Takumi Yamada

ORCID: 0009-0005-9071-3999
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About
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Research Areas
  • Geometry and complex manifolds
  • Geometric Analysis and Curvature Flows
  • Advanced Radiotherapy Techniques
  • Advanced Algebra and Geometry
  • Algebraic Geometry and Number Theory
  • Polymer Nanocomposites and Properties
  • Geometric and Algebraic Topology
  • Perovskite Materials and Applications
  • Urban and spatial planning
  • Polymer composites and self-healing
  • Optical properties and cooling technologies in crystalline materials
  • Solid-state spectroscopy and crystallography
  • Balance, Gait, and Falls Prevention
  • Catalytic Processes in Materials Science
  • Catalysis for Biomass Conversion
  • Radiation Therapy and Dosimetry
  • Polyoxometalates: Synthesis and Applications
  • Polymer crystallization and properties
  • Cerebral Palsy and Movement Disorders
  • Supercapacitor Materials and Fabrication
  • Medical Imaging Techniques and Applications
  • Photoreceptor and optogenetics research
  • Radiation Dose and Imaging
  • Synthesis and Properties of Aromatic Compounds
  • Cerebrovascular and Carotid Artery Diseases

Shimane University
2011-2024

The University of Tokyo
2019-2023

Kyoto University Institute for Chemical Research
2022

Tokyo Metropolitan University
2015-2022

Kyoto University
2022

Japan Advanced Institute of Science and Technology
2021-2022

Niigata University Medical and Dental Hospital
2015-2021

Nagaoka University of Technology
2014-2020

Niigata University
2008-2019

Meijo University
2019

A new synthetic method is demonstrated for transforming rice husks into bulk amounts of graphene through its calcination and chemical activation. The sample consists crystalline nano-sized corrugated individual sheets; the material generally contains one, two, or a few layers, domains are typically observed in monolayers containing topological defects within hexagonal lattice edges. Both types graphenes exhibit atomically smooth surfaces As service to our authors readers, this journal...

10.1002/smll.201400017 article EN Small 2014-03-27

Abstract In conventional stereotactic radiosurgery (SRS), treatment of multiple brain metastases using isocenters is time‐consuming resulting in long dose delivery times for patients. A single‐isocenter technique has been developed which enables the simultaneous irradiation targets at one isocenter. This requires accurate positioning patient to ensure optimal coverage. We evaluated effect six degrees freedom (6DoF) setup errors setups on SRS distributions a technique. used simulated...

10.1002/acm2.13081 article EN cc-by Journal of Applied Clinical Medical Physics 2020-10-29

Effects of chiral alkyl side chains in poly(9,9-dialkyl-fluorene-2,7-vinylene)s [PFVs, (S)-3-methylpentyl (3mpe), (S)-4-methylhexyl (4mhex), (S)-5-methylheptyl (5mhep), (S)-6-methyloctyl (6moct), and (S)-3,7-dimethyloctyl (dmo)] toward aggregation-induced circular dichroism (AICD) circularly polarized luminescence (AICPL) CD/CPL spectra solution thin film have been explored. The (all-trans) PFV samples with similar conjugation repeat units containing well-defined (vinyl) end groups were...

10.1021/acs.macromol.8b00241 article EN Macromolecules 2018-03-15

Purpose We sought to develop machine learning models detect multileaf collimator (MLC) modeling errors with the use of radiomic features fluence maps measured in patient‐specific quality assurance (QA) for intensity‐modulated radiation therapy (IMRT) an electric portal imaging device (EPID). Methods Fluence EPID 38 beams from 19 clinical IMRT plans were assessed. Plans various degrees error MLC parameters [i.e., transmission factor (TF) and dosimetric leaf gap (DLG)] positional comparison...

10.1002/mp.14699 article EN Medical Physics 2020-12-31

Abstract The changes in dose distribution caused by backscatter radiation from a common commercial dental alloy (Au–Ag–Pd alloy; DA) were investigated to identify the optimal material and thicknesses of device (DD) for effective prevention mucositis. To this end, 1 cm3 DA was irradiated with 6-MV X-ray beam (100 MU) field size 10 × cm2 using Novalis TX linear accelerator. Ethylene vinyl acetate copolymer, polyolefin elastomer, polyethylene terephthalate (PET) selected as DD materials. depth...

