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Wyświetlanie 1-15 z 91
Tytuł:
Multiple Exciton Generation in InAs Nanocrystals
Autorzy:
Kowalski, P.
Machnikowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/1811947.pdf
Data publikacji:
2008-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.67.Bf
73.22.Dj
Opis:
We study a simple theoretical model of multiple exciton generation by a single high-energy photon absorbed in an InAs nanocrystal. We calculate the Coulomb matrix element for the electron-trion coupling in an InAs nanocrystal and show that due to the resulting coupling between single-pair and two-pair states the latter becomes weakly optically active.
Źródło:
Acta Physica Polonica A; 2008, 114, 5; 1187-1192
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comprehensive Analysis of Ion Beam Induced Stainless Steel Surface Morphology
Autorzy:
Kowalski, Z.
Powiązania:
https://bibliotekanauki.pl/articles/1503932.pdf
Data publikacji:
2011-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
79.20.Rf
Opis:
Surface morphology, one of the various physical properties modified by ion beam irradiation, is usually characterized by well known and very often investigated surface topography and surface roughness. The paper presents two additional aspects of surface morphology modification (called by the author: profile variability and surface morphology arrangement) that seem to be good complementary indicators of morphology changes. Surface micro- and nanotopographies were observed by means of scanning electron and near-field microscopes. High quality profilograph and atomic force microscope were utilised to measure main selected roughness parameters (based on the well known surface profiles). To detect any profile shape alteration during ion beam bombardment fractal analysis was used, and especially fractal dimension D that can give information about a rate $p_{v}$ of profile shape variability. Surface morphology arrangement, i.e. a question whether it is random or determined, was studied with the use of frequency plots resulting from harmonic analysis of profiles. Surface topographies, selected roughness parameters, fractal dimensions and frequency plots relating to stainless steel of 1H18N9T (made in Poland) bombarded with perpendicular (Θp = 0°) as well as very inclined (Θp = 85-87°) beam were examined. Low energy (0.8 keV) broad argon ion beam and neutralized narrow argon or krypton ion beams (up to 6 keV) were used in the experiments.
Źródło:
Acta Physica Polonica A; 2011, 120, 1; 70-74
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Measurement Stand for TeraEYE Inspection
Autorzy:
Piszczek, M.
Kowalski, M.
Szustakowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/1493257.pdf
Data publikacji:
2011-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
02.60.-x
42.30.Tz
42.30.Sy
Opis:
Image fusion can be used as one of imaging methods. Connection of images acquired using different acquisition methods can deliver information invisible for traditional one imaging technique. Visible and thermal images connected in one image give information about shapes and temperature map of objects seen by cameras. If we connect stereoscopic visible image and thermal image we will have three-dimensional object model covered with temperature map. Dividing three-dimensional objects on elementary surfaces we can model this object energetically. Energetic modeling of measurement scene allows verifying measurement data acquired from devices working in terahertz frequency range. This method requires many measurement scene parameters to be registered. Some of these parameters can be used in a hybrid modelling process.
Źródło:
Acta Physica Polonica A; 2011, 120, 4; 720-724
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Quantum Key as the Fiber Optic Security Sensor
Autorzy:
Życzkowski, M.
Kowalski, M.
Powiązania:
https://bibliotekanauki.pl/articles/1399414.pdf
Data publikacji:
2013-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.30.Sy
02.60.-x
42.30.Tz
Opis:
The paper describes the methodology of identifying an interference in the optical fiber. The paper presents the technology widely known as quantum key distribution. The quantum key distribution is based on the technique of constant comparison of quantum characteristics of the input light source and its characteristics at the end of the fiber optic. Methodology of presented work includes the evaluation of the functional objectives through the constructive assumptions for the laboratory models development. This paper presents the model of a system based on the comparison of polarization states of light quanta using two asymmetric Mach-Zender interferometers as transmitting and receiving systems to enable compensation of polarization state changes at the input and output of the fiber optics sensing cable. Continuous monitoring of the state of the reference signal, the specific changes of natural or ambient effects on the fiber will attempt to identify interference in the optical waveguide as a change of the polarization of the quantum states of the light. The authors indicate the possibility of using such fiber optic sensor as a security sensor to protect the extensive critical infrastructure facilities. In this article the future research conception of using compressed sensing algorithms for data compression in quantum key distribution systems is presented.
