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  • Articles  (322)
  • 2020-2024  (22)
  • 1970-1974  (295)
  • 1920-1924
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  • 1
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    Isolation of heterogeneous lymphocytes according to their cellular densities by multilayer centrifugation and detection of the separated fraction containing the immunological memory cells (1970)
    Elsevier
    Details
    Publication Date: 1970-02-01
    Print ISSN: 0014-4827
    Electronic ISSN: 1090-2422
    Topics: Biology , Medicine
    Published by Elsevier
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    PAPER CURRENT
  • 2
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    Experimental study on tsunami generated by three-dimensional landslides (2023)
    In:  XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
    Details
    Publication Date: 2023-05-15
    Description: Since tsunamis generated by submarine and subaerial landslides occur less frequently than tsunamis generated by fault movement, the actual behavior of landslide tsunamis is not well understood. Experimental and analytical studies have been conducted on submarine and subaerial landslide tsunamis, but there are fewer research examples than tsunamis generated by fault movement. In addition, experiments using two-dimensional flume have been mainly conducted, and there are few examples of examinations of submarine and subaerial landslide tsunamis under the same conditions. In this study, granular and solid slide models were used as models of landslide bodies, and hydraulic model experiments of submarine and subaerial landslide tsunamis were conducted by three-dimensional landslides. The 12.0m long, 12.0m wide, and 1.5m high experimental water tank was constructed, and landslide models were installed on the top of the slope. As the shape of the landslide model, three kinds of solid slide models were used as non-deformable landslide bodies, and granular bodies were used as deformable landslide bodies. We investigated the tsunami water level generated by the difference between granular material and solid slide model, and the difference between submarine and subaerial landslides, and its propagation process. The experimental data obtained in this study are useful for verification of the landslide tsunami numerical simulation model.
    Language: English
    Type: info:eu-repo/semantics/conferenceObject
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  • 3
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    The interannual variability of sea ice area, thickness, and volume in the southern Sea of Okhotsk and its likely factors (2023)
    In:  XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
    Details
    Publication Date: 2023-04-20
    Description: The lowest latitude sea ice in the world (excluding coastal freezing) is in the southern Sea of Okhotsk (south of 46°N), where it has significant impacts on freshwater input and primary production. This region is subject to climate change, and accordingly the monitoring of sea ice conditions is important. However, the interannual variability of the region’s sea ice is poorly understood due to its logistical challenges. Sea ice observations have been conducted in this region every winter for the period 1996-2020. The interannual variability of the ice conditions and the likely factors responsible for it were investigated using visual observations following the international ASPeCt protocol, combined with satellite SSM/I-SSMIS ice concentration data (1988-2020). AMSR-derived ice drift data sets and ERA5 meteorological reanalysis data sets were also analyzed to examine the effects of dynamic and thermodynamic processes. Our analysis revealed that 1) sea ice area in this region varies differently from that in the central and northern Sea of Okhotsk, where decreasing trends are reported, 2) sea ice volume has remarkable interannual variation and the peaks appeared much to more affected by dynamically deformed ice than freezing conditions, and 3) prominently deformed ice can be explained by taking shear components into account based on sea ice rheology. These results suggest the importance of including the proper sea ice rheology in numerical sea ice models to reproduce the realistic sea ice volume and deformation processes, and thereby the realistic primary production for all seasonal ice zones.
    Language: English
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  • 4
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    Experiments on saturated suspended sediment concentration in tsunami flow (2023)
    In:  XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
    Details
    Publication Date: 2023-05-05
    Description: The saturated suspended sediment concentration in tsunami flow was experimentally investigated in this study. The large-scale tsunami physical simulator of Central Research Institute of Electric Power Industry was used for the experiments. The flume was composed of 5m long flat and non-movable bed at the upstream side and 20m long initially flat movable bed with a sand layer at the downstream side. Fast inundation flows with the velocities of approximately 3 m/s and inundation depths of approximately 0.4m passed over the bed and entrained suspended sediment from the sand layer. As going to the downstream side, the suspended sediment concentrations increased and appeared to approach equilibrium/saturation states. The saturated suspended sediment concentration which were measured were compared with the classical theory of Bagnold (1966), and good agreement among them was confirmed.
