Search results for "Stability diagram"
showing 3 items of 3 documents
Observation of instabilities in a Paul trap with higher-order anharmonicities
1995
Systematic measurements of the relative ion number stored in a Paul trap within the stability diagram given by the solution of the equation of motion reveal many lines, where only few or no ions can be confined. The observations can be explained by the presence of perturbations from higher-order components in the trapping potential, which is a quadrupole potential in the ideal case. The resonances follow the equation (nr/2)βr + (nr/2)βz = 1,nr +nz =N, where 2N is the order of the perturbation,nr,nz are integer andβr,βz are stability parameters of the trap. The experiments were performed on H+ and H2+ ions, which are detected after a storage time of 0.3 s by ejection from the trap.
Phasenumwandlungen in Korrosionsschichten auf Eisen: Mößbauerspektroskopische Untersuchungen
1981
Zur Untersuchung der Korrosion von Stahlblechen wurde die mosbauerspektroskopische Phasenanalyse in Transmissions- und Streugeometrie eingesetzt. Die Korrosion von Stahlblechen fuhrt in einer Atmosphare von geringer Korrosivitat nach langen Expositionszeiten vorwiegend zu den relativ stabilen β-Phasen der moglichen Fe-Korrosionsprodukte. Bei durch HCl-Zusatz erhohter Korrosivitat ergibt sich eine Bevorzugung der Bildung von β-FeOOH und kein Auftreten der α-Phasen. Auch der Einflus von. Beschichtungen auf die Phasenzusammensetzung wird behandelt. Die Entstehung und Umwandlung der verschiedenen Fe-haltigen Phasen im Rost last sich anhand eines Stabilitatsdiagramms verstehen. Auch die Wirkung …
Labyrinthine instability of miscible magnetic fluids
2002
Abstract We consider an inhomogeneous magnetic fluid (MF), modeling a miscible MF pair, in a Hele–Shaw cell under a normal field. A linear stability analysis for the sharp straight interface (analytically) and for the diffused one (numerically) is performed. For the former case, the neutral curves and the stability diagram are found along with the critical wavelength and parameter values. Oscillatory or monotonous instabilities are shown to occur. For the diffused interface, we recognize the importance of 2D flow viscous effects along with the conventional wall friction and observe that in strong fields the dominant wavelength scales as the cell gap.