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Problemy rozwoju handlu elektronicznego w Polsce

100%

Chełstowski D. , Szewczyk A.

Zeszyty Naukowe. Studia Informatica / Uniwersytet Szczeciński

2012

tom Nr 30

21--44

The article includes presentation of poll research results done among customers and owners of internet shops. The main differences amongst traditional and internet commerce were marked out. Development directions of electronic commerce were formulated on the basis of research results.

EXAFS study of glasses of the CaO-Ga2O3-GeO2 system

61%

Chełstowski D. , Witkowska A. , Rybicki J. , Padlyak B. , Trapananti A. , Principi E.

Optica Applicata

2003

tom Vol. 33, nr 1

125-132

X-ray absorption spectroscopy (XAS) measurements for Ca3Ga2Ge3O12 and Ca3Ga2Ge4O14 glasses are presented. In particular, the extended X-ray absorption fine structure (EXAFS) spectra are analysed and local neighbourhood of Ga and Ge atoms is described in detail. The Ge/Ga atoms neighbourhood in considered glasses is compared with the data available for corresponding crystals. Performed comparative crystal-glass structural analysis confirms correlation between crystalline and glassy structures of the Ca3Ga2Ge3O12 and Ca3Ga2Ge4O14 compounds. Our results provide several new detailed data, and some general suggestions on the CaO–Ga2O3–GeO2 glass structure.