of bimetal on ZIF-67 properties and performance. Finally, this study succesfully briefly demonstrate the potential development of Co/Cu-based ZIF-67 for various electrochemical applications. © Published under licence by IOP Publishing Ltd.

关键词： Metal ions

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Density Measurement of High-Tightness Woven Fabric using Variation of Field of View Stereo Photometry Method

Density Measurement of High-Tightness Woven Fabric using Var...

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International Conference on Instrumentation Control and Automation (ICA)

作者： Irwan Setiawan Endang Juliastuti Deddy Kurniadi Engineering Physics Doctoral Program Faculty of Industrial Technology Institut Teknologi Bandung Bandung Indonesia Instrumentation and Control Research Group Faculty of Industrial Technology Institut Teknologi Bandung Bandung Indonesia

High-tightness woven fabric (HTWF) density measurements have been developed using image analysis. In this study, the measurement of HTWF density is based on the three-dimensional surface structure of the fabric using the stereo photometry method. The woven fabric image was recorded with two fields of view (FOV). In each FOV, the image was recorded six times with different light directions. The unbiased stereo photometry algorithm was used to reconstruct the six images, resulting in a three-dimensional surface structure. The Hough transform detects and corrects the reconstructed image’s skew. The yarn position is obtained using the fabric surface structure profile. Finally, the weft and warp profile curves were smoothed using a locally weighted smoothing (LOESS) filter. The measurement error of woven fabric density at FOV 1 for twill weave patterns with errors in warp 2.88 to 5.83% and weft 1.69 to 4.93%, and satin weave patterns with errors in warp 1.15 to 2.93% and weft 0.96 to 3.22%. While the measurement error of woven fabric density at FOV 2 for twill weave patterns with errors in warp 0.25 to 1.31% and weft 0.28 to 1.82%, and satin weave patterns with errors in warp 0.04 to 1.01% and weft 0.04 to 0.82%.

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Structural properties of hyperuniform Voronoi networks

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Physical Review E 2025年第3期111卷 034123-034123页

作者： Eli Newby Wenlong Shi Yang Jiao Reka Albert Salvatore Torquato Department of Physics Pennsylvania State University University Park Pennsylvania 16802 USA Materials Science and Engineering Arizona State University Tempe Arizona 85287 USA Department of Physics Arizona State University Tempe Arizona 85287 USA Department of Chemistry Princeton University Princeton New Jersey 08544 USA Department of Physics Princeton University Princeton New Jersey 08544 USA Princeton Institute of Materials Princeton University Princeton New Jersey 08544 USA Program in Applied and Computational Mathematics Princeton University Princeton New Jersey 08544 USA

Disordered hyperuniform many-particle systems are recently discovered exotic states of matter, characterized by the complete suppression of normalized infinite-wavelength density fluctuations, as in perfect crystals, while lacking conventional long-range order, as in liquids and glasses. In this work, we begin a program to quantify the structural properties of nonhyperuniform and hyperuniform networks. In particular, large two-dimensional (2D) Voronoi networks (graphs) containing approximately 10,000 nodes are created from a variety of different point configurations, including the antihyperuniform hyperplane intersection process (HIP), nonhyperuniform Poisson process, nonhyperuniform random sequential addition (RSA) saturated packing, and both non-stealthy and stealthy hyperuniform point processes. We carry out an extensive study of the Voronoi-cell area distribution of each of the networks by determining multiple metrics that characterize the distribution, including their average areas and corresponding variances as well as higher-order cumulants (i.e., skewness γ1 and excess kurtosis γ2). We show that the HIP distribution is far from Gaussian, as evidenced by a high skewness (γ1=3.16) and large positive excess kurtosis (γ2=16.2). The Poisson (with γ1=1.07 and γ2=1.79) and non-stealthy hyperuniform (with γ1=0.257 and γ2=0.0217) distributions are Gaussian-like distributions, since they exhibit a small but positive skewness and excess kurtosis. The RSA (with γ1=0.450 and γ2=−0.0384) and the highest stealthy hyperuniform distributions (with γ1=0.0272 and γ2=−0.0626) are also non-Gaussian because of their low skewness and negative excess kurtosis, which is diametrically opposite of the non-Gaussian behavior of the HIP. The fact that the cell-area distributions of large, finite-sized RSA and stealthy hyperuniform networks (e.g., with N≈10,000 nodes) are narrower, have larger peaks, and smaller tails than a Gaussian distribution implies that in the thermodynamic limit th

