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Statistical analysis of automatically detected ion density variations recorded by DEMETER and their relation to seismic activity
Satellite Earthquake interactions and probability
2015/8/24
Many examples of ionospheric perturbations observed during large seismic events were recorded by the low-altitude satellite DEMETER. However, there are also ionospheric variations without seismic acti...
Learning to Automatically Solve Algebra Word Problems
Algebra Word Problems Automatically
2014/11/26
Learning to Automatically Solve Algebra Word Problems。
Automatically Smoothing the Spectroscopic Data by Cubic B-Spline Basis Functions
Spectroscopic data Automatic smoothing Spline function
2009/11/2
In the present paper, a new criterion is derived to obtain the optimum fitting curve while using Cubic B-spline basis functions to remove the statistical noise in the spectroscopic data. In this crite...
Measurements with an Automatically Recording Inverted Echo Sounder; ARIES and the Bubble Clouds
Automatically Recording Inverted Echo Sounder Bubble Clouds ARIES
2009/1/12
We report here analysis of the first observations with a new instrument, ARIES, designed to record the acoustic backscatter from bubble clouds at several levels below the surface of the ocean. The ins...
Valuable mineral resources are widely distributed throughout the seabed. autonomous underwater vehicles (AUVs) are preferable to remotely-operated vehicles (ROVs) when probing for such mineral resources as the extensive exploration area makes it difficult to maintain contact with operators. AUVs depend on batteries, so their power consumption should be reduced to extend exploration time. Power for conventional marine instrument systems is incorporated in their waterproof sealing. External intermittent control of this power source until termination of exploration is challenging due to limitations imposed by the underwater environment. Thus, the AUV must have a power control system that can improve performance and maximize use of battery capacity. The authors developed such a power control system with a three-step algorithm. It automatically detects underwater operational states and can limit power, effectively decreasing power consumption by about 15%.
surface piercing propeller boundary element method hydrodynamic characteristics
2011/9/13
Demand for high-speed marine vehicles (HSMVs) is high among both commercial and naval users. It is the duty of the marine vessel’s designer to provide a hull and propulsion system that diminishes drag...