Search results for "indice"

Amplitud de distribución eritrocitaria y riesgo de mortalidad en pacientes con insuficiencia cardiaca aguda

2013

Resumen Fundamento y objetivo El ancho de distribucion eritrocitaria (ADE) es una medida cuantitativa de la variabilidad del tamano de los eritrocitos circulantes utilizada clasicamente para el diagnostico diferencial de las anemias. En los ultimos anos, se ha sugerido que el ADE podria ser un marcador pronostico util en pacientes con insuficiencia cardiaca cronica. Sin embargo, es escasa la evidencia que respalda su papel en poblacion no seleccionada con insuficiencia cardiaca aguda (ICA), de manera independiente a los factores de riesgo establecidos. El objetivo del estudio fue establecer la asociacion entre el ADE y la mortalidad a largo plazo en pacientes ingresados por ICA. Pacientes y…

Alignement moléculaire : caractérisation et application à la mesure de thermalisation ultra-rapide et au contrôle de génération d'harmoniques

2013

The thematic of this thesis is molecular alignment. The latter is a very important topic that opens the way toward a much more thin control of many phenomenons. So, we have developed a new measurement technique of the molecular alignment along one axis that permits to preserve the sign of alignment. This one is, like other measurement techniques developed by the team,based on the measurement of the refractive index variation induced by the molecular alignment.The technique developed then also permits the molecular alignment measurement, being also an application of it because it allows the third harmonic generation. In the last study, molecular alignment is implemented to show that it bring…

Les vagues de chaleur au Sahel : définition et principales caractéristiques spatio-temporelles (1973-2014).

2016

A definition of heat waves (HW) relevant for dry tropical regions is proposed and tested in the Sahel (i.e. duration,intensity and frequency). The Heat Index (HI derivative of Steadman’s (1979) formula) is calculated on dailydata of 145 West African stations from the GSOD database over the period 1973-2014. HWs recorded inSahelian and Sudanese climates mainly occur in boreal spring, i.e. April-May-June. They are more frequentsince 1998 (+ 8% very hot days, T90p) and they become longer (+1.2 days per decade) and more intense (from+0.3 to 0.4 ° C / decade respectively Sudanese and Sahelian climate) on the end of the period 1973-2014.

Assessing soil contamination and temporal trends of heavy metal contents in greenhouses on semiarid land

2018

Information about the behavior and temporal evolution of heavy metals in agricultural soils is limited, particularly about greenhouse soils on semiarid lands, indeed it nonexistent. Western Almería (Southern Spain) is a semiarid land where some 30,000 ha are occupied by greenhouses with high productivity. As these greenhouses are fundamental to the socioeconomic development of this area, they should be maintained and well conserved. However, there are indications that long-term intensive agriculture with considerable agrochemicals use can deteriorate soil quality, which in turn, would reduce productivity and food quality. This study was conducted to investigate soil contamination and the te…

Reliability and effectiveness of Ellenberg’s indices in checking flora and vegetation changes induced by climatic variations

2001

Two methods are proposed to assess the significance of time-spanned local variations of Ellenberg’s indicator values in floristic and phytosociological data sets respectively. Both methods are based on frequencies and averages of the indicator values within and among data sets. Main goal of proposed methods is to determine the threshold above which the observed variations are to be considered significant. In order to relate the observed floristic variations to recent climatic changes, attention was focused on the Ellenberg’s indices dealing with the main climatic variables: heliophany, temperature and precipitation. Study-cases from Zannone Island (Pontine Archipelago, Mediterranean region)…

Angular Dependency of Hyperspectral Measurements over Wheat Characterized by a Novel UAV Based Goniometer

2015

In this study we present a hyperspectral flying goniometer system, based on a rotary-wing unmanned aerial vehicle (UAV) equipped with a spectrometer mounted on an active gimbal. We show that this approach may be used to collect multiangular hyperspectral data over vegetated environments. The pointing and positioning accuracy are assessed using structure from motion and vary from σ = 1° to 8° in pointing and σ = 0.7 to 0.8 m in positioning. We use a wheat dataset to investigate the influence of angular effects on the NDVI, TCARI and REIP vegetation indices. Angular effects caused significant variations on the indices: NDVI = 0.83–0.95; TCARI = 0.04–0.116; REIP = 729–735 nm. Our analysis high…

Modeling Fire Danger in Galicia and Asturias (Spain) from MODIS images

2014

Forest fires are one of the most dangerous natural hazards, especially when they are recurrent. In areas such as Galicia (Spain), forest fires are frequent and devastating. The development of fire risk models becomes a very important prevention task for these regions. Vegetation and moisture indices can be used to monitor vegetation status; however, the different indices may perform differently depending on the vegetation species. Eight different spectral indices were selected to determine the most appropriate index in Galicia. This study was extended to the adjacent region of Asturias. Six years of MODIS (Moderate Resolution Imaging Spectroradiometer) images, together with ground fire data…

Indice di Qualità Biologica del Suolo Indagini preliminari su ambienti costieri della Sicilia occidentale

2007

Un criterio comune per valutare a lungo termine la sostenibilità di un ecosistema è di stimare le fluttuazioni della qualità edafica (del suolo) (Schoenholtz et al., 2000), infatti, il suolo rispecchia il metabolismo di un ecosistema poiché in esso si combinano tutti i cicli biogeochimici (Dylis, 1964). Sintetizzando un concetto espresso dalla Società di Scienze del Suolo Americana (Karlen et al., 1997), si può definire la qualità edafica come “la funzionalità di un suolo nel suo stesso ambiente, la capacità di sostenere la produttività vegetale ed animale e mantenere o migliorare la qualità dell’aria e dell’acqua”. Un indicatore di qualità del suolo deve avere le seguenti caratteristiche (…

Indice ambulatoriale di rigidità arteriosa e filtrazione glomerulare nell’ipertensione arteriosa essenziale

2007

Indice delle fonti

2021

The contribution in question is concretized in the work of collation of the juridical, non-juridical, epigraphic and papyrological sources cited and discussed both in the individual contributions and in the bibliographic review collected in "IVRA. Rivista internazionale di diritto romano e antico", vol. LXIX, 2021 (publisher Jovene, ISSN 0021-3241).