Abstract. We show that Be stars belong to a high velocity tail of a single B-type star rotational velocity distribution in the main sequence (MS). We studied 127 galactic field Be stars and obtained their true equatorial velocity at the ZAMS using models of stellar evolution with rotation

technique is Optimal Reciprocal Colli-sion Avoidance (ORCA). Despite being fast and ecient for circular-shaped agents, ORCA may deadlock when polygonal shapes are used. To address this shortcom-ing, we introduce Reciprocally-Rotating Velocity Obstacles (RRVO). RRVO extends ORCA by introducing a notion

Abstract not found

Abstract- Hydropower from the river is one of the best renewable sources. Hydropower source is predictable compared to wind or solar energy. For generation of electricity using the kinetic energy of natural water resources, Savonius rotor is one of the best types of turbine. The Savonius turbine is more popular as wind turbine. However, in present work, attempt is made for use of Savonius rotor as hydro turbine application. A 3D computational model built and analyzed using a Computational Fluid Dynamic (CFD) analysis using ANSYS. The effect of overlap ratio is investigated for performance enhancement Savonius turbine. In present investigation three different overlap ratios, 0.0, 0.1 and 0.2 are studied, at different angular speeds of rotor. It is found that the maximum torque can be obtained at overlap ratio of 0.2.

Direct determination of the epicycle frequency in the galactic

UVES spectra of young brown dwarfs in Cha I:

The identification of Be-shell stars as edge-on 'normal ' Be stars is tested, whilst a new method for calculating the distribution of equatorial rotational velocities as a fraction of the break-up velocity is developed. This may be measured directly from complete samples of Be-shell stars

Context. In previous works of this series, we have shown that late B- and early A-type stars have genuine bimodal distributions of rotational velocities and that late A-type stars lack slow rotators. The distributions of the surface angular velocity ratio Ω/Ωcrit (Ωcrit is the critical angular

We present spectroscopic rotation velocities (v sin i) for 56 M dwarf stars using high resolution HET HRS red spectroscopy. In addition we have also determined photometric effective temperatures, masses and metallicities ([Fe/H]) for some stars observed here and in the literature where we could

We have obtained projected rotation velocities (vrot sin i) of a sample of 19 ultracool dwarfs with spectral types in the interval M6.5–T8 using high-resolution, near-infrared spectra obtained with NIRSPEC and the Keck II telescope. Among our targets there are two young brown dwarfs, two likely