We observe the acoustic velocity oscillations in and near active region NOAA 10960 on 8 June, 2007 using observations from the IBIS instrument at the Dunn Solar Telescope at NSO/Sacramento Peak and simultaneous Hinode BFI/SP data. Inversions were performed on the spectropolarimetric datasets in order to get magnetic field information for the AR. A time series of Doppler maps from line bisectors...

In Euclid’s The Elements, a unique circle in R2 is determined by three noncollinear points. This is proven geometrically by constructing a triangle from the three points and showing that the intersection of the perpendicular bisectors of two sides of the triangle gives a point that is equidistant from all three vertices of the triangle [1]. This point is said to define the center of a circle wh...

In this report we concentrate on exact construction and maintenance of arrangements induced by arcs of great circles embedded on the sphere, also known as geodesic arcs, and exact computation of Voronoi diagrams on the sphere, the bisectors of which are geodesic arcs. This class of Voronoi diagrams includes the subclass of Voronoi diagrams of points and its generalization, power diagrams, also ...

The normalform h= 0 of a curve (surface) is a generalization of the Hesse normalform of a line in R2 (plane in R3). It was introduced and applied to curve and surface design in recent papers. For determining the curvature of a curve (surface) defined via normalforms it is necessary to have formulas for the second derivatives of the normalform function h depending on the unit normal and the norm...

We present first realistic numerical simulations of 3D radiative convection in the surface layers of main sequence A-type stars with T eff = 8000 K and 8500 K, log g = 4.4 and 4.0, recently performed with the CO 5 BOLD radiation hydrodynamics code. The resulting models are used to investigate the structure of the H+He I and the He II convection zones in comparison with the predictions of local ...

With more than 80 transits observed in the CoRoT light curve with a cadence of 32 s, CoRoT-Exo-2b provides an excellent case to search for the secondary eclipse of the planet, with an expected signal of less than 10 in relative flux. The activity of the star causes a modulation on the flux that makes the detection of this signal challenging. We describe the technique used to seek for the second...

Wireless Sensor Networks (WSN) consists of distributed low-cost sensing nodes with autonomous network. Several anomalies can occur in wireless sensor networks that may form various coverage holes. These holes may disturb the existing coverage or connectivity, and impair desired functionalities of networks. Hence, it is essential to detect and recovery coverage holes in order to ensure the full ...

Embeddings of various graph classes into hypercubes have been widely studied. Almost all these classes are regularly structured graphs such as meshes, complete trees or pyramids. In this paper, we present a general method for one-to-one embeddings of irregularly structured graphs into their optimal hypercubes, based on extended edge bisectors of graphs. An extended edge bisector is an edge bise...

The components of the wide binary HD 219542 were recently found to differ in metallicity by about 0.1 dex (Gratton et al. 2001b). In this paper, we present the results of 2 years of high precision radial velocity monitoring of these stars performed at the Telecopio Nazionale Galileo (TNG) using the high resolution spectrograph SARG. No indication for radial velocity variations above the measure...

We present a real-time algorithm for computing the Voronoi diagram of planar freeform piecewise-spiral curves. The efficiency and robustness of our algorithm is based on a simple topological structure of Voronoi cells for spirals. Using a Möbius transformation, we provide an efficient search for maximal disks. The correct topology of Voronoi diagram is computed by sampling maximal disks systema...