A5083278821- Physics of Superconductivity and Magnetism
- Earthquake and Tsunami Effects
- Theoretical and Computational Physics
- Geotechnical Engineering and Soil Stabilization
- Geotechnical Engineering and Soil Mechanics
- Magnetic properties of thin films
- Geotechnical Engineering and Underground Structures
- Liquid Crystal Research Advancements
- Photorefractive and Nonlinear Optics
- Advanced Condensed Matter Physics
- Quantum many-body systems
- earthquake and tectonic studies
- Quantum, superfluid, helium dynamics
- Earthquake and Disaster Impact Studies
- Quantum and electron transport phenomena
- Photonic and Optical Devices
- Advanced Optical Imaging Technologies
- Photonic Crystals and Applications
- Nonlinear Optical Materials Research
- Coastal wetland ecosystem dynamics
- Grouting, Rheology, and Soil Mechanics
- Magnetic and transport properties of perovskites and related materials
- Cold Atom Physics and Bose-Einstein Condensates
- Orbital Angular Momentum in Optics
- Coastal and Marine Dynamics
Tetra Corporation (United States)
2009-2025
Konkuk University
2025
Kitami Institute of Technology
2011-2024
Kyoto University
2011-2024
The University of Tokyo
2023-2024
Shizuoka University
2011-2024
Tokyo University of Agriculture and Technology
2024
Tokyo University of Science
2023
Hokkaido University
2020-2022
RIKEN Center for Emergent Matter Science
2016-2021
The microscopic mechanism of the matching effect in a superconductor, which manifested itself as production peaks or cusps critical current at specific values applied magnetic field, was investigated with Lorentz microscopy to allow direct observation behavior vortices niobium thin film having regular array artificial defects. Vortices were observed form and consequently rigid lattices its multiples, fractions. dynamic furthermore revealed that most difficult move whereas excess moved easily.
The 2011 Great East Japan Earthquake caused the severe liquefaction of reclaimed lands in Tokyo Bay area, from Shinkiba through Urayasu, Ichikawa and Narashino Cities to Chiba City. However, that had been improved by sand compaction pile method, gravel drain method or other methods did not liquefy. liquefy constructed after around 1966 with soil dredged bottom bay. filled soils were estimated have liquefied earthquake. Seismic intensities zones high, although grounds covered boiled sand....
MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 296:115-128 (2005) - doi:10.3354/meps296115 Variability of diet-tissue isotopic fractionation in estuarine macrobenthos Hisashi Yokoyama1,*, Akio Tamaki2, Kazuyuki Harada2, Katsumasa Shimoda2,Kazuki Koyama2, Yuka Ishihi1 1National Research Institute Aquaculture, Fisheries Agency, Nansei, Mie 516-0193,...
Theoretical analysis and Lorentz transmission electron microscopy (LTEM) investigations in an FeGe wedge demonstrate that chiral twists arising near the surfaces of noncentrosymmetric ferromagnets [Meynell et al., Phys. Rev. B 90, 014406 (2014)] provide a stabilization mechanism for magnetic Skyrmion lattices helicoids cubic helimagnet nanolayers. The phase diagram obtained freestanding nanolayers shows magnetization processes differ fundamentally from those bulk helimagnets are...
Japan was hit by the tsunami generated greatest earthquake in history of Japan. The authors conducted post-tsunami field survey Miyagi prefecture immediately after event to measure inundation depth and investigate damaged buildings. Most buildings surveyed were wooden houses could be classified into 4 damage levels. primary data levels obtained from used create fragility curves, which described degree structural as a function hydrodynamic characteristics inundation. developed curves show...
To examine the validity of scenario deconfined critical phenomena, we carry out a quantum Monte Carlo simulation for SU($N$) generalization Heisenberg model with four-body and six-body interactions. The phase transition between N\'eel valence-bond solid phases is characterized $N=2$, 3, 4 on square honeycomb lattices. While finite-size scaling analysis works well up to maximum lattice size ($L=256$) indicates continuous nature transition, clear systematic change towards first-order observed...
Secure aggregation of local learning model parameters is crucial for achieving privacy-preserving federated learning. This paper presents a novel and practical method that effectively combines the advantages masking-based with those homomorphic encryption-based techniques. Each node conceals its using randomly selected mask, independently chosen, thereby eliminating need additional computations to generate or exchange mask values other nodes. Instead, each homomorphically encrypts random own...
Magnetic lines of force penetrating a superconducting Nb thin film have been directly observed by electron holography. The tilted specimen is examined in the ``transmission'' mode that allows 2D magnetic flux distribution to be discerned an interference micrograph. phase wave transmitted through has quantitatively measured. It was found array tiny regions, where rapidly changed, coincided spatially with spots Lorentz microscopy, and furthermore, these regions were identified quantized...
