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Field-tunable Weyl points and large anomalous Hall effect in the degenerate magnetic semiconductor EuMg2Bi2

Physical Review B 2023年第12期107卷 L121112-L121112页

作者： M. Kondo M. Ochi R. Kurihara A. Miyake Y. Yamasaki M. Tokunaga H. Nakao K. Kuroki T. Kida M. Hagiwara H. Murakawa N. Hanasaki H. Sakai Department of Physics Osaka University Toyonaka Osaka 560-0043 Japan Forefront Research Center Osaka University Toyonaka Osaka 560-0043 Japan The Institute for Solid State Physics The University of Tokyo Kashiwa Chiba 277-8581 Japan Department of Physics Faculty of Science and Technology Tokyo University of Science Noda Chiba 278-8510 Japan Research and Services Division of Materials Data and Integrated System (MaDIS) National Institute for Materials Science(NIMS) Tsukuba Ibaraki 305-0047 Japan Center for Emergent Matter Science (CEMS) RIKEN Wako Saitama 351-0198 Japan Photon Factory Institute of Materials Structure Science KEK Tsukuba Ibaraki 305-0801 Japan Center for Advanced High Magnetic Field Science (AHMF) Graduate School of Science Osaka University Toyonaka Osaka 560-0043 Japan Spintronics Research Network Division Institute for Open and Transdisciplinary Reserch Initiatives Osaka University Suita Osaka 565-0871 Japan

Magnets, with topologically nontrivial Dirac/Weyl points, have recently attracted significant attention owing to their unconventional physical properties, such as a large anomalous Hall effect. However, they typically have a high carrier density and a complicated band structure near the Fermi energy. In this Letter, we report a degenerate magnetic semiconductor EuMg2Bi2, which exhibits a single valley at the Γ point, where field-tunable Weyl points form via a magnetic exchange interaction with the local Eu spins. By the high-field measurements on high-quality single crystals, we observed quantum oscillations in the resistivity, elastic constant, and surface impedance, which enabled us to determine the position of the Fermi energy EF. In combination with a first-principles calculation, we revealed that the Weyl points are located in the vicinity of EF when the Eu spins are fully polarized, leading to a peak of energy-dependent anomalous Hall conductivity due to the Berry curvature. Accordingly, in the forced ferromagnetic phase, we observed a large anomalous Hall effect (Hall angle ΘAH∼0.07) qualitatively consistent with the calculation, which demonstrates a marked impact of the Weyl points in the simple band structure.

关键词： Anomalous Hall effect Electrical conductivity Fermi surface First-principles calculations Hall effect Magnetic interactions Magnetic order Magnetoresistance Magnetotransport Shubnikov-de Haas effect Spin-orbit coupling Topological Hall effect Topological materials Transport phenomena de Haas-van Alphen effect

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Enhanced Aerosol Source Identification by Utilizing High Molecular Weight Signals in Aerosol Mass Spectra

ACS ES&T Air

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ACS ES&T Air 2024年第6期1卷 502-510页

作者： Yanjun Zhang Liine Heikkinen Mikko Äijälä Otso Peräkylä Frans Graeffe Valter Mickwitz Jian Zhao Kaspar Daellenbach Donna Sueper Douglas Worsnop Matthieu Riva Mikael Ehn Institute for Atmospheric and Earth System Research/Physics Faculty of Science University of Helsinki Helsinki 00014 Finland Univ. Lyon Université Claude Bernard Lyon 1 CNRS IRCELYON Villeurbanne 69626 France Department of Environmental Science (ACES) & Bolin Centre for Climate Research Stockholm University Stockholm SE-106 91 Sweden LUT School of Energy Systems Lappeenranta Lahti University of Technology (LUT) Lahti FI-15210 Finland Laboratory of Atmospheric Chemistry Paul Scherrer Institute (PSI) Villigen-PSI 5232 Switzerland Aerodyne Research Inc. Billerica Massachusetts 01821 United States

