8,919 research outputs found
The Economics of Regional Demarcation in Banking
Cooperation among savings and cooperative banks was criticized by the European Commission because of potentially anti-competitive effects. In an industrial economics model of banks taking deposits and giving loans we look at regional demarcation as one of such cooperative practices. There are two adjacent markets with one savings or cooperative bank being focused on each one and one private commercial bank serving both. We find that abolishing regional demarcation indeed increases total loan volume. Savings or cooperative banks always improve market performance and do better without regional demarcation which shields the private commercial bank from aggressive competition by these banks.banking, competition, cooperation, non-profit firms
The Economics of Regional Demarcation in Banking
Cooperation among savings and cooperative banks was criticized by the European Commission because of potentially anti-competitive effects. In an industrial economics model of banks taking deposits and giving loans we look at regional demarcation as one of such cooperative practices. There are two adjacent markets with one savings or cooperative bank being focused on each one and one private commercial bank serving both. We find that abolishing regional demarcation indeed increases total loan volume. Savings or cooperative banks always improve market performance and do better without regional demarcation which shields the private commercial bank from aggressive competition by these banks.banking, competition, cooperation, non-profit firms
Dipole oscillations of confined lattice bosons in one dimension
We study the dynamics of a non-integrable system comprising interacting cold
bosons trapped in an optical lattice in one-dimension by means of exact
time-dependent numerical DMRG techniques. Particles are confined by a parabolic
potential, and dipole oscillations are induced by displacing the trap center of
a few lattice sites. Depending on the system parameters this motion can vary
from undamped to overdamped. We study the dipole oscillations as a function of
the lattice displacement, the particle density and the strength of
interparticle interactions. These results explain the recent experiment C.D.
Fertig et al., Phys. Rev. Lett. 94, 120403 (2005).Comment: 4 pages, 3 figure
The absolute continuity of the integrated density of states for magnetic Schr\"odinger operators with certain unbounded random potentials
The object of the present study is the integrated density of states of a
quantum particle in multi-dimensional Euclidean space which is characterized by
a Schr{\"o}dinger operator with magnetic field and a random potential which may
be unbounded from above and below. In case that the magnetic field is constant
and the random potential is ergodic and admits a so-called one-parameter
decomposition, we prove the absolute continuity of the integrated density of
states and provide explicit upper bounds on its derivative, the density of
states. This local Lipschitz continuity of the integrated density of states is
derived by establishing a Wegner estimate for finite-volume Schr\"odinger
operators which holds for rather general magnetic fields and different boundary
conditions. Examples of random potentials to which the results apply are
certain alloy-type and Gaussian random potentials. Besides we show a
diamagnetic inequality for Schr\"odinger operators with Neumann boundary
conditions.Comment: This paper will appear in "Communications in Mathematical Physics".
It is a revised version of the second part of the first version of
math-ph/0010013, which in its second version only contains the (revised)
first par
Excitonic spectral features in strongly-coupled organic polaritons
Starting from a microscopic model, we investigate the optical spectra of
molecules in strongly-coupled organic microcavities examining how they might
self-consistently adapt their coupling to light. We consider both rotational
and vibrational degrees of freedom, focusing on features which can be seen in
the peak in the center of the spectrum at the bare excitonic frequency. In both
cases we find that the matter-light coupling can lead to a self-consistent
change of the molecular states, with consequent temperature-dependent
signatures in the absorption spectrum. However, for typical parameters, these
effects are much too weak to explain recent measurements. We show that another
mechanism which naturally arises from our model of vibrationally dressed
polaritons has the right magnitude and temperature dependence to be at the
origin of the observed data.Comment: 14 pages, 6 figur
Intrinsic structural disorder in cytoskeletal proteins.
Cytoskeleton, the internal scaffold of the cell, displays an exceptional combination of stability and dynamics. It is composed of three major filamentous networks, microfilaments (actin filaments), intermediate filaments (neurofilaments), and microtubules. Together, they ensure the physical and structural stability of the cell, whereby also mediating its large-scale structural rearrangements, motility, stress response, division, and internal transport. All three cytoskeletal systems are built upon the same basic design: they have a central repetitive scaffold assembled from folded building elements, surrounded and regulated by accessory regions/proteins that regulate its formation and mediate its countless interactions with its environment, serving to send regulatory signals to and from the cytoskeleton. Here, we elaborate on the idea that the opposing features of stability and dynamics are also manifest in the dichotomy of the structural status of its components, the core being highly structured and the accessory proteins/regions being highly disordered, and are responsible for most of the regulatory (post-translational) input promoting adaptive responses and providing dynamics necessary for each of the cytoskeletal systems. This pattern entails special consequences, in which the manifold functional advantages of structural disorder, most pronounced in regulatory and signaling functions, are all exploited by nature. (c) 2013 Wiley Periodicals, Inc
- …