One of the effective steps in use of water resources is accurate estimation of plants water requirement. Lack of accurate estimation of this amount leads to water loss and failure to achieve optimum yield, reduced potential of production, soil resources degradation by too much irrigation or lack of enough leaching and salinization of soils by irrigation less than necessary level, which would ul...

We report the detection of a radial velocity companion to SDSS J091709.55+463821.8, the lowest mass white dwarf currently known with M ∼ 0.17M⊙. The radial velocity of the white dwarf shows variations with a semiamplitude of 148.8 ± 6.9 km s and a period of 7.5936 ± 0.0024 hours, which implies a companion mass of M ≥ 0.28M⊙. The lack of evidence of a companion in the optical photometry forces a...

In 1990 J-L. Krivine introduced the notion of storage operators. They are λ-terms which simulate call-by-value in the call-by-name strategy and they can be used in order to modelize assignment instructions. J-L. Krivine has shown that there is a very simple second order type in AF2 type system for storage operators using Gődel translation of classical to intuitionistic logic. In order to modeli...

Independence in everyday life is a concern of many frail older people. There is a vision that in the near future this group will considerably gain independence and improve their quality of life by relying not only on human caregivers – who cannot grant round-the-clock assistance – but in addition on smart computer-based help capable of imitating human care-giving behaviour. This vision is expre...

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In this paper we integrate a humanoid robot with a powered wheelchair with the aim of lowering the cognitive requirements needed for powered mobility. We propose two roles for this companion: pointing out obstacles and giving directions. We show that children enjoyed driving with the humanoid companion by their side during a field-trial in an uncontrolled environment. Moreover, we present the r...

let $p(lambda)$ be an $n$-square complex matrix polynomial, and $1 leq k leq n$ be a positive integer. in this paper, some algebraic and geometrical properties of the $k$-numerical range of $p(lambda)$ are investigated. in particular, the relationship between the $k$-numerical range of $p(lambda)$ and the $k$-numerical range of its companion linearization is stated. moreover, the $k$-numerical ...