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Submicron particles play an important role in marine and freshwater ecology and, hence, a measurement system to accurately size them is highly desirable. This paper will propose such a method based on the oblique illumination and high numerical aperture lenses. A setup is suggested to measure the forward and backward scattering patterns. And then a ratio is calculated using these patterns. Simulations...
This paper presents a method to localize underwater gliders in observation networks, and this method is also applicable to other vehicles. Utilizing the travel time of acoustic signals from near-surface acoustic sources, the dead-reckoning positions of underwater gliders can be refined. Specifically, compare two kinds of travel time, one is simulated by an acoustic model for a series of possible positions...
Dredging work in marine construction causes some damage to fisheries industry and ecosystem due to turbidity. In the worst case, turbidity may cause suspension of construction work, and it affects the construction schedule. This study examines the development of filtration methodology to remove suspended solid by using a spring filter, which has been developed so far. Experiments and simulation was...
Methane hydrates are considered as new natural gas resources. For long time commercial gas production, it is needed to increase gas production efficiency. In this study, we carried out hydrate dissociation experiments by depressurization with wellbore heating method for artificial sandy cores. Contribution of wellbore heating was small for hydrate dissociation. This is coursed that the production...
The requirement of oil has increased the potential hazard of the accidents of the marine oil more evident, which urgently needs human to pay attention to monitoring oil production in order to reduce the economic loss and environmental damage. Although many efforts has been made to develop devices or instruments for marine oil spill monitoring, the droplet processing in micro environment is still not...
Offshore oil and gas industry has been active in the North Sea for more than half a century, contributing to the economy and facilitating a low oil import rate in the producing countries. The peak production was reached in the early 2000s, and since then the oil production has been decreasing while the water cut has been increasing rapidly. The water dominates some of the wells and a water cut of...
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