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Tytuł:
s-p-d-f Exchange Interactions in Mn and Eu Based IV-VI Semimagnetic Semiconductors
Autorzy:
Dietl, T.
Bauer, G.
Powiązania:
https://bibliotekanauki.pl/articles/1921647.pdf
Data publikacji:
1992-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.70.Gm
Opis:
We evaluated exchange integrals which describe the spin dependent coupling between effective mass electrons and localized spins in the IV-VI semi-magnetic semiconductors taking into account contributions from the direct Coulomb exchange as well as from the hybridization between band states and magnetic shells. The obtained constants compare favorably with the experimental values for both the Mn- and the Eu-based compounds. We also discuss some peculiarities of IV-VI semimagnetic semiconductors, which may render the virtual-crystal approximation invalid.
Źródło:
Acta Physica Polonica A; 1992, 82, 5; 729-732
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Radio wave propagation and single-cell coverage prediction of broadband radio access systems including passive reflectors
Autorzy:
Bauer, G.
Freese, J.
Jakoby, R.
Powiązania:
https://bibliotekanauki.pl/articles/308364.pdf
Data publikacji:
2001
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
millimeter wave propagation
LMDS
coverage prediction
passive reflectors
Opis:
This paper presents the scheme of a software planing tool for single microcells of broadband radio access systems operating at millimeter waves, providing local multipoint distribution services (LMDS), particularly in urban or suburban areas. The aim of this planing tool is to provide operators with information, which supports the assessment of the profitability by calculating link budgets and the area coverage and by roughly estimating the maximum number of potential customers, i.e. the total number of households in a certain area, as well as the number of customers (households) which will actually be covered from a site. A household is here considered as a single apartment or flat, thus a building usually consists of several households. This novel household-estimation model is able to estimate the number of households based only on the 3D-data of buildings, without using residential data. Besides the optimization of line-of-sight (LOS) coverage, also the possibility is considered to enhance the coverage into shadowed areas by using optimized reflectors as passive repeaters up to distances of 1 km from the base station, depending on the system margin and the rain climate zone. All calculations are based on 3D-databases of both, buildings and vegetation.
Źródło:
Journal of Telecommunications and Information Technology; 2001, 2; 21-30
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
High Resolution X-ray Reciprocal Space Mapping
Autorzy:
Bauer, G.
Li, J. H.
Holy, V.
Powiązania:
https://bibliotekanauki.pl/articles/1943985.pdf
Data publikacji:
1996-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.10.-i
68.55.-a
61.72.Lk
Opis:
A survey will be given on recent advances in the investigation of semiconductor epilayers, heterostructures and superlattices using reciprocal space mapping techniques based on triple-axis diffractometry. It is shown that X-ray reciprocal space mapping yields quantitative information on strain, strain relaxation, as well as composition in such structures. These data are obtained from analyses of the isointensity contours of scattered X-ray intensity around reciprocal lattice points. Further analysis of the diffuse scattering yields also information on defect distribution in the epilayers.
Źródło:
Acta Physica Polonica A; 1996, 89, 2; 115-127
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Scattering Theory of the Johnson Spin Transistor
Autorzy:
Geux, L. S.
Brataas, A.
Bauer, G. A.
Powiązania:
https://bibliotekanauki.pl/articles/2011231.pdf
Data publikacji:
2000-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.40.Gk
73.23.Hk
75.70.Pa
Opis:
We discuss a simple, semiclassical scattering theory for spin-dependent transport in a many-terminal formulation, with special attention to the four terminal device of Johnson referred to as spin transistor.
Źródło:
Acta Physica Polonica A; 2000, 97, 1; 119-128
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Two-dimensional and dynamic method of visualization of the flow characteristics in a convection boundary layer using infrared thermography
Autorzy:
Patorski, J. A.
Bauer, G. S.
Dementjev, S.
