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1

Computer holography becoming practical

100%
Makowski M.
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vol. 6
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issue 3
80
EN
This editorial contains the overview of the contents of the latest volume of the Photonics Letters of Poland, devoted mainly to holography. The published papers from international research groups show a slow but constant approach of holography towards practical applications in the future. This includes both scientific measurement techniques and future consumer electronics display devices.
2
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Content available

Theoretical and experimental research of supersonic missile ballistics

45%
Zygmunt B., Motyl K., Machowski B., Makowski M., Olejniczak E.
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2015
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issue 1
3

Analysis of computational complexity in holographic lens-less projection

39%
Kowalczyk A., Bieda M., Makowski M., Ducin I., Kakarenko K., Suszek J., Sobczyk A.
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vol. 6
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issue 3
84-86
EN
In lens-less projection the illuminating wavefront must be modified, so that after propagation on a certain distance it would form an image on the screen. Formed images will be displayed with a frame rate minimum of 20fps in the case of an animated movie. Thus, the speed of computing is extremely important. Computing might be performed by the central processing unit (CPU) or the graphics processing unit (GPU). Reaching a compromise between computational complexity (as well as the time of computing) and the quality of an obtained image is needed. This leads to a need for a proper iteration number of an algorithm, its parameters and size of computing matrices.
4

Experimental study of noise and image resolution in holographic projection with different spatial division techniques

39%
Kakarenko K., Ducin I., Makowski M., Kowalczyk A., Bieda M., Suszek J.
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vol. 6
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issue 3
96-98
EN
In lens-less projection it is reasonable to display on the Spatial Light Modulator various holographic phase distributions and decide which gives the best results on the projection screen. The merit functions are high contrast and low noise ratio in projected images. For that reason we designed holograms to be displayed on the light modulator in 7 different methods. In particular, different resolutions and placements of mosaics of sub-holograms were examined.
5

Optimized computation method for real - time holographic formation of color images

39%
Makowski M., Ducin I., Kakarenko K., Kowalczyk A., Bieda M., Suszek J.
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vol. 6
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issue 3
81-83
EN
A simple method is presented of decreasing the calculation time of CGH for lensless Fourier holograms. The proposed method takes advantage of the fact that modern displays are rectangular with a high image proportion ratio of 16:9 or even higher. The CGH was calculated on a matrix of 512×1024 points. The use of small rectangular calculation matrices allowed three times fasters calculation with sustained contrast and noise ratio and greatly improved resolution.
6

Efficient noise averaging in color holography by integration on shifted Fourier spectra

39%
Ducin I., Kakarenko K., Makowski M., Kowalczyk A., Bieda M., Suszek J.
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vol. 6
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issue 3
99-101
EN
Modern holography is dealing mainly with speckle noise and computational complexity. A compromise is required between computational complexity (computing time) and quality of obtained images. This leads to a need to obtain a simple method of noise suppression with low computation complexity. An improved efficient projection of color images is presented. It uses time averaging of intensity patterns reconstructed from the same Fourier hologram with lateral shifting in x and y direction. We try to establish the optimal step of shifting the Fourier spectra in both directions for each of the primary colors.
7
Content available remote

The Influence of Morphology on Magnetic Properties of Magnetosomes

33%
Hashim A., Molčan M., Kovač J., Varchulová Z., Gojzewski H., Makowski M., Kopčansky P., Tomori Z., Timko M.
Acta Physica Polonica A
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2012
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vol. 121
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issue 5-6
1250-1252
EN
Cultivation process was changed three times. The culture medium was enriched by more amount ferric quinate (FQ magnetosomes sample) and more amounts Wolfe's vitamin solution (WVS magnetosomes sample) comparing to normal culture medium (NP magnetosomes sample). NP sample of magnetosomes shows zero coercivity and behaves superparamagnetically. The increase of coercivity (6.5 Oe for WVS and 20 Oe for FQ) may be caused by higher value of shape anisotropy and reveals stronger magnetic correlations between particles of magnetite chains.
8
Content available remote

Characterization of Magnetosomes After Exposure to the Effect of the Sonication and Ultracentrifugation

33%
Molčan M., Hashim A., Kováč J., Rajňák M., Kopčanský P., Makowski M., Gojzewski H., Molokáč M., Hvizdák L., Timko M.
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vol. 126
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issue 1
198-199
EN
Magnetosomes are intracellular organelles of widespread aquatic microorganisms called Magnetotactic bacteria. At present they are under investigation especially in biomedical applications. This ability depends on the presence of intracellular magnetosomes which are composed of two parts: first, nanometer-sized magnetite (Fe_{3}O_{4}) or greigite (Fe_{3}S_{4}) crystals (magnetosome crystal), depending on the bacterial species; and second, the bilayer membrane surrounding the crystal (magnetosome membrane). The magnetosomes were prepared by biomineralization process of magnetotactic bacteria Magnetospirillum Magnetotacticum sp. AMB-1. The isolated magnetosome chains (sample M) were centrifugated at speed of 100000 rpm for 4 hours (sample UM) and sonicated at power of 120 W for 3 hours (sample SM), respectively. The prepared suspensions were investigated with respect to morphological, structural and magnetic properties. The results from scanning electron microscopy showed that isolated chains of magnetosomes were partially broken to smaller ones after ultracentrifugation. On the other hand the application of the sonication process caused the formation of individual magnetosomes (unordered in chain). These results were confirmed by coercivity and magnetization saturation measurements.
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