The aerosol mass spectrometer (AMS) has significantly expanded our understanding of aerosol chemical composition over the past few decades. However, most studies have made limited use of the high molecular weight (HMW) signals in the mass spectra due to their low intensities and multiple overlapping peaks. Using long time-of-flight (LTOF) AMS measurements at a boreal forest site in Finland, we utilize the high resolution of the LTOF and the newly developed binPMF approach to explore the potential of the HMW range to improve source identification. During our measurements, inorganics (primarily sulfate) contributed ∼30% and oxygenated organic aerosol (OOA) contributed ∼60% to aerosol mass. The remaining ∼10% were attributed to specific organic aerosol types: hydrocarbon-like OA (HOA) ∼3%, biomass burning OA (BBOA) ∼0.06%, and a pollution plume from the Kola Peninsula ∼5%. None of these factors were separated using traditional unit-mass resolution PMF (m/z12–150 Th). The small BBOA factor was only extracted using binPMF on the 100–225 amum/zrange, and using this BBOA temporal profile, we could constrain the BBOA factor for the lower masses, revealing a prominent signal atm/z60 (a tracer for levoglucosan). We encourage AMS users to experiment with the presented approach with their own datasets.

关键词： Aerosols Anions Ions Mathematical methods Redox reactions

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Numerical simulation of drifted marine debris in suo-nada caused by the north kyushu heavy rainfall on july 2012 30

Numerical simulation of drifted marine debris in suo-nada ca...

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30th International Ocean and Polar Engineering Conference, ISOPE 2020

作者： Triwahyuni, Andhita Asai, Koji Hendrawan, I Gede Shirozu, Hajime System Design and Environmental Engineering Yamaguchi University Japan Division of Civil and Environmental Engineering Graduate School of Science and Technology for Innovation Yamaguchi University Japan Marine Fisheries Faculty Udayana University Bali Indonesia

ISBN: (纸本)9781880653845

The numerical simulations using Finite Volume Coastal Ocean Model (FVCOM) forced by the eight tidal component (S2, M2, N2, K2, K1, P1, O1, Q1), river discharge, and wind speed was conducted to clarify the conditions that caused marine debris to reach the Ube Port from the river mouth of Yamakuni River on July 2012. Marine debris was modeled to be particles whose behaviors observed by Lagrangian method with an improvement that include a wind component directly driving the debris. It was found that wind plays the most important role at drifting the particles across Suo-Nada. © 2020 by the International Society of Offshore and Polar Engineers (ISOPE).

关键词： Rivers

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The Phenology and Water Level Time-Series Mangrove Index for Improved Mangrove Monitoring

SSRN

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SSRN 2024年

作者： Sun, Weiwei Huang, Ke Yang, Gang Fu, Bolin Chen, Chao Meng, Xiangchao Feng, Tian Ge, Yong Department of Geography and Spatial Information Techniques Ningbo University Ningbo315211 China Zhejiang Collaborative Innovation Center Ningbo Universities Collaborative Innovation Center for Land and Marine Spatial Utilization and Governance Research Ningbo315211 China Faculty of Electrical Engineering and Computer Science Ningbo University Ningbo315211 China State Key Laboratory of Resources and Environmental Information System Institute of Geographic Sciences & Natural Resources Research Chinese Academy of Sciences Beijing100101 China College of Geomatics and Geoinformation Guilin University of Technology Guilin541006 China School of Geography Science and Geomatics Engineering Suzhou University of Science and Technology Suzhou215009 China

Mangroves are declining and degrading under the influence of human activities and natural factors, making their accurate mapping and dynamic monitoring essential. However, most of the existing mangrove indices based on the spectral characteristics of multispectral images have some limitations in recognition accuracy and universality. Therefore, this study aimed to develop a robust and efficient Phenology and Water level Time-series Mangrove Index (PWTMI) for mangrove monitoring. PWTMI is constructed by combining spectral and temporal characteristics from dense time-series multispectral data, wherein phenology and water level time-series characteristics are extracted from NDVI and MNDWI time series. The results show that PWTMI outperforms existing multispectral-based mangrove indices and has an accuracy similar to a hyperspectral-based mangrove index, with overall accuracy ranging from 91.49% to 98.83% and F1 score ranging from 0.91 to 0.98 in four typical areas in China, indicating great potential for long time-series and large-scale mangrove monitoring. © 2024, The Authors. All rights reserved.

