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  • 1
    Electronic Resource
    Electronic Resource
    Balloon-borne experiment with a superconducting solenoidal magnet spectrometer
    Amsterdam : Elsevier
    Advances in Space Research 14 (1994), S. 75-87 
    Details
    ISSN: 0273-1177
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0273-1177(94)90071-X
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  • 2
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    Balloon-borne experiment with a superconducting solenoidal magnet spectrometer (1994)
    Elsevier
    Details
    Publication Date: 1994-02-01
    Print ISSN: 0273-1177
    Electronic ISSN: 1879-1948
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Elsevier
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  • 3
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    Hydraulic Experiments on Sediment Trapping Capacity by Types of Coastal Vegetation in Chiba Pref (2023)
    In:  XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
    Details
    Publication Date: 2023-08-09
    Description: Coastal forests have disaster-prevention effects such as reducing the force of tsunami waves and trapping drifting debris. On the other hand, sediment runoff from the coastal forest floor can cause the forest to driftwood, increasing the damage. The forest floor environment is composed of a wide variety of coastal vegetation. Although these vegetations have the effect of preventing blowing sand, their sediment trapping effect against tsunamis is unknown. The objective of this study is to elucidate the sediment trapping effect of coastal vegetation through hydraulic experiments. The samples were collected from coastal vegetation from the front edge of coastal forests in Chiba Prefecture, Japan. The vegetation samples were placed in a sand box in a two-dimensional water channel, and waves were generated to measure the amount of sediment transported from the sand box. The generated waves were a bore wave simulating the tip of a tsunami and a steady flow simulating the passage of a tsunami. The water level and velocity in the channel were measured in a fixed-bed experiment. The flow conditions were checked during the experiment by video recording from above and from the side of the sand-bed box. The results showed that sediment transport decreased with increasing vegetation coverage. In the case of multiple bore wave events, it was suggested that the type of vegetation and the amount of rhizomes may also affect the amount of sediment transport.
    Language: English
    Type: info:eu-repo/semantics/conferenceObject
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  • 4
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    Glacial carbon cycle changes by Southern Ocean processes with sedimentary amplification (2023)
    In:  XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
    Details
    Publication Date: 2023-06-08
    Description: Recent paleo reconstructions suggest that increased carbon storage in the Southern Ocean during glacial periods contributed to low glacial atmospheric carbon dioxide concentration (pCO2). However, quantifying its contribution in three-dimensional ocean general circulation models (OGCMs) has proven challenging. Here, we show that OGCM simulation with sedimentary process considering enhanced Southern Ocean salinity stratification and iron fertilization from glaciogenic dust during glacial periods improves model-data agreement of glacial deep water with isotopically light carbon, low oxygen, and old radiocarbon ages. The glacial simulation shows a 77-ppm reduction of atmospheric pCO2, which closely matches the paleo record. The Southern Ocean salinity stratification and the iron fertilization from glaciogenic dust amplified the carbonate sedimentary feedback, which caused most of the increased carbon storage in the deep ocean and played an important role in pCO2 reduction. The model-data agreement of Southern Ocean properties is crucial for simulating glacial changes in the ocean carbon cycle.
    Language: English
    Type: info:eu-repo/semantics/conferenceObject
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  • 5
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    Simulation of drifting aquaculture facilities in Yamada Bay during the 2022 Tonga volcano eruption and tsunami (2023)
    In:  XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
    Details
    Publication Date: 2023-09-06
    Description: A tsunami triggered by the eruption of an undersea volcano off the coast of Tonga in January 2022 caused damage to aquaculture facilities along the Japanese coast. Since damage to aquaculture facilities by non-seismic tsunamis, which have a shorter period than seismic tsunamis, is unprecedented, it is important to elucidate the damage mechanism. In this study, drifting simulations of aquaculture facilities in Yamada Bay were conducted to clarify the damage process of aquaculture facilities caused by this event. The tsunami propagation was based on the nonlinear shallow water equations, and the water level waveforms observed by GPS wave gauges were input from the boundary. The drift of the aquaculture facility was represented by a rigid body model, and the hydrodynamic forces caused by the tsunami were applied to the model. The location of the aquaculture facilities was obtained from Google Earth satellite images of Yamada Bay, and the weight and size of the aquaculture products were given as parameters based on information obtained from field surveys conducted by the authors. Numerical results indicated that the water level tended to rise at the back of the bay and the flow velocity tended to increase at the mouth of the bay and on topographic features such as capes. There was a positive correlation between the flow velocity and the drift distance of aquaculture facilities, which was especially significant in the affected areas. Even small tsunamis may have a significant impact on the location of aquaculture facilities in the bay.