Powiązania:
https://bibliotekanauki.pl/articles/279681.pdf
Data publikacji:
2001
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
IR-thermography measurement
visualization of internal flow within convection boundary layer
heat transfer visualization
Opis:
The paper presents a two-dimensional and dynamic (2DD) method of using infrared thermography (IRT) for visualization of the cooling efficiency of a heated wall, as this method was applied in an experimental investigation. The 2DD method allows the outer surface temperature measured by an IRT device to be worked out relative to the bulk coolant-fluid temperature. This way the 2DD method makes visible the qualitative and quantitative flow characteristics within the thin contact layer at the inner surface of the wall. These flow characteristics, and more specifically, the pattern of the flow (similar to streamlines useful for the detection of dead zones) and the distribution of the temperature differences between the temperature on the wall outer surface and the bulk temperature of the coolant, determine the cooling efficiency. Finally, animated IR thermogram sequences could be generated, allowing observation of the spatial and temporal behavior of the flow/cooling behind the wall, for an example see animations in internet page (Patorski, 2000). The study of the cooling of the proton beam entry window described in this paper is a part of the development program of neutron spallation sources with liquid metal targets. The basic idea of the experiments was to use the real interacting materials (mercury as the liquid metal and steel as the window wall) and observe the cooling effects of the mercury flow on the heated wall of the hemispherical shell of the mockup window. Different geometrical configurations of the inner flow guide tubes of the flow and different pumping velocities were examined in view of finding the optimal cooling solution.
Dwuwymiarowa dynamiczna metoda wizualizacji charakterystycznych właściwości przepływu w konwekcyjnej warstwie granicznej przy użyciu termowizji. Artykuł przedstawia, na przykładzie zastosowania w badaniach doświadczalnych, dwuwymiarową dynamiczną (2DD) metodę użycia termowizji (IRT) wizualizującą efektywność chłodzenia przepływem cieczy silnie ogrzewanej ścianki zbiornika. Wykorzystanie zsynchronizowanych pomiarów: temperatury zewnętrznej powierzchni ścianki zbiornika (za pomocą IRT) oraz temperatury masy płynącej cieczy (za pomocą termoelementów (TC)), pozwoliło na wizualizację jakościowych i ilościowych zjawisk przepływu cieczy charakteryzujących efektywność chłodzenia ścianki. Do zjawisk jakościowych zaliczono tu wizualizację obrazów przepływu; w przybliżeniu obrazów lini przepływu w pobliżu ścianki, ponieważ pola temperatur w dominującym stopniu zależą od rozkładu prędkości przepływu. Obrazy takie dają możliwość wykrycia zawirowań czy tzw. "marwych" stref przepływu występujących po niewidocznej stronie nieprzeźroczystej ścianki. Do zjawisk ilościowych zaliczono wizualizację pola rozkładu wartości różnicy temperatur pomiędzy ścianką a masą płynącej cieczy; mniejsze wartości tej różnicy wskazują lepszą lokalną efektywność chłodzenia. Wartość tej różnicy temperatur może być bezpośrednio skorelowana z konwekcyjnym współczynnikiem przekazywania ciepła. Pokazanie animacji w postaci sekwencji tak specyficznie zdefiniowanych pól temperatur pozwala na geometryczno-czasową (dynamiczną) ocenę efektywności chłodzenia ścianki zbiornika dla różnych konfiguracji wewnętrznego przepływu cieczy. Dla przykładu, na stronie internetu (Patorski,2000) pokazano dwie animacje dotyczące eksperymentów omawianych w artykule. Przedstawione badania doświadczalne służą wyborowi optymalnej konfiguracji przepływu rtęci dla chłodzenia ścianki stalowego zbiornika źródła neutronów, tzw. "okna" wejścia wiązki protonów, podczas wytwarzania neutronów z jąder atomów ciężkich metali w procesie spallacji. W omawianym przypadku rtęć będzie jednocześnie wykorzystywana do wytwarzania neutronów, jak i do chłodzenia stalowej ścianki naczynia źródła neutronów. Z punktu widzenia analizy naprężeń termo-mechanicznych w ściance "okna" zbiornika źródła neutronów było koniecznym doświadczalne zbadanie charakterystyki konwekcyjnego przekazywania ciepła z użyciem przewidywanych do zastosowania materiałów (stal i rtęć), z zastosowaniem realnych kształtów i wymiarów zbiornika źródła neutronów (cylinder zakończony półkulą) oraz wewnętrznych geometrycznych i hydraulicznych warunków przepływu rtęci.
