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1
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Diffuse Neutron Scattering in the Mn_{0.4}Cu_{0.6} Alloy

100%
Jankowska-Kisielińska J., Mikke K., Fijał-Kirejczyk I.
Acta Physica Polonica A
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2008
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vol. 113
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issue 4
1171-1178
EN
The diffuse neutron scattering in the Mn_{0.4}Cu_{0.6} alloy was measured in the temperature range 15-390K at the 3-axis neutron spectrometer at MARIA reactor in Świerk. The broad maxima of the neutron intensity were observed in the surrounding of the (0.5, 1, 0) reciprocal lattice point and other symmetry related points. The effect is similar to that observed in Mn-Cu alloys with lower Mn content at room temperature. Our results are in agreement with the earlier finding that the maxima of the short-range order incommensurate spin density wave scattering are placed at the (0.5±δ, 1, 0) reciprocal lattice point with a linear dependence of δ on the Mn concentration. In addition, some commensurate antiferromagnetic short-range order was found.
2
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Anisotropy of the Neutron Scattering in the Paramagnetic Phase and on the Spin Waves in the Mn_{0.71}Ni_{0.29} Alloy

100%
Jankowska-Kisielińska J., Fijał-Kirejczyk I., Mikke K.
Acta Physica Polonica A
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2009
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vol. 115
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issue 1
203-205
EN
We have confirmed the significant anisotropy of the generalised magnetic susceptibility in the paramagnetic and antiferromagnetic phase of the fcc Mn-Ni alloys. In this paper the detailed account of the experiments performed on the Mn_{0.71}Ni_{0.29} alloy is given. Our main result for the paramagnetic phase is that the correlation length is larger for the direction parallel to the anisotropy axis than for the perpendicular one by a factor of 1.6. The spin-wave velocity observed at 15 K is higher for the direction parallel to the anisotropy axis than that for the perpendicular direction by a factor of 1.2. These results are similar to that for the Mn_{0.62}Ni_{0.38} alloy. Our results indicate that the magnetic carriers are more localized and the magnetic interactions are less extended in alloys with higher Ni concentration.
3
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Neutron Radiography Studies of Water Self-Diffusion in Porous Medium

100%
Milczarek J., Fijał-Kirejczyk I., Chojnowski M., Żołądek J.
Acta Physica Polonica A
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2008
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vol. 113
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issue 4
1237-1244
EN
The results of neutron radiography studies on macroscopic self-diffusion of water confined within rigid porous material reveal the substantial reduction in diffusion constant in comparison to the diffusion in large volume. The studies performed in the 30-50°C temperature range on fired clay brick of 30% porosity show decrease in diffusion constant to approximately 17% of its value for free space and the Archie exponent is 1.4. The Arrhenius law was confirmed and the activation energy was found of the same value as in the water bulk.
4
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The Effect of Sodium Chloride on the Process of Drying of Porous Media

100%
Fijał-Kirejczyk I., Milczarek J., Jurkowski Z., Żołądek J.
Acta Physica Polonica A
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2013
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vol. 124
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issue 6
1025-1028
EN
The high temperature drying process of corundum cylinders partially saturated with aqueous solutions of sodium chloride was investigated with neutron imaging technique accompanied with mass and temperature measurements. The statistical analysis of neutron images was applied in order to quantify the time evolution of the process. The substantial slowing down of drying with increasing salt concentration was found. This effect was attributed to increase of viscosity of the solution with increasing salt content as well as to the formation of an outer layer of NaCl on the sample surface.
5
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Transient Thermal Phenomena during Spontaneous Water Migration in Zeolite Beds

88%
Żołądek-Nowak J., Milczarek J., Fijał-Kirejczyk I., Żołądek J., Jurkowski Z.
Acta Physica Polonica A
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2012
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vol. 122
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issue 2
415-418
EN
The changes in local temperature occurring during spontaneous imbibition of columnar samples of dry natural zeolite with water were studied. The temperature pulses of 20-250 s duration and 3-40°C amplitude were registered and correlated with the wetting front motion observed with neutron radiography. The amplitude of the pulses was shown to increase with increasing ambient temperature. The broadening of the temperature pulse with increasing distance from the water supplied end of the samples was observed. The amplitude and the pulse width were found to depend substantially on the drying temperature of the material. The observed effect was attributed to the heat of immersion released in the sample at the moving wetting front.
6
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Effect of Gravitation on Water Migration in Granular Media

88%
Milczarek J., Fijał-Kirejczyk I., Żołądek J., Chojnowski M., Kowalczyk G.
Acta Physica Polonica A
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2008
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vol. 113
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issue 4
1245-1254
EN
The results of the experiments on water migration in unsaturated granular media performed with dynamic neutron radiography technique are presented. It was found that the porosity of the medium did not determine the kinetics of the process in a marked way. The influence of gravity was found to be considerable for media like coarse sand and gravel, consisting of large grains. No effect of gravitation on the water migration in clay beds was observed. The results are discussed in terms of the classical Washburn-Bosanquet theory of adhesion driven motion of the liquid in a straight circular capillary under gravity. It was found that this theory provides only qualitative description of the water migration within granular media, and the viscous dissipation effects are greatly underestimated.
7
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Materials Research on Archaeological Objects Using PIXE and Other Non-Invasive Techniques

76%
Miśta E., Stonert A., Korman A., Milczarek J., Fijał-Kirejczyk I., Kalbarczyk P., Wiśniewska A.
Acta Physica Polonica A
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2015
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vol. 128
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issue 5
815-817
EN
An interdisciplinary study of metallic objects from selected archaeological sites in Poland was performed. The aim of the project was to obtain information about the chemical composition and structural changes of the objects. Furthermore, the research results provided information about the technological process which was used to manufacture the artifacts. The materials research had a non- and micro-invasive character which is very important in this type of investigation. The main experimental tools were particle-induced X-ray emission supplemented with nuclear reaction thermal neutron (white beam) radiography, scanning electron microscopy with X-ray energy dispersive analysis, and laser ablation inductively coupled plasma mass spectrometry techniques. The results show that the artifacts were made by a secondary smelting process used in local metallurgy manufactures.
8
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Application of Statistical Image Analysis in Quantification of Neutron Radiography Images of Drying

76%
Fijał-Kirejczyk I., Milczarek J., Żołądek-Nowak J., de Beer F., Radebe M., Nothnagel G.
Acta Physica Polonica A
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2012
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vol. 122
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issue 2
410-414
EN
The statistical approach to the thermal neutron radiography picture analysis is applied to evaluation of the experimental results obtained for drying of rectangular and cylindrical samples of granulated and rigid porous materials. We have shown that the time dependence of the standard deviation of image brightness reflects the appearance and motion of the drying front observed during second period of the drying process. The results are discussed within a simple two-region model of the drying sample image.
9
Content available remote

Drying Kinetics of Particulate Corundum Layers

76%
Cmiel K., Milczarek J., Bam L., Fijał-Kirejczyk I., Jurkowski Z., Żołądek J.
Acta Physica Polonica A
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2013
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vol. 124
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issue 6
1029-1033
EN
The results of studies on drying of layers of particulate corundum performed with digital neutron radiography are presented. The statistical analysis of images was employed to reveal main features of the drying process. It is shown that the first period of drying proceeds within the whole body of the sample. Marked signatures of the end of first period of drying were found for sample mass, temperature, average image brightness as well as standard deviation of brightness time evolutions for the system composed of fine grains. The chaotic nature of this period is delineated by a distinct maximum in the standard deviation of sample image brightness. The presence of the drying front moving from the open surface to the sample bottom is proven to be an attribute of the advanced drying period.
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