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17th Siam physics Congress: Carbon Neutrality, SPC 2022

作者： Khangrang, N. Kitisri, P. Saisut, J. Techakaew, K. Rimjaem, S. Plasma and Beam Physics Research Facility Department of Physics and Materials Science Faculty of Science Chiang Mai University Chiang Mai50200 Thailand Master Degree Program in Physics Chiang Mai University Chiang Mai50200 Thailand Thailand Center of Excellence in Physics Ministry of Higher Education Science Research and Innovation Bangkok10400 Thailand Ph.D. Degree Program in Physics Chiang Mai University Chiang Mai50200 Thailand

Development of an accelerator-based light source for generating coherent terahertz (THz) and mid-infrared (MIR) free-electron laser (FEL) is ongoing at the PBP-CMU Electron Linac Laboratory (PCELL). For producing high quality radiation, suitable electron beam property is necessary. In particle accelerator technology, transverse beam distribution and profile can be measured by using several techniques. The beam monitoring using view screen station is one of popular and effective methods. At PCELL, we use stations consisting of phosphor screen equipped with CCD camera to monitor, measure and record the beam image along the accelerator system and beamlines. The phosphor screen was chosen due to its high spatial resolution. The phosphor film is uniformly coated on a thin aluminium plate. Its green emission when electrons hitting the screen is matched well with the respond of the CCD camera. The screen can be moved in and out from the vacuum chamber using the air pressurized linear actuator. This paper presents about design, construction and tests of the screen stations at PCELL. The resolution of measurements for beam transverse profile and emittance is also be discussed. © Published under licence by IOP Publishing Ltd.

关键词： CCD cameras

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Compressive strength, water absorption and pulse velocity tests of calcined clay- limestone cement mortars

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Materials Today: Proceedings 2022年 65卷 2394-2398页

作者： Parsompech, Natthaphat Rianyoi, Rattiyakorn Chaipanich, Arnon Department of Physics and Materials Science Faculty of Science Chiang Mai University Chiang Mai 50200 Thailand Master's Degree Program in Faculty of Science Chiang Mai University Chiang Mai 50200 Thailand

The cement industry consumes a lot of energy and releases CO2 to the environment causing air pollution. The replacement of Portland cement is one way to reduce CO2. This research investigated the replacement of Portland cement (PC) by calcined clay (CC) and Limestone (LS). It was found that compressive strength reduced when using LS as PC replacement. On the other hand, using CC content from 10% to 30 wt% can improve the compressive strength in limestone mixes and reduce water absorption and void content. The mortar content of 30 wt% calcined clay gave the highest compressive strength, the lowest water absorption and void content. The pulse velocity test results were found to have a trend similar to that of the compressive strength results which showed a direct relationship between pulse velocity and compressive strength. © 2022 Elsevier Ltd. All rights reserved.

关键词： Compressive strength

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Design, construction, and measurement of electromagnetic steering magnet for 25-MeV electron accelerator system 17

Design, construction, and measurement of electromagnetic ste...

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17th Siam physics Congress: Carbon Neutrality, SPC 2022

作者： Kitisri, P. Khangrang, N. Kitisri, T. Rimjaem, S. Plasma and Beam Physics Research Facility Department of Physics and Materials Science Faculty of Science Chiang Mai University Chiang Mai50200 Thailand Master Degree Program in Physics Chiang Mai University Chiang Mai50200 Thailand Thailand Center of Excellence in Physics Ministry of Higher Education Science Research and Innovation Bangkok10400 Thailand

Mid-infrared and terahertz free-electron laser (MIR/THz FEL) facility is under the construction at the PBP-CMU Electron Linac Laboratory (PCELL) in Chiang Mai University. For producing MIR-FEL, electron beams with an energy of 25 MeV accelerated by a radio-frequency linear accelerator (RF linac) are required. Transporting the 25-MeV electron beam from the linac to the MIR-FEL station requires small dipole magnets for steering the electron beams along the beamline. This work focuses on the design, construction, and measurement of an electromagnetic steering magnet for controlling the electron beam trajectory. A computer software, CST Studio Suite 2022 is used for the 3D magnetic field simulation of the magnet. The physical length of the magnet and the diameter of copper coil are decided based on the simulation and calculation results. After the construction, a hall probe with a measuring system controlled by a computer program is used to measure the magnetic field for comparison with the simulation results. From simulated and calculated results, the steering magnet with a length of 40 mm and the coil with a diameter of 1.06 mm was chosen. At an applied current of 1.8 A, this steering magnet can bend the 25-MeV electron beam with a bending angle of 13.7 mrad. The measured magnetic field is consistent with the simulated results. The advantage of this steering magnet is that it can be assembled on a square frame for steering the beam in both horizontal and vertical direction. It can also be used for the THz-FEL beamline, which requires the electron beam with an energy of 10-16 MeV. © Published under licence by IOP Publishing Ltd.