Źródło:
Acta Physica Polonica A; 2013, 124, 3; 606-609
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electronic Band Structure of Cubic HgS
Autorzy:
Guziewicz, E.
Kowalski, B.
Orłowski, B. A.
Dybko, K.
Witkowska, B.
Szuszkiewicz, W.
Powiązania:
https://bibliotekanauki.pl/articles/1873013.pdf
Data publikacji:
1995-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.Fi
Opis:
Reflectivity spectra of Hg$\text{}_{1-x}$Fe$\text{}_{x}$S (x < 0.04) and HgSe$\text{}_{1-y}$S$\text{}_{y}$ (y < 0.5) mixed crystals were measured in the vacuum ultraviolet energy range from 4 to 12 eV. Information about the electronic band structure of cubic modification of HgS resulting from the above data is analyzed and discussed.
Źródło:
Acta Physica Polonica A; 1995, 87, 2; 395-398
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
SiO$\text{}_{2}$ Layer Charge State Variation in Fowler-Nordheim Tunneling Regime
Autorzy:
Strzałkowski, I.
Kowalski, M.
Powiązania:
https://bibliotekanauki.pl/articles/1967939.pdf
Data publikacji:
1997-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.20.Jv
73.40.Qv
Opis:
The charge build-up and its changes in the amorphous SiO$\text{}_{2}$ layer incorporated into a Si MOSFET as a gate oxide due to Fowler-Nordheim tunneling electron injection were investigated. Electron and hole trapping/detrapping by native and generated trap centres were studied by monitoring the charge state of the SiO$\text{}_{2}$ traps by means of a drain-source current versus gate-source voltage technique. New interesting effects were observed and their possible mechanisms are presented.
Źródło:
Acta Physica Polonica A; 1997, 92, 3; 585-590
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reflectivity Study of HgSe$\text{}_{1-x}$Te$\text{}_{x}$ Crystals
Autorzy:
Kowalski, B. J.
Dybko, K.
Lemańska, A.
Orłowski, B. A.
Powiązania:
https://bibliotekanauki.pl/articles/1923860.pdf
Data publikacji:
1992-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.20.Ci
Opis:
The room temperature reflectivity spectra of HgSe$\text{}_{1-x}$Te$\text{}_{x}$ (x = 0, 0.4, 0.5, 1.0) crystals were measured in the visible and ultraviolet range from 1.5 to 12 eV. The maxima characteristic of the binary HgA$\text{}^{IV}$ compounds can be revealed in the mixed crystals spectra, but their position depends on the crystal composition. There is no duplication of the spectral features in spite of the different energy position of the maxima for HgSe and HgTe. This suggests that the virtual crystal approximation could be used to describe basic optical properties of HgSe$\text{}_{1-x}$Te$\text{}_{x}$.
Źródło:
Acta Physica Polonica A; 1992, 82, 5; 845-848
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reflectivity Study of Hg$\text{}_{1-x}$Co$\text{}_{x}$Se Crystals
Autorzy:
Guziewicz, E.
Kowalski, B. J.
Orłowski, B. A.
Szuszkiewicz, W.
Powiązania:
https://bibliotekanauki.pl/articles/1931782.pdf
Data publikacji:
1994-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.Fi
Opis:
The reflectivity spectra of Hg$\text{}_{1-x}$Co$\text{}_{x}$Se (x = 0.0, 0.024, 0.031) crystals were measured in the vacuum ultraviolet photon energy range from 4 to 12 eV to find the influence of Co ions on the valence band electronic structure of the HgSe crystal. The structure of the reflectivity spectra was interpreted in terms of the electronic band structure of the binary material (HgSe) assuming direct allowed interband transitions.
