A5026660599- Radioactive element chemistry and processing
- Analytical chemistry methods development
- Lanthanide and Transition Metal Complexes
- Extraction and Separation Processes
- Radioactive contamination and transfer
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Intracranial Aneurysms: Treatment and Complications
- Traumatic Brain Injury and Neurovascular Disturbances
- Atmospheric and Environmental Gas Dynamics
- Ionic liquids properties and applications
- Geochemistry and Geologic Mapping
- Electrochemical Analysis and Applications
- Chemical and Physical Properties in Aqueous Solutions
- Heart Rate Variability and Autonomic Control
- Catalytic Processes in Materials Science
- Laser-induced spectroscopy and plasma
- Nuclear Materials and Properties
- Metal complexes synthesis and properties
- Catalysis and Hydrodesulfurization Studies
- Geochemistry and Elemental Analysis
- Cerebrospinal fluid and hydrocephalus
- Spinal Fractures and Fixation Techniques
- Intracerebral and Subarachnoid Hemorrhage Research
- Complex Systems and Time Series Analysis
Japan Atomic Energy Agency
2012-2024
Advanced Science Research Center
2015-2024
The University of Tokyo
2003-2018
Fukuoka University
2017
KU Leuven
2011-2015
Ohara Memorial Institute for Science of Labour
2007
Japan Graduate School of Education University
2005
Tokyo Metropolitan Komagome Hospital
1996
Tokyo Metropolitan Bokutoh Hospital
1989
Unacceptably high uranium concentrations in decentralized and remote potable groundwater resources, especially those of hardness (e.g ., Ca2+, Mg2+, CO32- concentrations), are a common worldwide problem. The complexation alkali earth metals, carbonate, uranium(VI) results the formation thermodynamically stable ternary aqueous species that predominantly neutrally charged Ca2(UO2)(CO3)30). removal uncharged (nonadsorbing) complexes is problematic issue for many water treatment technologies. As...
Liquid-liquid extraction of lanthanide ions (Ln(3+)) using N,N-dioctyldiglycolamic acid (DODGAA) was comprehensively investigated, together with fluorescence spectroscopic characterization the resulting extracted complexes in organic phase. DODGAA enables quantitative partitioning all Ln(3+) from moderately acidic solutions, while showing selectivity for heavier lanthanides, and provides remarkably high separation performance compared typical carboxylic extractants. Furthermore, mutual...
Temperature-dependent yellow-to-red colour changes of uranyl thiocyanate complexes with 1-alkyl-3-methylimidazolium cations have been studied by different spectroscopic methods and this phenomenon is attributed to in the local environment ion, including coordination number, as well cation-anion interactions.
The uptake and binding of uranium [as (UO2)2+] by a moderately acidophilic fungus, Coniochaeta fodinicola, recently isolated from mine site, is examined in this work order to better understand the potential impact organisms such as on sequestration hydrometallurgical systems. Our results show that viability fungal biomass critical their capacity remove solution. Indeed, live (viable cells based vital staining) were capable removing ∼16 mg U/g dry weight contrast with dead (autoclaved) which...
For a detailed characterization of intermittency and non-Gaussianity human heart rate, we introduce an analysis method to investigate the deformation process probability density function (PDF) detrended increments when going from fine coarse scales. To characterize scale dependence multiscale PDF, use two methods: 1) calculation Kullback-Leibler relative entropy; 2) parameter estimation based on Castaing's equation (B. Castaing et al, 1990). We compare scale-dependence increment PDFs between...
Time-resolved laser fluorescence spectroscopy (TRLFS) is an analytical technique capable of discriminating different chemical species a fluorescent metal ion such as UO22+, Cm3+, and lanthanides. Although TRLFS has been widely used to investigate the speciation ions, extracting quantitative structural information from multiple data measured function physical parameters not simple task. The purpose this study apply parallel factor analysis (PARAFAC) for interpretation series data. PARAFAC...
An intramolecular cooperative extraction system for the removal of strontium cations (Sr(2+)) from water by use a novel macrocyclic receptor (H(2)βDA18C6) composed diaza-18-crown-6 and two β-diketone fragments in ionic liquid (IL) is reported, together with X-ray spectroscopic characterization resulting extracted complexes IL chloroform phases. The covalent attachment to diazacrown ether resulted interaction within Sr(2+) transfer, which remarkably enhanced efficiency transfer relative mixed...
The replacement of water molecules [Eu(tta)<sub>3</sub>(H<sub>2</sub>O)<sub>3</sub>] with Tf<sub>2</sub>N<sup>−</sup> was evidenced in water-saturated [C<sub>n</sub>mim][Tf<sub>2</sub>N] by time-resolved laser-induced fluorescence spectroscopy.
The influence of pH and concentrations Eu3+ NaNO3 on the sorption to Na-montmorillonite were investigated through batch measurements time-resolved laser fluorescence spectroscopy. had little effect distribution coefficients (Kd) in range 4–7 at 0.01 M NaNO3, which indicates that cation exchange reaction is a dominant process. Meanwhile, Kd strongly depended 1 suggesting formation inner-sphere surface complexes. A model combined with one-site non-electrostatic complexation was successfully...
The investigation of the relation between long-range correlation property heart rate and autonomic balance.An fractal scaling properties variability was carried out by using detrended fluctuation analysis (DFA). Eleven healthy subjects were examined for two consecutive days, which included usual daily activity, strenuous prolonged experimental exercise, sleep. We also considered patient groups with dysfunction characterized selective sympathetic parasympathetic dominance.Robust dependence in...
Widely present in Japan's deep subterranean formations, pre-Neogene sedimentary rocks offer an option for high-level radioactive waste (HLW) geological disposal due to their favorable properties. However, barrier properties necessitate further investigation. This research examines the characteristics of rocks, focusing on two rock types: melange type with a distinct block-in-matrix structure and sandstone-dominant coherent type. Their ability mechanism sorb Cs+ Eu3+ are assessed, differences...