Źródło:
Journal of Theoretical and Applied Mechanics; 2001, 39, 2; 353-376
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Strain Relaxation Induced Red Shift of Photoluminescence of CdZnSe/ZnSe Quantum Wires
Autorzy:
Straub, H.
Brunthaler, G.
Faschinger, W.
Bauer, G.
Vieu, C.
Powiązania:
https://bibliotekanauki.pl/articles/1952705.pdf
Data publikacji:
1996-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.55.Et
Opis:
Wire patterns (80-1000 nm) of molecular beam epitaxy grown Cd$\text{}_{0.2}$Zn$\text{}_{0.8}$Se/ZnSe quantum well were fabricated by a CH$\text{}_{4}$/H$\text{}_{2}$ reactive ion etching technique. Photoluminescence emission shows with decreasing lateral size a broadening of line shape and a spectral red shift. Calculations for the change of the band gap due to strain relaxation show that this shift of the photoluminescence emission for narrow Cd$\text{}_{0.2}$Zn$\text{}_{0.8}$Se/ZnSe structures (lattice mismatch of 1.34%) can be explained by a partial elastic strain relaxation of the biaxially compressively strained Cd$\text{}_{0.2}$Zn$\text{}_{0.8}$Se quantum well after the patterning process.
Źródło:
Acta Physica Polonica A; 1996, 90, 5; 1085-1089
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of Morphology and Chemical Composition of Self-Organized Semiconductor Quantum Dots and Wires by X-Ray Scattering
Autorzy:
Holý, V.
Meduňa, M.
Stangl, J.
Roch, T.
Bauer, G.
Powiązania:
https://bibliotekanauki.pl/articles/2030767.pdf
Data publikacji:
2002-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.10.-i
61.10.Dp
Opis:
X-ray scattering methods suitable for the investigation of the morphology and chemical composition of self-organized quantum dots and quantum wires are reviewed. Their application is demonstrated in experimental examples showing that a combination of small angle X-ray scattering with high-resolution X-ray diffraction can reveal both the shape and the chemical composition of the self-organized objects.
Źródło:
Acta Physica Polonica A; 2002, 102, 1; 7-19
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Weak Localization and Electron-Electron Interaction in Si/SiGe Quantum Wells
Autorzy:
Prinz, A.
Stőger, G.
Brunthaler, G.
Bauer, G.
Ismail, K.
Meyerson, B. S.
Powiązania:
https://bibliotekanauki.pl/articles/1933957.pdf
Data publikacji:
1995-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.20.Fz
Opis:
A negative magnetoresistance is observed in Si/SiGe modulation doped heterostructures which is attributed to the single particle quantum interference (weak localization) effect. From analysis of the experimental data the electron phase coherence time τ$\text{}_{ϕ}$ is extracted to follow a (aT + bT$\text{}^{2}$ )$\text{}^{-1}$ dependence. The evaluated prefactor α = 0.25 is below the theoretical limit of 0.5, but agrees with observations in Si and GaAs/AlGaAs heterostructures.
Źródło:
Acta Physica Polonica A; 1995, 88, 5; 873-876
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
High Resolution X-Ray Diffraction Investigations of Si/SiGe Quantum Well Structures and Si/Ge Short-Period Superlattices
Autorzy:
Bauer, G.
Koppensteiner, E.
Hamberger, P.
Nützel, J.
Abstreiter, G.
Kibbel, H.
Presting, H.
Kasper, E.
