David Sarriá

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Radio frequency identification (RFID) devices are currently used to quantify several traits of animal behaviour with potential applications for the study of marine organisms. To date, behavioural studies with marine organisms are rare because of the technical difficulty of propagating radio waves within the saltwater medium. We present a novel RFID tracking(More)
Artificial reef areas can be used for management and conservation of commercially exploited crustacean decapods but their behaviour in these environments is poorly characterised. Acoustic tags were used to study the behaviour of 3 adult spiny lobsters (Palinurus mauritanicus) and 3 adult spider crabs (Maja squinado) over a period of 64 days in summer,(More)
The Norway lobster, Nephrops norvegicus (L.), is a deep-water burrowing decapod of high commercial value. Diel variations in trawl captures are produced by population rhythms of burrow emergences related to day-night cycles. Rhythms seem to be different in males and females since catches show variations in sex ratios depending on the season. Our hypothesis(More)
This work presents a first approach to wireless underwater sensor networks UWSN time synchronization, using OFDM (Orthogonal Frequency Division Multiplexing) acoustic communication and time reference served by a synchronization protocol. This synchronization and type of modulation allows getting a low drift clock on each sensor, on a high efficiency(More)
Currently, there is a lag in the proliferation of underwater sensors due to the lack of low cost acoustic transmitters. The high cost of acoustic modems and some of their characteristics, make them inappropriate for many scenarios where low power and short range communications are required. This paper presents the design and the details of a low-cost(More)
The emerging field of high energy atmospheric physics (HEAP) includes terrestrial gamma-ray flashes, electron–positron beams and gamma-ray glows from thunderstorms. Similar emissions of high energy particles occur in pulsed high voltage discharges. Understanding these phenomena requires appropriate models for the interaction of electrons, positrons and(More)
 A tracking system with RFID technology has been developed to measure the activity and behaviour of species in laboratory. It consists of different controllers which handle different RFID antennas. The controllers send the data received from its antennas to a host computer that computes the tracking of the different individuals. The system has a tracking(More)
An automated system has been developed to measure the activity and behaviour of species. The system developed has a distributed topology with custom low cost acquisition and illumination devices and infrared cameras. These different systems use the USB interface and permit to acquire from photodiodes sensors to illuminate with a programmable photoperiod and(More)
Most of the actual fire alarm systems used in small and medium size places in the market works as a standalone systems without the possibility of remote monitoring or configuration. This article shows a new development that provided for one hand, an Alarms and Events Reception System (AERS) that provide remote monitoring of fire alarm systems status based(More)