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Leveraging ROTI map derived from Indonesian GNSS receiver network for advancing study of Equatorial Plasma Bubble in Southeast/East Asia

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Earth and Planetary physics 2025年第1期9卷 101-116页

作者： Prayitno Abadi Ihsan N.Muafiry Teguh N.Pratama Angga Y.Putra Suraina Gatot H.Pramono Sidik T.Wibowo Febrylian F.Chabibi Umar A.Ahmad Wildan P.Tresna Asnawi Research Center for Climate and Atmosphere Indonesian National Research and Innovation Agency(BRIN)BandungIndonesia School of Electrical Engineering Telkom UniversityBandungIndonesia Directorate of Laboratory Management Facilities and Science and Technology Park Indonesian National Research and Innovation Agency(BRIN)PontianakIndonesia Geophysics Laboratory Master Program in PhysicsUniversitas Gadjah Mada(UGM)YogyakartaIndonesia Research Center for Space Indonesian National Research and Innovation Agency(BRIN)BandungIndonesia Indonesian Geospatial Information Agency(BIG) JakartaIndonesia Research Center for Photonics Indonesian National Research and Innovation Agency(BRIN)Tangerang SelatanIndonesia Department of Earth and Planetary Sciences Hokkaido UniversitySapporoJapan

This paper highlights the crucial role of Indonesia’s GNSS receiver network in advancing Equatorial Plasma Bubble(EPB)studies in Southeast and East Asia,as ionospheric irregularities within EPB can disrupt GNSS signals and degrade positioning *** by the Indonesian Geospatial Information Agency(BIG),the Indonesia Continuously Operating Reference Station(Ina-CORS)network comprises over 300 GNSS receivers spanning equatorial to southern low-latitude ***-CORS is uniquely situated to monitor EPB generation,zonal drift,and dissipation across Southeast *** provide a practical tool for EPB research,by sharing two-dimensional rate of Total Electron Content(TEC)change index(ROTI)derived from this *** generate ROTI maps with a 10-minute resolution,and samples from May 2024 are publicly available for further scientific *** preliminary findings from the ROTI maps of Ina-CORS are ***,the Ina-CORS ROTI maps reveal that the irregularities within a broader EPB structure persist longer,increasing the potential for these irregularities to migrate farther ***,we demonstrate that combined ROTI maps from Ina-CORS and GNSS receivers in East Asia and Australia can be used to monitor the development of ionospheric irregularities in Southeast and East *** have demonstrated the combined ROTI maps to capture the development of ionospheric irregularities in the Southeast/East Asian sector during the G5 Geomagnetic Storm on May 11,*** observed simultaneous ionospheric irregularities in Japan and Australia,respectively propagating northwestward and southwestward,before midnight,whereas Southeast Asia’s equatorial and low-latitude regions exhibited irregularities *** sharing ROTI maps from Indonesia and integrating them with regional GNSS networks,researchers can conduct comprehensive EPB studies,enhancing the understanding of EPB behavior across Southeast and East Asia and contributing significantly to ionosphe

关键词： Equatorial Plasma Bubble(EPB) GNSS receivers’network Indonesia Continuously Operating Reference Station(Ina-CORS) ionospheric map Rate of TEC change index(ROTI)map

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Emergent Magnetic Phases and Piezomagnetic Effects in MnxNi1−xF2 Thin Film Alloys

arXiv

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arXiv 2023年

作者： Van Haren, Ryan Hald, Nessa Lederman, David Department of Physics University of California Santa Cruz Santa CruzCA95064 United States Materials Science and Engineering Program School for Engineering of Energy Matter and Transport Arizona State University TempeAZ85287 United States

The effect of random competing single-ion anisotropies in antiferromagnets was studied using epitaxial MnxNi1−xF2 antiferromagnetic thin film alloys grown via molecular beam epitaxy. The crystal structure of this material is tetragonal for all values of x, and the Mn sites have a magnetic easy axis single-ion anisotropy while the Ni sites have an easy plane anisotropy perpendicular to the Mn easy axis. Crystallographic and magnetization measurements demonstrated that the thin film alloys were homogeneously mixed and did not phase-separate into their constituent parts. Pure MnF2 thin films epitaxially grown on MgF2 exhibited compressive strain along all three crystallographic axes which resulted in piezomagnetic effects. The piezomagnetism disappeared if the film was grown on a (MnNi)F2 graded buffer layer. A mean-field theory fit to the transition temperature as a function of the Mn concentration x, which takes into account piezomagnetic effects, gave a magnetic exchange constant between Mn and Ni ions of JMnNi = 0.305±0.003 meV. Mean-field theory calculations also predicted the existence of an oblique antiferromagnetic phase in the MnxNi1−xF2 alloy which agreed with the experimental data. A magnetic phase diagram for MnxNi1−xF2 thin film alloys was constructed and showed evidence for the existence of two unique magnetic phases, in addition to the ordinary antiferromagnetic and paramagnetic phases: an oblique antiferromagnetic phase, and an emergent magnetic phase proposed to be either a magnetic glassy phase or a helical phase. The phase diagram is quantitatively different from that of FexNi1−xF2 because of the much larger single-ion anisotropy of Fe2+ compared to Mn2+ © 2023, CC BY.

