With coasts that form three >1700 km arms which spiral outward from a point near Kodiak Island, Alaska provides a large-scale site for the study of the relationship between geodesy and sea level. The surface of a static, uniform ocean will follow an equipotential, orthometric surface. Long lived geostrophic currents or prevailing winds result in localized and large scale variations between its ...

This paper deals with a datum search game, where a target reveals his position (datum point) a t a certain time (datum time) and a pursuer begins the search for the target by distributing his searching effort some time later The target might move in the diffusive fashion from the datum point to evade his pursuer His motion is restricted by its continuity in a two-dimensional space and constrain...

Standard model-based redatuming techniques consist in applying time shifts to the surface data, to simulate an acquisition made at depth. The time shifts are computed using prior knowledge of the overburden, such as a macro velocity model. These techniques allow focusing of the direct waves at the new datum, but the focus can be degraded because of surface multiples and internal multiples in th...

The creation of geometrical plan on the boundary of two cadastral areas with a digitized cadastral map. After reconstruction of communication passing through two cadastral areas, geometrical plans were made for the property dividing for each areas independently. The cadastral boundary is a water flow. The digitized cadastral maps of the former cadastre in the Cassini soldner datum in the scale ...

For high-speed control of robots, a good knowledge of system modelling is necessary to obtain the desired bandwidth. In this paper, we present a cartesian robot with a pan/tilt unit in end-effector (5 dof). This robot is implemented with powerful direct drive AC induction machines. The dynamic model, parameter identification and model validation of the robot are studied (including actuators). T...

MOTIVATION Dynamic simulations of systems with biologically relevant sizes and time scales are critical for understanding macromolecular functioning. Coarse-grained representations combined with normal mode analysis (NMA) have been established as an alternative to atomistic simulations. The versatility and efficiency of current approaches normally based on Cartesian coordinates can be greatly e...

We propose the use of the Gabriel graph for the exploratory analysis of potentially high dimensional labeled data. Gabriel graph is a subgraph of the Delaunay triangulation, which connects two data points vi and vj for which there is no other point vk inside the open ball with diameter [vivj ]. If all the Gabriel neighbors of a datum have a different class than its own, this datum is said to be...

We study existence and positivity properties for solutions of Cauchy problems for both linear and semilinear parabolic equations with the biharmonic operator as elliptic principal part. The self-similar kernel of the parabolic operator ∂t + ∆ 2 is a sign changing function and the solution of the evolution problem with a positive initial datum may display almost instantaneous change of sign. We ...