121 research outputs found
Impact of the Formal Opening of the AKASHI -Grand bridge on the Business of Tokushima-Area Wholesalers,and Their Collaboration Efforts in Physical Distribution and Information-Processing
No full textThe formal opening of the AKASHI-Grandbridge in 1998, will produce a serious effect on the business activities of Tokushima-area wholesalers while increasing its business chances. What are the concerns? How we can overcome them? The author concludes that only wholesalers' collaboration efforts in the physical distribution network making use of high technology information will secure their sustainable and successful future.4KJ00000202952地域研究BUSSINESS COMMUNITY STUDYjournal articl
AtomREM: Non-empirical seeker of the minimum energy escape paths on many-dimensional potential landscapes without coarse graining
No full textRecently a non-empirical stochastic walker algorithm has been developed to search for the minimum-energy escape paths from the minima of the potential surface (Akashi and Nagornov, 2018; Nagornov and Akashi, 2019). This method is based on the Master equation for the distribution function of the atomic configuration which has a nature to seek the reaction path up along the valley of the potential surface. This paper introduces AtomREM (Atomistic Rare Event Manager), which is an MPI parallelized solver program package for executing this method, which yields reaction pathways in terms of the microscopic evolution of atomic positions. It is open-source and released under the GNU General Public License (GPL). A feature AtomREM interfaces with the LAMMPS Molecular Dynamics Simulator as a library of versatile potential functions for application to various systems. Examples of the applications to molecular and solid systems are presented
Illuminating the Bragg intersections as roots of Dirac nodal lines and high-order van Hove singularities
No full textWe theoretically reexamine nearly uniform electron models with weak crystalline potentials. In particular, we theorize the modulation of the plane-wave branches at linear regions where multiple Bragg planes intersect. Any such linear intersections involve three or more plane-wave branches diffracted by the periodic potential. Small inter-branch interactions can yield various crossing and anticrossing singularities with promised breakdown of the quadratic approximation, extending alongside the intersection lines. Most of the intersections run in low-symmetric paths in the Brillouin zone and therefore we cannot completely characterize their electronic states with standard band structure plotting methods. The present theory reveals a general mechanism in nearly uniform systems to induce the Dirac nodal lines and van-Hove singularities with broken quadratic band approximation in three dimensions, which may host a variety of anomalous low-energy electronic properties. We apply the theory to a recently discovered high temperature superconductor HS to interpret the enigmatic density-of-state (DOS) peaking therein. The results show how and {\it why there} the continuous saddle points--the source of the peaked DOS--emerge, as well as reveal the companion Dirac nodal lines hidden in the conduction bands.8 pages, 7 figures: Submitted; Ver2: 12 pages, 8 figures, accepted versio
Large intrinsic spin Hall conductivity in orthorhombic tungsten
No full textIn this paper, we explored metastable phases showing large intrinsic spin Hall conductivity (SHC) in bulk tungsten (W) using a crystal structure search scheme based on an evolutionary algorithm (EA) and first-principles calculations. W has been known to have the most stable phase with the body-centered cubic (bcc) structure (α-W) and the metastable phase with a cubic Pm￣3n structure (β-W) and show the enhancement of SHC in β-W. As the results of the EA search, we obtained 15 metastable structures in addition to α-W and β-W and found that orthorhombic Fddd and Cmcm structures show larger SHC at the Fermi level. The
Fddd structure is formed by adding a fourfold helical distortion along the [110] direction to bcc and the Cmcm structure is obtained by further distortion of Fddd. Although the energies are higher by about 300,meV/atom than that of bcc, the SHC values at the Fermi level show 1710,(?/e)(Ωcm)?1 for Fddd and 1573,(?/e)(Ωcm)?1 for Cmcm, which are almost twice as large as that of α-W and exceed 1455,(?/e)(Ωcm)?1 calculated for β-W.journal articl
Lattice dielectric properties of rutile TiO2: First-principles anharmonic self-consistent phonon study