    Language: English
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  • 6
    Electronic Resource
    Electronic Resource
    A note on the superspace groups for one-dimensionally modulated structures (1985)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 41 (1985), S. 528-530 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: A computer generation of all the non-equivalent superspace groups for one-dimensionally modulated structures has been performed. Comparison of this result with the previous list by de Wolff, Janssen & Janner [Acta Cryst. (1981), A37, 625-636] shows that three superspace groups in this list are equivalent to others and that six groups had been overlooked. The new list contains 775 (3 + 1)-dimensional superspace groups. Some ambiguous points in the notation of the superspace groups and the selection of the wave vector are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108767385001167
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Penrose patterns and related structures. I. Superstructure and generalized Penrose patterns (1988)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 44 (1988), S. 508-516 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The section method is applied to derive the Penrose pattern and related patterns with a ten- or fivefold axis. These are derived from a four-dimensional decagonal crystal or from a five-dimensional icosahedral crystal as a two-dimensional section. The two descriptions correspond to the three- and four-dimensional ones in the usual superstructure and the Penrose pattern can be regarded as the superstructure in the four-dimensional space. The diffraction intensities and symmetries of these patterns are discussed. The present study indicates that the point group in the quasicrystals is noncrystallographic but (m + d)-reducible similarly to that in incommensurate structures, where m and d are the dimension of the real space and the orthogonal complement to it.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108767388002958
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  • 8
    Electronic Resource
    Electronic Resource
    Structure factor of modulated crystal structures (1982)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 38 (1982), S. 87-92 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: A general structure-factor formula for n-dimensionally modulated structures (n = 1, 2, ...) has been derived to have both density (or substitutional) and displacive modulations. This structure-factor formula covers any modulated structure described by a (3 + n)-dimensional space group. Future papers show the applications of this formula to one- and three-dimensional modulations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739482000163
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  • 9
    Electronic Resource
    Electronic Resource
    Modulated structure of the NC-type (N = 5.5) pyrrhotite, Fe1−xS (1982)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 38 (1982), S. 79-86 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The modulated structure of the NC-type pyrrhotite Fe1 - xS with x = 0.09 has been determined. The analysis is based on a four-dimensional space group, Wpna21qq1, and an anharmonic modulation model with 53 positional, two thermal, and eight occupational parameters including up to fourth-order harmonics, a = 11.952, b = 6.892, c = 5.744 Å. The final R for 404 observed reflections is 0.097. The modulation wave for occupation probability of Fe shows a strong anharmonicity and has a low value in a narrow range corresponding to successive Fe layers perpendicular to the c axis of the fundamental NiAs-type structure. From this and the four-dimensional symmetry, it is concluded that Fe vacancies are distributed spirally along the c axis. The relationship between the usual superstructure model and this four-dimensional description is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739482000151
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  • 10
    Electronic Resource
    Electronic Resource
    Penrose patterns and related structures. II. Decagonal quasicrystals (1988)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 44 (1988), S. 707-714 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Structural relations of the two decagonal phases in Al-Mn and Al-Fe alloys with the Penrose pattern are discussed based on structure-factor calculations and symmetry considerations. The electron diffraction patterns are explained by models with layer structures which consist of the stacking of four kinds of layers constructing the Penrose pattern. Al-Mn has six layers within a period along the tenfold axis while Al-Fe includes eight. A projection along the axis shows the Penrose pattern in both models. The symmetries of Al-Mn and Al-Fe are expressed by the five-dimensional superspace groups P105/mmc and P105mc. These give the observed systematic extinction rules. In Al-Fe, an additional extinction rule due to the symmetry element of the superspace groupoid exists.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S010876738800296X
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