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6. Electrically Controlled All‐Antiferromagnetic Tunnel Junctions on Silicon with Large Room‐Temperature Magnetoresistance.

Author

Shi, Jiacheng, Arpaci, Sevdenur, Lopez‐Dominguez, Victor, Sangwan, Vinod K., Mahfouzi, Farzad, Kim, Jinwoong, Athas, Jordan G., Hamdi, Mohammad, Aygen, Can, Arava, Hanu, Phatak, Charudatta, Carpentieri, Mario, Jiang, Jidong S., Grayson, Matthew A., Kioussis, Nicholas, Finocchio, Giovanni, Hersam, Mark C., and Khalili Amiri, Pedram

Published
2024
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10. Validation and analysis of the Polair3D v1.11 chemical transport model over Quebec.

Author

Yamanouchi, Shoma, Gamage, Shayamilla Mahagammulla, Torbatian, Sara, Zalzal, Jad, Minet, Laura, Smargiassi, Audrey, Liu, Ying, Liu, Ling, Azargoshasbi, Forood, Kim, Jinwoong, Kim, Youngseob, Yazgi, Daniel, and Hatzopoulou, Marianne

Subjects
AIR pollutants, CHEMICAL models, AIR pollution, AIR quality, DEVELOPED countries, PUBLIC health
Abstract

Air pollution is a major health hazard, and while air quality overall has been improving in industrialized nations, pollution is still a major economic and public health issue, with some species, such as ozone (O 3), still exceeding the standards set by governing agencies. Chemical transport models (CTMs) are valuable tools that aid in our understanding of the risks of air pollution both at local and regional scales. In this study, the Polair3D v1.11 CTM of the Polyphemus air quality modeling platform was set up over Quebec, Canada, to assess the model's capability in predicting key air pollutant species over the region, at seasonal temporal scales and at regional spatial scales. The simulation by the model included three nested domains, at horizontal resolutions of 9 km by 9 km and 3 km by 3 km, as well as two 1 km by 1 km domains covering the cities of Montréal and Québec. We find that the model captures the spatial variability and seasonal effects and, to a lesser extent, the hour-by-hour or day-to-day temporal variability for a fixed location. The model at both the 3 km and the 1 km resolution struggled to capture high-frequency temporal variability and showed large variabilities in correlation and bias from site to site. When comparing the biases and correlation at a site-wide scale, the 3 km domain showed slightly higher correlation for carbon monoxide (CO), nitrogen dioxide (NO 2), and nitric oxide (NO), while ozone (O 3), sulfur dioxide (SO 2), and PM 2.5 showed slight increases in correlation at the 1 km domain. The performance of the Polair3D model was in line with other models over Canada and comparable to Polair3D's performance over Europe. [ABSTRACT FROM AUTHOR]

Published
2024
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20. Enhancing Compressive Strength in Cementitious Composites through Effective Use of Wasted Oyster Shells and Admixtures.

Author

Cha, Inyeong, Kim, Jinwoong, and Lee, Heeyoung

Subjects
OYSTER shell, CEMENT composites, COMPRESSIVE strength, SILICA fume, POLLUTION, SAND, POWDERS
Abstract

Wasted oyster shells generate environmental pollution and odor, thereby causing inconvenience to people. In addition, low-quality aggregates are generated owing to the lack of sand. To address these problems, cementitious composites that replaced sand with oyster shell powder were fabricated in this study, and a total 120 specimens were fabricated (specimen size: 50 × 50 × 50   m m 3 ). The oyster shell substitution rate for sand, admixture type, and presence or absence of admixture were set as the experimental parameters. Herein, 0, 30, 70, and 100% of sand was replaced with oyster shell powder to examine the compressive strength of the cementitious composites according to the oyster shell powder content. The experiment results confirmed the decrease in the compressive strength of the cementitious composite with an increase in the oyster shell powder content. In the case of the cementitious composites mixed with oyster shell powder, silica fume, blast furnace slag, and an air-entraining water-reducing agent, the compressive strength increased by up to 30% with an increase in the oyster shell powder content. The results of cementitious composites containing oyster shell powder and admixture fabricated in this study indicate the potential of oyster shells as a new construction material that can replace sand. [ABSTRACT FROM AUTHOR]

Published
2023
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38. Robust A-type order and spin-flop transition on the surface of the antiferromagnetic topological insulator MnBi$_2$Te$_4$

Author

Sass, Paul M., Kim, Jinwoong, Vanderbilt, David, Yan, Jiaqiang, and Wu, Weida

Subjects
Condensed Matter - Materials Science, Condensed Matter - Strongly Correlated Electrons, Strongly Correlated Electrons (cond-mat.str-el), Materials Science (cond-mat.mtrl-sci), FOS: Physical sciences, Condensed Matter::Strongly Correlated Electrons
Abstract

Here we present microscopic evidence of the persistence of uniaxial A-type antiferromagnetic order to the surface layers of MnBi$_2$Te$_4$ single crystals using magnetic force microscopy. Our results reveal termination-dependent magnetic contrast across both surface step edges and domain walls, which can be screened by thin layers of soft magnetism. The robust surface A-type order is further corroborated by the observation of termination-dependent surface spin-flop transitions, which have been theoretically proposed decades ago. Our results not only provide key ingredients for understanding the electronic properties of the antiferromagnetic topological insulator MnBi$_2$Te$_4$, but also open a new paradigm for exploring intrinsic surface metamagnetic transitions in natural antiferromagnets., 11 pages, 4 figures

Published
2020

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