关键词： Ions

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Development of a novel quality control indicator for coffee roasting based on the digitalization of smell by a portable electronic nose

Development of a novel quality control indicator for coffee ...

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International Joint Conference on Computer Science and Software engineering (JCSSE)

作者： Varanya Somaudon Pathapee Sakuldee Teerakiat Kerdcharoen Faculty of Science Materials Science and Engineering Program Mahidol University Bangkok Thailand School of Science Material Engineering Mae Fah Luang University Chiang rai Thailand Department of Physics Faculty of Science Mahidol University Bangkok Thailand

Northern Thailand is home to several Arabica coffee-growing regions, including Mae-kampong, Teentok, Mae-lord, and Monngo Valleys, whose coffees are featured throughout this study. These coffees have distinct aromas and flavors due to their varied cultivation locations, which are influenced by unique climatic conditions. The purpose of this paper is to comprehend the aroma of coffees brought from various locations and roasted under the same conditions. Our lab-made electronic nose (e-nose) was used to digitalize and analyze the smell of coffee. In order to monitor the coffee scent throughout roasting and assess how similar the aromas of coffee samples taken from various locations are to one another, principal component analysis and hierarchical cluster analysis were used. It was found that our e-nose system is an effective tool for determining the geo-location of the coffee origin as well as for quality control of coffee production.

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Nitridation Effects of a GaAs Epitaxial Layer on Extending of the Decay Time of Terahertz Electromagnetic Waves Emitted from Coherent Longitudinal Optical Phonons Observed with the Use of Terahertz Time-Domain Spectroscopy

Nitridation Effects of a GaAs Epitaxial Layer on Extending o...

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International Conference on Infrared and Millimeter Waves

作者： Hideo Takeuchi Kai Matsunaga Yusuke Sengi Jared Mitchell Rachel Goldman Department of Physics and Elecronics Osaka Metropolitan University (formerly Osaka City University) Osaka Japan Department of Applied Physics Osaka City University (Currently Osaka Metropolitan Univ.) Osaka Japan Applied Physics Program University of Michigan Ann Arbor Michigan U.S.A. Materials Science and Engineering University of Michigan Ann Arbor Michigan U.S.A.

ISBN: (数字)9798350370324

ISBN: (纸本)9798350370331

We observed that, in an undoped GaAs 1-x N x single epilayer, terahertz electromagnetic waves from coherent GaAs-like longitudinal optical (LO) phonons have a long decay time in comparison with terahertz waves from coherent LO phonons in a GaAs single crystal. We attributed the origin of the present phenomena to the fact photogenerated electron-LO-phonon scattering is suppressed owing to reduction of the ultrafast photocurrent acceleration that originates both from relatively large electron effective mass caused by the band anticrossing and from the alloying effect due to the nitridation.

关键词： Spectroscopy Stimulated emission Epitaxial layers Gallium arsenide Phonons Ultrafast optics Optical scattering Photoconductivity Time-domain analysis Electrons

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The third family quark mass hierarchy and FCNC in the universal seesaw model

arXiv

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arXiv 2024年

作者： Morozumi, Takuya Panuluh, Albertus Hariwangsa Physics Program Graduate School of Advanced Science and Engineering Hiroshima University Higashi-Hiroshima739-8526 Japan Core of Research for the Energetic Universe Hiroshima University Hiroshima Higashi-Hiroshima739-8526 Japan Department of Physics Education Sanata Dharma University Paingan Maguwohardjo Sleman Yogyakarta55282 Indonesia

We present the study of the quark sector of the universal seesaw model with SU(2)L × SU(2)R × U(1)Y′ gauge symmetry in the massless case of the two lightest quark families. This model aims to explain the mass hierarchy of the third family quark by introducing a vector-like quark (VLQ) partner for each quark. In this model, we introduce SU(2)L and SU(2)R Higgs doublets. We derive explicitly the Lagrangian for the quark sector, Higgs sector, and kinetic terms of the gauge fields, starting from the Lagrangian, which is invariant under SU(2)L × SU(2)R × U(1)Y′ gauge symmetry. At each stage of the symmetry breaking, we present the Lagrangian with the remaining gauge symmetry. Additionally, we investigate the flavor-changing neutral currents (FCNCs) of Higgs (h) and Z-boson in the interaction with the top, heavy top, bottom, and heavy bottom quarks. © 2024, CC BY.