关键词： Water levels

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Annual nationwide environmental impact assessment of Japanese municipalities within the framework of endpoint-type lcia method "lime2

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Journal of environmental Engineering (Japan) 2019年第764期84卷 955-965页

作者： Yamasaki, Junya Ikaga, Toshiharu Itsubo, Norihiro Graduate School of Science and Technology Keio.Univ Japan Dept. of System Design Engineering Faculty of Science and Technology Keio Univ Japan Faculty of Environmental Studies Dept of Environmental Management Tokyo City Univ Japan

This study attempted to comprehensively measure annual environ mental loads emitted in Japanese administrative divisions (municipalities) in the year 2015 using the LCIA method IJME2. Using statistical information that was reliable, verifiable, and comparable, the environmental damage amount for the whole of Japan was calculated to be 8.53 trillion yen. The top three amounts for each impact category were "Global warming". "Land use", and "Waste (domestic)". The damage amounts per capita were placed on a map of Japan to visualize tendencies related to population distribution and industrial activity. © 2019 Architectural Institute of Japan. All rights reserved.

关键词： Global warming

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Zno Intercalated into Graphene Oxide Based 2-D Binary Composite for Improved Thermal Properties Using as a Potential Nanofluid

SSRN

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SSRN 2023年

作者： Ahmed, Waqar Zhan, Yiqiang Zhang, Hongtao Zhou, Xueling Mehmood, Shahid Mudasar, Farhan Kazi, S.N. Greater Bay Area Institute of Precision Medicine Guangzhou511462 China Centre of Micro-Nano System School of Information Science and Technology Fudan University Shanghai200433 China Thammasat University Pathum Thani 12121 Thailand Department of Physical and Environmental Sciences University of Toronto Canada Faculty of Engineering Department of Mechanical Engineering University of Malaya Malaysia

The advanced hummer method and sonochemical techniques were used to synthesize ZnO, GO, and ZnO@GO composites. Further 2-step preparation methods were used to prepare ZnO@GO/DW based well stable nanofluids at changing 0.1, 0.075, 0.05, and 0.025 wt.% concentrations. All the materials were confirmed by different characterizations like XRD, RAMAN, FESEM, EDX, and UV-Vis analysis. At 0.1 wt.% all the nanofluids showed a higher thermal conductivity, viscosity, and density which is 0.821 W/m.K, 2.85 kg.m-1s-1, and 1.0018 g/cm3. All the wt.% were tested for stability analysis using the sedimentation photograph method and found remarkable stability up to 5 weeks after the day of preparation without using any surfactant. Similarly, all the nanofluids were tested for hydrodynamic characteristics like friction coefficient (ff), pressure drop(ΔP), and pumping power(PP) where a notable value of friction was 0.057, a 12000 *** pressure drop and 1.45MPa pumping power were achieved at 0.1 wt.% against the higher value of Reynold numbers (5849 to 24544). Finally, the greater development in average heat transfer/Nusselt numbers was achieved which is 3010/70 W/m2.K, 2490/42 W/m2.K, 2133/32 W/m2.K 2000/29 W/m2.K and 1000/W/m2.K for all wt.% and base fluid (DW) at a higher rate of Reynolds. © 2023, The Authors. All rights reserved.

关键词： Zinc oxide

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Lung deposited surface area of atmospheric aerosol particles at three observatories in Japan

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Atmospheric Environment 2021年 262卷 118597-118597页

作者： Kurihara, Kazuki Iwata, Ayumi Kiriya, Miho Yoshino, Ayako Takami, Akinori Matsuki, Atsushi Nishita-Hara, Chiharu Hara, Keiichiro Hayashi, Masahiko Kaneyasu, Naoki Seto, Takafumi Fujitani, Yuji Funato, Koji Inoue, Kozo Okuda, Tomoaki Faculty of Science and Technology Keio University Yokohama Japan Center for Regional Environmental Research National Institute for Environmental Studies Tsukuba Japan Institute of Nature and Environmental Technology Kanazawa University Kanazawa Japan Fukuoka Institute for Atmospheric Environment and Health Fukuoka University Fukuoka Japan Department of Earth System Science Faculty of Science Fukuoka University Fukuoka Japan National Institute of Advanced Industrial Science and Technology Tsukuba Japan Graduate School of Natural Science and Technology Kanazawa University Kanazawa Japan Center for Health and Environmental Risk Research National Institute for Environmental Studies Tsukuba Japan Tokyo Dylec Corporation Shinjuku Japan

