نتایج جستجو برای: rotational inertia
تعداد نتایج: 42125 فیلتر نتایج به سال:
A body dissipates energy when it freely rotates about any axis different from the axis of the maximal moment of inertia. The effect stems from the fact that the spin about the major-inertia axis corresponds to the minimal kinetic energy, for a fixed angular momentum. Thence one may expect comets and asteroids (as well as spacecrafts or cosmic-dust granules) stay in this, so-called principal, st...
Aims. We show a possible explanation for the recently reported secular increase of the Astronomical Unit (AU) by Krasinsky and Brumberg (2004). Methods. The mechanism proposed is analogous to the tidal acceleration in the Earth-Moon system, which is based on the conservation of the total angular momentum and we apply this scenario to the Sun-planets system. Results. Assuming the existence of so...
In the future, renewable energy sources will contribute a significant share if not the majority of our energy supply. Especially for the electricity sector this means a radical transformation from current practise. The current infrastructure will in part need to be adapted but in part also to be rebuilt. This reorganisation taking place during “operation” increases the difficulty of the task at...
There are currently two well-accepted models that explain how pulsars exhibit glitches, sudden changes in their regular rotational spin-down. According to the starquake model, the glitch healing parameter, Q, which is measurable in some cases from pulsar timing, should be equal to the ratio of the moment of inertia of the superfluid core of a neutron star (NS) to its total moment of inertia. Me...
Bumblebee foragers spend a significant portion of their lives transporting nectar and pollen, often carrying loads equivalent to more than half their body mass. Whereas nectar is stored in the abdomen near the bee's center of mass, pollen is carried on the hind legs, farther from the center of mass. We examine how load position changes the rotational moment of inertia in bumblebees and whether ...
We present a simple two-step method by which one-dimensional spectra of horizontal velocity and buoyancy measured along a ship track can be decomposed into a wave component consisting of inertia–gravity waves and a vortex component consisting of a horizontal flow in geostrophic balance. The method requires certain assumptions for the data regarding stationarity, homogeneity, and horizontal isot...
The dynamical moments of inertia (Jisl) of superdeformed bands in the A 150 Gd-Dy and A ~190 Hg-Pb regions are fairly well reproduced by standard cranking calculations [1, 2]. However, for the superdeformed or highly deformed A~135 Ce-Nd-Sm region, this is not true at all, and has presented a theoretical problem for some time. Several solutions in terms of quenched proton pairing [3] and a stro...
Control systems that have the ability, in the one hand, to detect incipient failures in sensors and/or actuators and, in the other hand, to adapt quickly the control laws in order to preserve the specified performance in terms of production quality, safety, etc., are called fault-tolerant control systems (Blanke et al., 2001), (Blanke et al., 2006). This kind of systems have become increasingly...
Recently we reported the observation of superfluidity in solid He confined inside porous Vycor glass with characteristic pore diameter of 7 nm [1], porous gold with pore diameter of 490 nm [2] and also in bulk solid He [3]. In the bulk experiment solid helium is confined in an annular channel inside the torsion bob (see inset III of Fig.1). The width, depth and outer diameter of the channel are...
As an extension of our previous study, the flow and mixing characteristics of a serpentine mixer in non-creeping flow conditions are investigated numerically. A periodic velocity field is obtained for each spatially periodic channel with the Reynolds number (Re) ranging from 0.1 to 70 and the channel aspect ratio from 0.25 to one. The flow kinematics is visualized by plotting the manifold of th...
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