Search results for "Indice"
showing 10 items of 214 documents
R E L A Z I O N I T R A I N D I C E D I R E S I S T E N Z A I N T R A PA R E N C H I M A L E R E N A L E E D E N S I TA’ VA S C O L A R E R E T I N …
2022
FUNZIONALITA' RENALE E INDICE DI RESISTENZA (IR)
2007
INTRODUZIONE La valutazione dell’indice di resistenza renale (IR) nel post trapianto è stata largamente dibattuta e nonostante mostri valori differenti nei vasi iterlobulari rispetto a quelli interlobari il suo valore diagnostico è ormai indiscusso. Nel seguente lavoro i risultati dei valori medi di IR renale valutati nei tratti distali delle arterie interlobulari sono stati correlati alla funzionalità renale. METODI Da gennaio 2001 a maggio 2007 in 55 pazienti sottoposti a trapianto renale abbiamo eseguito, durante un follow-up medio di 6 mesi, una valutazione ecodoppler del graft e del tratto distale delle arterie interlobulari. Tutti gli esami sono stati condotti dallo stesso esaminatore…
L’INDICE DI RESISTENZA (IR) QUALE FATTORE PROGNOSTICO NELL’OUTCOME DEL TRAPIANTO DI RENE
2009
Introduzione Il valore diagnostico dell’’indice di resistenza renale (IR) nel post trapianto è ormai indiscusso. Nel seguente lavoro ci si propone di correlare i valori medi di indice di resistenza renale a carico dei tratti distali delle arterie interlobulari alla funzionalità renale, quale fattore prognostico nella valutazione della sopravvivenza del graft. Metodi La popolazione sottoposta a studio comprende 100 pazienti trapiantati dal gennaio 2001 al dicembre 2008, durante un follow-up medio di 12 mesi, mediante una valutazione ecodoppler del graft e del tratto distale delle arterie interlobulari.Tali dati sono stati messi a confronto con alcuni parametri di funzionalità renale quali il…
Do Country Stereotypes Exist in PISA? A Clustering Approach for Large, Sparse, and Weighted Data
2015
Certain stereotypes can be associated with people from different countries. For example, the Italians are expected to be emotional, the Germans functional, and the Chinese hard-working. In this study, we cluster all 15-year-old students representing the 68 different nations and territories that participated in the latest Programme for International Student Assessment (PISA 2012). The hypothesis is that the students will start to form their own country groups when clustered according to the scale indices that summarize many of the students’ characteristics. In order to meet PISA data analysis requirements, we use a novel combination of our previously published algorithmic components to reali…
Blind Source Separation Based on Joint Diagonalization in R: The Packages JADE and BSSasymp
2017
Blind source separation (BSS) is a well-known signal processing tool which is used to solve practical data analysis problems in various fields of science. In BSS, we assume that the observed data consists of linear mixtures of latent variables. The mixing system and the distributions of the latent variables are unknown. The aim is to find an estimate of an unmixing matrix which then transforms the observed data back to latent sources. In this paper we present the R packages JADE and BSSasymp. The package JADE offers several BSS methods which are based on joint diagonalization. Package BSSasymp contains functions for computing the asymptotic covariance matrices as well as their data-based es…
Recent applications of point process methods in forestry statistics
2000
Forestry statistics is an important field of applied statistics with a long tradition. Many forestry problems can be solved by means of point processes or marked point processes. There, the "points" are tree locations and the "marks" are tree characteristics such as diameter at breast height or degree of damage by environmental factors. Point pro- cess characteristics are valuable tools for exploratory data analysis in forestry, for describing the variability of forest stands and for under- standing and quantifying ecological relationships. Models of point pro- cesses are also an important basis of modern single-tree modeling, that gives simulation tools for the investigation of forest stru…
Biproportional Method for Analysing Interindustry Dynamics: the case of France
1990
Two elements are being presented in this paper: (1) A new and original method for analysing matrix dynamics, called the synthetical biproportional projector method (SBP), which can be used to project input–output tables and compare one with another. (2) Some results for France for the important period 1970–85. The paper starts with the observation that no systematic study of the change in the French productive structure as displayed In the input–output tables (tableaux entries-sorties in France) has ever been made. This is unfortunate, since a complete series of data is now available concerning a key period of the French economic evolution including the petroleum crisis, European integratio…
Predicting gully occurrence at watershed scale: Comparing topographic indices and multivariate statistical models
2020
In this study, the ability of five topographic indices to predict the gully trajectories observed in two adjacent watersheds located in Sicily (Italy) was evaluated. Two of these indices, named MSPI and MTWI, as far as we know, have never been employed to this aim. They were obtained by multiplying the stream power index (SPI) and the topographic wetness index (TWI), respectively, by the convergence index (CI). The predictive ability of the topographic indices was measured by using both cut-off independent (AUC: area under the receiver operating characteristic curve) and dependent statistics (Cohen's kappa index κ, sensitivity, specificity). These statistics were calculated also for 100 MAR…
Differences of stabilized organic carbon fractions and microbiological activity along Mediterranean Vertisols and Alfisols profiles
2010
This study examined the chemical and structural properties of humic substances and microbiological activity in order to verify differences in carbon dynamics along soil profiles in two Vertisols (Typic Haploxerert and Xeric Epiaquert) and two Alfisols (Mollic Haploxeralf and Ultic Haploxeralf) developed under Mediterranean climate in Italy. Humification parameters, thermal methods, including differential scanning calorimetry (DSC) and thermogravimetry (TG), together with Fourier transform infrared (FT-IR) and fluorescence spectroscopies were used to characterize humic acids (HA). Microbiological activity of soils was assessed by basal respiration, metabolic quotient (qCO2) and Cmic:Corg rat…
Design of a transverse flux machine for power generation from seawaves
2014
In this paper, we present a transverse flux linear generator. We investigate the possibility to use this generator to extract energy from seawaves. We propose an optimization procedure that allows us to obtain an optimized design of the generator. The optimized design of the converter shows a power generation capability index much higher than other renewable systems.