关键词： Electron beams

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A computational study of the gas-phase interstellar formose-like reactions 17

A computational study of the gas-phase interstellar formose-...

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17th Siam physics Congress: Carbon Neutrality, SPC 2022

作者： Wongkummoon, P. Keyen, U. Nimmanpipug, P. Rimjaem, S. Suwannajak, C. Plasma and Beam Physics Research Facility Department of Physics and Materials Science Faculty of Science Chiang Mai University Chiang Mai50200 Thailand Master Degree Program in Physics Chiang Mai University Chiang Mai50200 Thailand Chiang Mai Chiang Mai50180 Thailand Department of Chemistry Faculty of Science Chiang Mai University Chiang Mai50200 Thailand

Understanding the extraterrestrial origin of ribose, as one of the sub-units of ribonucleic acid (RNA), is crucial to anticipating the formation of the building blocks of life under interstellar medium (ISM) conditions. Under ordinary atmospheric conditions, the formation of sugar is suggested to occur through the formose reaction, where formaldehyde is solely used as the precursor in each of the iterative steps of the formation process. On the other hand, sugar synthesis under ISM conditions has evidently been shown to be significantly different from the terrestrial formose reactions due to the extremely low density of molecules and the very low temperature. In this study, we theoretically investigate the formose-like reactions for ribose formation catalyzed by a single proton through the mean of computer simulation based on first-principles density functional theory (DFT). The ribose formation reactions are modelled in the absence of solvation effects at absolute zero temperature to mimic the extremely low pressure and temperature found in ISM. We observe that the presence of a proton gives rise to a more thermodynamically stable complex of the two reactive carbonyl compounds by bridging their oxygen atoms as required for the iterative formose reaction to proceed. In order to form a new carbon-carbon bond through an iterative process, only the region where the additional formaldehyde attaches to the existed protonated carbonyl compound is of great importance. The energy barriers for all the iterative steps during the ribose formation are similar, i.e., ∼67 kcal mol-1. Our findings show that a single proton can act as an efficient catalyst for the gas-phase ribose formation reactions in the absence of solvent effects. The results also suggest that ribose formation can preferentially occur via the formose pathway in the presence of protons, which are abundantly presented in ISM. © Published under licence by IOP Publishing Ltd.

关键词： Formaldehyde

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IoT-based Wireless Sensor Networks for Monitoring Drinking Water Treatment Plants

IoT-based Wireless Sensor Networks for Monitoring Drinking W...

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International Workshop on Secure Internet of Things (SIoT)

作者： Luiz Octávio Martini Lima Lucas Carvalho Goncalves Gustavo Campos Menezes Lucas Silva de Oliveira Gleb Wataghin Institute of Physics UNICAMP Campinas SP Brazil Master Degree Program in Automation and Systems CEFET-MG Leopoldina MG Brazil Department of Electronics and Computing CEFET-MG Contagem MG Brazil Department of Mechatronics Engineering CEFET-MG Divinópolis MG Brazil

ISBN: (数字)9798331507466

ISBN: (纸本)9798331507473

The increasing need for efficient monitoring of parameters in challenging industrial environments, such as basic sanitation, has led to the search for integrated and user-friendly solutions that can address specific challenges of this setting. This project aims to develop a solution to meet monitoring requirements in water treatment plants. The proposed solution involves the development of both hardware and software for collecting data from the water treatment process using sensors and transmitting this information to a server structure, database, and communication interface with the cloud-based user. The effectiveness of the proposed device is being evaluated in six water treatment units located in the states of Alagoas, Mato Grosso, Paraná, Rio de Janeiro, and São Paulo. Preliminary results indicate that the proposed solution is capable of monitoring the variables involved in the water flocculation stage and generating a comprehensive set of information about the process over time.

