Search results for "shipbuilding"
showing 10 items of 20 documents
Stochastic ship roll motion via path integral method
2010
ABSTRACTThe response of ship roll oscillation under random ice impulsive loads modeled by Poisson arrival process is very important in studying the safety of ships navigation in cold regions. Under both external and parametric random excitations the evolution of the probability density function of roll motion is evaluated using the path integral (PI) approach. The PI method relies on the Chapman-Kolmogorov equation, which governs the response transition probability density functions at two close intervals of time. Once the response probability density function at an early close time is specified, its value at later close time can be evaluated. The PI method is first demonstrated via simple …
Applying Artificial Intelligence Methods to Detect and Classify Fish Calls from the Northern Gulf of Mexico
2021
Passive acoustic monitoring is a method that is commonly used to collect long-term data on soniferous animal presence and abundance. However, these large datasets require substantial effort for manual analysis
The Use of Simulation in the Shipbuilding Production Process
2009
Remarks on the History of the Navy of the Empire of Nicaea in the Light of the Chronicle of Georgios Akropolites
2016
The Empire of Nicaea was a successor of the Byzantium shattered in 1204. In the newly established state marine traditions of Byzantines, remain alive. The best testimony to this, are the evidence contained in the chronicle of Georgios Akropolites, devoted to activities of the rulers of Nicaea, aimed to build their own naval forces. In this paper I'll also try to answer, where was beating the heart of the Nicean shipbuilding industry and how large was the navy of this state. This is important from point of view of the maritime history, because of the fleet of the Empire of Nicaea, filled the gap created after the fall of Constantinople and the Byzantine Empire, which was the local naval powe…
Los veleros de comercio romano del Mediterráneo Occidental : análisis de familias y firmas arquitecturales (s. III a.C. - II d.C.)
2013
La thèse que nous présenté vise, à partir de l’analyse des épaves des navires de commerce romains de la Méditerranée occidentale, à définir des « familles architecturales » à partir de critères significatifs constituant autant de «signatures architecturales » caractéristiques d’une même origine. Ces familles sont ensuite mises en relation, sur le plan chronologique et sur le plan géographique, en liaison avec un espace de navigation donné, afin de déterminer leur origine. Cette démarche se situe, humblement, dans le prolongement des études d’archéologie navale les plus récentes qui ont mis en évidence, sur le plan méthodologique, le rôle des notions de « système architectural », de « famill…
A Methodological Approach to Determine Sound Response Modalities to Coastal Erosion Processes in Mediterranean Andalusia (Spain)
2020
Human occupation along coastal areas has been greatly increasing in recent decades and, in many places, human activities and infrastructures are threatened by erosion processes that can produce relevant economic and human losses. In order to reduce such impacts and design sound management strategies, which can range from the &ldquo
A New Solution for Sea Wave Energy Harvesting, the Proposal of an Ironless Linear Generator
2020
The paper investigates an innovative ironless linear generator, installable inside a wave energy converter, in order to produce electricity from sea waves. This energy source is considered strategic for the future, especially in small islands
Il diportismo nautico e le attività economiche in Sardegna
2013
Operating in a complex globalized world, tourism destinations are continuously challenged to improve their performance in order to stay competitive in a dynamic environment they have to identify new potential markets, to develop networks, clusters and new products. Today the current forms of tourims that are emerging request to spend leisure time as actively as possible and the development of niche tourism with these characteristics can represent a sustainable development strategy for destinations ...
Improving the Downwind Sail Design Process by Means of a Novel FSI Approach
2021
The process of designing a sail can be a challenging task because of the difficulties in predicting the real aerodynamic performance. This is especially true in the case of downwind sails, where the evaluation of the real shapes and aerodynamic forces can be very complex because of turbulent and detached flows and the high-deformable behavior of structures. Of course, numerical methods are very useful and reliable tools to investigate sail performances, and their use, also as a result of the exponential growth of computational resources at a very low cost, is spreading more and more, even in not highly competitive fields. This paper presents a new methodology to support sail designers in ev…
First Evidence of Contourite Drifts in the North-Western Sicilian Active Continental Margin (Southern Tyrrhenian Sea)
2021
We present the results of an integrated geomorphological and seismo-stratigraphic study based on high resolution marine data acquired in the north-western Sicilian continental margin. We document for the first time five contourite drifts (marked as EM1a, EM2b, EM2, EM3a, and EM3b), located in the continental slope at depths between ca. 400 and 1500 m. EM1a,b have been interpreted as elongated mounded drifts. EM1a,b are ca. 3 km long, 1.3 km wide, and have a maximum thickness of 36 m in their center that thins northwards, while EM1b is smaller with a thickness up to 24 m. They are internally characterized by mounded seismic packages dominated by continuous and parallel reflectors. EM2 is loc…