Powiązania:
https://bibliotekanauki.pl/articles/1929613.pdf
Data publikacji:
1993-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.65.+g
61.10.-i
68.55.Jk
Opis:
Double crystal and triple axis X-ray diffractometry was used to characterize the structural properties of Si/Si$\text{}_{1-x}$Ge$\text{}_{x}$ multiquantum well samples grown pseudomorphically on Si(001) substrates, as well as of short-period Si$\text{}_{9}$Ge$\text{}_{6}$ superlattices grown by molecular beam epitaxy on rather thick step-graded Si$\text{}_{1-x}$Ge$\text{}_{x}$ (0 < x < 0.4, 650 nm thick) buffers followed by 550 nm Si$\text{}_{0.6}$ Ge$\text{}_{0.4}$ layers. Reciprocal space maps around the (004) and (224) reciprocal lattice points yield direct information on the strain status of the layers in the heterostructure systems and in particular on the amount of strain relaxation.
Źródło:
Acta Physica Polonica A; 1993, 84, 3; 475-489
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of Ballistic Transport in Wires of n-PbTe
Autorzy:
Grabecki, G.
Wróbel, J.
Dietl, T.
Papis, E.
Kamińska, E.
Piotrowska, A.
Ueta, Y.
Sprinholtz, G.
Bauer, G.
Powiązania:
https://bibliotekanauki.pl/articles/1968110.pdf
Data publikacji:
1997-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.61.-r
73.23.Ad
73.50.Dn
Opis:
We present results of magnetotransport studies on quantum wires of submicron PbTe epilayers, fabricated by means of electron beam lithography and dry etching. When the wire width is reduced down to 1 μm, the transition from diffusive to ballistic regime is observed. Effects associated with collimation and boundary scattering are found in the Hall, longitudinal, and van der Pauw magnetoresistance for wires and junctions in the shape of a cross.
Źródło:
Acta Physica Polonica A; 1997, 92, 4; 789-792
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electron Localization in Sb-Doped Si/SiGe Superlattices
Autorzy:
Dietl, T.
Jaroszyński, J.
Sawicki, M.
Głód, P.
Wróbel, J.
Stöger, G.
Brunthaler, G.
Bauer, G.
Schäffler, F.
Powiązania:
https://bibliotekanauki.pl/articles/1933732.pdf
Data publikacji:
1995-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.61.Cw
72.15.Rn
73.20.Fz
Opis:
Millikelvin studies of in-plane magnetoconductance in short period Si/Ge:Sb superlattices have been carried out in order to examine the effect of anisotropy on quantum localization. The field-induced metal-to-insulator transition has been observed, indicating the existence of extended states. This suggests that despite anisotropy as large as D $\text{}_{∥}$/D$\text{}_{⊥}$ ≈ 10$\text{}^{3}$ the system behaves as 3D in respect of localization by disorder.
Źródło:
Acta Physica Polonica A; 1995, 88, 4; 699-702
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mesoscopic Phenomena in Microstructures of IV-VI Epilayers
Autorzy:
Grabecki, G.
Dietl, T.
Plesiewicz, W.
Lenard, A.
Skośkiewicz, T.
Kamińska, E.
Piotrowska, A.
Papis, E.
Frank, N.
Bauer, G.
Powiązania:
https://bibliotekanauki.pl/articles/1877113.pdf
Data publikacji:
1995-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.55.Jv
Opis:
Magnetoresistance measurements of photolithographically patterned PbSe and Pb$\text{}_{1-y}$Mn$\text{}_{x}$Se microstructures were performed. Reproducible magnetoconductance fluctuations with the amplitude increasing with decreasing temperature were observed. Unexpectedly, these fluctuations contain a component periodic in the magnetic field, and their magnitude is greater than that expected from the current theory of the universal conductance fluctuations. Possible explanations are discussed.
Źródło:
Acta Physica Polonica A; 1995, 87, 2; 551-554
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Conductance Fluctuations in PbSe: Manifestation of Ballistic Transport in Macroscale?
Autorzy:
Grabecki, G.
Takeyama, S.
Adachi, S.
Takagi, Y.
Dietl, T.
Kamińska, E.
Piotrowska, A.
Papis, E.
Frank, N.
Bauer, G.
