2,031 research outputs found
IPO-related organizational change and long-term performance
Mainstream literature on long-term performance of initial public offerings focuses on long-term underperformance. Because underperformance is an anomalous phenomenon, many authors search for explanations based on financial market imperfections. More recently, however, the attention shifts from underperformance to long-term performance in general. This induces the search for other than financial market imperfections in explaining under- or outperformance. This article presents the idea that in many companies the preparation for the IPO and the IPO itself may bring organizational change. It searches for IPO-related organizational change in The Netherlands with interviews of Dutch corporate officers. The research shows that an IPO primarily changes financial management and financial reporting, but that other types of organizational change may also be relevant. Moreover, long-term stock market performance was on average higher in companies where IPO-related organizational changes were reported than in companies where the changes were not reported.
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Long-term predictability of mean daily temperature data
We quantify the long-term predictability of global mean daily temperature data by means of the Rényi entropy of second order K2. We are interested in the yearly amplitude fluctuations of the temperature. Hence, the data are low-pass filtered. The obtained oscillatory signal has a more or less constant frequency, depending on the geographical coordinates, but its amplitude fluctuates irregularly. Our estimate of K2 quantifies the complexity of these amplitude fluctuations. We compare the results obtained for the CRU data set (interpolated measured temperature in the years 1901-2003 with 0.5° resolution, Mitchell et al., 20051) with the ones obtained for the temperature data from a coupled ocean-atmosphere global circulation model (AOGCM, calculated at DKRZ). Furthermore, we compare the results obtained by means of K2 with the linear variance of the temperature data
Persistent currents in n-fold twisted Moebius strips
We investigate the influence of the topology on generic features of the
persistent current in n-fold twisted Moebius strips formed of quasi
one--dimensional mesoscopic rings, both for free electrons and in the weakly
disordered regime. We find that there is no generic difference between the
persistent current for untwisted rings and for Moebius strips with an arbitrary
number of twists.Comment: 7 pages, 2 figure
Asymptotic Capture-Number and Island-Size Distributions for One-Dimensional Irreversible Submonolayer Growth
Using a set of evolution equations [J.G. Amar {\it et al}, Phys. Rev. Lett.
{\bf 86}, 3092 (2001)] for the average gap-size between islands, we calculate
analytically the asymptotic scaled capture-number distribution (CND) for
one-dimensional irreversible submonolayer growth of point islands. The
predicted asymptotic CND is in reasonably good agreement with kinetic
Monte-Carlo (KMC) results and leads to a \textit{non-divergent asymptotic}
scaled island-size distribution (ISD). We then show that a slight modification
of our analytical form leads to an analytic expression for the asymptotic CND
and a resulting asymptotic ISD which are in excellent agreement with KMC
simulations. We also show that in the asymptotic limit the self-averaging
property of the capture zones holds exactly while the asymptotic scaled gap
distribution is equal to the scaled CND.Comment: 4 pages, 1 figure, submitted to Phys. Rev.
Automated Classification of Stellar Spectra: Where Are We Now?
We briefly review the work of the past decade on automated classification of stellar spectra and discuss techniques which show particular promise. Emphasis is placed on Artificial Neural Network and Principle Component Analysis based techniques, due both to our greater familiarity with these and to their rising popularity. As an example of the abilities of current techniques we report on our automated classification work based on the visual classifications of N. Houk (Michigan Spectral Catalogue, Vol. 1 - 4, 1975, 1978, 1982, 1988)
Spin effects in the magneto-drag between double quantum wells
We report on the selectivity to spin in a drag measurement. This selectivity
to spin causes deep minima in the magneto-drag at odd fillingfactors for
matched electron densities at magnetic fields and temperatures at which the
bare spin energy is only one tenth of the temperature. For mismatched densities
the selectivity causes a novel 1/B-periodic oscillation, such that negative
minima in the drag are observed whenever the majority spins at the Fermi
energies of the two-dimensional electron gasses (2DEGs) are anti-parallel, and
positive maxima whenever the majority spins at the Fermi energies are parallel.Comment: 4 pages, 3 figure
Field theoretical approach to non-local interactions: 1d electrons and fermionic impurities
We apply a recently proposed path-integral approach to non-local bosonization
to a Thirring-like system modeling non-relativistic massless particles
interacting with localized fermionic impurities. We consider forward scattering
processes described by symmetric potentials including interactions between
charge, current, spin and spin-current densities. In the general
(spin-flipping) problem we obtain an effective action for the collective modes
of the model at T = 0, containing WZW-type terms. When spin-flipping processes
are disregarded the structure of the action is considerably simplified,
allowing us to derive exact expressions for the dispersion relations of
collective modes and two point fermionic correlation functions as functionals
of the potentials. Finally, as an example, we compute the momentum distribution
for the case in which electrons and impurities are coupled through spin and
spin-current densities only. The formulae we get suggest that our formalism
could be useful in order to seek for a mechanism able to restore Fermi liquid
behavior.Comment: 27 pages, Latex file, no figure
Sign-reversal of drag in bilayer systems with in-plane periodic potential modulation
We develop a theory for describing frictional drag in bilayer systems with
in-plane periodic potential modulations, and use it to investigate the drag
between bilayer systems in which one of the layers is modulated in one
direction. At low temperatures, as the density of carriers in the modulated
layer is changed, we show that the transresistivity component in the direction
of modulation can change its sign. We also give a physical explanation for this
behavior.Comment: 4 pages, 4 figure
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