Search results for "Stability"

Epigenetics and periodontics : a systematic review

2019

Background Despite decades of research, our knowledge of several important aspects of periodontal pathogenesis remains incomplete. Epigenetics allows to perform dynamic analysis of different variations in gene expression, providing this great advantage to the static measurement provided by genetic markers. The aim of this systematic review is to analyze the possible relationships between different epigenetic mechanisms and periodontal diseases, and to assess their potential use as biomarkers of periodontitis. Material and Methods A systematic search was conducted in six databases using MeSH and non-MeSH terms. The review fulfilled PRISMA criteria (Preferred Reporting Items for Systematic re…

Instability of relativistic sheared jets and distinction between FRI and FRII sources

2002

We investigate the shear-driven instability of nonmagnetic relativistic jets with the bulk velocity, V , dependent on the cylindric radius, r. It is shown that instability can arise for any dependence of the velocity (or the Lorentz factor that is the same) on r. The shear-driven instability can e ectively operate in the whole volume of a jet. The growth time can be shorter than that of the Kelvin-Helmholtz instability. The considered instability leads to a turbulization of jets and can account for a distiction between the jets in the FRI and FRII sources. Urpin, V., Vadim.Urpin@uv.es

Toward a wave turbulence formulation of statistical nonlinear optics

2012

International audience; During this last decade, several remarkable phenomena inherent to the nonlinear propagation of incoherent optical waves have been reported in the literature. This article is aimed at providing a generalized wave turbulence kinetic formulation of random nonlinear waves governed by the nonlinear Schrodinger equation in the presence of a nonlocal or a noninstantaneous nonlinear response function. Depending on the amount of nonlocal (noninstantaneous) nonlinear interaction and the amount of inhomogeneous (nonstationary) statistics of the incoherent wave, different types of kinetic equations are obtained. In the spatial domain, when the incoherent wave exhibits fluctuatio…

Role of MR arthrography in shoulder micro-instability: personal experience.

2010

Muscle lesions, a frequent event in sport, often cause hematomas. In fact, both in the traumatic direct injuries, as in American football, and in the traumatic indirect ones, as in strength sports, lesions interesting leg's Muscles Cause intra- and extramuscular hematomas. A diagnosis in a short time, allow LIS to evaluate the lesion rank and plan a surgery approach. Authors present high resolution Ultrasound (HRSU) as a new diagnostic method for this kind of lesion. It allows us to confirm clinic diagnosis, define the lesion's areas and follow-up. Moreover, HRSU has all important role in therapy, promoting in real time the blood's aspiration from lesion's area. Three phases after trauma, d…

The influence of steric effects on the strength of some organic acids in toluene and water

Is an Increase of the Fiscal Budget at EMU level Desirable?

2005

The birth of the European Monetary Union (EMU) has determined the creation of a common currency, the Euro, but unlike other monetary unions, the EMU does not have a central fiscal authority. The role of fiscal policy is left to the responsibility of the governments of the EMU member States. The new architecture modifies the assignment of the instruments to the objectives, especially those of stabilization. The loss of the sovereignty of monetary policy and exchange rate control by the individual member states has determined the inability to use two important instruments of insurance against the risks of shocks. Moreover, the Treaty of Maastricht and the Stability and Growth Pact (SGP) could…

Income inequality, fiscal stimuli and political (in)stability

2016

Using data for a large panel of countries, this paper investigates the role played by income inequality and fiscal stimuli episodes in shaping the likelihood of political stability. By means of Tobit estimations, we show that a rise in inequality increases the probability of government crises. However, such adverse distributional effect is reduced when expansionary or increasingly expansionary fiscal stimuli episodes or successful fiscal stimuli programs are put in place.

The Determinants of the Volatility of Fiscal Policy Discretion

2014

We investigate the determinants of the volatility of fiscal policy discretion. Using a linear dynamic panel dataset model for 104 countries from 1980 to 2006 and a system-GMM estimator,we find that more government instability, less democracy and presidentialist systems increase the volatility of the discretionary component of fiscal policy. Additionally, we show that countries with a larger size, a smaller degree of financial openness, and a stable exchange rate system are more insured against the uncertainty about the conduct of fiscal policy. Our results are robust to various regional dummy variables, diferent sub-sets of countries and the presence of high inflation and crisis episodes.

Automatic stabilizers, fiscal rules and macroeconomic stability

2006

This paper analyzes the effect of the fiscal structure upon the trade-off between inflation and output stabilization in the presence of technological shocks in a DGE model with nominal and real rigidities. The model reproduces the main features of European economies and it integrates a rich menu of fiscal variables as well as a target on the debt to output ratio. The main result of this paper is that distortionary taxes tend to increase output volatility relative to lump-sum taxes unless substantial rigidities are present. We explore in detail the mechanisms that generate such a result, and the conditions under which the supply-side effects of distortionary taxes and the procyclical behavio…

The Economic Rationale of Fiscal Rules in OCAs: The Stability and Growth Pact and the Excessive Deficit Procedure

2013

This chapter examines the case of different regions within a single country that wish to share a common currency, even though they have divergent trends in unemployment, inflation, wages, non-wage costs and productivity. This situation compares with the case of a group of EU countries, each with its own decentralised national budget, that have established a monetary union and that are facing asymmetric shocks. As such an economic context requires fiscal commitments from national governments, we analyse the economic rationale of setting fiscal rules for a common currency area and the resulting EU institutional frame for the Stability and Growth Pact (SGP) and the Excessive Deficit Procedure …