Context. The standard dynamo model for the solar and stellar magnetic fields is based on the αΩ mechanism, namely, an interplay between differential rotation (the Ω effect) and a mean electromotive force generated by helical turbulent convection flows (the α effect). There are, however, a number of problems with the α effect and αΩ dynamo models. Two of them are that, in the case of the Sun, th...

In modern computer systems, long-running jobs are divided into a large number of short tasks and executed in parallel. As the system size and complexity scales up, the task service times become highly random and the job service time is constrained by the slowest straggling tasks. An efficient solution is to replicate a task on multiple servers and wait for one task copy to finish early. However...

In this paper, the flow-field of an incompressible viscous flow past a solid-sphere at low Reynolds numbers (up to 270) is investigated numerically. In order to extend the capabilities of the finite volume method, the boundary (body) fitted coordinates (BFC) method is used. Transformation of the partial differential equations to algebraic relations is based on the finite-volume method with coll...

In this paper, the flow-field of an incompressible viscous flow past a solid-sphere at low Reynolds numbers (up to 270) is investigated numerically. In order to extend the capabilities of the finite volume method, the boundary (body) fitted coordinates (BFC) method is used. Transformation of the partial differential equations to algebraic relations is based on the finite-volume method with coll...

A new class of singlet superconductors with a gap function ∆(k, ωn) which is odd in both momentum and Matsubara frequency is considered. Some of the physical properties of this superconductivity are discussed and it is argued that: i) the electron-phonon interaction can produce this kind of pairing, ii) in many cases there is no gap in the quasiparticle spectrum, iii) these superconductors will...

in this paper, by modifying cheng-yau$'$s technique to complete hypersurfaces in $s^{n+1}(1)$, we prove a rigidity theorem under the hypothesis of the mean curvature and the normalized scalar curvature being linearly related which improve the result of [h. li, hypersurfaces with constant scalar curvature in space forms, {em math. ann.} {305} (1996), 665--672].

purpose the purpose of the present study was to evaluate effects of regular practice of sun salutation on muscle strength, general body endurance and body composition. methods subjects (49 male and 30 female) performed 24 cycles of sun salutation, 6 days a week for 24 weeks. upper body muscle strength was determined by 1 repetition maximum (1rm) for bench press and shoulder press technique. bac...

In this paper, we present a physical modeling activity whose objective is to allow students determine the differences between disk and sphere using pure scientific criteria. Thereunto, reproduce Sun-Earth-Moon system with low-cost materials compare illumination effects on Moon considering two possible shapes for it (a disk). The analysis based shape of Terminator line produced in each case as f...