关键词： Gaussian distribution

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Stress-tailoring magnetic anisotropy of V2O3/Ni bilayers

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Physical Review Materials 2022年第6期6卷 064408-064408页

作者： Christian T. Wolowiec Juan Gabriel Ramírez Min-Han Lee Nareg Ghazikhanian Nicolas M. Vargas Ali C. Basaran Pavel Salev Ivan K. Schuller Department of Physics University of California San Diego La Jolla California 92093 USA Department of Physics Universidad de los Andes Bogotá 111711 Colombia Materials Science and Engineering Program University of California San Diego La Jolla California 92093 USA

We report on a temperature-driven reversible change of the in-plane magnetic anisotropy of V2O3/Ni bilayers. This is caused by the rhombohedral to monoclinic structural phase transition of V2O3 at TC=160 K. The in-plane magnetic anisotropy is uniaxial above TC, but as the bilayer is cooled through the structural phase transition, a secondary magnetic easy axis emerges. Ferromagnetic resonance measurements show that this change in magnetic anisotropy is reversible with temperature. We identify two structural properties of the V2O3/Ni bilayers affecting the in-plane magnetic anisotropy: (1) a growth-induced uniaxial magnetic anisotropy associated with steplike terraces in the bilayer microstructure and (2) a low-temperature strain-induced biaxial anisotropy associated with the V2O3 structural phase transition. Magnetoresistance measurements corroborate the change in magnetic anisotropy across the structural transition and suggest that the negative magnetostriction of Ni leads to the emergence of a strain-induced easy axis. This shows that a temperature-dependent structural transition in V2O3 may be used to tune the magnetic anisotropy in an adjacent ferromagnetic thin film.

关键词： Anisotropic magnetoresistance Magnetic anisotropy Magnetization switching Magnetoresistance Magnetostriction Magnetotransport Microstructure Strain Structural phase transition Bilayer films Functional materials Magnetic systems Thin films Ferromagnetic resonance Microwave techniques Resistivity measurements X-ray diffraction

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Three-dimensional construction of hyperuniform, nonhyperuniform, and antihyperuniform disordered heterogeneous materials and their transport properties via spectral density functions

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Physical Review E 2025年第3期111卷 035310-035310页

作者： Wenlong Shi Yang Jiao Salvatore Torquato Materials Science and Engineering Arizona State University Tempe Arizona 85287 USA Department of Physics Arizona State University Tempe Arizona 85287 USA Department of Chemistry Princeton University Princeton New Jersey 08544 USA Department of Physics Princeton University Princeton New Jersey 08544 USA Princeton Institute of Materials Princeton University Princeton New Jersey 08544 USA Program in Applied and Computational Mathematics Princeton University Princeton New Jersey 08544 USA

Rigorous theories connecting physical properties of a heterogeneous material to its microstructure offer a promising avenue to guide the computational material design and optimization. The spectral density function χ̃V(k), which can be obtained experimentally from scattering data, enables accurate determination of various transport and wave propagation characteristics, including the time-dependent diffusion spreadability S(t) and effective dynamic dielectric constant εe for electromagnetic wave propagation. Moreover, χ̃V(k) determines rigorous upper bounds on the fluid permeability K. Given the importance of χ̃V(k), we present here an efficient Fourier-space based computational framework to construct three-dimensional (3D) statistically isotropic two-phase heterogeneous materials corresponding to targeted spectral density functions. In particular, we employ a variety of analytical functional forms for χ̃V(k) that satisfy all known necessary conditions to construct disordered stealthy hyperuniform, standard hyperuniform, nonhyperuniform, and antihyperuniform two-phase heterogeneous material systems at varying phase volume fractions. We show that by tuning the correlations in the system across length scales via the targeted functions, one can generate a rich spectrum of distinct structures within each of the above classes of materials. Importantly, we present the first realization of antihyperuniform two-phase heterogeneous materials in 3D, which are characterized by autocovariance function χV(r) with a power-law tail, resulting in microstructures that contain clusters of dramatically different sizes and morphologies. We also determine the diffusion spreadability S(t) and estimate the fluid permeability K associated with all of the constructed materials directly from the corresponding spectral densities. Although it is well established that the long-time asymptotic scaling behavior of S(t) only depends on the functional form of χ̃V(k), with the stealthy hyperuniform a

关键词： Spectral density

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Development of a Pixelated BaF2 Test Bed for Timing Applications

Development of a Pixelated BaF2 Test Bed for Timing Applicat...

