Strong electrostatic turbulence in magnetically confined plasmas is characterized by trapping or eddying of particle trajectories produced by the E × B stochastic drift. Trapping is shown to produce strong effects on test particles and on test modes by causing nonstandard trajectory statistics: non-Gaussian distribution, memory effects, and coherence. Trapped trajectories form quasi-coherent st...

This paper is concerned with the linear ODE in the form y(t) = λρ(t)y(t) + b(t), λ < 0 which represents a simplified storage model of the carbon in the soil. In the first part, we show that, for a periodic function ρ(t), a linear drift in the coefficient b(t) involves a linear drift for the solution of this ODE. In the second part, we extend the previous results to a classical heat non-homogene...

A method based on the usage of efˇciency proˇle is proposed to estimate the hit efˇciency of drift chambers with a large number of channels. The performance of the method under real conditions of the detector operation has been tested analysing the experimental data from the HERA-B drift chambers. " ²Ö µÍ¥´±¨ÔËË¥±É¨¢´µ¸É¨¸· ¡ ÉÒ¢ ´¨° ÖÎ¥¥± ¤·¥°Ëµ¢ÒÌ ± ³¥·¸¡µ²ÓϨ³ ±µ²¨Î¥¸É¢µ³ ± ´ ²µ¢ ¶·¥¤²µ¦¥´³¥...

Estimating the deterministic drift and stochastic diffusion parameters from discretely sampled data is fraught with the potential for error. We derive a simple way of estimating the error due to the finite sampling rate in these parameters for a univariate system using a straightforward application of the Itô–Taylor expansion. The error is calculated up to first order in the finite sampling tim...

sensitivity of an electromagnetic type metal detector is directly related to stability, the higher the required sensitivity, the more frequently the rebalancing controls will have to be adjusted. thus, for maximum sensitivity in the head ,the use of automatic drift compensation network is necessary in order to cancel out the signal resulting from a slow drift in the coil system due to the tempe...

Parrondo's games present an apparently paradoxical situation where individually losing games can be combined to win. In this article we analyze the case of two coin tossing games. Game B is played with two biased coins and has state-dependent rules based on the player's current capital. Game B can exhibit detailed balance or even negative drift (i.e., loss), depending on the chosen parameters. ...

Classifying non-stationary and imbalanced data streams encompasses two important challenges, namely concept drift and class imbalance. ‘‘Concept drift’’ (or nonstationarity) is changes in the underlying function being learnt, and class imbalance is vast difference between the numbers of instances in different classes of data. Class imbalance is an obstacle for the efficiency of most classifiers...

Population genetics predicts that the balance between natural selection and genetic drift is determined by the population size. Species with large population sizes are predicted to have properties governed mainly by selective forces; whereas species with small population sizes should exhibit features governed by mutational processes alone. This “drift-barrier hypothesis” has been successful in ...

We use the interaction between nulling and subpulse drift to determine the alias order of this drift in PSR B0809+74. We find that the subpulse drift is not aliased but directly reflects the actual motion of the subbeams. The carousel-rotation time must then be over 200 seconds, which is much longer than theoretically