Powiązania:
https://bibliotekanauki.pl/articles/1933748.pdf
Data publikacji:
1995-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.55.Jv
Opis:
Precise magnetoresistance measurements on microstructures of photolithographically patterned PbSe epilayers have been performed in the magnetic field range up to 17 Τ. Unusually large, reproducible magnetoconductance fluctuations have been observed. The fluctuation amplitude decreases exponentially with the magnetic field. A correlation magnetic field of the fluctuations corresponds to the Aharonov-Bohm effect which involves electron trajectories much smaller than the electron mean free path. This points strongly to the ballistic, not diffusive, origin of the observed phenomenon.
Źródło:
Acta Physica Polonica A; 1995, 88, 4; 727-730
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Second Harmonic Generation in Spin-Glass Microstructures and Fabrication of Microstructures in IV-VI Epilayers
Autorzy:
Grabecki, G.
Dietl, T.
Cieplak, Marek
Plesiewicz, W.
Lenard, A.
Skośkiewicz, T.
Kamińska, E.
Piotrowska, A.
Żarecka, R.
Springholz, G.
Bauer, G.
Powiązania:
https://bibliotekanauki.pl/articles/1929753.pdf
Data publikacji:
1993-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.55.Jv
Opis:
We studied magnetoconductance of two different mesoscopic systems: microregions containing two-dimensional electron gas adjacent to a grain-boundary plane in bicrystals of Hg$\text{}_{0.79}$Cd$\text{}_{0.19}$Mn$\text{}_{0.02}$Te and photolithographically patterned microstructures of Pb$\text{}_{1-x}$Mn$\text{}_{x}$Se. In both systems universal conductance fluctuations and generation of the second-harmonic voltage were observed at T ≤ 1 K. Moreover, in the former system the second harmonic signal exhibited distinct rise when the sample was cooled below the spin-glass freezing temperature (100 mK).
Źródło:
Acta Physica Polonica A; 1993, 84, 4; 781-784
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Conductance Anomalies in Strained Quantum Wires: the Case of PbSe and PbTe
Autorzy:
Grabecki, G.
Wróbel, J.
Dietl, T.
Sawicki, M.
Skośkiewicz, T.
Papis, E.
Kamińska, E.
Piotrowska, A.
Frank, N.
Ueta, Y.
Sprinholtz, G.
Bauer, G.
Powiązania:
https://bibliotekanauki.pl/articles/1950800.pdf
Data publikacji:
1996-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.55.Jv
Opis:
We show that conducting edge channels are formed in free standing wires of PbSe/BaF$\text{}_{2}$ and PbTe/BaF$\text{}_{2}$ as temperature is lowered. The effect results from spatially inhomogeneous strain caused by a difference between the thermal expansion coefficients of the epilayer and the substrate. The presence of the edge channels can explain anomalous mesoscopic effects observed previously in these wires.
Źródło:
Acta Physica Polonica A; 1996, 90, 4; 797-800
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dr G. K. Pietruszewski (8.I.1901-28.XII.1958)
Dr G. K. Petroushevsky (pro memoria)
Dokt. G. K. Petrushevskijj (posmertnoe vospominanie)
Autorzy:
Bauer, O.N.
Powiązania:
https://bibliotekanauki.pl/articles/840117.pdf
Data publikacji:
1959
Wydawca:
Polskie Towarzystwo Parazytologiczne
Źródło:
Annals of Parasitology; 1959, 05, 6
0043-5163
Pojawia się w:
Annals of Parasitology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Czochralski Growth of Decagonal AlCoNi Quasicrystals from Al-rich Solution
Autorzy:
Meisterernst, G.
Bauer, B.
Gille, P.
Powiązania:
https://bibliotekanauki.pl/articles/1399479.pdf
Data publikacji:
2013-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.44.Br
81.10.Aj
Opis:
Czochralski growth of cm size decagonal AlCoNi single crystals from Al-rich high-temperature solutions is described using native seeds oriented parallel to all symmetrically different crystal directions. Morphological observations allow first hints with respect to anisotropic growth rates. But only classical detachment experiments according to the original idea of Jan Czochralski reveal quantitative results of kinetically limited growth rates. Geometric conditions of wetted plane interfaces as well as aspects of constitutional supercooling affect the detachment experiments. Thus, in only one specific orientation of the decagonal quasicrystal quantitative data for the maximum growth rate could be obtained.
