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Characterization of corrosion processes by current noise wavelet-based fractaland correlation analysis
Peter Planinšič, Aljana Petek, 2008, izvirni znanstveni članek

Opis: Electrochemical noise data in the presence of pitting, general corrosion and passivity were analyzed using the discrete wavelet transform. The registered current noise was decomposed into a set of band-limited details, which contain information about corrosion events occurring at a determined time-scale. It has been observed that the signal variance and variances of details depend on the intensity of processes. Distribution of the signal energy among different details was characteristic for the particular type of corrosion. The characterization of corrosion processes on the basis of in the wavelet domain calculated Hurst parameter H and fractal dimension, D, of electrochemical noise signals has been established. It is concluded that general corrosion is a stationary random process with a weak persistence and D= 2.14, whereas pitting corrosion is a non-stationary process with a long memory effect and D = 1.07. Passivity is a non-stationary process near to the Brownian motion with D = 1.56. The persistence features of electrochemical noise signals were explained also by correlation coefficients calculated between signals obtained by discrete wavelet multiresolution decomposition.
Ključne besede: elektrokemijski šum, valčki, Hurstov parameter, fraktalna dimenzija, korelacijski koeficient, korozija, electrochemical noise, wavelets, Hurst parameter, fractal dimension, correlation coefficients, corrosion
Objavljeno: 31.05.2012; Ogledov: 1165; Prenosov: 54
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The variation of F2 progenies derived from interspecific crosses between Phaseolus vulgaris and Phaseolus coccineus
Anton Ivančič, Metka Šiško, 2003, izvirni znanstveni članek

Opis: Interspecific hybridisation within the genus Phaseolus represents an importantsource of genetic variation which can be very useful in breeding programmes based on recurrent selection. The aim of this investigation was to analyse the phenotypic variation and relationships among the most important quantitative traits in F2 generation materials derived from crosses P. vulgaris x P. coccienus. P. vulgaris was used as female while P. coccineus as male parent. The F2 material was composed of 825 individuals which originated from open pollination of 65 F1 plants. The most variable quantitative trait was the number of flowers per inflorescence, which varied from 0 to 57 (CV=45,8 %). The second was the inflorescence length which varied from 2.5 to 74 cm (CV=39,0 %). The highest value (CV=70.4 %) was obtained for floral colour (a qualitative trait which was transformed into a special numerical scale).The correlation analysis showed that there were close relationships among the number of leaves, number of flowers, number of pods, number of seedsand the length of the growth period. For practical breeding, the most useful is probably the correlation between the number of inflorescences and the number of seeds per plant (r=0.503 and 0.560) because the number of inflorescences can be easily determined at the beginning of the hybridisation period, and the number of seeds is more or less directly associated with the yield. For the final visual selection, at the end of the vegetation period, the most useful trait is the number of pods, which is highly correlated with the number of seeds (r=0.740 and 0.916)
Ključne besede: interspecific hybrids, Phaseolus vulgaris x P. coccineus, hybridisation technique, phenotypic variation, phenotypic correlation coefficients
Objavljeno: 10.07.2015; Ogledov: 485; Prenosov: 14
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