    Language: English
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  • 5
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    Detection of hidden earthquakes after the 2011 Mw9.0 Tohoku earthquake and their relation to regional crustal deformation (2023)
    In:  XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
    Details
    Publication Date: 2023-09-12
    Description: Seismic activity increased throughout Japan after the 2011 Mw9.0 Tohoku earthquake. Microearthquakes (M〈2 inland and M〈3 offshore) were not adequately catalogued, making it difficult to comprehensively quantify changes in seismic activity after the 2011 Tohoku earthquake. Therefore, we developed an automatic source determination method using machine learning and detected "hidden" earthquakes that were more than twice as large as those in the conventional earthquake catalog from March 2011 to February 2012. This method includes phase discrimination using CNN and quality control using ensemble learning. We then merged the automatically determined catalog with the JMA unified earthquake catalog, and extracted inland seismic activity throughout Japan from the newly obtained merged catalog. We quantified the seismic activity based on the ETAS model from the obtained seismic catalog. The relative change in background seismic activity in April 2011 indicates that it is, on average, two to three times higher than before the Tohoku earthquake. We also found a positive correlation between the background seismic activity ratio and the maximum shear strain rate in the vicinity, based on the one-month difference in GNSS data. The obtained hidden earthquakes contribute to better resolution and quantification of seismic activity. Acknowledgements We used the waveforms from JMA, NIED, universities, and institutions, and the JMA unified earthquake catalog. We used GEONET (F5) coordinate data from GSI. We used Kasahara et al. (2016) to estimate ETAS parameters, and Shen et al. (1996, 2015) to calculate strain rates.
    Language: English
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  • 6
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    Numerical simulations of landslide-generated tsunamis using dispersive two-layer model (2023)
    In:  XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
    Details
    Publication Date: 2023-09-29
    Description: Fujii et al. conducted three-dimensional experiments to investigate the generation and propagation of tsunamis caused by landslides. They used granular materials or solid slide models as the landslides and switched between submarine and subaerial landslides by changing the initial water level. In this study, the two-layer model was validated using the results of their granular subaerial landslide experiments. Although calculated water levels using the original two-layer model based on the nonlinear shallow water equations significantly differed from the measurements, the addition of the dispersion term to the upper-layer equation resulted good agreement. The dispersive two-layer flow model can predict the water level of tsunamis caused by subaerial landslides comparable to the three-dimensional model, and is advantageous in terms of computational cost.
    Language: English
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  • 7
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    Three-dimensional numerical simulation of landslide-generated tsunamis (2023)
    In:  XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
    Details
    Publication Date: 2023-09-29
    Description: In this study, three-dimensional numerical simulations using OpenFOAM for tsunamis generated by submarine and subaerial landslides, were verified by comparison with the results of hydraulic model experiments conducted by Fujii et al. MultiphaseInterFoam was used for the solver and the landslide was modeled as a dilatant fluid. It was clarified that the grid size must be appropriately set to reproduce the short wave propagating to the shallow water area in the case of submarine landslide. The calculated thickness of the landslide at the start of the movement was consistent with that of the experiment, but the spread in the direction orthogonal to the slope was narrower than in the experiment. By examining the validity of the analysis for three-dimensional experiments rather than two-dimensional experiments, the issue of reproducibility of the flow shape and depositional area of the landslide body was clarified.
    Language: English
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  • 8
    Electronic Resource
    Electronic Resource
    Identity of the Pisum gibberellin (1970)
    s.l. : American Chemical Society
    Journal of agricultural and food chemistry 18 (1970), S. 182-182 
    Details
    ISSN: 1520-5118
    Source: ACS Legacy Archives
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jf60167a027
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  • 9
    Electronic Resource
    Electronic Resource
    Cleavage of amino acid esters and peptides with hydroxoaquo(2,2',2''-triaminotriethylamine)cobalt(III) ion (1970)
    s.l. : American Chemical Society
    Inorganic chemistry 9 (1970), S. 1183-1191 
    Details
    ISSN: 1520-510X
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ic50087a035
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  • 10
    Electronic Resource
    Electronic Resource
    Kinetics and mechanism of the reaction between formate and peroxodisulfate in aqueous solution (1974)
    s.l. : American Chemical Society
    Inorganic chemistry 13 (1974), S. 841-846 
    Details
    ISSN: 1520-510X
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ic50134a017
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