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1
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Analysis of Texture and Microstructure of Annealed Fe-23Mn-3Si-3Al Steel

100%
Kowalska J.
Acta Physica Polonica A
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2016
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vol. 130
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issue 4
946-949
EN
Texture and microstructural examinations of Fe-23%Mn-3%Si-3%Al (mass%) alloy are presented. After casting the ingot was homogenized at 1150°C, hot-rolled in the temperature range 1200°C-900°C and then cold-rolled. Steel samples, after 40% deformation, were annealed at 300°C for 10 min, 600°C and 750°C for 30 min. X-ray diffraction and metallographic studies revealed deformation-induced mechanical twinning and phase transformation. The crystallographic Shoji-Nishiyama and Kurdjumov-Sachs relations between martensite (ε, α') and austenite (γ), were found in the cold-rolled material. During annealing the reverse martensite to austenite transformation occurred.
2
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Mapping of Copper Oxidation State Using High Pressure X-Ray Photoelectron Spectroscopy

64%
Kowalska J., Gopinath C.
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EN
The interaction of O_2 with polycrystalline foil of Cu, from ultra high vacuum to 1 mbar and up to 773 K has been investigated. The study were performed by using the high pressure X-ray photoelectron spectroscopy (electron spectroscopy for chemical analysis) ultraviolet photoelectron spectroscopy system. In this work the results of mapping copper oxidation states as a function of temperature at 1 mbar O_2 have been presented.
3
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Investigation of Trace Element Concentration in Diabetic Rat's Tissues

51%
Kowalska J., Krośniak M., Gryboś R., Kwiatek W.
Acta Physica Polonica A
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2009
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vol. 115
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issue 2
556-560
EN
Diabetes is one of the most frequent diseases in developing countries and thus there is a significant interest in diabetes related studies. It was found that vanadium compounds have glucose-lowering properties in diabetes and therefore it is very important to estimate the vanadium dose in diabetes treatment. On the other hand, the proper estimation of vanadium concentration is important due to side effects that occur in vanadium supplementation. In this study the influence of V(IV) and V(V) compounds with different ligands on the concentration of K, Ca, Mn, Fe, Cu, and Zn in selected rat's tissues was investigated by means of proton induced X-ray emission technique. As a result of the measurements it was found that the concentration of vanadium depends on the organ. The highest value was determined in spleen while the lowest in pancreas. It was also found that the concentration of other elements depends on the presence of vanadium and its concentration. The most meaningful influence of vanadium presence was on iron concentration in spleen, on copper and zinc in kidney, and on manganese in pancreas.
4
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Influence of Die Forging Parameters on the Microstructure and Phase Composition of Inconel 718 Alloy / Wpływ Warunków Kucia Matrycowego Na Mikrostrukturę Oraz Skład Fazowy Stopu Inconel 718

51%
Bunsch A., Kowalska J., Witkowska M.
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issue 4
5
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Effect of 1-substituted imidazole derivatives for the curing process of epoxy- -isocyanate composition

51%
Pilawka R., Kowalska J., Czech Z.
Polish Journal of Chemical Technology
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2013
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vol. 15
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issue 4
36-41
EN
The kinetics of the curing process of isocyanate-epoxy materials hardened in the presence of 1- substituted imidazole derivatives was studied by the Coast-Redfern method. The extent of a conversion parameter of the curing process in two ways was calculated: DSC (peak area integration) and rheology (viscosity changes). The activation energy values were determined for epoxy-isocyanate cured in the presence of 0.5; 1.0 and 2.0 phr 1-substituted imidazole derivatives respectively. Increasing of accelerators amount results in decreasing the activation energy and other kinetic parameters.
6
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Microstructural Changes in a High-Manganese Austenitic Fe-Mn-Al-C Steel

51%
Kowalska J., Witkowska M., Zielińska-Lipiec A., Ratuszek W.
Archives of Metallurgy and Materials
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2014
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issue 3
7
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Content available

Effect of Silicon Addition on the Microstructure of Cast 24Cr-5Ni-2.5Mo-xSi Duplex Steel

51%
Kowalska J., Witkowska M., Kalandyk B., Zapała R.
Archives of Foundry Engineering
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2018
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issue 1
8
Publication available in full text mode
Content available