关键词： Elementary particles

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Large magnetic anisotropy and magnetostriction in thin films of CoV2O4

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Physical Review Materials 2023年第1期7卷 014408-014408页

作者： Sangsoo Kim Christie J. Thompson Yan Xin Christianne Beekman National High Magnetic Field Laboratory Florida State University Tallahassee Florida 32310 USA Department of Physics Florida State University Tallahassee Florida 32306 USA Materials Science and Engineering Program Florida State University Tallahassee Florida 32310 USA

Spinel cobalt vanadate CoV2O4 has been grown on (001) SrTiO3 substrates. Using torque magnetometry experiments, we find that the previously observed temperature-induced anisotropy change, where the easy axis changes from the out-of-plane [001] direction to a biaxial anisotropy with planar <100> easy axes, occurs in a gradual second-order structural phase transition. This paper characterizes this transition and the magnetic anisotropies in the (001), (100), and (1¯10) rotation planes, and explores their field dependence up to 30 T. Below 80 K, hysteretic features appear around the hard axes, i.e., the out-of-plane direction in (1¯10) and (010) rotations and the planar <110> directions in (001) rotations. This is due to a Zeeman energy that originates from the lag of the magnetization with respect to the applied magnetic field as the sample is rotated. The appearance of the hysteresis, which persists up to very high fields, shows that the anisotropy at low temperature is rather strong. Additionally, field-dependent distortions to the symmetry of the torque response in increasing applied fields shows that magnetostriction plays a large role in determining the direction and magnitude of the anisotropy.

关键词： Magnetic anisotropy Magnetic phase transitions Structural properties

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Fabrication and Simulation of TE Modules for a Feasibility Study on Harvesting Solar Heat Energy from Roof Tiles

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Journal of Renewable Materials 2021年第10期9卷 1685-1697页

作者： Sakorn Inthachai Supasit Paengson Jindaporn Jamradloedluk Tosawat Seetawan Solar Energy and Energy Resources Research Unit Faculty of EngineeringMahasrakham UniversityKhamriang44150Thailand Program of Physics Faculty of Science and TechnologyThermoelectric Research LaboratoryCenter of Excellence on Alternative EnergyResearch and Development InstitutionSakon Nakhon Rajabhat UniversitySakon Nakhon47000Thailand

A novel roof tile thermoelectric generator(RT-TEG)was used to harvest electrical energy from a solar heat *** RT-TEG was fabricated and simulated by flat and curved thermoelectric modules consisting of p-n junctions of p-Sb_(2)Te_(3) and n-Bi_(2)Te_(3),with an Al_(2)O_(3) substrate at the top and bottom for heat absorption and heat *** RT-TEG was installed in a roof tile to act as a *** electrical voltage and power values of the curved thermoelectric modules were higher than those of the flat thermoelectric module by 0.44 V and 80 mW,at a temperature difference(ΔT)of 100 *** field tests,the RT-TEG produced a maximum electrical voltage of 33.70 mV and an electrical power of 46.24μW atΔT~7 K under a load resistance of 1Ωunder good sunshine at 13.00 *** energy conversion efficiency of RT-TEG was found to be 2.24×10^(−4).

关键词： Roof tiles micro-generator alternative energy thermoelectric module harvesting energy conversion energy

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Identification of subsurface soil layers in Sutami Dam area and its surroundings using magnetic methods 2

Identification of subsurface soil layers in Sutami Dam area ...

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2nd International Conference and Exhibition on Sciences and Technology, ICEST 2020

作者： Sutasoma, M. Susilo, A. Sunaryo, S. Suryo, E.A. Cahyo, R.H.D. Doctoral Program of Physics Faculty of Science Brawijaya University Jl. Veteran Jawa Timur Malang Indonesia Geophysics Engineering Faculty of Science Brawijaya University Jl. Veteran Jawa Timur Malang Indonesia Civil Engineering Faculty of Engineering Brawijaya University Jl. Veteran Jawa Timur Malang Indonesia Master Program of Physics Faculty of Science Brawijaya University Jl. Veteran Jawa Timur Malang Indonesia

The research was conducted to determine the subsurface layer type in the Sutami Dam area using magnetic methods. This study aims to determine the subsurface soil type in the area around the Sutami Dam. The instrument used in data collection was the Proton Precession Magnetometer (PPM) Scientrex Model G-8. The data collection area covers the Kromengan region (112.494oE;8.129oS) to the Sukorame area (112.358oE;-8.213oS). The area covers the Sutami Dam area. The research area is 15 km x 15 km or with an area of 225 KM with a space between points 300 m. From the data acquisition, it was found that the number of data collection points was 1372 points. The types of subsurface layers based on the 2,5 D Talwani modeling are soil, pumice, limestone, sandy tuff, sandstone, andesite, and lava. © 2021 Institute of physics Publishing. All rights reserved.

