An empirical fetch-limited ocean wave spectrum has been combined with an acoustic ray-based model to predict the acoustic signal time-angle fluctuations induced by sea surface roughness. Rough sea surface realizations are generated and used as sea surface boundaries with the acoustic model. To validate this model, results are compared against experimental data collected in a fetch limited regio...

Correspondence to: I. G. Stevens Abstract. A fine-resolution primitive equation numerical model is constructed for the Iberian continental shelf and slope region, with open boundaries to the north, south and west. The model is forced by climatological wind fields and relaxed at the surface to climatological temperature and salinity fields. A series of numerical experiments is conducted to inves...

In this study, we discuss a supervised texture-based image segmentation algorithm. We apply this algorithm to airborne high-resolution elevation (LiDAR) and multi-spectral imagery (CASI) of a coastal area on the northwest coast of England. Texture is modelled with the joint distribution of the Local Binary Pattern (LBP) operator and local variance. Spatial objects are derived from the imagery b...

Dispersal and adaptation are the two primary mechanisms that set the range distributions for a population or species. As such, understanding how these mechanisms interact in marine organisms in particular - with capacity for long-range dispersal and a poor understanding of what selective environments species are responding to - can provide useful insights for the exploration of biogeographic pa...

Increasing globalization has spread invasive marine organisms, but it is not well understood why some species invade more readily than others. It is also poorly understood how species’ range limits are set generally, let alone how anthropogenic climate change may disrupt existing species boundaries. We find a quantitative relationship that determines if a coastal species with a benthic adult st...

in the present paper, the aeroelastic stability of helicopter rotor blade is determined using aeroelastic frequency response function. the aeroelastic model of blade is obtained by combining dowell - hodges beam model with loewy unsteady aerodynamic theory which considers an unsteady wake beneath the rotor. equations are formed and aeroelastic frequency response functions are obtained by invert...

Büchi’s theorem, in establishing the equivalence between languages definable in S1S over pP,ăq and the ω-regular languages also demonstrated that S1S over pP,ăq is no more expressive than its existential fragment. It is also easy to see that S1S over pP,ăq is equi-expressive with S1S over pP, sq. However, it is not immediately obvious whether it is possible to adapt Büchi’s argument to establis...

Gold alloys with Cu contents of 10 mass%, 20%, and 30% were used for morphological observation of porous surface structures after heating at 800 degrees C in air followed by pickling with acid solution. With increasing Cu content in the gold alloy, the internal oxidation zone became well-developed in the alloy matrix. The mechanism by which a porous structure was formed on the surface of a gold...

... When once the engine shall have been constructed, the difficulty shall ha1)e been reduced to the making out of cards; but as these are merely the translation of algebraical formulae, it will, by means of some simple notations, be easy to consign the execution of them to a workman. Thus, the whole intellectual labour will be limited to the preparation of the formulae, which must be adapted f...