@article{HuppertBlasiusOlinkyetal.2005,
  author    = {Huppert, Amit and Blasius, Bernd and Olinky, Ronen and Stone, Lewi},
  title     = {A Model for Seasonal Phytoplankton Blooms},
  year      = {2005},
  abstract  = {We analyse a generic bottom-up nutrient phytoplankton model to help understand the dynamics of seasonally recurring algae blooms. The deterministic model displays a wide spectrum of dynamical behaviours, from simple cyclical blooms which trigger annually, to irregular chaotic blooms in which both the time between outbreaks and their magnitudes are erratic. Unusually, despite the persistent seasonal forcing, it is extremely difficult to generate blooms that are both annually recurring and also chaotic or irregular (i.e. in amplitude) even though this characterizes many real time series. Instead the model has a tendency to `skip' with outbreaks often being suppressed from one year to the next. This behaviour is studied in detail and we develop an analytical expression to describe the model's flow in phase space, yielding insights into the mechanism of the bloom recurrence. We also discuss how modifications to the equations through the inclusion of appropriate functional forms can generate more realistic dynamics.},
  language  = {en}
}
@article{LangMellinger2005,
  author    = {Lang, Sidney B. and Mellinger, Axel},
  title     = {A package of Mathematica programs for training students in the use of LIMM and its analysis},
  year      = {2005},
  abstract  = {A package of programs written using the symbolic mathematics program, Mathematicatrademark, has been developed. Its principal usage is in teaching the LIMM method to students and demonstrating data analysis by means of the Polynomial Regularization Method (PRM). A large number of variables can be changed in the program and their effects can be shown graphically. Students at the University of Potsdam and Monash University have used the program successfully},
  language  = {en}
}
@article{CironeNegrettiCalarcoetal.2005,
  author    = {Cirone, M. A. and Negretti, Antonio and Calarco, T. and Kr{\"u}ger, P. and Schmiedmayer, J{\"o}rg},
  title     = {A simple quantum gate with atom chips},
  year      = {2005},
  abstract  = {We present a simple scheme for implementing an atomic phase gate using two degrees of freedom for each atom and discuss its realization with cold rubidium atoms on atom chips. We investigate the performance of this collisional phase gate and show that gate operations with high fidelity can be realized in magnetic traps that are currently available on atom chips},
  language  = {en}
}
@article{ColinCorbettDurtetal.2005,
  author    = {Colin, S and Corbett, J and Durt, T and Gross, David},
  title     = {About SICPOVMs and discrete Wigner distributions},
  year      = {2005},
  abstract  = {A set of d(2) vectors in a Hilbert space of dimension d is called equiangular if each pair of vectors encloses the same angle. The projection operators onto these vectors define a POVM which is distinguished by its high degree of symmetry. Measures of this kind are called symmetric informationally complete, or SIC POVMs for short, and could be applied for quantum state tomography. Despite its simple geometrical description, the problem of constructing SIC POVMs or even proving their existence seems to be very hard. It is our purpose to introduce two applications of discrete Wigner functions to the analysis of the problem at hand. First, we will present a method for identifying symmetries of SIC POVMs under Clifford operations. This constitutes an alternative approach to a structure described before by Zauner and Appleby. Further, a simple and geometrically motivated construction for an SIC POVM in dimensions two and three is given (which, unfortunately, allows no generalization). Even though no new structures are found, we hope that the re- formulation of the problem may prove useful for future inquiries},
  language  = {en}
}
@article{ChristensenSchulteLadbeckSanchezetal.2005,
  author    = {Christensen, Lise Bech and Schulte-Ladbeck, R. E. and Sanchez, Sebastian F. and Becker, Thomas and Jahnke, Knud and Kelz, A. and Roth, Martin M. and Wisotzki, Lutz},
  title     = {Abundances and kinematics of a candidate sub-damped Lymana galaxy toward PHL 1226},
  year      = {2005},
  abstract  = {The spectrum of the quasar PHL 1226 is known to have a strong Mg II and sub-damped Lymanalpha (sub-DLA) absorption line system with N(H I) = (5 +/- 2) x 10(19) cm(-2) at z = 0.1602. Using integral field spectra from the Potsdam Multi Aperture Spectrophotometer (PMAS) we investigate a galaxy at an impact parameter of 6".4 which is most probably responsible for the absorption lines. A fainter galaxy at a similar redshift and a slightly larger distance from the QSO is known to exist, but we assume that the absorption is caused by the more nearby galaxy. From optical Balmer lines we estimate an intrinsic reddening consistent with 0, and a moderate star formation rate of 0.5 M-circle dot yr(-1) is inferred from the Ha luminosity. Using nebular emission