Knowing the species-specific target strength (TS) allows converting volume backscattering to numerical abundance. Since acoustic surveys conducted for biomass assessment in Mediterranean Sea currently focus on echoes of two or three pelagic species, TS non-target species has seldom been investigated this basin. This is first study – horse mackerel (Trachurus mediterraneus) and Atlantic chub (Sc...

The unpredictable noise in received signal strength indicator (RSSI) measurements indoor environments practically causes very high estimation errors target localization. Dealing with RSSI and ensuring target-localization accuracy RSSI-based localization systems is a popular research trend nowadays. This paper proposed two range-free schemes wireless sensor networks (WSN) for an setup: first pla...

Introduction: Understanding the impact process of ice-silicate mixtures is of importance, because water ices exist mostly in a variety of forms of mixtures with silicate or some other components (e.g. ammonia) in the solar system. Decrease of crater volume with increasing silicate content was observed in our previous impact cratering experiments of ice-silicate mixture targets performed using a...

Fisheries agencies around the Baltic Sea use hydroacoustics to assess stock sizes of herring and sprat. These assessments rely on the assumption that the acoustic properties of Baltic clupeids are the same as North Sea herring. This may lead to biased results, as system-specific differences in salinity and fish fat content may influence acoustic target strength. The acoustic properties of the B...