关键词： Cloud computing Chemical sensors Wireless sensor networks User interfaces Hardware Software Sensors Social Internet of Things Servers Monitoring

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Randomized Spline Trees for Functional Data Classification: Theory and Application to Environmental Time Series

arXiv

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arXiv 2024年

作者： Riccio, Donato Maturo, Fabrizio Romano, Elvira Machine Learning Engineer and Student in the Data Science Master’s Degree Program The University of Campania Luigi Vanvitelli Caserta Italy Department of Economics Statistics and Business Faculty of Technological and Innovation Sciences Universitas Mercatorum Rome Italy Department of Mathematics and Physics University of Campania Luigi Vanvitelli Caserta Italy

Functional data analysis (FDA) and ensemble learning can be powerful tools for analyzing complex environmental time series. Recent literature has highlighted the key role of diversity in enhancing accuracy and reducing variance in ensemble *** paper introduces Randomized Spline Trees (RST), a novel algorithm that bridges these two approaches by incorporating randomized functional representations into the Random Forest framework. RST generates diverse functional representations of input data using randomized B-spline parameters, creating an ensemble of decision trees trained on these varied representations. We provide a theoretical analysis of how this functional diversity contributes to reducing generalization error and present empirical evaluations on six environmental time series classification tasks from the UCR Time Series Archive. Results show that RST variants outperform standard Random Forests and Gradient Boosting on most datasets, improving classification accuracy by up to 14%. The success of RST demonstrates the potential of adaptive functional representations in capturing complex temporal patterns in environmental data. This work contributes to the growing field of machine learning techniques focused on functional data and opens new avenues for research in environmental time series *** Codes 62M10, 68T05, 65D07, 68T10 © 2024, CC BY.

关键词： Spatio-temporal data

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Synthesis of Na(Fe1-xAlx)PO4 cathode materials for sodium battery

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Materials Today: Proceedings 2022年 65卷 2284-2289页

作者： Kaewluang, Napatsorn Pengpat, Kamonpan Tunkasiri, Tawee Intatha, Uraiwan Eitssayeam, Sukum Master's Degree Program in Materials Science Faculty of Science Chiang Mai University Chiang Mai 50200 Thailand Graduate School Chiang Mai University Chiang Mai Thailand Department of Physics and Materials Science Chiang Mai University Chiang Mai 50200 Thailand Center of Innovative Materials for Sustainability School of Science Mae Fah Luang University Chiang Rai 57100 Thailand Materials Science Research Center Faculty of Science Graduate School Chiang Mai University Thailand

The battery is one of the most important energy sources. The most popular types of battery for energy storage are lithium batteries. However, due to its high energy storage value and long service life, there are also disadvantages to the environment. Because lithium batteries are still toxic, making the disposal or recycling of lithium batteries difficult. This has led to the development of sodium-ion batteries (SIBs) in high-efficiency electrochemical energy storage devices and rechargeable electric vehicles to replace lithium batteries with limited lithium content. In comparison, sodium batteries use elemental sodium that is readily available, abundant, and has low production costs. For battery applications, Na+ sodium ion provides an efficient moving charge carrier, stable structure, and can make phosphate electrodes with a stable open structure. Furthermore, it gives a voltage value of 3.4 V. Therefore, a synthetic method study in this study. Na(Fe1-xAlx)PO4 through a solid-state process and calcination at 650, 675, 700, 725, and 750 °C to provide the substance with the desired phase. The samples were analyzed through the phase formation analysis process using X-ray diffraction (XRD), differential thermal analysis (DTA), and morphology characterized by scanning electron microscopy (SEM). This experiment and study guide the future development of sodium acid ion batteries. © 2022

关键词： Iron compounds

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Preparation of LFP-based cathode materials for lithium-ion battery applications

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Materials Today: Proceedings 2022年 65卷 2347-2350页

作者： Suttison, Suchanat Pengpat, Kamonpan Intatha, Uraiwan Fan, Jinchen Zhang, Wei Eitssayeam, Sukum Master's Degree Program in Materials Science Faculty of Science Chiang Mai University Chiang Mai 50200 Thailand Graduate School Chiang Mai University Chiang Mai Thailand Department of Physics and Materials Science Faculty of Science Chiang Mai University Thailand Center of Innovative Materials for Sustainability School of Science Mae Fah Luang University Chiang Rai 57100 Thailand School of Materials and Chemistry University of Shanghai for Science and Technology Shanghai 200093 China Department of Engineering Mechanics Dalian University of Technology Dalian 116024 China

