Development of an acoustic transceiver for the KM3NeT positioning system

[EN] In this paper we describe an acoustic transceiver developed for the KM3NeT positioning system. The acoustic transceiver is composed of a commercial free flooded transducer, which works mainly in the 20-40 kHz frequency range and withstands high pressures (up to 500 bars). A sound emission board was developed that is adapted to the characteristics of the transducer and meets all requirements: low power consumption, high intensity of emission, low intrinsic noise, arbitrary signals for emission and the capacity of acquiring the receiving signals with very good timing precision. The results of the different tests made with the transceiver in the laboratory and shallow sea water are described, as well as, the activities for its integration in the Instrumentation Line of the ANTARES neutrino telescope and in a NEMO tower for the in situ tests. © 2012 Elsevier B.V. All rights reserved.This work has been supported by the Ministerio de Ciencia e Innovacion (Spanish Government), Project references FPA2009-13983-C02-02, ACI2009-1067, AIC10-D-00583, and Consolider-Ingenio Multidark (CSD2009-00064). It has also been funded by Generalitat Valenciana, Prometeo/2009/26, and the European 7th Framework Programme, Grant no. 212525.Larosa, G.; Ardid Ramírez, M.; Llorens Alvarez, CD.; Bou Cabo, M.; Martínez Mora, JA.; Adrián Martínez, S.; KM3NeT Consortium (2013). Development of an acoustic transceiver for the KM3NeT positioning system. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 725:215-218. https://doi.org/10.1016/j.nima.2012.11.167S21521872

The Sound Emission Board of the KM3NeT Acoustic Positioning System

We describe the sound emission board proposed for installation in the acoustic positioning system of the future KM3NeT underwater neutrino telescope. The KM3NeT European consortium aims to build a multi-cubic kilometre underwater neutrino telescope in the deep Mediterranean Sea. In this kind of telescope the mechanical structures holding the optical sensors, which detect the Cherenkov radiation produced by muons emanating from neutrino interactions, are not completely rigid and can move up to dozens of meters in undersea currents. Knowledge of the position of the optical sensors to an accuracy of about 10 cm is needed for adequate muon track reconstruction. A positioning system based on the acoustic triangulation of sound transit time differences between fixed seabed emitters and receiving hydrophones attached to the kilometre-scale vertical flexible structures carrying the optical sensors is being developed. In this paper, we describe the sound emission board developed in the framework of KM3NeT project, which is totally adapted to the chosen FFR SX30 ultrasonic transducer and fulfils the requirements imposed by the collaboration in terms of cost, high reliability, low power consumption, high acoustic emission power for short signals, low intrinsic noise and capacity to use arbitrary signals in emission mode.Comment: 9 pages, 4 figure

IMPORTANCE OF DIETARY TAURINE AND SELENIUM ON GROWTH AND SURVIVAL OF ATLANTIC BLUEFIN TUNA Thunnus thynnus LARVAE

One of the most important bottleneck in the farming of Atlantic bluefin tuna (ABT) is the growth and survival during the larval rearing phase, mainly related with the diet quality. For the last ten years the Spanish Institute of Oceanography (IEO) in Mazarrón (Murcia, SE Spain) has developed a technique for ABT larval rearing and juvenile production. Taurine and selenium are essential water soluble compounds in live preys and inert diets for ABT larvae and juveniles. To know the importance of dietary taurine and selenium on growth and survival of ABT larvae, two experiments have been carried out with different taurine (Exp1) and selenium (Selplex® ) (Exp2) doses added to rotifers enriched with ALGAMAC 3050® . Both experiments were finished at 14 days post hatching. ABT fertilized eggs were collected from captive breeders spawning spontaneously in floating cages in the area. The eggs, transported to the IEO facilities, were quantified, cleaned, selected by buoyancy and distributed randomly in 1400 L fiber cylindrical glass tanks at a density of 10 ABT eggs per liter, whereas prey density was maintained at 5 rotifers per mL. Temperature ranges were: 24.0±0.5ºC and 26.0±0.5ºC for Exp1 and Exp2, respectively. Fig 1 shows the growth results in size for both experiments at 14 dph. Survival in both cases was close to 10% with no significant differences due to the different treatments. The lowest growth in size was observed in larvae fed dose 0 in both experiments Standard length average (mm ± confidence intervals) in Exp1 and Exp2 at 14 dph. Letters indicate statistically significant differences (95%

