Underwater acoustic (UWA) communication is useful in a variety of industrial and scientific applications such as ocean observation and exploration, subsea telemetry, marine security and defense, etc. The UWA channel poses a challenge for high-frequency communication systems due to its severe multipath delay spread and rapid time fluctuations. The substantial inter-symbol interference (ISI) prod...

Ubiquitous and IoT (Internet of Things) systems consist of many parts, are highly distributed and need to be adaptive in a highly dynamic environment. The exploitation of adaptation possibilities at different layers needs to be coordinated to get an optimal result. However, it is difficult to test and evaluate such distributed systems with regard to their adaptive behaviour. This paper presents...

The response of permafrost to marine submergence can vary between ice-rich late Pleistocene deposits and the thermokarst basins that thawed out during Holocene. We hypothesize inundated Alases offshore thaw faster than submerged Yedoma. To test this hypothesis, we estimated depths top ice-bearing Bykovsky Peninsula in northeastern Siberia using electrical resistivity surveys. surveys traversed ...

The observation and detection of the subsea environment urgently require large-scale long-term platforms. design development AUVs involve three key points: subsea-adapted main body structure, agile motion performance that adapts to complex underwater environments, acoustic communication positioning technology. This paper discusses evolution before proposing solutions navigation schemes. It also...

Industrial subsea infrastructure inspections using autonomous underwater vehicles (AUV) require high accuracy of AUV navigation relative to the objects being examined. In addition traditional tools with inertial systems and acoustic equipment, technologies video information processing are also actively developed today. The visual odometry-based techniques can provide higher for local maneuverin...

The geotechnical design of partially mobile subsea foundations (mudmats) for pipeline/flowline end terminals (PLETs) is presented in this paper. A mudmat represents a fit-for-purpose engineering solution that has significant commercial competitiveness. lies between fully anchored (which designed negligible movements but may be too large, causing installation issues or requiring corner piles to ...

In recent times, the utilisation of marine composites in tubular structures has grown popularity. These applications include composite risers and related SURF (subsea umbilicals, flowlines) units. The industry evolved development advanced composites, such as thermoplastic pipes (TCP) hybrid structures. However, there are gaps understanding its performance risers, hence need for this review on d...