关键词： Lime

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Sodium niobate with high photocatalytic activity for the removal of organic dye and inactivation of Escherichia coli, Staphylococcus aureus, and Klebsiella pneumoniae bacteria: the effect of Zn doping on these properties

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Ceramics International 2025年

作者： Fernandes, Daiane Raubach, Cristiane Trassante, Carla Dias, Vagner Melo, Luize Silveira, Marcelle Carvalho, Ramon Moreira, Mario Jardim, Pedro Ferrer, Mateus Giongo, Janice Vaucher, Rodrigo Longo, Elson Cava, Sergio Post-Graduate Program in Materials Science and Engineering Federal University of Pelotas RS Pelotas96010-610 Brazil Post-Graduate Program in Microbiology and Parasitology Federal University of Pelotas RS Capão do Leão96160-000 Brazil Post-Graduate Program in Physics Federal University of Pelotas RS Capão do Leão96160-000 Brazil Functional Materials Development Center São Carlos Federal University SP São Carlos13565-905 Brazil

NaNbO3 doped with Zn (0.00, 0.02, and 0.05 mmol) was synthesized by the microwave-assisted hydrothermal method. Photocatalytic and antibacterial activities were investigated. X-ray diffraction revealed the coexistence of two orthorhombic symmetries (P21ma and Pbma), with doping promoting a progressive increase in the Pbma fraction. All samples exhibited a fiber-like shape (diameter of ∼200 nm), which remained unchanged with doping. The low Zn content (0.02 mmol) reduced the band gap energy from 3.08 to 2.95 eV. As a result, this sample exhibited superior photocatalytic activity, achieving 100 % RhB dye degradation within 45 min, under UV light. Scavenger tests revealed that hydroxyl radicals, holes, and superoxide radical anions were the main active species involved in the photocatalytic reaction. Additionally, the photocatalyst demonstrated excellent recyclability over three consecutive cycles. Pure NaNbO3 exhibited strong antibacterial activity, completely inhibiting the growth of S. aureus, E. coli, and K. pneumoniae at the tested concentrations. Although the Zn-doped sample also demonstrated antibacterial action, the response was concentration-dependent. This study is the first report on Zn doping in NaNbO3, as well as the first investigation of its antibacterial activity against K. pneumoniae and S. aureus. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Escherichia coli

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Hydraulic energy indices reveal spatial dependence in a subtropical soil under maize crop in Southern Brazil

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Pedosphere 2021年第5期31卷 771-782页

作者： Maria Eliza TUREK Robson Andre ARMINDO Ole WENDROTH Graduate Program of Environmental Engineering(PPGEA) Federal University of Paraná(UFPR)Curitiba 81531980(Brazil) Department of Physics(DFI) Federal University of Lavras(UFLA)Mailbox 3037Lavras 37200900(Brazil) Department of Plant&Soil Sciences University of Kentucky(UK)Lexington 40546-0091(USA)

Soil physical quality(SPQ)assessment is an important part in the evaluation of soil use,management,and *** can be assessed using several physical properties,hydraulic indices,and *** from tropical and temperate regions represent different physical behaviors,and the quantification of their physical properties is important to support soil evaluation and *** objective of this study was to evaluate the SPQ in a subtropical field under maize crop cultivation according to its physical properties,hydraulic indices,and functions in an attempt to infer the spatial variability and to determine the behavior of soil physical structure across a spatial *** used soil key physical variables,such as texture,bulk density,total porosity,saturated hydraulic conductivity,and organic carbon content,were measured in a regular grid with a soil sampling density of 30 points per hectare,covering an area of0.5 *** hydraulic conductivity varied strongly between subsamples and in the field,suggesting the heterogeneity of the soil structure regarding water *** physical variables were combined with other indicators,which were based on the soil water retention curve and the pore size distribution(PSD)*** analysis was performed to verify the relationship between the measured and calculated variables,and some strong linear correlations were revealed,such as between aeration energy index and microporosity(r=0.608)and water retention energy index with microporosity(r=0.532)and with bulk density(r=0.541).For most sampled locations,the shape and location parameters of PSD showed results outside of the optimum ranges,whereas the hydraulic energy indices and cumulative hydraulic energy functions presented values that were similar to those found for some tropical soils described in the *** spatial variability of these indices was described using semivariograms and kriged maps,indicating the variability of the SPQ i

关键词： geostatistics integral energy pore size distribution soil physical indicators soil physical quality soil water retention curve

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