line ratios we find a solar oxygen abundance 12 + log (O/H) = 8.7 +/- 0.1 and a solar nitrogen to oxygen abundance ratio log (N/O) = -1.0 +/- 0.2. This abundance is larger than those of all known sub-DLA systems derived from analyses of metal absorption lines in quasar spectra. On the other hand, the properties are compatible with the most metal rich galaxies responsible for strong Mg II absorption systems. These two categories can be reconciled if we assume an abundance gradient similar to local galaxies. Under that assumption we predict abundances 12 + log (O/H) = 7.1 and log (N/O) = -1.9 for the sub-DLA cloud, which is similar to high redshift DLA and sub-DLA systems. We find evidence for a rotational velocity of similar to200 km s(-1) over a length of similar to7 kpc. From the geometry and kinematics of the galaxy we estimate that the absorbing cloud does not belong to a rotating disk, but could originate in a rotating halo},
  language  = {en}
}
@article{KappeOstermeyerMenzel2005,
  author    = {Kappe, Philip and Ostermeyer, Martin and Menzel, Ralf},
  title     = {Active mode locking of a phase-conjugating SBS-laser oscillator},
  issn      = {0946-2171},
  year      = {2005},
  abstract  = {We present a flashlamp-pumped Nd: YAG laser simultaneously emitting pulse structures on microsecond, nanosecond and picosecond time scales. Within a microsecond flashlamp pump pulse a nonlinear reflector based on stimulated Brillouin scattering (SBS) generates several Q-switch pulses. The phase-conjugating effect of the SBS reflector provides a compensation of phase distortions generated inside the laser rod, resulting in transverse fundamental mode operation. Additional acousto-optic loss modulation inside the resonator leads to mode locking. As a result, each Q-switch pulse is subdivided into several picosecond pulses. Energies of up to 2 mJ for the mode-locked pulses with durations between 220 and 800 ps are demonstrated. The wide variability of the laser's temporal output parameters as well as its high beam quality make it a splendid tool for fundamental research in laser materials processing},
  language  = {en}
}
@article{KappeOstermeyerMenzel2005,
  author    = {Kappe, Philip and Ostermeyer, Martin and Menzel, Ralf},
  title     = {Active mode locking of a phase-conjugating SBS-laser oscillator},
  issn      = {0946-2171},
  year      = {2005},
  language  = {en}
}
@article{AbelAhnertKurthsetal.2005,
  author    = {Abel, Markus and Ahnert, Karsten and Kurths, R. and Mandelj, S.},
  title     = {Additive nonparametric reconstruction of dynamical systems from time series},
  issn      = {1063-651X},
  year      = {2005},
  abstract  = {We present a nonparametric way to retrieve an additive system of differential equations in embedding space from a single time series. These equations can be treated with dynamical systems theory and allow for long-term predictions. We apply our method to a modified chaotic Chua oscillator in order to demonstrate its potential},
  language  = {en}
}
@article{ZollerHainzlHolschneideretal.2005,
  author    = {Zoller, Gert and Hainzl, Sebastian and Holschneider, Matthias and Ben-Zion, Yehuda},
  title     = {Aftershocks resulting from creeping sections in a heterogeneous fault},
  issn      = {0094-8276},
  year      = {2005},
  abstract  = {We show that realistic aftershock sequences with space-time characteristics compatible with observations are generated by a model consisting of brittle fault segments separated by creeping zones. The dynamics of the brittle regions is governed by static/kinetic friction, 3D elastic stress transfer and small creep deformation. The creeping parts are characterized by high ongoing creep velocities. These regions store stress during earthquake failures and then release it in the interseismic periods. The resulting postseismic deformation leads to aftershock sequences following the modified Omori law. The ratio of creep coefficients in the brittle and creeping sections determines the duration of the postseismic transients and the exponent p of the modified Omori law},
  language  = {en}
}
@article{Blasius2005,
  author    = {Blasius, Bernd},
  title     = {Anomalous phase synchronization in two asymmetrically coupled oscillators in the presence of noise},
  year      = {2005},
  abstract  = {We study the route to synchronization in two noisy, nonisochronous oscillators. Anomalous phase synchronization arises if both oscillators differ in their respective value of nonisochronicity and it is characterized by a strong detuning of the oscillator frequencies with the onset of coupling. Here we show that anomalous synchronization, both in limit-cycle or chaotic oscillators, can considerably be enlarged under the influence of asymmetrical coupling and noise. In these systems we describe a number of noise induced effects, such as an inversion of the natural frequency difference and coupling induced desynchronization of two identical oscillators. Our results can be explained in terms of a noisy particle in a tilted washboard potential},
  language  = {en}
}