Dört farklı oksitlenme işleminin Cu-9Al-5Ta YSŞHA’nın oksidasyon davranışları, faz bileşenleri, mikroyapısal özellikleri ve termodinamik parametreleri üzerine etkileri DTA/TG, XRD, SEM-EDX DSC analiz ölçümleri alınarak incelendi. 700, 800, 900 1000°C olarak belirlenen sıcaklıklarında, 900°C’den sonra yüzey oksitlenmenin doygunluğa ulaştığı böylece sabitinin yükselmediği gözlendi. Alaşımdaki α(9...

Mo ol le ec cu ul la ar r m me ec ch ha an ni is sm ms s o of f e ec ct to od de er rm ma al l d dy ys sp pl la as si ia a s sy yn nd dr ro om me es s A Ac ca ad de em mi ic c D Di is ss se er rt ta at ti io on n To be discussed publicly with the permission of the

A first-principles approach to calculating the elastic stiffness coefficients at finite temperatures was proposed. It is based on the assumption that the temperature dependence of elastic stiffness coefficients mainly results from volume change as a function of temperature; it combines the first-principles calculations of elastic constants at 0 K and the first-principles phonon theory of therma...

We report the fixing of photorefractive holographic gratings with high efficiency in a sample of K(1-y)Li(y)Ta(1-x)Nb(x)O(3) doped with Cu, V, and Ti. Holograms are thermally fixed through the screening of a photorefractive space-charge f ield by a nonphotoactive species at elevated temperatures. Fixed holograms are revealed by illumination at lower temperatures. Diffraction efficiencies of 25%...

Structural investigations of several minerals belonging to the calaverite group with composition Au1–xAgxTe2 (x = 0.00, 0.02, 0.05, 0.09, 0.19, and 0.33) indicate that Ag is randomly distributed on the Au sites. This suppresses the valence fluctuation of Au and, therefore, the structure modulations. The results are compared with the previously published incommensurately modulated structure of c...

Ori en ta tion sur veys are an es sen tial part of any largescale geo chem i cal pro gram be cause they serve to es tab lish op ti mum sam pling and an a lyt i cal tech niques. Among vari ables that need to be de ter mined by a soils ori en ta tion are the sam ple den sity, soil ho ri zon, sam ple grain size or min eral frac tion, and an a lyt i cal method. Es tab lish ing geo chem i cal back g...

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