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In this paper, the effective utilization and application of a GIS, known as digital basic maps of the seas in coastal waters (BMSCW), of Japan is shown.
The estimation of oceanic crust structure is required to reveal the development history of Japanese island arcs and to estimate the limit of legal continental shelf. Refraction or reflection wave exploration is one of the methods for deep oceanic crust investigation, but these methods use only compressional wave or the depth component of a seismometer. Hence, it is needed to use shear wave or horizontal...
To understand how the dissolution rate of calcium carbonate changes, laboratory experiments were conducted under high pressure and high pCO2 condition. As a result, rapid dissolution was observed at above 5000 ppm of pCO2. The initial dissolution rates of the well correlated with initial concentration of dissolved inorganic carbon. Dissolution rate were generally decreased with time. Dissolution of...
The ocean sequestration of carbon dioxide (CO2), direct injection of CO2 into bathypelagic layers, is one of the climate change mitigation options. It is essential to assess the potential environmental impacts on the marine ecosystem. In bathypelagic layers, bacteria are dominant organisms and play significant roles in oceanic carbon cycling through utilization and transformation of organic matter...
We present some of the latest developments in marine instrumentation for geophysical instrumentation, and their evolutions. For several years, we have been developing magnetotelluric seafloor instruments. Initially for deep mantle studies, recording at low frequency with long term instruments, more recently for crustal studies and industrial exploration with high frequency recording. We are also currently...
Halomonas ventosae DL7 is a moderately halophilic bacterium that can grow over a wide range of salinity, 1-23 % NaCl. In response to the external osmotic stress (1-3 M NaCl), strain DL7 can accumulate ectoine and hydroxyectoine as compatible solutes, both of which were identified by nuclear magnetic resonance (NMR) spectroscopy. Hydroxyectoine, derivative of ectoine, was synthesized as minor compound...
In this work, as a novel process for use of renewable energy, the authors would like to discuss the possibility of an artificial muscle actuator based on a dielectric electroactive polymer (elastomer). This highly efficient actuator can transform electric energy into mechanical energy (theoretical transformation efficiency of 80 to 90%) with a high energy density of 1.0 W/g. Using the reverse operation...
In this article, we performed numerical simulations to investigate dissolution and dilution processes of releasing CO2 in the ocean with the advanced CO2 dilution technology, in which enhancement of horizontal dilution of released CO2 can be expected by using arrayed cylinders behind the CO2 releasing pipe. Numerical analysis in which turbulent properties based on our experimental investigations were...
The classical Stokes' problems are of great importance in many theoretical studies and practical applications. There are two kinds of Stokes' problems [1] referred to the flow induced by a moving plate with constant speed and the oscillating plate, respectively. For geophysicists interested in the flow induced by earthquakes, fracture of ice sheets and other related problems, the extension of the...
For ROV operations in underwater engineering, it is very important to obtain the depth information among objects. This paper presents a 3D image information display system based on a new technique of laser frequency-difference scanning principle. The depth differences of object surfaces are interpreted as the differences of sensing time of the scanning laser beam and so can be observed on screen in...
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