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Non-Destructive Characterization, Inspection, Failure Analysis of Advanced Components and Sensors with a High Resolution and High Contrast Micro XCT System

100%

Lau S. , Kowalczyk A.

Acta Physica Polonica A

2009

tom 116

nr S

S-192-S-193

Superconducting Properties of Mo_2Re_3B_x-Mo_3Re_2B_x Eutectic

80%

Andrzejewski B. , Guilmeau E. , Kowalczyk A. , Jurga W.

nr 5

727-735

We synthesized, for the first time, superconducting eutectic composed of two new superconducting phases, namely of Mo_2Re_3B_x and of Mo_3Re_2B_x (where x≈1) and investigated its basic transport, magnetic, and microwave properties. The transition temperatures T_c were equal to 6.6 K and to 8.7 K for Mo_3Re_2B_x and Mo_2Re_3B_x compound, respectively. The phases present in the eutectic were identified by means of energy dispersion spectroscopy analyses. It was also shown that the two phases in the eutectic were separated by thin boron interface and formed regular network of the Josephson junctions which very effectively absorbed microwave energy.

Electronic Properties of CeNiAl₄ Based on ab initio Calculations and XPS Measurements

80%

Werwiński M. , Chełkowska G. , Szajek A. , Kowalczyk A.

nr 3

517-519

The CeNiAl₄ compound crystallizes in an orthorhombic YNiAl₄-type structure with a Cmcm space group. The earlier susceptibility data and X-ray photoelectron spectroscopy (XPS) suggested a localized character of the 4f states in CeNiAl₄ with a valence state close to a Ce⁺³ ion. In this work we present a combined theoretical and experimental study of the electronic structure for the Kondo dense system CeNiAl₄ based on the XPS data and ab initio calculations. Using the band structure calculations the theoretical XPS valence band spectra are evaluated. Below the Fermi energy the total density of states contains mainly 3d states of Ni hybridized with Ce 4f states.

Analysis of computational complexity in holographic lens-less projection

61%

Kowalczyk A. , Bieda M. , Makowski M. , Ducin I. , Kakarenko K. , Suszek J. , Sobczyk A.

nr 3

84-86

In lens-less projection the illuminating wavefront must be modified, so that after propagation on a certain distance it would form an image on the screen. Formed images will be displayed with a frame rate minimum of 20fps in the case of an animated movie. Thus, the speed of computing is extremely important. Computing might be performed by the central processing unit (CPU) or the graphics processing unit (GPU). Reaching a compromise between computational complexity (as well as the time of computing) and the quality of an obtained image is needed. This leads to a need for a proper iteration number of an algorithm, its parameters and size of computing matrices.

X-Ray Photoemission Spectra of Dy(Co_{1-x}Al_{x})_{2} Systems

61%

Szajek A. , Jezierski A. , Kowalczyk A. , Baszyński J. , Bartkowski S. , Neumann M. , Borstel G.

nr 2

439-442

The electronic structure of Dy(Co_{1-x}Al_{x})_{2} compounds (Laves phase - MgCu_{2}, C15) for Al concentrations x = 0.0, 0.1, 0.2 was investigated by X-ray photoelectron spectroscopy. The results were compared with the ab initio band structure calculations.