10.1093/jrr/rrw092 article EN cc-by-nc Journal of Radiation Research 2016-09-01

The relationship of the Functional Reach Test (FRT) value with Center Pressure Excursion (COPE) and physical function remains unclear, would be influenced by different population characteristics movement patterns used in FRT. Therefore, we explored between FRT COPE healthy young older individuals classified according to patterns. In 21 participants (42 sides) 20 (40 sides), three-dimensional motion analysis was performed during assessments. were assigned two clusters after performing a...

10.1371/journal.pone.0266195 article EN cc-by PLoS ONE 2022-03-31

10.1016/j.topol.2004.09.002 article EN Topology and its Applications 2004-12-15

Proteorhodopsin (PR) is an outward light-driven proton pump observed in marine eubacteria. Despite many structural and functional similarities to bacteriorhodopsin (BR) archaea, which also acts as pump, the mechanism of photoinduced release uptake different between two H+-pumps. In this study, we investigated pH dependence photocycle transfer PR reconstituted with phospholipid membrane under alkaline conditions. Under these conditions, medium increased, a blue-shifted photoproduct (defined...

10.1021/acs.biochem.5b01196 article EN Biochemistry 2016-01-26

We executed the topological data analysis of labyrinth magnetic domain structure to visualize pinning site during magnetization reversal process. utilized persistent homology extract feature structure, and principal component was used construct correlation between persistence diagram hysteresis loop. As a result, we could automatically as defect on original structure.

10.1380/vss.62.153 article EN Vacuum and Surface Science 2019-03-09

Cross orientation between lamellae and amorphous chains was generated by forming residual crystals during extrusion melt stretching under temperature-controlled processing conditions in a thermoplastic polyester elastomer (TPEE). Some were not completely melted at certain temperature slightly higher than the melting of sample heating process, survived are called crystals. The TPEE exhibited prolonged relaxation owing to formation network structure composed weak affected processability...

10.1021/acsapm.2c00508 article EN ACS Applied Polymer Materials 2022-08-24

Abstract 5‐Hydroxymethylfurfural (HMF) is an important bio‐based chemical, which has been recognized as a key platform chemical for furan‐based polymers, biomass‐derived fuels, fine chemicals, and pharmaceuticals. Catalytic conversion of fructose into HMF reaction, the development efficient heterogeneous catalysts with high selectivity towards highly desired. In this study, several porous ionic crystals Keggin‐type polyoxometalate [PW 12 O 40 ] 3− macrocation [Cr 3 O(OOCCH 2 CN) 6 (H O) +...

10.1002/cctc.201900614 article EN ChemCatChem 2019-04-23

In this paper we investigate the Hard Lefschetz property on certain compact symplectic solvmanifolds and constmct pseudo-Kähler which do not have property. We also construct holomorphic structures, hypercomplex structures pseudo-hyperkähler stmctures solvmanifolds.

10.21099/tkbjm/1496164895 article EN Tsukuba Journal of Mathematics 2005-06-01

A curious question is whether two types of chiroptical amplifications, called sergeants-and-soldiers (Ser-Sol) and majority-rule (Maj) effects, between non-charged helical copolymers non-charged, non-helical homopolymers occur when copolymer encounter homopolymer in co-colloids. To address these topics, the present study chose (i) polysilane (HCPSs) carrying (S)- or (R)-2-methylbutyl with isobutyl groups as chiral/achiral co-pendants (type I) chiral/chiral II) (ii) blue luminescent...

10.3390/sym13040594 article EN Symmetry 2021-04-02

Abstract If N is a simply connected real nilpotent Lie group with Γ-rational complex structure, where Γ lattice in N, then for each s, t.We study relations between invariant structures and Hodge numbers of compact nilmanifolds from viewpoint algberas.

10.1515/coma-2016-0014 article EN cc-by Complex Manifolds 2016-11-09

Abstract Purpose We evaluated the setup accuracy of a three‐degree‐of‐freedom fiducial marker (3DOF‐FM)‐based compared to soft tissue (ST)‐based in hypofractionated intensity‐modulated radiotherapy (IMRT) for prostate cancer. Materials and Methods analyzed 17 consecutive cancer patients with three implanted FMs who underwent IMRT. The 3DOF‐ST‐based using cone‐beam computed tomography (CT) was performed after six DOF‐bony structure (BS)‐based an ExacTrac x‐ray system. 3DOF‐FM‐based matching...

10.1002/acm2.12603 article EN cc-by Journal of Applied Clinical Medical Physics 2019-05-04

10.1016/j.difgeo.2014.07.003 article EN publisher-specific-oa Differential Geometry and its Applications 2014-08-02
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