Źródło:
Acta Physica Polonica A; 1994, 86, 5; 875-878
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of the Process of Coal Micronization Conducted in Order to Obtain Coal-Water Liquids
Autorzy:
Staroń, A.
Kowalski, Z.
Banach, M.
Powiązania:
https://bibliotekanauki.pl/articles/1375618.pdf
Data publikacji:
2014-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
82.70.Kj
Opis:
Coal is the most important energy source, but its application in traditional way causes pollution. Preparation of coal-water liquids consists of: initial crushing of coal, wet milling in mixer mill and homogenization. To obtain coal-water liquids there were used three kinds of materials: coal of medium assortment with a low content of ash (6-25 mm), fine coal (0-20 mm) and coal sludge. The parameters of the grinding process which results in coal-water suspensions characterized by the most advantageous functional properties (high stability, low density and viscosity and the smallest equivalent diameter of particles of coal in a slurry) have been chosen and the influence of additives on the listed properties of the suspensions was determined. For suspensions consisted of water and coal independent parameters were vibration frequency 30 1/s, one ball with diameter of 15 mm and amount of water: 70 wt%. Substances which were applied to improve the properties of coal-water suspensions were: Triton X-405, sodium carboxymethyl cellulose and poly(acrylic acid), partial sodium salt-graft-poly(ethylene oxide). The best stability, low viscosity and the lowest density of the suspensions were characterized by coal, water and 0.1 wt% of carboxymethyl cellulose as a result of the 30 min milling.
Źródło:
Acta Physica Polonica A; 2014, 126, 4; 1025-1028
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reflectivity Study of the Zn$\text{}_{1-x}$Co$\text{}_{x}$Se Crystals
Autorzy:
Kowalski, B. J.
Gołacki, Z.
Orłowski, B. A.
Powiązania:
https://bibliotekanauki.pl/articles/1890987.pdf
Data publikacji:
1991-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.20.Ci
Opis:
The room temperature reflectivity spectra of the Zn$\text{}_{1-x}$Co$\text{}_{x}$Se (x = 0, 0.03, 0.05) crystals have been measured in the visible and ultraviolet range from 1.7 to 12 eV. The structure of the spectra was interpreted in terms of the electronic band structure of the binary material (ŻnSe). The experimental results were compared with the reflectivity spectra of the Fe-based semi magnetic semiconductors [1], and the interpretation was confronted with the conclusions derived from the photoemission experiments performed for Cd$\text{}_{1-x}$Co$\text{}_{x}$Se [2] and the tight-binding CPA calculations of the band structure of Zn$\text{}_{1-x}$Co$\text{}_{x}$Se [3].
Źródło:
Acta Physica Polonica A; 1991, 80, 3; 393-396
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Visible Luminescence from Porous Silicon
Autorzy:
Bała, W.
Firszt, F.
Nossarzewska-Orłowska, E.
Brzozowski, A.
Orłowski, B. A.
Kowalski, B. J.
Guziewicz, E.
Powiązania:
https://bibliotekanauki.pl/articles/1929748.pdf
Data publikacji:
1993-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.66.-w
Opis:
This paper presents results of investigation of the temperature dependence of visible luminescence in porous silicon layers prepared by anodization in hydrofluoric acid. Luminescence spectra were measured in the temperature range between 40 K and 350 K. Room temperature reflectivity spectra were also measured in vacuum ultraviolet radiation range from 4 eV to 12 eV.
Źródło:
Acta Physica Polonica A; 1993, 84, 4; 761-764
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Atmospheric Pressure Plasma Jet for Mass Spectrometry
Autorzy:
Babij, M.
Gotszalk, T.
Kowalski, Z.
Nitsch, K.