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2022 IEEE Nuclear Science Symposium, Medical Imaging Conference, and Room Temperature Semiconductor Detector Conference, IEEE NSS MIC RTSD 2022

作者： Jordan, Tyler A. Andrews, Madison T. Johnson, Christopher R. McKigney, Edward A. Stange, Sy Vetter, Kai Los AlamosNM87545 United States Los AlamosNM87545 United States University of California Department of Nuclear Engineering BerkeleyCA94720 United States Lawrence Berkeley National Laboratory Applied Nuclear Physics Program BerkeleyCA94720 United States

ISBN: (纸本)9781665488723

Prototype pixelated BaF2 detectors for timing applications have been assembled using state-of-the-art commercial off-the-shelf components. 64 square rods of pure BaF2 (4.6 mm × 4.6 mm × 30 mm) are air-coupled in an 8 × 8 array to a Photonis XP85112 Planacon multianode microchannel plate photomultiplier tube;shortpass optical transmission interference filters may be inserted between the crystal array and photodetector to suppress the slow, self-trapped exciton luminescence. Three filter variants with different long wavelength cutoffs were tested experimentally, and the performance of each filter is assessed. The results of these and upcoming detector characterization exeriments will ascertain how well new technologies can leverage the unique timing properties of BaF2 in a practical system, and provide quantitative guidance for effective continued development. © 2022 IEEE.

关键词： barium fluoride (BaF2) multianode microchannel plate photomultiplier tube (MCP-PMT) optical transmission interference filter

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Evaluation of the Mechanisms Acting on the Atlantic Meridional Overturning Circulation in CESM2 for the 1pctCO_(2) Experiment

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Journal of Atmospheric Science Research 2024年第1期7卷 40-58页

作者： Lívia Sancho Elisa Passos Marcio Cataldi Luiz Paulo de Freitas Assad Luiz Landau Laboratory of Computational Methods in Engineering Civil Engineering ProgramAlberto Luiz Coimbra Institute for Graduate Studies and Research in EngineeringFederal University of Rio de JaneiroRio de Janeiro21941-617Brazil Civil Engineering Program Alberto Luiz Coimbra Institute for Graduate Studies and Engineering ResearchFederal University of Rio de JaneiroRio de Janeiro21941-617Brazil Physical Oceanography Laboratory Department of Physical OceanographyFaculty of OceanographyRio de Janeiro State UniversityRio de Janeiro20559-900Brazil Climate System Monitoring and Modeling Laboratory Water Resources and Environmental EngineeringFluminense Federal University24020-140Brazil Regional Atmospheric Modeling Group(MAR) Physics of the EarthDepartment of PhysicsRegional Campus of International Excellence(CEIR)“Campus Mare Nostrum”University of MurciaMurcia30100Spain Department of Meteorology Institute of GeosciencesFederal University of Rio de JaneiroRio de Janeiro21941-617Brazil

The Atlantic Meridional Overturning Circulation(AMOC)is a crucial component of the Earth’s climate system due to its fundamental role in heat distribution,carbon and oxygen transport,and the *** climate components,such as the atmosphere and sea ice,influence the *** the physical mechanisms of those interactions is paramount to increasing knowledge about AMOC’s *** this study,the authors used outputs from the Community Earth System Model version 2 and observational data to investigate changes in theAMOC and the associated physical *** DECK experiments were evaluated:piControl and 1pctCO_(2),with an annual increase of 1%of atmospheric CO_(2).The analysis revealed a significant decrease in the AMOC,associated with changes in mixed layer depth and buoyancy in high latitudes of the North Atlantic,resulting in the shutdown of deep convection and potentially affecting the formation of North Atlantic Deep Water and Antarctic Bottom Water.A vital aspect observed in this study is the association between increased runoff and reduced water evaporation,giving rise to a positive feedback ***,the rates of freshwater spreading have intensified during this period,which could lead to an accelerated disruption of the AMOC beyond the projections of existing models.

关键词： AMOC Meridional cell Climate change Deep circulation CESM2 results CMIP6

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