4,940 research outputs found
A characterization of shortest geodesics on surfaces
Any finite configuration of curves with minimal intersections on a surface is
a configuration of shortest geodesics for some Riemannian metric on the
surface. The metric can be chosen to make the lengths of these geodesics equal
to the number of intersections along them.Comment: Published by Algebraic and Geometric Topology at
http://www.maths.warwick.ac.uk/agt/AGTVol1/agt-1-17.abs.htm
The relative price of non-traded goods under imperfect competition
We consider the role of imperfect competition in explaining the relative price of non-traded to traded goods within the Balassa-Samuelson framework. Under imperfect competition in these two sectors, relative prices depend on both productivity and mark-up differentials. We test this hypothesis using a panel of sectors for 12 OECD countries. The empirical evidence suggests that relative price movements are well explained by productivity and mark-up differentials.This study is partly funded by the Galician government under grants INCITE09201042PR and MTM2008-03010
Constraints on the properties of the turbulent magnetic field around Geminga using HAWC measurements
We place constraints on the properties of the interstellar turbulence that
surrounds Geminga pulsar, using the recent measurements from the HAWC
Observatory in this region. We propagate very-high-energy electrons in
realizations of 3D isotropic Kolmogorov or Kraichnan turbulence, calculate
their gamma-ray emission, and compare with HAWC measurements. We show that the
measurements can be well fitted for both models of the turbulence and for
reasonable values of its strength, , and coherence length, . Our best fits are obtained for G and pc. Furthermore, the absence of strong asymmetries in the observed
emission favours pc.Comment: 6 pages, 3 figures. Submitted to Journal of Physics: Conference
Series. Talk presented at the 26th Extended European Cosmic Ray Symposium,
Barnaul, July 201
An Exploratory Study of Patient Falls
Debate continues between the contribution of education level and clinical expertise in the nursing practice environment. Research suggests a link between Baccalaureate of Science in Nursing (BSN) nurses and positive patient outcomes such as lower mortality, decreased falls, and fewer medication errors. Purpose: To examine if there a negative correlation between patient falls and the level of nurse education at an urban hospital located in Midwest Illinois during the years 2010-2014? Methods: A retrospective crosssectional cohort analysis was conducted using data from the National Database of Nursing Quality Indicators (NDNQI) from the years 2010-2014. Sample: Inpatients aged â„ 18 years who experienced a unintentional sudden descent, with or without injury that resulted in the patient striking the floor or object and occurred on inpatient nursing units. Results: The regression model was constructed with annual patient falls as the dependent variable and formal education and a log transformed variable for percentage of certified nurses as the independent variables. The model overall is a good fit, F (2,22) = 9.014, p = .001, adj. R2 = .40. Conclusion: Annual patient falls will decrease by increasing the number of nurses with baccalaureate degrees and/or certifications from a professional nursing board-governing body
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Investment cost channel and monetary transmission
Copyright @ 2011 Central Bank Review. This article is available open access through the publisherâs website at the link below.We show that a standard DSGE model with investment cost channels has
important model stability and policy implications. Our analysis suggests that in
economies characterized by supply side well as demand side channels of monetary
transmission, policymakers may have to resort to a much more aggressive stand against
inflation to obtain locally unique equilibrium. In such an environment targeting output
gap may cause model instability. We also show that it is difficult to distinguish
between the New Keynesian model and labor cost channel only case, while with
investment cost channel differences are more significant. This result is important as it
suggests that if one does not take into account the investment cost channel, one is
underestimating the importance of supply side effects
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The relative price of non-traded goods under imperfect competition
This article is available open access through the publisherâs website. Copyright @ 2012 The Department of Economics, University of Oxford.We consider the role of imperfect competition in explaining the relative price of non-traded to traded goods within the BalassaâSamuelson framework. Under imperfect competition in these two sectors, relative prices depend on both productivity and mark-up differentials. We test this hypothesis using a panel of sectors for 12 OECD countries. The empirical evidence suggests that relative price movements are well explained by productivity and mark-up differentials.The Galician governmen
Constraining the properties of the magnetic turbulence in the Geminga region using HAWC -ray data
Observations of extended gamma-ray emission around Galactic cosmic-ray (CR)
sources can be used as novel probes of interstellar magnetic fields. Using
very-high-energy gamma-ray data from the HAWC Observatory, we place constraints
on the properties of the magnetic turbulence within pc from
Geminga. We inject and propagate individual CR electrons in 3D realizations of
turbulent magnetic fields, calculate the resulting gamma-ray emission, and
compare with HAWC measurements of this region. We find that HAWC data is
compatible with expectations for Kolmogorov or Kraichnan turbulence, and can be
well fitted for reasonable coherence lengths and strengths of the turbulence,
despite implying a CR diffusion coefficient significantly smaller than those
suggested by Galactic CR propagation codes. The best fit is found for a
coherence length pc and a magnetic field strength G, and the preferred value for increases with
. Moreover, the apparent lack of strong asymmetries in the
observed emission allows us to constrain the coherence length to pc in this region.Comment: submitted to MNRA
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The Relative Price of Non-traded Goods in an Imperfectly Competitive Economy: Empirical Evidence for G7 Countries
In this paper, we consider the role of imperfect competition in explaining the relative price of non-traded to traded goods within the Balassa-Samuelson framework. Under imperfect competition in the two sectors, relative prices depend on both productivity differentials and mark-up differentials. We test this implication using a panel of sectors for the seven major OECD countries. The empirical evidence suggests that relative price movements are well explained by productivity and mark-up differentials. Unlike the original Balassa-Samuelson model, aggregate demand could affect the real exchange rate by changing the mark ups. The empirical results show that aggregate demand fluctuations lead to changes on the mark-ups
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