10,948 research outputs found
Telecommunications performance, reforms, and governance
The authors assess the effects of private capital and independent regulatory agencies on telecommunications performance by using cross-country panel data from 1990 to 2003. In general, they find that having independent regulatory agencies positively affects affordability and labor productivity, but negatively affects quality. Having private capital positively affects access, quality, and labor productivity, but negatively affects affordability. However, reform policies affect industrial and developing countries differently in some cases. The authors also find that governance plays an important role as it affects performance and interacts with reform policies.Country Strategy&Performance,Economic Theory&Research,Infrastructure Regulation,ICT Policy and Strategies,Investment and Investment Climate
Telecommunications Reform and Performance – A Global View
Telekommunikation, Regulierung, Reform, Welt, Telecommunications, Regulation, Reform, World
Influence of OH- concentration on the illitization of kaolinite at high pressure
The products of hydrothermal reactions of kaolinite at 300°C and 1000 bars were studied in KOH solutions covering an OH- concentration, [OH-], of 1M to 3.5M. XRD patterns indicated a notable influence of the [OH-] on the reaction. At [OH]≥3M, the only stable phase was muscovite/illite. The content of muscovite/illite was calculated from the analysis of the diagnostic 060 reflections of kaolinite and muscovite/illite. The results showed a linear dependence of kaolinite and muscovite/illite contents with [OH-]. 27Al MAS NMR spectroscopy revealed the formation of small nuclei of K-F zeolite at high [OH-]. Finally, modelling of the 29Si MAS NMR spectra indicated that the Si/Al ratio of the muscovite/illite formed was very close to that of muscovite, at least in the mineral formed at low [OH-]. In good agreement with the XRD data, the quantification of the reaction products by 29Si MAS NMR indicated a linear decrease of the kaolinite content with increasing OH- concentration.Dirección General de Investigación Científica y Técnica CTQ2007-63297Junta de Andalucía P06-FQM-0217
Differentiated bank strategies across the territory: an exploratory analysis
This paper aims to investigate to what extent there is a differentiated regional bank strategy in the Brazilian economy. Based on the Post Keynesian theory of regional liquidity preference (Dow, 1993), the paper analyses consolidate balance sheets of banks’ branches from several Brazilian regions. Through the analysis of some indicators that were built using the data, the article finds evidence for the thesis that the Brazilian Bank System’s strategy is heterogeneous across space. Furthermore, we conclude that this behaviour reinforces existing uneven regional patterns of development of the economy.bank strategy, regional liquidity preference, regional economics, development.
Identification of galaxy cluster substructures with the Caustic method
We investigate the power of the caustic technique for identifying
substructures of galaxy clusters from optical redshift data alone. The caustic
technique is designed to estimate the mass profile of galaxy clusters to radii
well beyond the virial radius, where dynamical equilibrium does not hold. Two
by-products of this technique are the identification of the cluster members and
the identification of the cluster substructures. We test the caustic technique
as a substructure detector on two samples of 150 mock redshift surveys of
clusters; the clusters are extracted from a large cosmological -body
simulation of a CDM model and have masses of and in the two
samples. We limit our analysis to substructures identified in the simulation
with masses larger than . With mock redshift surveys
with 200 galaxies within , (1) the caustic technique recovers \% of the real substructures, and (2) \% of the substructures
identified by the caustic technique correspond to real substructures of the
central cluster, the remaining fraction being low-mass substructures, groups or
substructures of clusters in the surrounding region, or chance alignments of
unrelated galaxies. These encouraging results show that the caustic technique
is a promising approach for investigating the complex dynamics of galaxy
clusters.Comment: 13 pages, 15 figures. Accepted for publication in Ap
Time decay of scaling critical electromagnetic Schr\"odinger flows
We obtain a representation formula for solutions to Schr\"odinger equations
with a class of homogeneous, scaling-critical electromagnetic potentials. As a
consequence, we prove the sharp time decay estimate for
the 3D-inverse square and the 2D-Aharonov-Bohm potentials.Comment: 32 pages, 1 figur
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