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Preface: Front edge of submarine mineral resources research in Japan (Part 2)
Japan ubmarine mineral resources
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2017/4/10
As we mentioned in the preface of the last special issue
(Suzuki et al., 2015), greater interests in submarine resources
have been generated recently because many people
have realized their high po...
RESEARCH ON MINERAL RESOURCES PLANNING AND MANAGEMENT INFORMATION SYSTEM BASED-ON GIS TECHNOLOGY
Mineral Resources Planning and Management GIS Function Design Database Design Secondary Development
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2016/3/17
Mineral resources are important non-renewable resource, its reserves are limited. However, with the social development and population growth, the depletion of mineral resources is increasing rapidly, ...
Lithuanian mineral resources and their usage:today,future,and problems
mineral resources today future problems
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2009/10/21
Mineral resources have been, are now, and will be one of the main factors of the economic and social progress of our societies. The 20th century was the century of practically global industrialization...
Some problems of sustainable management of mineral resources in Poland
mineral resources Poland environmental-spatial planning sustainable mining
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2009/10/21
Management under the framework of sustainable development requires a change in the attitude to ongoing activities, as well as a new value hierarchy in which, instead of direct profit, improvement of t...
Developing the Mineral Resources of the Seabed
Mineral Resources Seabed economic well-being
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2008/12/17
The world’s oceans have played a vital role in the development of
virtually every nation. They provide the transportation network that
binds us together through trade; they yield much of the food th...
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
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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...