The lung deposited surface area (LDSA) measured by diffusion charging (DC) method has been recently receiving increased attention as it is believed to accurately represent the surface reactivity of the particles, including ultrafine particles. To characterize regional and seasonal behaviors of the LDSA in the atmosphere and the factors controlling them, we measured the LDSA concentrations, using the DC method, and other physicochemical properties at three sites in Japan, including urban and rural areas. Comparisons among the three sites in the same season showed the highest LDSA concentration at the urban site Fukuoka, due to high concentrations and low particle sizes. In addition, this urban site frequently recorded high LDSA concentrations with high specific LDSAs, which represents the high contribution of ultrafine particles to the LDSA concentration. This is because the site was dominated by ultrafine black carbon particles emitted from surrounding cities, along with low contribution of long-range transported particles from the continent. In contrast, the dominance of these transported particles, which is typically observed at the three sites during this season, caused the specific LDSA to fall within a low and narrow range. However, even at rural areas, the active formation of organic particles in the summer caused high specific LDSAs, although their concentrations were low. Thus, the particles in urban areas, where ultrafine particles are probably emitted with high concentration from surrounding cities, have the potential to cause a greater adverse effect on human health even for the identical LDSA concentration. In addition, our observations showed that the LDSA of atmospheric aerosol particles measured by the DC method can be roughly represented by the theoretical LDSA of particles assuming spherical shape. Our characterizations using the specific LDSAs provide useful information for applying the LDSAs as the toxicity indicator of atmospheric aerosol particl

关键词： Physicochemical properties

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Recent Development of Algal Biochar for Contaminant Remediation and Energy Application: A State-of-the Art Review

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Current Pollution Reports 2022年第1期9卷 73-89页

作者： Nguyen, Thanh-Binh Nguyen, Van-Truc Hoang, Hong-Giang Cao, Ngoc-Dan-Thanh Nguyen, Thanh-Tin Vo, Thi-Dieu-Hien Nguyen, Ngoc-Kim-Qui Pham, Mai-Duy-Thong Nghiem, Duc-Long Vo, Thi-Kim-Quyen Dong, Cheng-Di Bui, Xuan-Thanh Institute of Aquatic Science and Technology National Kaohsiung University of Science and Technology Kaohsiung City Taiwan Department of Environmental Sciences Saigon University Ho Chi Minh City Vietnam Faculty of Medicine Dong Nai Technology University Bien Hoa Vietnam Department of Bioenviromental System Engineering National Taiwan University Taipei Taiwan Key Laboratory of Advanced Waste Treatment Technology Ho Chi Minh City University of Technology (HCMUT) Ho Chi Minh City Vietnam School of Earth Sciences and Environmental Engineering Gwangju Institute of Science and Technology Gwangju Korea Faculty of Environmental and Food Engineering Nguyen Tat Thanh University Ho Chi Minh City Vietnam Vietnam National University Ho Chi Minh (VNU-HCM) Ho Chi Minh City Vietnam Centre for Technology in Water and Wastewater School of Civil and Environmental Engineering University of Technology Sydney Sydney Australia Faculty of Biology and Environment - Natural Resources and Climate Change Ho Chi Minh City University of Food Industry (HUFI) Ho Chi Minh City Vietnam

Algae, as a low-impact aquatic feedstock, is regarded as a promising biomass for producing valuable biofuel, syngas, and biochar. Algae, on the other hand, are mostly composed of lipids, proteins, and carbohydrates, as opposed to lignocellulosic biomass. Algal species have a faster growth rate and higher photosynthetic efficiency than terrestrial plants, making them an excellent alternative for a sustainable environment. Algal biomass has shown great promise as a raw material for biochar production in recent years. Algae biochar has a high potential for use as a material for contamination remediation and energy application. This review paper summarizes the applicability of algal biochar, algal biochar modification strategies, fabrication methods, and algal biochar properties. Carbon sequestration, sediment and water treatment, and energy applications are all thoroughly discussed. More emphasis should be placed on practical applications, and more research should be conducted to address existing problems.

