The doppler measurements of stars are diluted and distorted by stellar activity noise. Different choices of noise models and statistical methods have led to much controversy in the confirmation of exoplanet candidates obtained through analysing radial velocity data. To quantify the limitation of various models and methods, we compare different noise models and signal detection criteria for vari...

Context. It is well known that from 1645 to 1715 solar activity was notably low and the number of sunspots extremely reduced. This epoch as Maunder Minimum (MM). The study stars in prolonged minima like MM could help shed light on this enigmatic epoch. Aims. To explore if star $\zeta^{2}$ Ret, which belongs a binary system, state similar MM. We have collected more than 430 spectra acquired betw...

Context. Chromospheric activity produces both photometric and spectroscopic variations that can be mistaken as planets. Large spots crossing the stellar disc can produce planet-like periodic variations in the light curve of a star. These spots clearly affect the spectral line profiles, and their perturbations alter the line centroids creating a radial velocity jitter that might “contaminate” th...

A description of steady-state material transfer through the barrier of the idealized physiological transfer unit, phase 1, membrane, phase 2,-two homogeneous phases separated by a complex barrier-based upon Newton's laws of motion has been outlined previously.1 The supposition was made that the conservative forces tending to drive the kinetic materials through a barrier b can be derived from di...

The establishment of symbiosis between leguminous plants and the soil bacteria Rhizobia is investigated using the Nar or spontaneous nodulation phenomenon, i.e. ability of some plant to develop nodulations in the absence of Rhizobium. It is shown that he spontaneous nodule organogenesis is initialized in both Nar and non-Nar plants but more or less blocked further (at the nodule primordia stage...

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This work addresses the problem of distributed multi-agent localization in presence of heterogeneous measurements and wireless communication. The proposed algorithm integrates low precision global sensors, like GPS and compasses, with more precise relative position (i.e., range plus bearing) sensors. Global sensors are used to reconstruct the absolute position and orientation, while relative se...

Blind channel identification and equalization based on second-order statistics by subspace fitting and linear prediction have received a lot of attention lately. On the other hand, the use of cyclic statistics in fractionally sampled channels has also raised considerable interest. We propose to use these statistics in subspace fitting and linear prediction for (possibly multiuser and multiple a...

The self-assembly of tetradecylamine (C14) and of mixtures of tetradecyl and octadecylamine (C18) molecules from chloroform solutions on mica has been studied using atomic force microscopy (AFM). For pure components selfassembly proceeds more slowly for C14 than for C18. In both cases after equilibrium is reached islands of tilted molecules cover a similar fraction of the surface. Images of fil...