45 research outputs found
Non-destructive Investigation of “The Violinist” a Lead Sculpture by Pablo Gargallo, Using the Neutron Imaging Facility NEUTRA in the Paul Scherrer Institute
Get PDFAbstractThe Violinist (1920), the only sculpture made by Gargallo using lead sheet and wood, is being corroded by carbonation, most probably due to the organic vapours released by the wood inside, a material not chemically compatible with lead. Hydrogen plasma has been tested and proved to be an effective treatment meaning that the sculpture has to be dismantled in order to give the plasma gas access to the lead carbonate crusts on the inner surface of the lead sheet. Prior to dismantling, a complete exploration and diagnosis of this lead sculpture has been carried out through neutron imaging at the Paul Scherrer Institute. This non-destructive technique has produced different sets of images including radiography, tomography and 3D reconstruction. Despite the presence of a core made of an organic material such as wood, the digital processing of the images and their in depth visual analysis have yielded new three-dimensional information of inaccessible details of the sculpture, allowing us to assess its present state of conservation and the manufacturing technique and materials used by the artist. The results presented in this article highlight how information from neutron imaging can be of great value when it comes to set the strategies for future conservation treatmen
An impacting energy harvester through piezoelectric device for oscillating water flow
Get PDFThe reduced power requirements of miniaturized electronics offers the opportunity to create devices having their power supply based on
energy harvesters. In this paper a new idea is proposed and studied to supply underwater low-consumption devices using low-cost disk
piezoelectric elements. The system scavenges
energy from water motion induced in depth by
surface gravity waves using piezoelectric materials
and the characteristic oscillating movement of
bodies with positive buoyancy that are attached to
the seabed with flexible cords, similar to an
inverted pendulum. The piezoelectric components
that are subjected to impacts produced by the
movement of the pendulum create an electrical
power generator that harvests the mechanical
energy brought by the sea movements. A prototype
with the proposed electronic harvesting system is
built and tested. The average power output of the
prototype is 2.2 ± 0.3 µW, which can be increased
signi¿cantly with further optimization.Peer ReviewedPostprint (published version
New Mediterranean Biodiversity Records (July 2019)
Get PDFThis is the second collective paper issued in 2019, currently amalgamates new knowledge on the Mediterranean geographic distributions of 17 species from five phyla (six aliens, three cosmopolitans, two east Atlantic records and six natives). The acknowledged species were reported from ten countries, mentioned here from west to east: Spain: first report of the east Atlantic grouper Cephalopholis taeniops in the western Mediterranean and an inclusion of Pontarachna puntulum and Litarachna communis to the pontarachnid fauna of Spain; Morocco: first record of Solea senegalensis from the Moroccan Mediterranean coast; Algeria: a valid confirmation for the presence of Sardinella maderensis; Malta: a first record of the Red Sea stomatopod Erugosquilla massavensis; Italy: a rare observation of the crab Paragalene longicrura from Siciliy and a further integration of the alien brown shrimp Penaeus aztecus to the commercial catch in Sicily; Montenegro: a first record of the Lessepsian bigfin reef squid Sepioteuthis lessoniana from the Adriatic Sea; Turkey: northernmost documentation of the Mediterranean flatworm Prostheceraeus giesbrechtii in the Aegean Sea; Israel: a solid confirmation for the population establishment of both the alien rock shrimp Sicyonia lancifer and two species of angelfish, and a first and deepest record of the crystalline goby Odondebuenia balearica; Lebanon: first record of the jellyfish Pelagia noctiluca; Syria: first records of the crown jellyfish Nausithoe punctate and the smallscale codlet Bregmaceros nectabanus
Two new nematode records for the Spanish Coast: Draconema claparedii (Metschnikoff, 1867) Filipjev, 1918, and Prochaetosoma vitielloi Allen & Noffsinger, 1978
No full text10 pages, 3 figures, 2 tables[EN] Draconema claparedii and Prochaetosoma vitielloi, two new nematode records for the Spanish coast, are reported from five sea stations at the Mediterranean. This paper presents morphotogical data from both species and summarizes the distribution of the Draconenatidae recorded up to now along the Spanish coast. [...] Draconema ophicephalum, Draconema japonicum, Dracognomus tinae, Prochaetosomatinae, Draconema sephalatum, Draconema claparedii [...][ES] Draconema claparedii (Metschnikoff, 1867) Filipjev, 1918, y Prochaetosoma vitielloi Allen & Noffsinger, 1978, son cittadas por primera vez para la nematofauna española. Los especímenes estudiados proceden de cinco estaciones del litoral Mediterráneo. Se analizan los principales caracteres morfológicos de ambas especies y se resume la distribución de los distintos Draconematidae citados hasta ahora en las costas españolasPeer Reviewe
Infestation of some mediterranean bracyuran crabs by the polychaete Iphitime cuenoti
No full text14 páginas, 4 tablas, 6 figuras[EN] The branchial chambers of some brachyuran crabs of the species Liocarcinus depurator, Macropipus tuberculatus, and Goneplax rhomboides have been found to be infested by the polychaete
Iphitime cuenoti. Here we provide an account of the intensity and prevalence of the infestation and their relationship to body size, sex, and depth inhabited by the hosts. The frequency of infested animals were 5,5 % for L. depurator, and 12,3 % for M. tuberculatus. Infestation prevalence increases in both species with host size, and in L. depurator also increases towards deeper habitats. The statistical distribution of
infestation intensity fits a contagious distribution for L. depurator and M. tuberculatus[FR] La présence du Polychète Iphitime cuenoti a été détectée dans les chambres branchiales des brachyoures Liocarcinus depurator, Macropipus tuberculatus et Goneplax rhomboides. Les caractéristiques de l'infestation sont étudiées : intensité et prévalence de l'infestation en relation avec la taille, le sexe et la profondeur de capture de l'hôte. La fréquence d'individus infestés par I. cuenoti est de 5,5 % et 12,3 %, respectivement pour L. depurator et M. tuberculatus. Chez L. depurator, la prévalence augmente avec la profondeur. Chez ces deux hôtes, la prévalence augmente avec leur taille. L'intensité de l'infestation présente des caractéristiques de distribution contagieuse[ES] Ha sido observada la presencia del poliqueto Iphitime cuenoti en las cámaras branquiales de los braquiuros Liocarcinus depurator, Macropipus tuberculatus y Goneplax rhomboides. Se describen y analizan las características de la infestación: intensidad y prevalencia de la infestación en función de la talla, sexo y profundidad de captura del huésped. Un 5,5 % y un 12,3 %, respectivamente para L. depurator y M. tuberculatus, de los individuos examinados han resultado estar infestados por I. cuenoti. En L. depurator la prevalencia aumenta con la profundidad. En ambas especies la prevalencia aumenta con la talla del huésped. La intensidad de la infestación presenta características de distribución de contagioPeer reviewe
