Steinberg symbols and reciprocity sheaves

We study multilinear symbols on fields taking values in reciprocity sheaves. We prove that any such symbol satisfying natural axioms automatically has Steinberg-type relations, which is a manifestation of the geometry of modulus pairs lying behind.Comment: 28 pages, 4 figures, to appear in Ann. K-Theor

Zeroth A1\mathbb{A}^1-homology of smooth proper varieties

We give an explicit formula for the zeroth $\mathbb{A}^1$-homology sheaf of a smooth proper variety. We also provide a simple proof of a theorem of Kahn-Sujatha which describes hom sets in the birational localization of the category of smooth varieties.Comment: 9 page

Thermoelectric effect of skyrmion crystal confined in a magnetic disk

We theoretically propose that an electric voltage can be generated by thermal gradient with a rotating skyrmion crystal confined in a magnetic disk. We find that the rotation of skyrmion crystal induced by diffusive thermal magnon currents in the presence of temperature gradient gives rise to spinmotive forces in the radial direction through coupling to conduction-electron spins. The amplitude of generated spinmotive force is larger for a larger temperature gradient at a lower temperature. The proposed phenomenon can be exploited as spintronics-based thermoelectric devices to realize the conversion of heat to electricity.Comment: 6 pages, 4 figure

Effect of the degree of acetylation on the physicochemical properties of α-chitin nanofibers

Available online 27 March 2020.The effective utilization of abundant α-chitin resources for materials engineering applications requires methods for controlling the physicochemical properties of α-chitin nanofiber (NF) dispersions. Herein, the relationship between the degree of acetylation (DA) of α-chitin and the physicochemical properties of α-chitin nanofibers (α-ChNFs) was investigated. α-Chitin with different DAs was prepared by varying the deacetylation treatment time. These α-chitin samples were disintegrated into NFs using wet pulverization. The average width of the α-ChNFs decreased with decreasing DA. Furthermore, the transmittance and viscosity of the α-ChNF dispersions increased with decreasing DA. We successfully developed a simple model for estimating the average width of α-ChNFs with different DAs. These results indicate that the DA is an effective parameter for defining and controlling the physicochemical properties of α-ChNFs.ArticleInternational Journal of Biological Macromolecules.155:350-357(2020)journal articl

Does This Code Change Affect Program Behavior? Identifying Nonbehavioral Changes with Bytecode

A. Maejima, Y. Higo, J. Matsumoto and S. Kusumoto, "Does This Code Change Affect Program Behavior? Identifying Nonbehavioral Changes with Bytecode," 2020 IEEE 44th Annual Computers, Software, and Applications Conference (COMPSAC), Madrid, Spain, 2020, pp. 1103-1104, doi: 10.1109/COMPSAC48688.2020.0-119.2020 IEEE 44th Annual Computers, Software, and Applications Conference (COMPSAC) [13-17 July 2020, Madrid, Spain