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1
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Breakdown of the De Gennes Scaling in Y_{1-x}Dy_{x}Ni_{2}B_{2}C

100%
Drzazga Z., Winiarska A., Winiarski A., Kaczorowski D.
Acta Physica Polonica A
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2000
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vol. 97
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issue 1
221-224
EN
Single crystals of Y_{1-x}Dy_{x}Ni_{2}B_{2}C (1 ≤ x ≤ 0.7) were examined by X-ray diffraction and stoichiometry was attested by XPS measurements. The superconducting transition temperature T_{c} and Neel temperature T_{N} were determined by means of magnetisation measurements. A dramatic breakdown of the de Gennes scaling in the Dy-rich compounds was found when T_{c}
2
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Structural and Magnetic Properties of Dy(Fe,V,Si)_{12} Compounds

100%
Drzazga Z., Winiarska A., Chrobak A., Kaczorowski D.
Acta Physica Polonica A
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1997
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vol. 92
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issue 2
335-339
EN
An influence of Si on the structural and magnetic properties of Dy(Fe,V,Si)_{12} compounds is studied. X-ray diffraction shows that these materials crystallise in the tetragonal ThMn_{12}-type structure. An increase in the saturation magnetization, the Curie temperatures and magnetocrystalline anisotropy in the Si substitutional systems is observed when compared with DyFe_{12-x}V_{x}. The magnetic properties depend on the preferential site occupation and concentration of Si and V atoms in these compounds.
3
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XPS Investigation of Y_{1-x}Dy_xNi_2B_2C Superconductors

100%
Winiarski A., Winiarska A., Drzazga Z.
Acta Physica Polonica A
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2008
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vol. 114
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issue 1
243-246
EN
The analysis of the valence band photoemission spectra of Y_{1-x}Dy_xNi_2B_2C (0≤x≤1) is presented. The valence bands are mainly plotted for Ni 3d, Y 4d and Dy 4f contributions, according to theoretical predictions. The valence bands of Y_{1-x}Dy_xNi_2B_2C compounds markedly change shape with the x parameter, especially in the binding energy region from 3 eV to 14 eV. For large content of Dy (above 55%) the valence band is predominant by Dy 4f states whereas Ni 3d states govern the valence band of yttrium rich compounds. Changing in domination of valence sub-band correlates with plot of superconducting transition temperature T_c with Dy concentration.
4
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Anomalous Reversible Torque in Layered Superconducting Bi_{2}Sr_{2}CaCu_{2}O_{x} Single Crystal

100%
Drzazga Z., Borgieł W., Szymczak R., Szymczak H.
Acta Physica Polonica A
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1996
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vol. 89
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issue 1
91-98
EN
Magnetic anisotropy of layered superconducting Bi_{2}Sr_{2}CaCu_{2}O_{x} single crystal was investigated by the torque method in the reversible regime. The torque was analyzed in the model taking into account 2D layered structure. Considered model gives the better fit to the data when the magnetic field is applied near (a, b) plane. Obtained results establish to 6×10_{3} value of the superconducting effective mass anisotropy coefficient ε.
5
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Magnetic Anisotropy of UFe_{10-x}Ni_{x}Si_{2} Intermetallic Alloys

88%
Drzazga Z., Suski W., Wochowski K., Wójcik J., Winiarska A.
Acta Physica Polonica A
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2000
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vol. 98
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issue 5
555-560
EN
The magnetic anisotropy in UF_{10-x}Ni_{x}Si_{2} series has been studied by torsion magnetometry and initial ac magnetic susceptibility measurements in the temperature range of 77-293K. The effective anisotropy constant changes with Ni content showing some increase for intermediate concentration. An increase in magnetic anisotropy energy at low temperatures is due to the uranium sublattice ordering. Magnetic anisotropy behaviour in UFe_{2}Ni_{8}Si_{2} is influenced by an additional enhancement of the 3d sublattice connected with the ordering Fe magnetic moments.
6
Content available remote

Use of MRI to Measure Whole Brain Atrophy in MS Patients

88%
Mazgaj P., Drzazga Z., Karpiel I., Giec-Lorenz A., Krzystanek E.
Acta Physica Polonica A
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2018
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vol. 133
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issue 3
725-727
EN
Nowadays magnetic resonance imaging is used for anatomical assessment of human brain structures in neurodegenerative disorders causing brain atrophy for instance in multiple sclerosis (MS) or in Alzheimer Disease. Pathological brain tissue loss can be described in terms of change in the brain parenchymal fraction (BPF). This work shows the impact of segmentation method in SPM12 and additional segmentation in Computational Anatomy Toolbox (CAT12) on calculated BPF value for patients suffer from with MS no treated and treated with disease-modifying drug (DMD) interferon-beta (INFb) for one year and two years. Both methods confirm that brain parenchymal fraction decreases with age, nevertheless for patients not treated INFb decreases faster than for treated. An usability of Lesion Segmentation Tool toolbox in process of automatic detection and segmentation T₂ hyperintense lesions in FLAIR images is discussed.
7
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Optimization of fMRI Analysis of Speech Areas in Pre- and Postoperative Diagnostics

88%
Karpiel I., Drzazga Z., Mazgaj P., Drzazga M., Giec-Lorenz A.
Acta Physica Polonica A
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2018
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vol. 133
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issue 3
728-730
EN
Functional magnetic resonance imaging (fMRI) was used to characterize relevant functional areas adjacent to the tumor what has important implications for surgical intervention. The aim of our study was to evaluate the functional areas of Broca and Wernicke responsible for production and understanding the speech which are very important from the point of view patients quality life using different variants of analysis available in the SPM package. Brain activity imaging with FWE controlling seems to be more appropriate than this with un uncorrected thresholds in clinical diagnostic. However analysis in the SPM should be carried out with great care taking into consideration that results can be influenced by parameters used in statistical approaches.
8
Content available remote

Effect of Endurance Training and Testosterone Treatment on the Fluorescence Spectra of Rat Serum

76%
Drzazga Z., Schisler I., Michnik A., Sadowska-Krępa E., Kłapcińska B., Gibińska J.
Acta Physica Polonica A
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2016
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vol. 129
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issue 1
15-19
EN
The paper presents an investigation into the effects of endurance training and testosterone enanthate (TE) treatment on rat blood serum by fluorescence spectroscopy. Blood serum was collected from adolescent male Wistar rats randomized between the untrained controls and trained animals, either steroid untreated or receiving I.M. injections (8 or 80 mg/kg_{BW}) of testosterone enanthate. Fluorescence measurements were performed for undiluted or 20- and 500-fold diluted serum and analysed separately in the ultraviolet and visible light regions. In both regions the impact of the TE administration was more pronounced than the effect of endurance training. Moreover, in the visible region of spectrum, originated from a number of fluorescent metabolites, the influence of studied factors was more noticeable. The opposite effect of endurance training and administration of TE on serum emission was found for a lower (8 mg/kg_{BW}) dose of testosterone, whereas a high-dose TE (80 mg/kg_{BW}) treatment resulted in a return of fluorescence intensity.
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