Źródło:
Acta Physica Polonica A; 2013, 124, 2; 344-349
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Non-rigid registration using hardware-accelerated free-form deformation
Autorzy:
Soza, G.
Bauer, M.
Hastreiter, P.
Nimsky, C.
Greiner, G.
Powiązania:
https://bibliotekanauki.pl/articles/332958.pdf
Data publikacji:
2002
Wydawca:
Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
Tematy:
przesunięcie mózgu
rejestracja
sprzęt graficzny
brain shift
registration
free-form deformation
graphics hardware
Opis:
In this paper we introduce a new method for non-rigid voxel-based registration of medical images. There exist many applications where an alignment between two image datasets has to be established. Often a registration of a time-shifted medical image sequence with appearing deformation of soft tissue (e.g. pre- and intraoperative data) has to be conducted. Soft tissue deformations are usually highly non-linear. In our approach, for the handling of this phenomenon and for obtaining an optimal non-linear alignment of respective datasets we transform one of them using 3D Bézier functions, which provides some inherent smoothness as well as elasticity. In order to find the optimal transformation, many evaluations of this Bézier function are necessary. In order to make the method more efficient, graphics hardware is extensively used. We applied our non-rigid algorithm successfully to MR brain images in several clinical cases and showed its value.
Źródło:
Journal of Medical Informatics & Technologies; 2002, 3; MI181-188
1642-6037
Pojawia się w:
Journal of Medical Informatics & Technologies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mapping of mosquito (Culicidae) breeding sites using predictive geographic information methods
Autorzy:
Szabo, S.
Kenyeres, Z.
Bauer, N.
Gosztonyi, G.
Saringer-Kenyeres, T.
Powiązania:
https://bibliotekanauki.pl/articles/87816.pdf
Data publikacji:
2008
Wydawca:
Polskie Towarzystwo Geograficzne
Tematy:
mosquito
Culicidae
GIS
remote sensing
prediction
Opis:
Application of remote sensing and other GIS methods in the subject of mapping mosquito breeding sites has not been premised accordingly. Despite the facts that the duration of field surveys would be shortened and the effectiveness of action plans would be higher with the supportance of computer modelling techniques. This work aimed to evaluate the applicability of digital elevation models and aerial photographs in the prediction of mosquito breeding sites. Relief analysis was carried out seeking depressions based on elevation models created with TIN and kriging interpolation methods. Spectral analysis was performed on aerial photographs to identify the patches of higher water content or moisture. The results show that terrain analysis can not give acceptable results due to its resolution and accuracy. Spectral analysis of normal (visible range) photographs can be a useful tool in predicting of breeding sites. On grasslands the verificitaion revealed 91% correct results.
Źródło:
Prace Komisji Krajobrazu Kulturowego; 2008, 8; 255-270
1896-1460
2391-5293
Pojawia się w:
Prace Komisji Krajobrazu Kulturowego
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Use of image data in rapid mapping
Autorzy:
Sanecki, J.
Klewski, A.
Stępień, G.
Beczkowski, K.
Bauer, R.W.
Powiązania:
https://bibliotekanauki.pl/articles/359834.pdf
Data publikacji:
2014
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
remote sensing
rapid mapping
image map
unmanned aerial systems (UAS)
Opis:
The topic of the publication is the presentation of the method of rapid mapping performation. Rapid mapping are performed in special situations, if a terrain is subjected to significant changes or a quick human reaction is needed. Such performation can be available both in paper and digital versions, published on on-line websites – depending on the needs. For rapid mapping almost every type of image data can be used. In rapid mapping different editorial rules are applicable, it is acceptable to make imaging legible with materials of much less detail. A scale of the design is determined based on the interpretation possibilities, and not on the base of predetermined resolution of the design.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2014, 39 (111); 145-150
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bychkov-Rashba Effect and g-Factor Tuning in Modulation Doped SiGe Quantum Wells
Autorzy:
Malissa, H.
