Eddy current magnetic signature is, together with magnetization of ferromagnetic hull, mechanisms and devices on board, corrosion related and stray field sources one of the main sources of ship’s magnetic signature. Due to roll, pitch and yaw of the ship in external magnetic field, eddy currents are induced in conducting materials on board ship, mainly in conducting hull. Flow of those currents is a source of magnetic field around a ship. Principal eddy current component is related to roll movement as it depends on rate of change of external field which is the highest for roll. Induced currents have both in-phase and quadrature components. Magnitude of the eddy current magnetic field can have significant effect on total magnetic field signature after degaussing for ships such as mine sweepers and mine hunters. Paper presents calculations and simulations as well as measurements of model and physical scale model made of low magnetic steel performed in Maritime Technology Center. Contribution of eddy current magnetic field in total field in low roll frequencies has been estimated.
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situations of everyday life mobilities. This then takes place on a theoretical and philosophical backcloth of what elsewhere has been termed ‘material pragmatism’ ( Jensen 2016 ; Jensen & Lanng 2017 ). The key argument in this paper is therefore that exploring concrete mobile situations in the light of mobilities design opens up a different way of engaging with one of the key dimensions of the contemporary city; making sense of the increasing flow of people, goods, vehicles, and information.
The structure of the paper is the following. After the introduction, we move
of the crucial tasks in the revitalization processes.
We may define various types of linear structures requiring revitalization: infrastructural, urban, those related to a specific type of land use, and natural.
Within transportation systems there are, for example:
Roads of different classes as barriers cutting between urban structures;
Roads as sources of threats, being the ecological barrier for the free flow of living matter, causing a lack of ecological connectivity;
Abandoned, extensively developed and non-operational railway tracks, often of large
and materials. I remember myself during my university studies preparing a seminar thesis about local government housing politics in Považská Bystrica, one of the “typical” Slovak (post-)socialist towns. Talking with a construction engineer associated with one of the first renewal projects targeted at panel houses, he explained to me that the panels themselves can hold together for many more years, but the steel joints holding the panels together are the weak point of the houses since they can be subject to corrosion. I will not contemplate here whether such an