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1
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Liquid Phase Contained in Porous Rock as Observed by Proton Magnetic Relaxation

100%
Harańczyk H., Wójcik A.
Acta Physica Polonica A
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2000
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vol. 98
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issue 1-2
153-161
EN
High power proton relaxometry was applied to investigate the liquid phase contained in porous rock. Proton free induction decays and spin-lattice relaxation times allowed us to investigate the pore distribution and the contribution of mobile and of immobilized liquid. The differences in pore distributions in oil-containing limestone and in Węglowicki sandstone were found. The fractal exponent for pore distribution in Węglowicki sandstone was fitted using both stretched exponential and modified stretched exponential models. The results of both approaches are compared.
2
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Multiparty d-Dimensional Quantum Information Splitting

100%
Grudka A., Wójcik A.
Acta Physica Polonica A
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2002
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vol. 102
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issue 6
703-707
EN
Generalization of quantum information splitting protocol from qubits to qudits (quantum d-dimensional systems) is presented.
3
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Adaptive controller design for electric drive with variable parameters by Reinforcement Learning method

85%
Pajchrowski T., Siwek P., Wójcik A., Pajchrowski T., Siwek P., Wójcik A.
|
2020
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issue 5
4
Content available remote

Impact of Vanadium(IV)-Oxy Acetylacetonate and Vanadium(III) Acetylacetonatel on the DPPC Liposome Membranes: EPR Studies

81%
Man D., Mrówka I., Wójcik A., Pytel B.
Acta Physica Polonica A
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2017
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vol. 132
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issue 1
52-56
EN
The effect of vanadium (IV)-oxy acetylacetonate (V4) and vanadium(III) acetylacetonate (V3) on the liposome membranes formed of synthetic lecithin (DPPC) was presented in this paper. Liposomes were formed during the sonication of DPPC lecithin in an aqueous medium. The concentration of the vanadium compounds changed in the range of 0% to 2.4% in molar ratio to the lecithin. The EPR technique made use of three spin probes penetrating the different areas of the membrane (as follows: TEMPO, 16-DOXYL stearic acid methyl ester, stearic acid 5-DOXYL methyl ester). TEMPO probe penetrates the interphase water-lipid (partition parameter F), the probe 16-DOXYL locates in the middle of the lipid bilayer (rotational correlation time τ), the probe 5-DOXYL gives a picture of membrane fluidity (the order parameter) just below the polar head groups. The results of our research showed the following conclusions. The change of membrane fluidity, as a function of admixture concentration, was dependent on the type of additives. TEMPO probe recorded an increase in liquidity interphase water-lipid for both admixtures: V3 and V4. 16-DOXYL probe indicated that the admixture V3 increases the fluidity in the center of the lipid bilayer. Admixture V4 significantly less impacted on the change of the membrane middle. The 5-DOXYL probe did not influence on the membrane surface portion, there were not observed significant changes under the impact of admixtures. V3 showed stronger impact on membrane fluidity.
5
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The concentration of urea in hemolymph as a marker of health in Lissachatina fulica and Cornu aspersum edible snails – a preliminary study

72%
Ziętek J., Guz L., Wójcik A., Winiarczyk S., Adaszek Ł., Ziętek J., Guz L., Wójcik A., Winiarczyk S., Adaszek Ł.
Polish Journal of Veterinary Sciences
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2019
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issue 2
6
Content available remote

Influence of Fe Addition on the Martensitic Transformation, Structure and Magnetic Properties of Metamagnetic Ni-Co-Mn-Sn Alloys

62%
Wójcik A., Maziarz W., Szczerba M., Sikora M., Hawełek Ł., Czaja P.
Acta Physica Polonica A
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2016
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vol. 130
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issue 4
1026-1028
EN
In this study the effect of Fe for Ni substitution in Ni₄₄Co₆Mn₃₉Sn₁₁ metamagnetic shape memory alloys on their structure, magneto-structural transformation characteristics, magnetic and magnetocaloric properties was studied. The results show that the structure and martensite transformation behavior strongly depends on the Fe concentration. The martensitic transformation temperature decreases with 1 at.% of Fe and is suppressed with higher Fe content. It was further found that substitution of Fe for Ni leads to lowering of the value of magnetic entropy change.
7
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Monocrystalline and Polycrystalline ZnO and ZnMnO Films Grown by Atomic Layer Epitaxy - Growth and Characterization

52%
Wójcik A., Kopalko K., Godlewski M., Łusakowska E., Paszkowicz W., Dybko K., Domagała J., Szczerbakow A., Kamińska E.
Acta Physica Polonica A
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2004
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vol. 105
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issue 6
667-673
EN
Recently we demonstrated growth of monocrystalline ZnO films by atomic layer epitaxy in the gas flow variant using inorganic precursors. In this study, we discuss properties of ZnO films grown with organic precursors. Successful Mn doping of the ZnO films during the growth was achieved using the Mn-thd complex. Secondary ion mass spectroscopy and X-ray investigations reveal the contents of Mn up to about 20% of the cationic component.
8
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Do We Understand Magnetic Properties of ZnMnO?

42%
Godlewski M., Wójcik A., Kopalko K., Ivanov V., Wilamowski Z., Jakieła R., Guziewicz E., Szczepanik A., Dłużewski P., Chikoidze E., Barjon J., Dumont Y., Putkonen M., Niinistö L., Tang D.
Acta Physica Polonica A
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2007
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vol. 112
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issue 2
261-267
EN
Optical and magnetic properties of ZnMnO films are discussed based on the results of cathodoluminescence, photoluminescence, and magneto-photoluminescence investigations. We show that photoluminescence/cathodoluminescence emissions are strongly quenched and become in-plane inhomogeneous in samples with increased Mn fractions. Strong polarization of photoluminescence is observed, even though excitonic lines do not shift and are not split at magnetic fields up to 6 T.
9
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Magnetic, Structural, and Optical Properties of Low Temperature ZnMnO Grown by Atomic Layer Epitaxy

42%
Wójcik A., Kiecana M., Kopalko K., Godlewski M., Guziewicz E., Yatsunenko S., Łusakowska E., Minikayev R., Paszkowicz W., Świątek K., Wilamowski Z., Sawicki M., Dietl T.
Acta Physica Polonica A
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2005
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vol. 108
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issue 5
915-921
EN
Magnetic, structural, and optical properties of ZnMnO films grown with atomic layer epitaxy are discussed. Atomic layer epitaxy films were grown at low temperature using organic zinc and manganese precursors. From magnetometry and electron spin resonance investigations we conclude that lowering of a growth temperature significantly limits formation of Mn precipitates and inclusions of different foreign phases of manganese oxides to ZnMnO host.
10
Content available remote

Extra-Low Temperature Growth of ZnO by Atomic Layer Deposition with Diethylzinc Precursor

42%
Kowalik I., Guziewicz E., Kopalko K., Yatsunenko S., Godlewski M., Wójcik A., Osinniy V., Krajewski T., Story T., Łusakowska E., Paszkowicz W.
Acta Physica Polonica A
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2007
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vol. 112
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issue 2
401-406
EN
ZnO thin films were grown on silicon substrate by atomic layer deposition method. We explored double-exchange chemical reaction and used very volatile and reactive diethylzinc as a zinc precursor. These enables us to obtain zinc oxide thin films of high quality at extremely low growth temperature (90-200ºC). The films are polycrystalline as was determined by X-ray diffraction and show flat surfaces with roughness of 1-4 nm as derived from atomic force microscopy measurements. Photoluminescence studies show that an edge emission of excitonic origin is observed even at room temperature for all investigated ZnO layers deposited with the diethylzinc precursor.
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