نتایج جستجو برای: qz factoriation
تعداد نتایج: 359 فیلتر نتایج به سال:
Dust acoustic waves (DAW) are spontaneously excited in dusty plasmas produced in dc and rf discharge plasmas over a wide range of plasma and dust conditions. A common feature of these plasmas is the presence of an ion drift relative to the dust, which is driven by an electric field, Eo in the discharge. Using a three fluid model of the DAWs, including the zero order electric field and collision...
The BBGKY hierarchy is used to derive a generalization of the Lenard-Balescu plasma kinetic equation that accounts for wave-particle scattering due to instabilities that originate from discrete particle motion. Application to convective instabilities is emphasized for which the growing waves either propagate out of the domain of interest or modify the particle distribution to reduce the instabi...
Abstract. Zero-sum problems on abelian groups, subset sums in a field and covers of the integers by residue classes, are three different active topics initiated by P. Erdős more than 40 years ago and investigated by many researchers separately since then. In an earlier announcement [Electron. Res. Announc. Amer. Math. Soc. 9(2003), 51-60], the author claimed some connections among these seeming...
Abstract. Zero-sum problems on abelian groups, subset sums in a field and covers of the integers by residue classes, are three different active topics initiated by P. Erdős and investigated by many researchers. In an earlier paper [Electron. Res. Announc. Amer. Math. Soc. 9(2003), 51-60], the author announced some connections among these seemingly unrelated fascinating areas. In this paper we e...
Four new dipeptidyl nikkomycins of the Z- and the X-series with a variation in the amino acid moiety of the molecule were isolated from the mutant Streptomyces tendae 901/395 and characterized. Nikkomycins Kz and Kx contain 2-amino-4-hydroxy-4-(2-pyridyl)butyric acid, and nikkomycins Oz and Ox 2-amino-4-hydroxy-4-(5-hydroxy-2-pyridyl)butyric acid. In contrast to nikkomycins Z and X, nikkomycins...
The sum-product phenomenon predicts that a finite set A in a ring R should have either a large sumset A + A or large product set A ·A unless it is in some sense “close” to a finite subring of R. This phenomenon has been analysed intensively for various specific rings, notably the reals R and cyclic groups Z/qZ. In this paper we consider the problem in arbitrary rings R, which need not be commut...
The Jacobi-Davidson subspace iteration method ooers possibilities for solving a variety of eigen-problems. In practice one has to apply restarts because of memory limitations, in order to restrict computational overhead, and also if one wants to compute several eigenvalues. In general, restarting has negative eeects on the convergence of subspace methods. We will show how eeective restarts can ...
Context. In the Gaia era, precision of astrometric data is unprecedented. High-quality make it easier to find more cluster aggregates and gather further confirmation these open clusters. Aims. We use Data Release 3 (DR3) redetermine clusters surrounding Pismis 5 in Vela molecular ridge (VMR). also investigate basic properties Methods. applied two clustering algorithms (S TAR GO pyUPMASK) identi...
Various theories and numerical simulations support the conjecture that the ubiquitous problem of anomalous electron transport in tokamaks may arise from an electron gyro-scale turbulence driven by the electron temperature gradient. To check whether such turbulence is present in plasmas of the National Spherical Torus Experiment (NSTX), measurements of turbulent fluctuations were performed with ...
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