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A preliminary study of the spectral characteristics of the upward radiance field in the surface layer of the Baltic.An empirical algorithm for the remote detection of chlorophyll concentration

100%
Darecki M., Olszewski J., Kowalczuk P.
Oceanological Studies
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1995
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issue 68/8
27-49
EN
The first results of experimental research into relations between the diffuse reflectance spectra of seawater and the concentrations of chlorophyll and total suspended mater in the surface layer are presented.The results allowed the preliminary classification of these waters into two basic groups, which differ from each other in the maximum reflectance and in the concentration ranges of total suspended matter.Each of the basic groups can be divided into two sub-groups, differing in the shape of the reflectance spectrum (defining the water colour), chlorophyll concentration and the level of correlation between concentrations of chloriophyll and total suspended matter.On the basis of above data a local algorithm for the radiometric estimation of chlorophyll content in the surface layer of the BAltic is also developed and presentes.
2
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Magnetocaloric Effect in Amorphous and Partially Crystallized Fe₈₀Zr₇Cr₆Nb₂Cu₁B₄ Alloy

100%
Łukiewska A., Olszewski J., Hasiak M., Gębara P.
Acta Physica Polonica A
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2018
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vol. 133
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issue 3
676-679
EN
In the present work the microstructure and thermomagnetic properties of Fe₈₀Zr₇Cr₆Nb₂Cu₁B₄ ribbon in the as-quenched state and after the accumulative annealing in the temperature range 600-800 K for 10 min were studied using Mössbauer spectroscopy and vibrating sample magnetometry. The second order phase transition from ferro- to paramagnetic state is observed. The Curie temperature T_{C} defined as inflection point on the magnetization versus temperature curve recorded on zero-field cooled mode equals 262.5 K for the as-quenched material. With increasing the annealing temperature increase of T_{C} is observed. The maximum value of the magnetic entropy change (-ΔS) observed in the vicinity of the Curie point is equal to 0.85 J/(kg K) for the alloy in the as-quenched state. Moreover, for the samples annealed up to 750 K for 10 min the low intensity maximum at about 190 K related to the supplementary magnetic phase is observed. The presence of this phase was confirmed as additional component visible on hyperfine field distributions of Mössbauer spectra.
3
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Phase Structure in Fe-Cr-Co Permanent Magnet Alloy

100%
Olszewski J., Szymura S., Wójcik J., Wysłocki B.
Acta Physica Polonica A
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1994
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vol. 85
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issue 1
205-208
EN
The Mössbauer spectroscopy, electron microscopy and magnetization measurements were used in order to describe structural changes in Fe_{58.75}Cr_{29.4}Co_{11.85} alloy during magnetic hardening. Multiphase structure was found in alloy with best magnetic properties.
4
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Ordering and Magnetoelastic Properties of Fe-Ga Alloy

100%
Perduta K., Olszewski J., Busbridge S., Nabiałek M.
Acta Physica Polonica A
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2008
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vol. 114
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issue 6
1537-1543
EN
In this paper the investigations of the ordering, microstructure and magnetomechanical properties of the Fe_{80}Ga_{20} alloy and its composites are presented. The composites consisted of the Fe-Ga particles with a size distribution in the range between 20 and 50 μm. These particles were produced by blade-milling of arc-melted alloy. After milling the powders were annealed at 723 K for 2.5, 7.5, and 12.5 h. The epoxy-bonded composites in rectangular shape were made from the as-cast as well as from the annealed powders. The Mössbauer spectroscopy studies revealed that the as-cast alloy is completely disordered. After annealing at 723 K the long range atomic order appeared. It was stated that the best magnetoelastic properties were exhibited by composites made from ferromagnetic particles obtained from the as-cast alloy. The measured saturation magnetostriction was λ_s= 70× 10^{-6} for the bulk alloy and λ_s=100× 10^{-6} for composite.
5
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Single-Polarization Single-Mode Photonic Band Gap Fiber

76%
Szpulak M., Martynkien T., Olszewski J., Urbanczyk W., Nasilowski T., Berghmans F., Thienpont H.
Acta Physica Polonica A
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2007
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vol. 111
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issue 2
239-245
EN
We studied the polarization properties of four photonic band gap fibers with elliptical core and different cladding geometries. To do so we relied on a fully vectorial calculation method, which uses a hybrid edge/nodal finite element approach with perfectly matched layer absorbing boundary conditions. We determined the spectral dependence of the confinement loss for the fundamental modes of orthogonal polarizations. Our results show that, for the four structures studied, the polarization dependent loss is so high that they can be used as fiber-optic polarizers in the full band gap range.
6
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Thermal Stability and Crystallization οf Iron and Cobalt - Based Bulk Amorphous Alloys

64%
Olszewski J., Zbroszczyk J., Sobczyk K., Ciurzyńska W., Brągiel P., Nabiałek M., Świerczek J., Hasiak M., Łukiewska A.
Acta Physica Polonica A
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2008
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vol. 114
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issue 6
1659-1666
EN
Microstructure by the Mössbauer spectroscopy and approach to magnetic saturation in the bulk amorphous Fe_{61}Co_{10}Me_7Y_2B_{20} (Me_7=Y_7, Y_6Ti_1 or Zr_{2.5}Hf_{2.5}W_2) alloys are investigated. The bulk amorphous Fe_{61}Co_{10}Zr_{2.5}Hf_{2.5}W_2Y_2B_{20} alloy exhibits the best thermal stability and remains amorphous up to 901 K. Moreover, the quasi-dislocations dipoles present in this amorphous alloy have the largest width equal to 6.7 nm. After annealing this alloy below the crystallization temperature the enhancement of both the average hyperfine field and its standard deviation is observed which points to the increase in the atom packing density due to the decay of quasi-dislocation dipoles. After the annealing at 901 K the small amount of the crystalline α-FeCo phase is presented in this alloy. The same crystalline phase appears in the bulk Fe_{61}Co_{10}Y_8Ti_1B_{20} and Fe_{61}Co_{10}Y_9B_{20} alloys after annealing at 750 K and 840 K, respectively.
7
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Effect of Dielectric Medium Anisotropy on the Polarization Degree of Emission from a Single Quantum Dash

52%
Mrowiński P., Tarnowski K., Olszewski J., Somers A., Kamp M., Höfling S., Reithmaier J., Urbańczyk W., Misiewicz J., Machnikowski P., Sęk G.
Acta Physica Polonica A
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2016
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vol. 129
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issue 1a
A-48-A-52
EN
Excitonic emission from single InAs/InGaAlAs/InP quantum dashes has been investigated in the context of degree of linear polarization by post-growth modification of its surrounding dielectric medium. We present optical spectroscopy measurements on a symmetric squared pedestal structures (mesas), and asymmetric rectangular ones oriented parallel or perpendicular to the main in-plane axis of the dashes [1-10]. Polarization resolved microphotoluminescence shows a significant quantitative modification of the degree of linear polarization value from -20% up to 70%. These results have been confronted with calculations of the coupling between the exciton transition dipole moment and electromagnetic field distributed in the vicinity of a quantum dash inside a processed mesa.
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