Ultrasonic transmitter for positioning of the large underwater neutrino telescope KM3NeT

This article belongs to a special issue: 43rd Annual UIA Symposium 23—25 April 2014 CSIC Madrid, Spain. Edited By Margaret Lucas and Enrique Riera[EN] Underwater ultrasonic transducers are commonly used for marine applications including communication and positioning systems. In this work, an ultrasonic transmitter transducer developed for the very large underwater neutrino telescope KM3NeT positioning is presented. The telescope infrastructure will have some degree of motion due to sea current; hence a positioning system is needed in order to monitor the position of the optical sensors. For this purpose, a reliable and affordable positioning based on acoustic systems is used. The ultrasound transmitter prototype developed as part of the positioning system is composed of a commercial FFR transducer and specifically designed electronics to optimize the system and fulfil the requirements of the KM3NeT infrastructure. The transmitter is able to generate high-power short signals with arbitrary waveform in a range of 20 kHz - 40 kHz and withstand high pressures. Signal processing techniques such as advanced cross-correlation methods and filtering as well as broad-band ultrasound signals are also applied for optimizing the acoustic emission and position detection. The work done for a precise laboratory testing and optimization of the system is described. The prototype has been integrated in the ANTARES neutrino telescope for testing its accuracy and the reach in situ. The test results obtained are also presented in this communication.This work has been supported by the Ministerio de Economía y Competitividad (Spanish Government), project ref. FPA2012-37528-C02-02, Multidark (CSD2009-00064) and the European 7th Framework Programme, Grant no. 212525.Saldaña Coscollar, M.; Adrián Martínez, S.; Bou Cabo, M.; Felis Enguix, I.; Larosa, G.; Llorens Alvarez, CD.; Martínez Mora, JA.... (2015). Ultrasonic transmitter for positioning of the large underwater neutrino telescope KM3NeT. Physics Procedia. 63:195-200. https://doi.org/10.1016/j.phpro.2015.03.032S1952006

Estimation of phosphorous and nitrogen waste in rainbow trout (Oncorhynchus mykiss, Walbaum, 1792) diets including different inorganic phosphorous sources