Microstructure And Texture Evolution During Cold-Rolling In The Fe-23Mn-3Si-3Al Alloy

45%
Kowalska J., Witkowska M., Zielińska-Lipiec A., Ratuszek W., Kowalski M.
Archives of Metallurgy and Materials
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2015
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issue 3
9
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Content available

Fabrication of Multilayer Cu/Ni Systems with Nanometric Layers by Electrolysis Method

45%
Spilka M., Babilas R., Ratuszek W., Kowalska J., Matus K.
Archives of Metallurgy and Materials
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2018
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vol. 63
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issue 4
10
Content available remote

Individual differences in temporal information processing in humans

45%
Szelag E., Kanabus M., Kolodziejczyk I., Kowalska J., Szuchnik J.
Acta Neurobiologiae Experimentalis
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2004
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vol. 64
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issue 3
349-366
EN
This article reviews some of our investigations concerning individual differences in temporal information processing. Two different levels of temporal information processing are discussed, namely the low-frequency (i.e., a few seconds time range) and the high-frequency processing level (i.e., some tens of milliseconds range) of temporal information with respect to various experimental paradigms. Evidence has been obtained indicating that the processing of temporal information on these two levels can be influenced by various subject-related factors, out of which age, gender, developmental disorders, auditory experience and localisation of damage in the brain seem to be the most significant.
11
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FTIR Microspectroscopy in Studies of DNA Damage Induced by Proton Microbeam in Single PC-3 Cells

45%
Lipiec E., Kowalska J., Lekki J., Wiecheć A., Kwiatek W.
Acta Physica Polonica A
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2012
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vol. 121
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issue 2
506-509
EN
In recent years, the Fourier transformed infrared spectroscopy is often applied in studies of biological materials on cellular level. Undoubted advantage of this method is high sensitivity. In presented research the FTIR microspectroscopy was used to analyse the DNA damage in single PC-3 cells (prostate cancer cell line derived from bone metastases) irradiated by counted number of protons. Focused proton microbeam 2 MeV from the Van de Graaff accelerator at the Institute of Nuclear Physics, Polish Academy of Sciences, was used as an irradiation source. Four groups of single cells were irradiated with 1000, 2000, 4000, and 8000 protons per cell, respectively. Following irradiation cells were fixed in 70% ethanol and then analyzed by IR microspectroscopy. Bond analysis of IR spectra served as a base for result analysis. This research has focused on the detection of changes in DNA backbone spectral range (950-1240 cm^{-1}), which could be related to damages such as single and double strand breaks, DNA-DNA, and DNA-protein cross links. Switches and differences in intensity of DNA backbone bands (980-1149 cm^{-1}, 1151-1350 cm^{-1} - symmetric and asymmetric PO^{2-} stretching vibrations, as well as in 1110 cm^{-1} - symmetric stretching of P-O-C band) were observed. Experimental spectra of irradiated and control cells were compared with simulated spectra generated by HyperChem software. The multivariate statistical methods of principal component analysis and hierarchical cluster analysis (Ward's method) were also performed and are discussed.
12

Interactions between river catchments and the coast-al zone: the EuroCat-VisCat project

45%
Buszewski B., Kowalska J., Pacyna J., Kot A., Namiesnik J.
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EN
The overall aim of the EuroCat Project is to develop a quantifiable framework of analysis for improved planning and management of catchments by analyzing the response of coastal zones of the North, Mediterranean and Baltic Sea, to changes in fluxes of nutrients, organic and inorganic xenobiotic compounds from the European rivers and their catchments (Axios, Elbe, Humber, Po, Rhine and Vistula). These changes are a consequence of introduction a new legal regulations, schemes and socio-economic conditions in the areas of countries where these catchments are located. The scale of these changes is also dependent on biogeochemical and physical properties of the catchment and they are carried from the local to global scale. The specific goal of the VisCat program is to create a system which will be used to evaluate the environmental impacts on the Vistula river catchment and the Baltic Sea due to the change from the central economy to the market economy in Eastern and Central Europe (VisCat). The primary issue of this program is also to assess the influence of the run-off reservoir in Wloclawek (Wloclawek dam), sewage-treatment plant in Torun and Vistula river?s tributaries on reduction of sediments, plankton and other pollutants in the Vistula river. Next the impact of these local changes on the global state will be studied. Another aspect of this study area within the EuroCat-VisCat program will be estimation of socio-economic changes such as: adapting the Polish law concerning management of water resources, state, regional and local programs of activity in this area and human influence on the water and ecosystem of the Vistula catchment and the Baltic coastal zone (tourism, agriculture, industry etc.) related to directives of the European Union. Next all these results will be referred to the global situation in the whole of Europe to make a prognosis of the state and behaviour of river catchments and coastal zones in the future.
13
Content available remote

