Pierre Robert

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The study was designed to assess the external validity. both convergent and discriminant forms, of the strategy choice model proposed by Siegler and Shrager t 1984. i n C. Sophian, Ed.. 0rigirz.s c!f coanitir~ skills (pp. 129-793). Hillsdale. NJ: Erlbaum). Forty-two preschool/kindergarten children wcrc administered the Wechsl er Preschool and Primary Scale(More)
Soil, landscape and hybrid factors are known to influence yield and quality of corn (Zea mays L.). This study employed artificial neural network (ANN) analysis to evaluate the relative importance of selected soil, landscape and seed hybrid factors on yield and grain quality in two Illinois, USA fields. About 7 to 13 important factors were identified that(More)
Welcome to the Precision Agriculture International Journal. The aim of the journal is to promote results from research related to the precision agriculture concept including natural resource variability in space and time, applied geostatisŽ tics, managing variability, technology machinery, sensors, GPS, GIS, remote sensˇ. ing, S , profitability,(More)
Better understanding of within-field spatial variability of crop quality parameters and yield are needed for precision management of crops. This study was conducted to determine the magnitude of within-field variability in soil properties, corn (Zea mays L.) quality parameters and yield and to characterize their spatial structures. Another objective was to(More)
BACKGROUND Balloon predilatation of the aortic valve has been regarded as an essential step during the transcatheter aortic valve implantation (TAVI) procedure. However, recent evidence has suggested that aortic valvuloplasty may cause complications and that high success rates may be obtained without prior dilatation of the valve. We hypothesize that TAVI(More)
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