1,354,335 research outputs found
New record of Mediomastus fragilis Rasmussen, 1973 for the italian fauna and notes on the genus Mediomastus Hartmann,1944 (Plychaeta, Capitellidae)
No full textObservations on the genus Branchiomaldane (Polychaeta: Arenicolidae) with a new record for the italian fauna: Branchiomaldane vincenti Langerhans, 1881
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Ecological analysis of some Syllidae (Anellida, Polychaeta) from the central Tyrrhenian Sea (Ponza Island)
No full textFirst report of Questidae (Anellida, Polychaeta) in the Mediterranean Sea: Questa caudicirra Hartman
No full textLong-term changes in the structure of a polychaete community on artificial habitats
No full textA mediterranean polychaete community was studied for 10 years since the first settlement to examine community dynamics and to compare it with the model proposed by Hughes (1984) for benthic invertebrates. Cluster analysis (Q-mode) pointed out the presence of four main periods during the colonization process in agreement with edaphic changes produced by the colonization and disappearance of mussels. During this time the pattern of species abundance changed from a log series distribution (with few dominant species) towards a truncated log normal distribution (with many rare species) characteristic of a more complex community structure
On situ vibration based structural health monitoring of a railway steel truss bridge: a preliminary numerical study
No full textRailway network is subject to increasing travelling loads and traffic frequency. In
addition, since most of the bridges were built in the last century, they are subject to ageing and
degradation. It is therefore necessary to develop proper structural health monitoring systems
that can support periodical visual inspections. In this context, direct monitoring systems
represent an important and promising solution for structural health monitoring purposes. This
paper is the result of a numerical study performed on a 3D FE bridge model based on an
existing structure: the latter is a Warren truss railway bridge, located in Northern Italy, built
few years after the end of the second world war. The purpose of the study is to numerically
evaluate the effectiveness in damage detection and localization of different vibration-based
techniques. This analysis has been performed for a set of different damage scenarios, suggested
by the infrastructure managers
First report of Leiochrides australis Augener, 1914 (Polychaeta, Capitellida) from the Mediterranean Sea and notes on the genus Leiochrides
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Polychaete depth distribution in a Posidonia oceanica bed (rhizome and matta strata) and neighbouring soft and hard bottoms
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