Infrared Spectroscopy in Molecular Study of the Piezoelectric Effect in Pig's Shin Bone

39%
Lipiec E., Kowalska J., Wiecheć A., Zieliński P., Kwiatek W., Iwaniec M.
Acta Physica Polonica A
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2012
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vol. 121
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issue 2
539-542
EN
Despite growing number of literature demonstrating the piezoelectric effect in bones at macro level there's still a lack of papers describing this effect at molecular level. In order to examine this effect more specifically, a study has been conducted to show the possibility of using infrared spectroscopy on samples contained in the electric field. This is the first known research on applying infrared spectroscopy to study the influence of electric field and compressive stress on bones' structure represented by the molecular IR spectrum. The samples used in this experiment as a model were prepared in pellet form, made from powdered pig's shin bone mixed with KBr (mass ratio of about 1:100). The spectra were obtained in transmission mode. Three different types of experiments were performed at each sample, which were subjected to: (a) fixed electric field (E < 40 kV/m), (b) variable electric field (0-40 kV/m), (c) compressive stress (P < 100 MPa). The obtained data have shown that the electric field and compressive stress on sample modified infrared spectra of the bone. Qualitative as well as quantitative changes in the spectral range between 900 cm^{-1} and 1200 cm^{-1} and the band at 562 cm^{-1} (PO_4^{3-} asymmetric and symmetric stretching, respectively) were observed. The relative area obtained by decomposition of the PO_4^{3-} band reaches an extreme value in the external compressive stress (10 MPa), that occur under physiological conditions. Based on presented data, it was proved that the applied factors (electric field, compressive stress) can change the oscillation energy and the number of molecule's degrees of freedom.
14
Content available remote

Chemical Composition of Atherosclerotic Plaques οf apoE/LDLR-Double Knockout Mice by Synchrotron Radiation FTIR Microspectroscopy

33%
Kowalska J., Gajda M., Kwiatek W., Franczyk-Żarów M., Kostogrys R., Chłopicki S., Sandt C., Dumas P.
Acta Physica Polonica A
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2012
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vol. 121
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issue 2
555-560
EN
Atherosclerosis is a multietiological inflammatory disease of large and medium-sized arteries of increasing incidence in westernized countries. The aim of this study was to identify the biochemical changes during the progression of atherosclerosis by synchrotron radiation Fourier transform infrared microspectroscopy in atheromas of apoE/LDLR^{-/-} mice fed egg-rich diet supplemented or not with angiotensin converting enzyme inhibitor perindopril. Synchrotron radiation Fourier transform infrared microspectroscopy technique was used to obtain information at high spatial resolution about the distribution of proteins (C-N, N-H, CO for amide I and amide II bands), lipids (CH_2, CH_3 bands) as well as mineral deposits (calcium carbonates and phosphates). Total contents of lipids and proteins were found to be significantly lower in animals treated with the diet and perindopril. An increase in saturation level of lipids was observed in animals fed with egg-rich diet when compared to the normal diet and perindopril treatment, which did not inhibit this effect. Moreover, a significant change in the secondary structure of proteins (ratio between absorption bands 1634 cm^{-1}/1656 cm^{-1} attributed to β-type and α-type, respectively) was observed in both experimental groups in comparison with the control. Principal component analysis was used to analyse the recorded spectra. It has revealed that higher content of phosphates (wavenumber range 950-1020 cm^{-1}) was observed between egg-rich diet fed animals and the control group.
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