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Efficient removal of congo red dye using activated lychee peel biochar supported Ca-Cr layered double hydroxide

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environmental Nanotechnology, Monitoring and Management 2023年 20卷

作者： Cruz, Estevan D. Missau, Juliano Collinson, Simon R. Tanabe, Eduardo H. Bertuol, Daniel A. Environmental Processes Laboratory (LAPAM) Chemical Engineering Department Federal University of Santa Maria Santa Maria Brazil School of Life Health & Chemical Sciences Faculty of Science Technology Engineering & Mathematics The Open University Walton Hall England Milton Keynes MK7 6AA United Kingdom

Congo red is a known carcinogenic and mutagenic dye, so its presence in bodies of water is dangerous. The present work aims to synthesize and characterize a layered double hydroxide (LDH)-biochar composite and evaluate its application in the adsorption of Congo red dye (CR). CaCr/LDH was anchored over lychee activated biochar through coprecipitation. The composite was characterized using scanning electronic mapping (SEM), energy-dispersive spectrometer SEM (EDS-SEM), Fourier transform infrared (FT-IR), X-ray powder diffractometry (XRD) and Brunauer-Emmet-Teller (BET). The effect of pH, adsorption kinetics, isotherms, ionic strength, and thermodynamic parameters were evaluated. The pH results show a stable adsorption capacity in a useful range of pH (pH 4–9). Adsorption kinetics fitted the Elovich model, suggesting a heterogeneous system. The maximum adsorption capacity value (q_e) calculated was achieved by applying the Sips model, with 631.1 mg g⁻¹ at 50 °C. Ionic strength experiments show that the capacity increased with increasing NaCl concentration, which is desirable for real use as other ions are commonly present in dye wastewater. π-π interactions and hydrogen bonding seems to be involved in the adsorption mechanisms. CaCr-LDH/lychee biochar has better structure stability over several adsorption–desorption cycles with anionic exchange regeneration (in comparison with thermal regeneration), wide operational pH and high adsorption capacity. Therefore, this new composite presents a very good potential for the adsorption of dye from waste- or ground- water. © 2023

关键词： Adsorption Biochar Composite Congo red dye LDH

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Design of an active mass damper to simultaneously mitigate seismic acceleration in superstructures and substructures of a mid-story isolation building 15

Design of an active mass damper to simultaneously mitigate s...

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15th International Conference on Motion and Vibration Control, MoViC 2020

作者： Tomiyoshi, Yuta Takahashi, Masaki Kotsuki, Sachie Kambara, Hiroshi Fukukita, Akira School of Science for Open and Environmental Systems Faculty of Science and Technology Keio University 3-14-1 Hiyoshi Kohoku-ku Kanagawa Yokohama223-8522 Japan System Design Engineering Faculty of Science and Technology Keio University 3-14-1 Hiyoshi Kohoku-ku Kanagawa Yokohama223-8522 Japan Center for Safety and Reliability Engineering Institute of Technology Shimizu Corporation 3-4-17 Etchujima Koto-ku Tokyo135-8530 Japan

This paper proposes a design method for the active mass damper (AMD) applied to super high-rise buildings designed as a building mass damper (BMD)The BMD is a seismic response control devicewitha soft layer at a relatively high position in the building,and makes the part above the soft layer work as a tuned mass damper. It is designed to decrease the seismic response of the part below the soft layer by amotion of the superstructure. However, since the displacement of the soft layer is limited, any displacement exceeding the allowable clearance must be suppressed. The displacement of the soft layer can be reduced withadditional damping and/or springs. However, the addition ofdamping and/or springshasthe countereffect of increasing the seismic response of the building. To solve this problem, we proposed the design method for the AMD,which aims to make the BMD with additional damper and/or springsact like a BMD with no additional element. The effectivenessof the proposed method was demonstrated through numerical calculations. © 2020 The Japan Society of Mechanical Engineers.

关键词： Seismic response

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