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1
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Utilization of the Electrostatic Force Microscopy for Detection Filler Grains in Nanocomposites

100%
Sikora A.
|
EN
In this article the utilization of electrostatic force microscopy for grains detection of silica nanofiller in epoxy matrix composite is presented. By observation of long-range electrostatic interaction it is possible to reveal the particles inaccessible for the scanning tip.
2
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The implementation and the performance analysis of the multi-channel software-based lock-in amplifier for the stiffness mapping with atomic force microscope (AFM)

64%
Sikora A., Bednarz Ł.
Bulletin of the Polish Academy of Sciences: Technical Sciences
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2012
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issue 1
3
Content available remote

Utilization of Digital Processing of the Optical Scanning Field View for Tip-Sample Distance Estimation during the Approach Procedure

64%
Sikora A., Bednarz Ł.
|
EN
In this article we present the method of determining the tip-sample distance using advanced data processing of scanning field's optical picture. This feature can reduce both: the approach process time and the risk of damaging the tip or the sample. Experimental results will be also presented.
4
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Nanoscopic Investigation of Magnetic Thin Films by Means of Magnetic Force Microscopy Technique

51%
Sikora A., Ozimek M., Wilczyński W.
Acta Physica Polonica A
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2016
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vol. 129
|
issue 6
1226-1229
EN
In the article the results of the research aimed at the recognition of the correlation between the Ni-Fe film thickness and its magnetic domain structures are described. Magnetic thin films were prepared by pulse magnetron sputtering. Obtained thin film thicknesses were in the range of 47.6-326.0 nm. Magnetic domain structures were imaged using magnetic force microscopy. In order to obtain quantitative description of magnetic domains images, the algorithms designed for topography parameters determination were applied, enabling the comparison of specific factors related to the magnetic properties of the samples. Utilized approach provided the analysis of the impact of sputtering parameters on the morphological and magnetic properties of obtained films.
5

Heavy metals in marine sediments and biota of Spitsbergen

51%
Sikora A., Zajaczkowski M., Pempkowiak J.
Oceanological Studies
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1996
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vol. 25
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issue 3
97-109
EN
Contents of selected heavy metals (Al, Fe, Co, Ni, Cd, Pb, Zn, Cu, Cr) were meas-ured in sediment samples and biota collected off Spitsbergen. Relatively large contents of met-als in sediments were accompanied by small contents in mussels. This was attributed to the fact that sediments contain a significant amount of minerals rich in heavy metals of low bioavail-ability. Solid speciation revealed that metals incorporated into mineral lattice were by far more abundant than those adsorbed, bound to carbonates and hydroxides, and complexed to organic matter. This also explains scarce bioavailability of metals in the Spitsbergen region.
6

Haemophilus influenzae type b and pertussis vaccinations in preterm infants

51%
Sikora J. P., Chlebna-Sokol D., Ligenza I., Sikora A.
Archivum Immunologiae et Therapiae Experimentalis
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2006
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vol. 54
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issue 3
193-199
EN
Introduction: The aim of the study was to evaluate the serological efficacy of Hiberix and Infanrix-DTPa vaccines in preterm infants. Materials and Methods: The results of the investigation of 61 preterm infants immunized three times (primary vaccination) with Hiberix and Infanrix-DTPa at 6-week intervals are presented. Of the 61 children, 17 were additionally immunized with a booster dose of these vaccines. Postvaccinal response to these immunizations was evaluated by an immunoenzymatic method. Results: We observed a significant increase in protective postvaccinal antibody titers against Haemophilus influenzae type b (Hib) and Bordetella pertussis after the primary vaccination compared with the initial antibody levels (p<0.05). A significant increase (p<0.0002) in protective antibody titers after the booster dose of Hiberix compared with the primary vaccination was also noted. No correlations between birth weight, gestational age, and the achieved levels of postvaccinal anti-polyribosylribitol phosphate of Hib and of anti-pertussis toxin and anti-filamentous hemagglutinin of B. pertussis antibodies after the primary vaccination or booster dose were found. After the booster dose, all the preterm infants responded with the production of protective postvaccinal antibody titers against Hib and B. pertussis. Conclusions: Due to the very good immunogenicity of the vaccines against Hib studied, inclusion of this immunization should be proposed in the obligatory vaccination schedule in Poland, especially in preterm infants. An additional immunization (i.e. a second booster dose) of Polish children with acellular pertussis (DTPa) vaccine is necessary to protect them from decreasing protective anti-pertussis antibody titers in early childhood.
7
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Copper Deficiency - a Crystallochemical Nature of Ce-Doped Gd_2CuO_4 Phase. Part II

51%
Horyń R., Bukowska E., Sikora A., Wołcyrz M.
Acta Physica Polonica A
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2004
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vol. 106
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issue 5
733-738
EN
Two samples of nominal composition Gd_{1.80}Ce_{0.15}CuO_{4.0} and Gd_{1.85}Ce_{0.15}CuO_{4.075} were subjected for a long-term treatment in air at 1100°C, comprised with a precise control of their weights vs. time of the treatment applied. The gravimetric analysis and the iodometric titration, both showed a deficiency on Cu-site, steadily increasing vs. time with a slight tendency to a saturation. The X-ray analysis of the resulting products showed that even after 272 h of sintering, the samples remained single phase of the "214" structure type. Refinement of their crystal structures as well as density measurements, both allowed confirming Cu deficient structure constitution of these samples. Results of dc-magnetization measurements, performed prior to reduction of the sample's overall oxygen content, did not show any sign of superconductivity down to 4.2 K. These preliminary results indicate that copper deficiency, developing during synthesis, may occur to be a decisive factor for the reported lack of superconductivity in Ce-doped Gd_2CuO_4 phase. Oxygen content reduction and further tests on the samples obtained are in progress.
8
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Phase Relations in Gd_2O_3-CeO_2-CuO System at 980°C. Part I

51%
Horyń R., Sikora A., Bukowska E.
Acta Physica Polonica A
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2004
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vol. 106
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issue 5
727-731
EN
Phase equilibria in Gd_2O_3-CeO_2-CuO system were studied based on samples obtained from appropriate mixtures of the starting components, prepared by a conventional solid state reaction in air. The phase relations prevalent in this system have been deduced based on X-ray diffraction of well-equilibrated samples. An isothermal cross-section diagram through the system at 980°C is presented and chemical constitution of the Ce-doped Gd_2CuO_4 phase is proposed.
9
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Optical, Structural, and Electrical Properties of Aromatic Triphenylamine-Based Poly(azomethine)s in Thin Layers

39%
Palewicz M., Iwan A., Sikora A., Doskocz J., Strek W., Sek D., Mazurek B.
Acta Physica Polonica A
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2012
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vol. 121
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issue 2
439-444
EN
Spectroscopic and photophysical properties of the poly(azomethine)s with triphenylamine moieties were investigated by UV-vis, X-ray diffraction and atomic force microscopy methods. Current-voltage measurements were performed on ITO/polymer/Alq_3/Al, ITO/PEDOT/polymer:MWCNT/Al and ITO/polymer:MWCNT/Al devices. Multiwall carbon nanotubes were blended with polymer in the ratio 1:1. The lowest optical band gap value at 2.33 eV was detected. Moreover, an absorption coefficient α was calculated from transmission and reflectivity measurements. In this paper, we presented photophysical and structural properties of the poly(azomethine)s in solid state of great interest for the emerging field of molecular electronics and for their uses as active layers in (opto)electronic devices such as solar cells.
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