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In this paper, an optimal gate driving condition between switching loss and surge voltage is investigated by circuit simulation technique. An equivalent circuit model of power semiconductor devices, such as an IGBT and a FWD, are employed. Chip level transient switching waveforms of IGBT at different gate driving condition are calculated and evaluated with measurement results. Evaluation result shows...
DONET (Dense Oceanfloor Network system for Earthquakes and Tsunamis) has been developed and installed around Nankai Trough, which is motivated by the 2004 Sumatra-Andaman Earthquake. DONET contains pressure gauges as well as seismometers, which are expected to detect crustal deformations driven by peeling off subduction plate coupling process. From our simulation results, leveling changes are different...
. We study the three-dimensional joint distribution of a Brownian motion and the integrals of its exponential and its exponential squared from some points of view. We show an explicit expression of the Laplace transform of the distribution, which gives an extension of Yor’s resutlt on the two-dimensional one. We apply the result to some problems, in particular, to the calculation of an explicit form...
DONET (Dense Oceanfloor Network System for Earthquakes and Tsunamis) is a cabled observation system for long-term and real time monitoring using precision sensors on the seafloor. The development and the manufacturing of DONET2 system were commenced in 2013, and the construction was completed on schedule in 2016. In this paper, the DONET2 system and its installation technologies are introduced.
As part of the Next-Generation Technology for Ocean Resources Exploration project in the Cross-ministerial Strategic Innovation Promotion Program (SIP) of the Japanese government, Japan Agency for Marine-Earth Science and Technology (JAMSTEC) is promoting the development of the cabled seafloor observatory system which allows long-term monitoring of hydrothermal vents and ecological changes. Exploring...
We assessed a quartz pressure sensor characteristics assuming an ocean bottom and borehole environment in the laboratory. Accuracy evaluations of the hydraulic pressure sensors with a scale of 1 hPa are required for obtaining small pressure change related to crustal deformations on the seafloor. However, quantitative assessments to understand pressure sensor characteristics are not performed yet....
Offshore observations make it possible to detect tsunamis in advance prior to their arrivals at the shoreline. For this purpose, ocean bottom pressure gauges are widely used. However, in near- and intermediate fields, ocean bottom pressure records usually exhibit a complicated interference of signals related not only to gravitational wave (i.e., tsunami), but also to hydroacoustic and seismic waves...
DONET, i.e., the dense ocean-floor network system for earthquakes and tsunamis has started its operation in the Nankai Trough, SW Japan in the early of 2010. DONET in 20 observatories consists of various geophysical sensors such as broadband seismometer, seismic accelerometer, tsunami meter, and so on. The present study focuses on pressure sensors being used as tsunami meters measuring hydraulic pressure...
In seafloor seismic observation, the seismometer is usually installed on the seafloor. The data obtained from the seismometer installed on the seafloor is influenced by background noise. Therefore, in seafloor observation, it is necessary to install seismometer with consideration of influence depending on installation environment for observation with high accuracy. We investigated that whether the...
DONET (Dense Ocean-floor Observatory Network for Earthquakes and Tsunamis) is a submarine cabled real-time seafloor surveillance infrastructure for earthquake activity at assumed focus region of mega-thrust earthquake around Japan. The original system DONET1 was constructed in To-Nankai earthquake focus region and twenty seafloor observatories are working in operation beginning in 2011 to contribute...
The Nankai trough is one of the largest and hazardous seismogenic zones in the world. Around the Nankai Trough, there are 3 mega thrust earthquake seismogenic zones such as the Tokai, Tonankai and Nakai seismogenic zones. Especially, the estimation of seismic linkage between the Tonankai and Nankai seismogenic zone is very important and indispensable for the reduction of earthquake and tsunami damages...
We have developed immunopillar devices for rapid and easy-to-use immunoassay with pM-fM detection sensitivity, but long total assay time (sample-in-answer-out) and the compatibility with a portable detection system have still remained as major problems toward the point-of-care testing (POCT). We report here next generation immunopillar devices and portable detection system suitable for them. Thin...
This paper summarizes the trend of novel technologies used for electric vehicles (EV) and hybrid electric vehicles (HEV) based on the published papers and reports in order to predict the needs technologies for expanding EV and HEV market. At first, the relationship between energy demand situation and expanding trends of electric propulsion vehicles will be mentioned. Regarding traction motors, required...
This paper presents a front-end converter including a novel bridgeless PFC converter with high reliability and an isolated full-bridge DC-DC converter with a proposed control scheme to improve efficiency under a light load condition. The proposed bridgeless PFC converter can avoid flowing a high inrush current to silicon carbide Schottky diodes and MOSFETs without impairing efficiency. Furthermore,...
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