World-line quantum Monte Carlo methods are reviewed with an emphasis on breakthroughs made in recent years. In particular, three algorithms -- the loop algorithm, worm and directed-loop algorithm for updating world-line configurations presented a unified perspective. Detailed descriptions of specific cases also given.
To determine the universality class of critical phenomena, we propose a method statistical inference in scaling analysis phenomena. The is based on Bayesian statistics, most specifically, Gaussian process regression. It assumes only smoothness function, and it does not need form. We demonstrate this for finite-size Ising models square triangular lattices. Near point, comparable accuracy to least-square method. In addition, works well data which cannot apply with polynomial low degree. By...
Abstract In two-dimensional (2D) NbSe 2 crystal, which lacks inversion symmetry, strong spin-orbit coupling aligns the spins of Cooper pairs to orbital valleys, forming Ising (ICPs). The unusual spin texture ICPs can be further modulated by introducing magnetic exchange. Here, we report unconventional supercurrent phase in van der Waals heterostructure Josephson junctions (JJs) that couples across an atomically thin insulator (MI) Cr Ge Te 6 . By constructing a superconducting quantum...
Vortices in ${\mathrm{Bi}}_{2}$${\mathrm{Sr}}_{1.8}$${\mathrm{CaCu}}_{2}$${\mathrm{O}}_{\mathit{x}}$ thin films were directly observed by Lorentz microscopy as the sample temperature T was raised from 4.5 K under fixed magnetic fields H. Each time raised, vortices moved, eventually to settle a new static configuration. began form regular lattice at depending on The vortex-lattice image remained visible until it gradually faded away around an irreversibility ${\mathit{T}}^{\mathrm{*}}$(H)....
The two-dimensional SU(N) quantum antiferromagnet, a generalization of the Heisenberg model, is investigated by Monte Carlo simulations. ground state for N<or=4 found to be Néel type with broken symmetry, whereas it Spin-Peierls N>or=5 lattice translational invariance. Our computation magnetization and dimerization order parameter shows absence intermediate spin-liquid phase.
MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 304:101-116 (2005) - doi:10.3354/meps304101 Isotopic evidence for phytoplankton as amajor food source macrobenthos on an intertidal sandflat in Ariake Sound, Japan Hisashi Yokoyama1,*, Akio Tamaki2, Kazuki Koyama2, Yuka Ishihi1, Katsumasa Shimoda2, Kazuyuki Harada2 1National Research Institute of Aquaculture,...
Tsunami height survey was conducted immediately after the 2003 Tokachi-oki earthquake. Results of show that largest tsunami 4 m to east Cape Erimo, around Bansei-onsen, and locally at Mabiro. The results also distribution earthquake is clearly different from 1952 earthquake, suggesting source areas Tokachioki earthquakes. Numerical simulation carried out using slip estimated by Yamanaka Kikuchi (2003). overall pattern observed along coast explained computed ones although heights are slightly...
The fabrication of a hydrogen isotope enrichment system is essential for the development industrial, medical, life science, and nuclear fusion fields, therefore, efficient techniques with high separation factor economic feasibility are still being explored. Herein, we report hydrogen/deuterium (H/D) ability polymer electrolyte membrane electrochemical pumping (PEM-ECHP) using heterogeneous electrode consisting palladium graphene layers (PdGr). By mass spectroscopic analysis, demonstrate...
The tree tensor network (TTN) provides an essential theoretical framework for the practical simulation of quantum many-body systems, where structure defined by connectivity isometry tensors plays a crucial role in improving its approximation accuracy. In this paper, we propose TTN algorithm that enables us to automatically optimize local reconnections isometries suppress bipartite entanglement entropy on their legs. can be seamlessly implemented such conventional approach as density-matrix...
Through Quantum Monte Carlo simulation, we study the biquadratic-interaction model with SU(2) symmetry in two and three dimensions. The zero-temperature phase diagrams for cases are identical exhibit an intermediate characterized by finite quadrupole moment, agreement mean-field type arguments semi-classical theory. In dimensions, demonstrate that quadrupolar regime has a transition at temperature. contrast to predictions theories, turns out be of second order. We also examine critical...
Liquefaction occurred at many sites along Osaka Bay during the 1995 Hyogoken-Nambu earthquake (the Great Hanshin-Awaji disaster) and caused extensive damage to buildings, bridges, quay walls, etc. The authors conducted detailed site surveys liquefied found a remarkable phenomenon. Some zones in two big artificial islands, Port Island Rokko Island, Kobe City, did not liquefy even though surrounding islands liquefied. Damage buildings ground subsidence these were also less severe than zones....