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There is a growing interest in the use of untethered underwater vehicles. These vehicles require robust and error-free underwater communication for transmission of mission-critical data. In contrast, the requirements for sensor payloads are often less stringent. Depending on the type of data, different Quality-of-Service (QoS) demands can be identified. To maximize the bandwidth utilization of underwater...
This paper reports results from the joint European project ldquoUUV covert acoustic communicationsrdquo (UCAC), which aims at the establishment of a covert communication link between an unmanned underwater vehicle (UUV) and a distant mother platform using acoustic telemetry. To this end, sea trials were carried out in 2006 and 2007 in two different areas in the Baltic and Norwegian North Sea. During...
A computational study of turbulent natural convection in a side-heated near-cubic enclosure at a high Rayleigh number (Ra=4.9x10 10 ) is performed, aimed at gaining a better insight into the flow pattern, particularly in the corner regions. Two types of thermal boundary conditions are applied at the horizontal walls: adiabatic and isothermal. Also, two kinds of lateral vertical walls...
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