Lithium-ion batteries (LIB) have developed into the mainstream power source of energy storage devices due to their advantages: high power density, high power, long service life, and less pollution. This materials development for LFP batteries was considered successful in synthesizing powder. Here we show that three synthesis conditions were performed. LFP doped NiO, NMC, and (NH4)2HPO4 were synthesized by the nitrogen gas flow method. LFP-doped NiO was burned at 600 °C and 700 °C for five h. NMC doped with LFP burned at 550 °C for five h, and NMC-doped LFP and (NH4)2HPO4 were burned at 550 °C and 600 °C for five h. The structure and morphology of the material were examined by X-ray diffraction (XRD) and scanning electron microscopy (SEM). © 2022

关键词： Lithium-ion batteries

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Synthesis of SrAl2O4: Dy3+ and Eu2+ as the Photoluminescence and Long-Lasting Properties

SSRN

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SSRN 2024年

作者： Naowasate, Satethabood Kaewluang, Napatsorn Kietisirirojana, Napassorn Pengpat, Kamonpan Intatha, Uraiwan Eitssayeam, Sukum Master’s Degree Program in Materials Science Faculty of Science Chiang Mai University Chiang Mai50200 Thailand Doctoral Degree Program in Materials Science Faculty of Science Chiang Mai University Chiang Mai50200 Thailand Graduate School Chiang Mai University Chiang Mai Thailand Department of Physics and Materials Science Chiang Mai University Chiang Mai50200 Thailand Center of Innovative Materials for Sustainability School of Science Mae Fah Luang University Chiang Rai57100 Thailand Materials Science Research Center Faculty of Science Graduate School Chiang Mai University Thailand

This study presents the synthesis and characterization of SrAl2O4 phosphors doped with Dy3+ and Eu2+ ions. The phosphors were prepared via the solid-state reaction method and their crystal structure was analyzed using X-ray diffraction (XRD). The surface morphology and microstructure were examined using scanning electron microscopy (SEM), while the luminescent properties were evaluated through photoluminescence (PL) emission spectra. The synthesized phosphors exhibited a uniform and compact morphology, with well-defined particles and high purity. Under UV excitation, the phosphors displayed intense emission peaks in the blue-green region of the spectrum. The emitted color could be tuned by adjusting the Eu2+:Dy3+ ratio, offering flexibility for specific application requirements. Additionally, the phosphors demonstrated excellent long-lasting luminescence properties, with sustained emission visible even after several minutes of UV excitation. These findings highlight the potential of SrAl2O4: Dy3+ and Eu2+ phosphors for various applications, particularly those requiring persistent emission in low-light conditions. The results contribute to the understanding of the synthesis, characterization, and potential applications of these phosphors, opening avenues for further research in the field. © 2024, The Authors. All rights reserved.

关键词： Strontium compounds

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Effect of reducing calcination processing on structural and electrochemical properties of LiNi 0.5 Mn 0.3 Co 0.2 O 2 cathode materials for lithium battery

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Materials Today: Proceedings 2021年 47卷 3600-3603页

作者： Jaruwan Kanthachan Orawan Khamman Uraiwan Intatha Sukum Eitssayeam Master’s Degree Program in Materials Science Faculty of Science Chiang Mai University Chiang Mai 50200 Thailand Graduate School Chiang Mai University Chiang Mai Thailand Department of Physics and Materials Science Faculty of Science Chiang Mai University Chiang Mai 50200 Thailand Center of Innovative Materials for Sustainability School of Science Mae Fah Luang University Chiang Rai 57100 Thailand

Lithium-ion batteries (LIBs) are capable of meeting the challenges associated with next-generation energy storage devices. Use of NMC has grown at 400,000 tons per year in 2025. Because of its performance surpassing that of other cathode materials. Thus, in this work, the synthesis of lithium nickel manganese cobalt oxide (LiNi 0.5 Mn 0.3 Co 0.2 O 2 ; NMC) was doped carbon in the calcination process was investigated. Excellent intercalation of lithium ions transfer between cathode and anode was noted. Differential Thermal Analysis (DTA) results showed that NMC crystalized at 550 °C. Changes were confirmed by using both X-ray diffract meter (XRD) and Scanning Electron Microscope (SEM). The study of the possibility of NMC cathode materials in which the enhancement of electrochemical performance was investigated by charge–discharge capacity in 0.1C-rate were carried out to reveal carbon's effect pristine NMC.

关键词： Lithium-ion batteries Lithium nickel manganese cobalt oxide Energy storage Reducing process calcination Add carbon Areal capacity

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