[EN] Aquaculture effluents with high levels of phosphorus (P) and nitrogen (N) contribute to eutrophication in the aquatic ecosystem. The environmental impact of phosphorus and N aquaculture waste may be diminished by modifying diet ingredients that improve phosphorous (P) digestibility, and therefore, reduce the P in metabolic waste. The content of P in fishmeal is high (30 g/kg), but the inclusion of fishmeal in the diet is reducing due to its high costs and limited accessibility; therefore, the addition of an inorganic P source is necessary to ensure a satisfactory level of available P in fish diets. Consequently, the present study aimed to evaluate the effect of four different inorganic P sources on P digestibility and excretion in rainbow trout (Oncorhynchus mykiss), as one of the most relevant aquaculture species. Monosodium/monocalcium phosphate with 2% of sodium source presented a P digestibility similar to monoammonium phosphate, but with lower nitrogen and phosphorus excretion into the environment, which is advantageous from a nutritional, environmental and industrial point of view (biofilters and recirculation systems in fish farms). This study was conducted to evaluate the apparent availability and P and N excretion in rainbow trout (Oncorhynchus mykiss) using different inorganic phosphorus sources. With this goal, fish (153 +/- 14.1 g) fed four inorganic P sources were assayed: monoammonium phosphate (MAP, NH4H2PO4), monosodium/monocalcium phosphate (SCP-2%, AQphos+, NaH2PO4/Ca(H2PO4)(2)center dot H2O in proportion 12/88), monosodium/monocalcium phosphate (SCP-5%, NaH2PO4/Ca(H2PO4)(2)center dot H2O in proportion 30/70) and monocalcium phosphate (MCP, Ca(H2PO4)(2)center dot H2O). Phosphorus (P) digestibility, in diets that included MAP and SCP-2% as inorganic phosphorus sources, were significantly higher than for SCP-5% and MCP sources. In relation to the P excretion pattern, independent of the diet, a peak at 6 h after feeding was registered, but at different levels depending on inorganic P sources. Fish fed an MAP diet excreted a higher amount of dissolved P in comparison with the rest of the inorganic P sources, although the total P losses were lower in MAP and SCP-2% (33.02% and 28.13, respectively) than in SCP-5% and MCP sources (43.35% and 47.83, respectively). Nitrogen (N) excretion was also studied, and the fish fed an SCP-5% diet provided lower values (15.8%) than MAP (28.0%). When N total wastes were calculated, SCP-2% and SCP-5% showed the lowest values (31.54 and 28.25%, respectively). In conclusion, based on P and N digestibility and excretion, the SCP-2% diet showed the best results from a nutritional and environmental point of view.This study has been developed under the framework of the project entitled "Improvement of the nutritional quality of aquaculture feeds through the incorporation of microalgae hydrolysates enriched in probiotic microorganisms-ALQUABIOTIC," ITC-20181099, corresponding to the FEDER INNTERCONECTA 2018 call, funded by CDTI (Centre for the Development of Industrial Technology), supported by the Ministry of Science, Innovation and Universities and co-financed by FEDER funds (European Regional Development Fund) within the 2014-2020 Intelligent Growth Operational Program.Milián-Sorribes, MC.; Tomas-Vidal, A.; Peñaranda, D.; Carpintero, L.; Mesa, JS.; Dupuy, J.; Donadeu, A.... (2021). Estimation of phosphorous and nitrogen waste in rainbow trout (Oncorhynchus mykiss, Walbaum, 1792) diets including different inorganic phosphorous sources. Animals. 11(6):1-14. https://doi.org/10.3390/ani11061700S11411

A compact acoustic calibrator for ultra-high energy neutrino detection

With the aim to optimize and test the method of acoustic detection of ultra-high energy neutrinos in underwater telescopes a compact acoustic transmitter array has been developed. The acoustic parametric effect is used to reproduce the acoustic signature of an ultra-high-energy neutrino interaction. Different R&D studies are presented in order to show the viability of the parametric sources technique to deal with the difficulties of the acoustic signal generation: a very directive transient bipolar signal with 'pancake' directivity. The design, construction and characterization of the prototype are described, including simulation of the propagation of an experimental signal, measured in a pool, over a distance of 1 km. Following these studies, next steps will be testing the device in situ, in underwater neutrino telescope, or from a vessel in a sea campaign. (c) 2012 Elsevier B.V. All rights reserved.This work has been supported by the Ministerio de Ciencia e Innovacion (Spanish Government), project references FPA2009-13983-C02-02, ACI2009-1067, Consolider-Ingenio Multidark (CSD2009-00064). It has also been funded by Generalitat Valenciana, Prometeo/2009/26.Adrián Martínez, S.; Ardid Ramírez, M.; Bou Cabo, M.; Larosa, G.; Llorens Alvarez, CD.; Martínez Mora, JA. (2013). A compact acoustic calibrator for ultra-high energy neutrino detection. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 725:219-222. https://doi.org/10.1016/j.nima.2012.11.142S21922272

Mejora de las competencias gracias a la implantación de aprendizaje basado en proyectos en acuicultura

En el presente trabajo se muestra la experiencia de la aplicación del Aprendizaje Basada en proyectos (ABP) en la asignatura “Diseño y Gestión de instalaciones Piscícolas” de la titulación del Máster interuniversitario de Acuicultura de la Universitat Politécnica de València. El ABP consistió en el desarrollo de un proyecto de una piscifactoría, en el cual los alumnos debían integrar los conocimientos adquiridos en las asignaturas previas, permitiendo una visión más multidisciplinar de la asignatura y mejor adquisición de las competencias. Tanto desde el punto de vista del alumnado como del profesor, la implantación del ABP permitió un mayor desarrollo de las competencias, siendo la metodología docente valorada positivamente. Además, se mejoró la participación del alumnado en las actividades propuestas, dando como resultado una mejor calificando académica final. No obstante, se deben de mejorar algunos aspectos como es la planificación del tiempo y consolidar relaciones de integración o la interacción entre diferentes disciplinas/asignaturas de manera que tengan una mejor integración en el proyecto