No full textWe calculate the lattice dielectric function of strongly anharmonic rutile TiO2 from ab initio anharmonic lattice dynamics methods. Since an accurate calculation of the Γ point phonons is essential for determining optical properties, we employ the modified self-consistent approach, including third-order anharmonicity as well as fourth-order anharmonicity. The resulting optical phonon frequencies and linewidths at the Γ point much better agree with experimental measurements than those from a perturbative approach. We show that the four-phonon scattering process contributes as much as the third-order anharmonic term to phonon linewidths. Furthermore, incorporating the frequency dependence of phonon linewidth reveals that experimentally known but unidentified peaks of the dielectric function are due to two-phonon process. This work emphasizes the importance of a self-consistent approach in predicting the optical properties of highly anharmonic materials.journal articl
Semiconducting electronic structure of the ferromagnetic spinel HgCr2Se4 revealed by soft-x-ray angle-resolved photoemission spectroscopy
No full textWe study the electronic structure of the ferromagnetic spinel HgCr2Se4 by soft-x-ray angle-resolved photoemission spectroscopy (SX-ARPES) and first-principles calculations. While a theoretical study has predicted that this material is a magnetic Weyl semimetal, SX-ARPES measurements give direct evidence for a semiconducting state in the ferromagnetic phase. Band calculations based on the density functional theory with hybrid functionals reproduce the experimentally determined band gap value, and the calculated band dispersion matches well with ARPES experiments. We conclude that the theoretical prediction of a Weyl semimetal state in HgCr2Se4 underestimates the band gap, and this material is a ferromagnetic semiconductor.journal articl
POT1a deficiency in mesenchymal niches perturbs B-lymphopoiesis
No full textAbstract Protection of telomeres 1a (POT1a) is a telomere binding protein. A decrease of POT1a is related to myeloid-skewed haematopoiesis with ageing, suggesting that protection of telomeres is essential to sustain multi-potency. Since mesenchymal stem cells (MSCs) are a constituent of the hematopoietic niche in bone marrow, their dysfunction is associated with haematopoietic failure. However, the importance of telomere protection in MSCs has yet to be elucidated. Here, we show that genetic deletion of POT1a in MSCs leads to intracellular accumulation of fatty acids and excessive ROS and DNA damage, resulting in impaired osteogenic-differentiation. Furthermore, MSC-specific POT1a deficient mice exhibited skeletal retardation due to reduction of IL-7 producing bone lining osteoblasts. Single-cell gene expression profiling of bone marrow from POT1a deficient mice revealed that B-lymphopoiesis was selectively impaired. These results demonstrate that bone marrow microenvironments composed of POT1a deficient MSCs fail to support B-lymphopoiesis, which may underpin age-related myeloid-bias in haematopoiesis
Stochastic Formalism for Thermally Driven Distribution Frontier: A Nonempirical Approach to the Potential Escape Problem
No full textSounds of parting and longing : music and narrative in Genji monogatari
No full textGenji monogatari is one of the most important works of Japanese premodern literature, written in the eleventh century by the court lady known as Murasaki Shikibu (c. 973–1014). This thesis will focus on the musical aspects of the narrative, namely performance scenes and the accompanying dialogues and poetic exchanges. While the abundance of musical scenes in the Genji is widely recognized in scholarship, there are still many aspects to be further researched. My primary goal is to show how music is a constitutive element of the text that deeply impacts narrative development and the relationship between characters. I will focus on the scenes concerning the Akashi Lady, a prominent female character in the tale who stands out for her close connection with music.
In Chapter 1, I introduce gagaku, the musical tradition found in The Tale of Genji, giving a brief overview of its history, main genres, and a description of the instruments used. In Chapter 2, the core of this thesis, I analyze selected excerpts from Chapter 13 “Akashi,” and discuss scenes from later chapters that relate to the Akashi narrative, showing how music is an inseparable part of the Akashi Lady’s character which plays a crucial role in establishing her relationship with the protagonist Genji, while contributing to her path of social ascension. Through a close reading of the text and consideration of scholarship on the Genji, gagaku, and on music in the Genji, I demonstrate how music is conceived by the author as a narrative device. By arguing that music in the Genji should be treated as a form of narrative and not as a separate aspect that adds certain characteristics to the text, I hope to expand the interpretive possibilities not only of music, but other artistic manifestations present in the work.Arts, Faculty ofAsian Studies, Department ofGraduat
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