A model of A model of toroidal rotation reversal ... - Florin Spineanu
A model of toroidal rotation reversal rotation reversal based on inverse based on inverse ... taken on the same time scale by the time-variation of the electric field:.
A model of toroidal rotation reversal based on inverse Ranque Ranque--Hilsch effect
Florin Spineanu and Madalina Vlad Association EURATOM – MEdC Romania National Institute of Laser, Plasma and Radiation Physics, Bucharest, Romania
Spineanu Oxford 2011
What is the Ranque – Hilsch effect (and why its inverse is interesting for tokamak) A VORTEX TUBE is a cylinder where air Is injected tangentially at high pressure pressure. There are two ouput locations: - At the circumference (the other side) - On the axis (the same side as the input) It separates the temperatures: - At the tangential output air is HOT - At the axial output air is COLD p as that. You can buyy one,, but As simple still we do not understand how it works.
Spineanu Oxford 2011
One of the hypothesis: Colgate and Lovelace Formation of planets in accretion disks: - Loss of azimuthal symmetry by generation of convection cells
Three coupled components: 1. Poloidal rotation 1 2. Convection cells breaking the azimuthal symmetry 3. gradient of temperature
Inverse RH:
1. Gradient of temperature 2. Convection cells breaking azimuthal symmetry 3. Poloidal rotation Spineanu Oxford 2011
Convection cells: not quite conventional
1 ∂T uθ = c eB ∂r
The equilibrium poloidal rotation
C=1 1.17 17 = - 0.5 = - 2.1
banana plateau Pfirsch-Schluter
Transformation of sheared poloidal rotation into a chain of rolls with the same sign of the vorticity
The poloidal velocity is directly sustained by the gradient of pressure via the baroclinic term The peripheric velocity of the chain of rolls Generates an envelope which is the poloidal velocity Fast time variation of the poloidal velocity can only be taken on the same time scale by the time-variation of the electric field:
∂vθ ∂Er →− ∂t ∂t
Spineanu Oxford 2011
2 c ⎛ ∂Er ⎞ 3/ 2 jr = ε ⎟ 2 ⎜ ∂t ⎠ v Aθ ⎝ ∂t
Every bounce the precession of the banana is accelerated with a small velocity increase
We have studied these equations in relation with concrete applications of major interest for .... get concentrated into such narrow, almost string-like, vortices?
anomalous polytropic (Chaplygin) gases. The parallel dynamics is ..... Vortex nucleation is a process that appears when the vorticity goes beyond a certain level.
the diamagnetic force in the r direction; [note that the diamagnetic force in the ..... The group of terms in the equation for the correction to the distribution function.
it is necessary to know what it may be expected and which are the targets for a possible system of ... Figure 3: Complex eigenvalues of the velocity gradient tensor. Yates and .... Define the probability pi to find a point of the set inside a specifi
3 Property Grammars. The Property Grammars (PG) approach [Blache05a] is purely constraint-based: all syntactic information is represented by means of ...
equation, the magnetic field appears as a noise whose statistical properties are ...... that for a quadratic action the value of the functional integral in (A 7) is.
the diamagnetic force in the r direction; [note that the diamagnetic force in the Russian ...... NOTE that this is the usual neoclassical correction to the equilibrium.
stress [for example in the classical Rayleigh-Benard (RB) system] the purely conductive ... nism that has been studied is the tilting instability of eddies with creation, ... cross section is in plateau - banana and part is in Pfirsch-Schluter regime
consider that molecular species may be present in the hot regions. So, the plasma ... The 2-dimensional model that was set up was furthered by a study of the.
Elektra program. References. [1] A. Bergqvist, G. Engdahl, A thermodynamic representation of pseudoparticles with hysteresis, IEEE Trans. Magn. 31. (6) (1995) ...
The second principle of thermodynamics gives us a stone-solid truth: the entropy will ever grow. But, as Loschmidt has noticed to. Boltzmann, only in the average ...
muscles into one equivalent agonist muscle, and wrist flexor muscles into ... Define cfi and cei to be the fixed connection weights that determine the strength of ...
A dynamic bioeconomic model of ivory trade is used to investigate the efficacy of conser- vation payments, tourism benefits, quota regimes and a trade ban on the protection of the African elephant (Laxadonta africana). The model consists of four ivor
ample English (Lambek 2004), French (Bargelli & Lambek. 2001b) .... 2. Pregroup semantics for grammatical types. Pregroup semantics was proposed by Lambek as a substitute for the. Lambek ..... Interestingly, in the world of relations (but not functio
In section 4, the implementation on a real robot is given. Then ... (communication and learning) which provides two roles: the role of imitator and the role of model. .... a simple homeostatic architecture as a bootstrap for interaction and imitation
They are inspired by the anatomy and electrophysiology of eye-movement selection related brain regions. These regions (fig. 1), the superior colliculus (SC), the.
Mar 14, 2012 - that this model is based on learning the statistical temporal dependencies linking the stimuli within the .... (Psychology Software Tools). MEG/EEG ..... increasingly diluted with elapsed time, thus explaining that, in the standard ...
quence of words in each channel must also be annotated with timestampsâa realistic assumption both for ASR and human transcription. A significant corpus of ...
1(t)))(Dx(u0) + Dy(u1)) : (Dx(u0) + Dy(u1))(t) dydx. From (7.22), the convergences of the energies (3.21), and (3.22) follow, and the theo- rem is proved.
Jan 23, 2017 - mutual coupling and interplay, constitutive of the cell biology level. On the one hand .... mentary Note 3, equations (30)â(47)). Finally, Meca and ...
May 11, 2007 - Subject to,. The author thanks Gourdel, P. (University of Paris 1, CERMSEM) & Le Van, C. (University of Paris 1, CNRS-CERMSEM) for helpful.
cording to the First Law we can write for the contrac- .... potential, R is the gas constant, and F is Faraday's ..... A DM simulation of this experiment, employ-.
Table 1 further shows that the model taking explicitly into account uncertainty is ... half the trials, this likelihood ratio is the square root, that is only 7.0Ã1031.