Aprendizaje basado en proyectos: una propuesta eficaz para el desarrollo de las competencias en el master de Acuicultura

[ES] En el presente trabajo se muestra una experiencia de la aplicación del Aprendizaje Basada en proyectos en la titulación del Master interuniversitario de Acuicultura de la Universitat Politécnica de València. El ABPr se centró en el desarrollo de un proyecto de una piscifactoría, en el cual los alumnos pudieran adquirir una visión en conjunto de las asignaturas impartidas en el máster, fomentando la conexión entre ellas, reforzando, por tanto, el carácter interdisciplinar del proyecto. Para evaluar la metodología se realizó cuestionario cuantitativo y otro cualitativo con el objetivo de conocer las opiniones de los alumnos. Los alumnos han valorado positivamente la metodología, destacando la importancia del proyecto desarrollado para su formación profesional, así como también se valoró sustancialmente que el trabajo desarrollado en grupo cumplió sus expectativas en cuanto a la labor de los docentes. Aunque no se observaron valoraciones negativas de la metodología desarrollada, se deben de mejorar algunos aspectos como la planificación del tiempo y consolidar relaciones de integración o la interacción entre diferentes disciplinas/asignaturas.[EN] This work shows an of Project Based Learning experience on Interuniversity Master of Aquaculture degree at the Universitat Politécnica de València. The ABPr focused on the development of a fish farm project, in which the students could acquire a combined vision of the subjects taught during the master's degree, promoting the connection between subjects, thus reinforcing the interdisciplinary character of the project. To evaluate the methodology, a quantitative and a qualitative survey was conducted with the aim to know the students opinions. The students have positively valued the methodology, highlighting the importance of the project developed for their professional training, as well as the fact that the project carried out as teamwork met their expectations regarding the teachers´work. Although no negative evaluations about the developed methodology were observed, some aspects such as time scheduling, and the integration of additional subjects/ disciplines should be improved.Martínez-Llorens, S.; Jauralde García, I.; S. Peñaranda, D.; Tomás-Vidal, A.; Jover Cerdá, M. (2021). Aprendizaje basado en proyectos: una propuesta eficaz para el desarrollo de las competencias en el master de Acuicultura. En IN-RED 2020: VI Congreso de Innovación Educativa y Docencia en Red. Editorial Universitat Politècnica de València. 208-2017. https://doi.org/10.4995/INRED2020.2020.11988OCS208201

Blending learning: Una nueva forma de enfocar las sesiones prácticas

Las competencias son elementos muy apreciados por los empleadores, en especial las relacionadas con el pensamiento práctico. Esta realidad es más evidente en las sesiones prácticas de laboratorio, donde los alumnos deben aplicar conocimientos teóricos a casos prácticos. En el actual trabajo se pretende implantar la metodología docente “Blended learning” que combina docencia presencial con on line, con el fin de favorecer la adquisición de la competencia transversal “Aplicación y pensamiento práctico”, así como una mayor interiorización de los conceptos aprendidos. La metodología docente se implantó en alumnos de grado, en concreto en las sesiones de laboratorio de la asignatura: Fisiología Animal y Humana (11109) del segundo curso del Grado en Biotecnología de la Universitat Politècnica de València. Los resultados obtenidos mostraron que la implantación de la metodología docente permitió desarrollar el pensamiento práctico, ya que la nota media categórica fue de “A: Excelente”. Además, se observó una mejora en la calificación de la nota del examen teórico-práctico, lo que indica una mejor interiorización de los conceptos impartidos. Por tanto, se puede concluir que la metodología “Blended learning” ha sido una metodología eficaz para no sólo mejorar la adquisición de la competencia transversal, sino también para la calificación académica