Abstract Planets close to their stars experience an interplanetary magnetic field (IMF) that is dominantly quasi-radial. Our solar system serves as a laboratory study how the occurrence of quasi-radial IMF varies away from star and under different stellar activities. Furthermore, on time spatial scales relevant magnetospheric physics, wind variability prevails in form structures generated both ...

This paper presents the design of a fast and low power consumption distance computation unit : ∑ i(Ai −Bi) . It is dedicated to the digital RBF neural network implementation. The proposed architecture is composed of two parts. The first computes the distance (Ai − Bi), and the second performs the sum of these distances. It is based on an efficient squarer in redundant arithmetic. Thank to this ...

The purpose of this note is mainly pedagogical. An apparent paradox will be described which arises in this connection. From the resolution of this paradox one may learn two things. First, one realizes that there are, in a certain sense, two different kinds of Lorentz contractions. Secondly, one sees most clearly how the nonEuclidean space geometry comes into being if the disc is set rotating. C...

The stated result is likely considered to be “obvious” by most physicists [1]. Yet, there have been recent claims [2, 3, 4, 5, 6] that electromagnetic waves from a bounded source can be generated whose amplitude falls off as 1/ √ r over portions of solid angle in far zone. Mathematically, there exist cylindrical waves whose amplitude falls off as 1/ √ ρ, where ρ is the radial distance in a cyli...

This paper presents a new selforganiz ing type RBF neural network and introduces the Geometric Algebra framework in the neurocomputing eld. Real valued neural nets for function approximation require feature enhancement, dilation and rotation operations and are limited by the Euclidean metric. The authors believe that more general and exible neural networks should be designed in order to capture...

We developed a method to measure relative distances with nanometer accuracy of fluorescent particles of different color in a two-photon scanning fluorescence microscope, with two-channel photon counting detection. The method can be used in the 10-500 nm range, for distances below the resolution limit of standard far field microscopy. The proposed technique is more efficient than the methods usi...

Global gyrokinetic particle simulation and nonlinear gyrokinetic theory find that electron temperature gradient sETGd instability saturates via nonlinear toroidal coupling, which is a nonlocal interaction in the wave vector space that transfers energy successively from unstable modes to damped modes preferentially with lower toroidal mode numbers. The electrostatic ETG turbulence is dominated b...

We have compiled two new Galactic open cluster catalogues. The first one has 119 objects with age, distance and metallicity data, while the second one has 144 objects with both absolute proper motion and radial velocity data, of which 45 clusters also with metallicity data available. An iron radial gradient of about −0.063±0.008 dex kpc−1 is obtained from our sample. By dividing clusters into a...

The identification and observation of planetary nebulae in the Andromeda galaxy (M3I) and its companions provide a powerful means of studying their old stellar populations. The direct determination of chemical abundances and radial velocities for even the brightest individual old stars is impossible at the distance of M31. The strongest emission lines of planetary nebulae are as bright as the e...