6,333 research outputs found
Cross Recurrence Plot Based Synchronization of Time Series
The method of recurrence plots is extended to the cross recurrence plots
(CRP), which among others enables the study of synchronization or time
differences in two time series. This is emphasized in a distorted main diagonal
in the cross recurrence plot, the line of synchronization (LOS). A
non-parametrical fit of this LOS can be used to rescale the time axis of the
two data series (whereby one of it is e.g. compressed or stretched) so that
they are synchronized. An application of this method to geophysical sediment
core data illustrates its suitability for real data. The rock magnetic data of
two different sediment cores from the Makarov Basin can be adjusted to each
other by using this method, so that they are comparable.Comment: Nonlinear Processes in Geophysics, 9, 2002, in pres
Accurate Prediction of the Ammonia Probes of a Variable Proton-to-Electron Mass Ratio
A comprehensive study of the mass sensitivity of the
vibration-rotation-inversion transitions of NH, NH,
ND, and ND is carried out variationally using the TROVE
approach. Variational calculations are robust and accurate, offering a new way
to compute sensitivity coefficients. Particular attention is paid to the
transitions between the accidentally coinciding
rotation-inversion energy levels of the and states,
and the inversion transitions in the state affected by the "giant"
-type doubling effect. These transitions exhibit highly anomalous
sensitivities, thus appearing as promising probes of a possible cosmological
variation of the proton-to-electron mass ratio . Moreover, a simultaneous
comparison of the calculated sensitivities reveals a sizeable isotopic
dependence which could aid an exclusive ammonia detection.Comment: 18 pages, 2 figures, 10 table
How to avoid potential pitfalls in recurrence plot based data analysis
Recurrence plots and recurrence quantification analysis have become popular
in the last two decades. Recurrence based methods have on the one hand a deep
foundation in the theory of dynamical systems and are on the other hand
powerful tools for the investigation of a variety of problems. The increasing
interest encompasses the growing risk of misuse and uncritical application of
these methods. Therefore, we point out potential problems and pitfalls related
to different aspects of the application of recurrence plots and recurrence
quantification analysis
De zakelijke overheid: publieke en bedrijfsmatige waarden in publiek-private samenwerking
Bedrijfsmatig werken bij de overheid is steeds
meer in opmars. Tal van werkwijzen en technieken
uit het bedrijfsleven worden overgenomen en
ingevoerd. Volgens Jane Jacobs is er echter sprake
van twee fundamenteel onverenigbare ethische
stelsels. Het commerciële ethos omvat alle normen
en waarden uit het bedrijfsleven. Winst en de
superioriteit van het marktmechanisme staan hierin
centraal. Het martiale ethos omvat alle normen en
waarden die betrekking hebben op de taken van de
overheid. Zou de overheid bedrijfsmatig kunnen
zijn of worden? Volgens Jacobs zijn beide stelsels
moeilijk tot niet te verenigen. Een bedrijfsmatige
overheid brengt altijd het risico van een
waardeconflict met zich mee. Hoe zakelijk kan de
overheid dan wel opereren? Wij onderzochten dat
bij een aantal projecten waar overheden en
bedrijven samen verantwoordelijk waren voor een
bouwproject of infrastructurele voorziening (PPS).
Aan de hand van onze omschrijving van de zakelijke
overheid zijn aan een aantal experts vragen
voorgelegd met betrekking tot enkele concrete
samenwerkingsverbanden. Op basis van de
bevindingen kunnen we concluderen dat de overheid
zich binnen de grenzen van het martiale ethos
redelijk zakelijk gedraagt. Er zou wel meer
aandacht moeten worden besteed aan de efficiëntie
van projecten alsmede aan de selectieprocedures
van de marktpartijen
Study in optimization of microcircuit design Final report
Optimization of microcircuit reliabilit
How are rescaled range analyses affected by different memory and distributional properties? A Monte Carlo study
In this paper, we present the results of Monte Carlo simulations for two
popular techniques of long-range correlations detection - classical and
modified rescaled range analyses. A focus is put on an effect of different
distributional properties on an ability of the methods to efficiently
distinguish between short and long-term memory. To do so, we analyze the
behavior of the estimators for independent, short-range dependent, and
long-range dependent processes with innovations from 8 different distributions.
We find that apart from a combination of very high levels of kurtosis and
skewness, both estimators are quite robust to distributional properties.
Importantly, we show that R/S is biased upwards (yet not strongly) for
short-range dependent processes, while M-R/S is strongly biased downwards for
long-range dependent processes regardless of the distribution of innovations.Comment: 15 pages, 6 table
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