Search results for "RAV"

Relevance of trade facilitation in emerging countries exports

2012

The objective of this article is to analyse trade flows in emerging nations with a maritime boundary, where trade facilitation plays a decisive role in their international development. In order to detect possible patterns in performance, we apply the economic approach of gravity models using the World Bank Logistic Performance Index (LPI) as a good proxy of trade facilitation. The results of the estimation lead to the conclusion that the more complex the transportation of goods is, the more influential the logistics indicator, trade facilitation being most prominent in Middle East exporters.

Pull factors for university students’ mobility: a gravity model approach

2020

Migration phenomena are characterised by flows that are typically multilateral. Often an outgoing flow corresponds to one or more incoming flows, which counterbalances it. When the balance is negative, socio-economic problems can arise. Italy has been afflicted for years by a particular type of unilateral migration: student mobility. Thousands of students leave the South to study in the Centre-North, driven by the better socio-economic conditions of those areas, and by more prosperous job prospects. Since this flow is not followed by a return one, nor by other incoming flows, the historical, socio-economic gap between North and South is widened. Taking advantage of the big dataset concernin…

The internationalisation of the Spanish food industry: the home market effect and European market integration

2015

<p>The objective of this study was to analyse, from a long-term perspective, the factors determining the process of the internationalisation of the Spanish agrifood industry. The paper concentrates on the empirical verification of the existence of a home market effect in the food and drink industries in Spain and on the effects on trade flows of integration into the European Union. With this aim in mind, we took into account the latest contributions to the estimation of the gravity equation for a sample of export flows from 13 agrifood subsectors between 1970 and 2012, with a destination of 175 markets. From the results of the study the existence of the “home market effect” stands out…

Currency unions and trade : what is the impact of the euro on trade in the euro area?

2012

The aim of this study is to estimate the effect of the euro on trade within the euro area. This has been a relevant question for European politicians ever since the launch of the common currency was agreed on in the Maastricht Treaty in 1992. To analyse the topic the gravity model of international trade augmented with several dummy variables is employed using panel data of 29 developed countries between 1995 and 2010. The estimated aggregate trade effect on the euro zone reaches 10 % in the most preferred regression and is comparable with earlier estimates. However, there is considerable variation in the results when different sample sizes are used. This could be a sign of omitted variable …

Estimer des flux de navetteurs avec un modèle gravitaire

2019

Dans ce poster, nous présentons le modèle gravitaire sous différents modèles en mettant en évidence les effets de distance et les occasions interposées. Le modèle généralisé de Newton est utilisé et donne des estimations relativement correctes des flux intercommunaux en région PACA.

Gravitācijas mērījumu izmantošana aprakto ieleju lokalizēšanā

2017

Bakalaura darbā “Gravitācijas mērījumu izmantošana aprakto ieleju lokalizēšanā” tiek izvērtēta gravimetrijas metodes pielietošana aprakto ieleju atrašanās vietu un īpašību noskaidrošanā. Pētījuma mērķis ir apzināt gravitācijas lauka pētījumu metodes pielietošanas iespējas aprakto ieleju meklēšanā. Pētījumā veikts 1986. gada gravimetriskās kartēšanas datu pārinterpretācija, no kuras izdarīti secinājumi par aprakto ieleju atrašanās vietu Valmieras-Staiceles apkārtnē. Pētījuma otrajā daļā veikta lauka gravimetrijas profila uzmērīšana pār vienu no izdalītajām apraktajām ielejām. Pētījumā secināts, ka apskatītajā teritorijā ir konstatējamas ar apraktajām ielejām saistīta gravitācijas anomālijas.…

Comparison between the MHFEM formulation and a 2nd spatial order FV formulation of the linear ground problem

2008

Comparison of different 2nd order formulations for the solution of the 2D groundwater flow problem over irregular triangular meshes

2009

Mixed and Mixed Hybrid Finite Elements (MHFE) methods have been widely used in the last decade for simulation of groundwater flow problem, petroleum reservoir problems, potential flow problems, etc. The main advantage of these methods is that, unlike the classical Galerkin approach, they guarantee local and global mass balance, as well the flux continuity between inter-element sides. The simple shape of the control volume, where the mass conservation is satisfied, makes also easier to couple this technique with a Finite Volume technique in the time splitting approach for the solution of advection-dispersion problems. In the present paper, a new MHFE formulation is proposed for the solution …

Cross-Frequency Coupling in Developmental Perspective

2019

It is generally assumed that different electroencephalogram (EEG) frequency bands are somehow related to different computational modes in the brain. Integration of these computational modes is reflected in the phenomenon of cross-frequency coupling (CFC). On slow temporal scales, CFC may reflect trait-like properties, which posits a question of its developmental trends. This is the first study that explored source-level CFC measures in a developmental perspective using both cross-sectional and longitudinal designs. CFC measures demonstrated good test-retest stability and proved to be higher in adults in cortical areas participating in sensory-motor integration, response inhibition, and atte…

Citronellal and citronellol as growth inhibitors of freshwater cyanobacteria

2014

Cyanobacteria possess a very high tolerance relative to environmental factors, so they can be found in almost every aquatic habitat: oceans, freshwaters, hot springs, soils and bare rocks. Nowadays these microorganisms are thought to cause the formation of intensive blooms which result from water eutrophication. In order to suppress blooms in aquatic ecosystems, it is important to limit the growth of blue-green algae, preferably using environment-friendly procedures. In this article we present how two aliphatic, natural monoterpenes: citronellal and citronellol, influence the growth of cyanobacteria. Three species of freshwater cyanobacteria: Anabaena sp., Nodularia moravica and Chroococcus…