Search results for "relation"
showing 10 items of 10542 documents
Autocorrelation Metrics to Estimate Soil Moisture Persistence From Satellite Time Series: Application to Semiarid Regions
2021
Satellite-derived soil moisture (SM) products have become an important information source for the study of land surface processes in hydrology and land monitoring. Characterizing and estimating soil memory and persistence from satellite observations is of paramount relevance, and has deep implications in ecology, water management, and climate modeling. In this work, we address the problem of SM persistence estimation from microwave sensors using several autocorrelation metrics that, unlike traditional approaches, build on accurate estimates of the autocorrelation function from nonuniformly sampled time series. We show how the choice of the autocorrelation estimator can have a dramatic impac…
Design of measurement-based correlation models for shadow fading
2010
This paper deals with the design of measurement-based correlation models for shadow fading. Based on the correlation model, we design a simulation model using the sumof-sinusoids (SOS) method to enable the simulation of spatial lognormal processes characterizing real-world shadow fading scenarios. The model parameters of the simulation model are computed by applying the L p -norm method (LPNM). This method facilitates an excellent fitting of the simulation model's autocorrelation function (ACF) to that of measured channels. Our study includes an evaluation of all important statistical quantities of the proposed measurement-based simulation model, such as the probability density function (PD…
Mediadores psicológicos y motivación deportiva en judocas españoles.
2006
El presente trabajo analizó las diferencias de la motivación en situación precompetitiva de judocas en función de los mediadores psicológicos (percepciones de competencia, apoyo a la autonomía y relaciones sociales), tal y como postula el Modelo Jerárquico de la Motivación Intrínseca, Extrínseca y Amotivación (Vallerand, 1997, 2001; Vallerand y Losier, 1999). Se empleó una muestra de 181 judocas de edades comprendidas entre los 14 y 16 años. Utilizamos una metodología selectiva, con diseño prospectivo simple. Los datos se analizaron mediante un MANOVA, tomando como variables independientes los mediadores psicológicos y el sexo de los deportistas y como variables dependientes cada una de las…
Implications of Managerial Framing of Stakeholders in Environmental Reports
2014
Corporate environmental reports are increasingly viewed as products of the managerial framing of responsibility and stakeholders. This notion encouraged us to conduct a multiple case study on how stakeholders are framed in environmental reports. We show how interaction between companies and stakeholders is described in the environmental reports of three firms operating in different business sectors – financial, aviation and energy – over a period of five years. We use an inductively oriented content analysis to identify five categories of relationships being constructed in the data: demanding, promoting, committing, donating and preventing. We then show how commitment and promotion dominate…
A combined experimental and theoretical study of the thermal cycloaddition of aryl azides with activated alkenes.
2011
International audience; Reactions were performed from aryl azides on the one hand, and activated alkenes coming from β-dicarbonyl compounds or malonodinitrile on the other hand, either with recourse to conventional heating or to microwave activation, to afford 1-aryl-1H-1,2,3-triazoles. The mechanism and the regioselectivity of the reactions involving β-dicarbonyl compounds have been theoretically studied using DFT methods at the B3LYP/6-31G* level: they are domino processes comprising a tautomeric equilibrium of the β-dicarbonyl compounds with their enol forms, a 1,3-dipolar cycloaddition of the enol forms with the aryl azides (high activation energy), and a dehydration process (lower acti…
A new method of anomeric protection and activation based on the conversion of glycosyl azides into glycosyl fluorides
1993
Glycosyl azides provide reliable anomeric protection stable to conditions for hydrolytic removal of ester groups, for reductive opening or release of acetalic diol protection, for the introduction of ether-type protection, and for glycosylation processes. The utility of this anomeric protection is further enhanced as glycosyl azides may be converted into glycosyl fluorides, which can be activated for glycosylation reactions. To this end, glycosyl azides have been subjected to 1,3-dipolar cycloaddition with di-tert-butyl acetylenedicarboxylate. On treatment with hydrogen fluoride-pyridine complex the N-glycosyl triazole derivatives directly give glycosyl fluorides.
How to increase company loyalty: using relational variables and sustainable practices to segment the maritime transport sector
2022
Intense competition in goods transportation has highlighted theimportance of understanding customers’interests in order to designsuccessful relationship strategies. This study proposes, through asegmentation approach, to identify customer groups based on theirperceptions of sustainable practices and relational variables abouttheir main transport supplier. From a sample of 122 companies, amultiple correspondence analysis was carried out. The results showthat there are three groups of customer companies, which corres-pond to a high, low, and medium relational and sustainabilityapproach. The identified segments are also significantly different interms of time of operation in the maritime secto…
Formation et insertion des apprentis de niveau V, quelle relation rétablir ?
1990
International audience
L'insertion professionnelle des jeunes de niveau 5 en Franche-Comté en 1980
1983
Référence interne : 83024; Les données présentées sont le produit de l'enquête réalisée auprès des jeunes francomtois sortis d'année terminale de CAP ou de BEP au cours de l'année 1978-1979, et ayant quitté me système éducatif. Cette enquête, réalisée en 1980, appréhende la situation des jeunes neuf mois après leur sortie, en mars 1980, et les emplois qu'ils occupent, de façon à cerner leur devenir à la sortie du système éducatif, les conditions d'insertion dans la vie active, et les inter-relations entre caractéristiques de formation reçue, d'une part, et situation et caractéristiques d'emploi d'autre part.
Déjà vu experiences in healthy subjects are unrelated to laboratory tests of recollection and familiarity for word stimuli
2013
Recent neuropsychological and neuroscientific research suggests that people who experience more déjà vu display characteristic patterns in normal recognition memory. We conducted a large individual differences study (n = 206) to test these predictions using recollection and familiarity parameters recovered from a standard memory task. Participants reported déjà vu frequency and a number of its correlates, and completed a recognition memory task analogous to a Remember-Know procedure. The individual difference measures replicated an established correlation between déjà vu frequency and frequency of travel, and recognition performance showed well-established word frequency and accuracy effect…