Search results for " Direct"
showing 10 items of 943 documents
Spatio-temporal Contrast Sensitivity in the Cardinal Directions of the Colour Space. A Review
2010
AbstractWe review the psychophysics of the spatio-temporal contrast sensitivity in the cardinal directions of the colour space and their correlation with those neural characteristics of the visual system that limit the ability to perform contrast detection or pattern-resolution tasks. We focus our attention particularly on the influence of luminance level, spatial extent and spatial location of the stimuli - factors that determine the characteristics of the physiological mechanisms underlying detection. Optical factors do obviously play a role, but we will refer to them only briefly. Contrast sensitivity measurements are often used in clinical practice as a method to detect, at their early …
Joint Methodology for the Identification and Assessment of Groundwater Dependent Terrestrial Ecosystems in Estonia and Latvia
2020
Dynamic interactions between ground- and surface water are widely known, but the role of groundwater in terrestrial and aquatic ecosystems is often poorly understood and documented due to the spatiotemporal complexity. Many countries have not yet completed the assessment of groundwater dependent ecosystems (GDEs). GDEs are valuable ecosystems that depend on groundwater input and can not be considered and assessed separately. Changes in the quantity and chemical composition of groundwater recharge may result in significant and permanent damage on GDE flora and fauna. Aquifers are dynamic systems which are not subject to administrative boundaries and borders, therefore should be managed in cl…
Spatial and temporal variability of diatom and macroinvertebrate communities: How representative are ecological classifications within a river system?
2012
Evaluation of river condition is complicated by dynamic relationships between river assemblages and their environment. We assessed variation of ecological status classifications of stream diatom and macroinvertebrate communities within a boreal river system. We specifically examined whether results of ecological classifications are concordant across taxonomic groups and among main channel and headwater side tributaries of this river system. We further assessed whether ecological classifications are stable from year to year and whether classifications show predictable relationships to major stressor gradients. The estimated ecological condition varied considerably among and between reaches o…
Geometric and morphologic evolution of normal fault planes and traces from 2D to 4D data
2003
Abstract The detailed 3D geometry of normal fault planes is described and analysed using datasets from outcrop studies (2D), seismic surveys (3D) and analogue models (4D). Different geometric configurations of simple isolated normal faults are studied by reference to processes of normal fault propagation. When a normal fault propagates without interacting with other fault zones, the entire border of the principal plane displays characteristic connected secondary structures. These secondary structures cause bifurcations of the principal fault terminations. The along-strike terminations of the principal plane display typical bifurcation configurations (‘ear geometry‘). The orientation of the …
Response of macrophyte communities and status metrics to natural gradients and land use in boreal lakes
2012
Abstract We studied the relations of aquatic macrophyte communities, ecological quality metrics and water quality to lake characteristics and to land use defined at multiple spatial scales (three lake marginal zones (LMZs) of contrasting width and the whole topographic catchment) in 110 boreal lakes in Finland using ordination and generalised additive modelling. Variation in macrophyte community composition of our lakes was related to water quality, land use, latitude and lake morphology. Relationships of macrophyte status metrics – the proportion of type-specific species (TT50), Percent Model Affinity (PMA) and Trophic Index (TI) – to land use were scale dependent. The proportion of agricu…
Model uncertainty and variable selection: an application to the modelization of FDI determinants in Europe
2019
Las últimas décadas han visto un interés cada vez mayor en la IED, y un debate creciente sobre su modelización en términos de las variables consideradas como sus determinantes, la especificación del modelo y los métodos de estimación del modelo de gravedad de la IED. Esto se debe a la incertidumbre que rodea tanto las teorías como los enfoques empíricos de la IED. Esta Tesis doctoral tiene como objetivo contribuir a la literatura mediante la investigación de las fuerzas impulsoras de las actividades de las EMNs hacia y desde los países europeos, tanto a nivel regional como nacional, abordando los problemas de selección de variables e incertidumbre del modelo que se enfrentan al modelizar la…
Evolución post-trasplante hepático de los pacientes con cirrosis por VHC y coinfectados por VIH. Comparación con pacientes monoinfectados por VHC
2020
La infección por el virus de la inmunodeficiencia humana (VIH) ha experimentado progresos importantes en las últimas décadas gracias a la aparición de terapias antirretrovirales potentes y eficaces, lo que ha permitido controlar el desarrollo de infecciones oportunistas y aumentar la supervivencia de estos pacientes. Así, las enfermedades hepáticas son una de las causas principales de morbimortalidad en los pacientes VIH, que frecuentemente presentan confección con virus hepatotropos como el virus de la hepatitis B (VHB) y el virus de la hepatitis C (VHC). La causa más frecuente de enfermedad hepática en pacientes VIH en nuestro medio es la confección con el VHC, que además presenta un curs…
Teolingvistika dwadcatʹ let spustâ
2020
At the turn of the 20th and 21st centuries intensive research was conducted at the intersection of two sciences: theology and linguistics, which gave scientists the opportunity to raise the question of the possibility of allocating theolinguistics in the linguistics section. At the beginning, there were discussions and debates about the very term “theolinguistics”, its definitions, directions, methods of research in theolinguistics, and the status of theolinguistics as a scientific discipline. The present article attempts to briefly present the twenty-year history of theolinguistics of the 21st century.The paper also describes the main directions of research and draws attention to the role …
The Importance of Air Connectivity and the Impact on Romanian Airports
2019
In a world where passenger air travel is set to keep a positive growth rate over the years, airports all over the world are striving to increase their connectivity rate by attracting different airline companies, either for point to point connections or hub connectivity to wider the number of destinations reached from the airport to all over the world via a hub. From an airport perspective, creating a strategy to increase the connectivity performance index requires a lot of market analysis, following latest developments of hub connections from all over Europe, as hub connectivity tends to change on a yearly basis. Airport connectivity performance is directly linked to growth, studies (ACI Eu…
RIFLESSIONI COMPARATISTICHE A MARGINE DELLE SCELTE IN TEMA DI TRATTAMENTO SANITARIO
2018
The essay deals with advance directives to allow or to refuse medical treatment, specifically when the person is in a situation of incapacity. The first part focuses the notion of human dignity in connection with the idea of individual autonomy as right to personal identity and as right to health. The second part of the essay is dedicated to the more remarkable parts of Italian legislation (l. 219/ 2017) that enables someone aged 18 and over, while still capable, to take decisions for foreseeable medical treatments for a time in the future when they may lack the capacity to consent to or refuse that treatment. At last, under a comparative point of view, the essay deals with the English stat…