Silberring, J.
Smoluch, M.
Powiązania:
https://bibliotekanauki.pl/articles/1198872.pdf
Data publikacji:
2014-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
52.50.Dg
82.80.Ms
Opis:
The atmospheric pressure plasma is much advantageous over low pressure plasmas in various aspects, e.g. vacuum-free operation, relative low cost, flexibility of a continuous process. Among various plasmas generated in atmospheric pressure discharges there are cold plasma jets that represent a technology of great application promise (industry, medicine, biology). To generate low-temperature plasmas at atmospheric pressure the dielectric barrier discharge can be used. It is suitable for the atomization of volatile species and can also be served as a ionization source for ambient mass and ion mobility spectrometry. As the discharge is generated in a restricted electrode structure, a plasma jet (plume) is usually formed outside the electrode region (that provides spatial separation of the plasma generation and surface processing regions). The paper presents a source based on a plasma jet established at the end of a capillary dielectric barrier discharge at atmospheric pressure and its application to mass spectrometry. The structure of the jet generator consists of piezoelectric transformer and two concentric and symmetric electrodes, between which the working gas flows at definite rate. Besides the source description early results of spectroscopic analysis are also given.
Źródło:
Acta Physica Polonica A; 2014, 125, 6; 1260-1262
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Surface Related Electronic States on CdTe(110) Observed by Means of Optical Spectroscopy
Autorzy:
Kowalski, B. J.
Orłowski, B. A.
Cricenti, A.
Powiązania:
https://bibliotekanauki.pl/articles/1934063.pdf
Data publikacji:
1995-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.20.-r
78.66.Hf
Opis:
Surface differential reflectivity together with photoemission and Auger electron spectroscopies have been applied to observe and identify optical transitions among surface related states on CdTe(110) surfaces. The strongest contributions to the band of optical transitions have been revealed at the photon energies of 2.8, 3.4, and 3.9 eV. Their correspondence to excitations from the occupied S1 band to the unoccupied U1 one at the Γ, Χ and Χ' points of the surface Brillouin zone is discussed.
Źródło:
Acta Physica Polonica A; 1995, 88, 5; 1005-1009
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of phase transformations in inconel 625 alloy during annealing
Autorzy:
Petrzak, P.
Kowalski, K.
Blicharski, M.
Powiązania:
https://bibliotekanauki.pl/articles/1152530.pdf
Data publikacji:
2016-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.66.Dk
64.75.Nx
81.05.Bx
81.30.Fb
Opis:
The investigation focused on the characterization of the microstructure and chemical composition changes after annealing. The research was conducted on the Inconel 625 weld overlay deposited on a boiler steel. The annealing was performed for 10 h at temperatures from 600 to 1000°C. The microstructure and chemical composition were examined by scanning electron microscope and transmission electron microscope equipped with an energy dispersive X-ray spectrometer. Weld overlays were produced by an innovative method of cold metal transfer.
Źródło:
Acta Physica Polonica A; 2016, 130, 4; 1041-1044
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electronic Structure of Diluted Semimagnetic Semiconductor (Cd,Co)Se
Autorzy:
Cháb, V.
Mašek, J.
Orłowski, B. A.
Kowalski, B. J.
Powiązania:
https://bibliotekanauki.pl/articles/1890829.pdf
Data publikacji:
1991-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.10.Lp
75.50.Pp
79.60.Eq
Opis:
The electronic structure of a new semimagnetic semiconductor (Cd,Co)Se is studied by UPS and calculated by a tight-binding version of the disordered-local-moment theory. The theory accounts for the chemical disorder and for electron interactions within the Co 3d$\text{}^{7}$ shells. Both theory and experiment show Co 3d states deep in the valence band and also at the band edge. The last state seem to be responsible for unique properties of the Co-based semimagnetic semiconductors.
Źródło:
Acta Physica Polonica A; 1991, 80, 3; 333-336
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 91

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