Jantsch, W.
Mühlberger, M.
Schäffler, F.
Wilamowski, Z.
Draxler, M.
Bauer, P.
Powiązania:
https://bibliotekanauki.pl/articles/2038126.pdf
Data publikacji:
2004-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.21.Fg
85.75.-d
Opis:
We investigate the spin resonance of electrons in one-sided modulation doped Si$\text{}_{1-x}$Ge$\text{}_{x}$ (x=0-10%)) quantum wells defined by Si$\text{}_{0.75}$Ge$\text{}_{0.25}$ barriers. In such structures, the Bychkov-Rashba effect induces an effective magnetic field in the quantum well layer which causes anisotropy of both the g-factor and the spin coherence time. Evaluation of the Rashba coefficient as a function of x yields a monotonic increase. For x=5% the shift in the resonance field exceeds the ESR linewidth already, demonstrating the possibility to use this effect for g-factor tuning to select individual spins in an ensemble.
Źródło:
Acta Physica Polonica A; 2004, 105, 6; 585-590
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis, spectroscopic characterization and antimicrobial evaluation of some (E)-N-(4-substitutedbenzylidene)-4-fluorobenzenesulfonamides
Autorzy:
Jayanthi, P.
Jesu Retna Raj, G.
Sekar, M.
Thanikachalam, V.
Powiązania:
https://bibliotekanauki.pl/articles/1113828.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
4-fluorobenzenesulfonamide
Bauer-Kirby
IR spectra
NMR spectra
antimicrobial activities
Opis:
In the present study, six numbers of Schiff bases (1-6) have been synthesized by the condensation of 4-fluorobenzenesulfonamide and substituted aromatic aldehyde. The purities of these Schiff bases have been checked by their physical constants, IR, 1H NMR and 13CNMR spectral data. The antimicrobial activities of these Schiff bases have been evaluated using Bauer-Kirby method.
Źródło:
World News of Natural Sciences; 2017, 13; 101-112
2543-5426
Pojawia się w:
World News of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of in-feed larch sawdust anti-inflammatory effect in sows
Autorzy:
Tzika, E.D.
Tassis, P.D.
Papatsiros, V.G.
Pferschy-Wenzig, E.M.
Siochu, A.
Bauer, R.
Alexopoulos, C.
Kyriakis, S.C.
Franz, C.
Powiązania:
https://bibliotekanauki.pl/articles/32099.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:
The study aimed to investigate the possible anti-inflammatory activity of larch sawdust as feed supplement in lactating sows’ diet and its possible effect on the prevalence of Postpartum Dysgalactia Syndrome under field conditions. In a Greek farrow-to-finish pig farm, fifteen sows were randomly and equally allocated to a negative control group (NC group), a positive control group (PC group), and a treatment group (LT group). The animals of the first two groups received 99% basic diet and 1% corn starch, while LT group animals received 99% basic diet and 1% larch sawdust. The whole trial period lasted 35 days (7 days prior to farrow – day of weaning). At parturition day, animals of the PC group received 2 ml of an anti-inflammatory drug intramuscularly (meloxicam, Metacam®, Boehringer Ingelheim Vetmedica), while the animals of both other groups, received 2 ml of normal saline. Results showed insignificant differences among experimental groups for parameters such as post-partum rectal temperature and piglets performance. On the contrary, a significant increase of mean milk lactation index was observed in LT and PC groups on the 4th day of lactation period, when compared with NC group (p=0.014). Additionally, mean IL-6 concentrations in blood in the LT group showed a tendency for reduction when compared with those found in NC, and insignificant difference (p>0.05) when compared with those observed in PC group 24 hours postpartum. Moreover, the respective TNFα mean level in the LT group at 24 and 72 hours after parturition was similar to that found in PC group, respectively) and significantly lower than that determined in the NC group (p=0.003, p=0.024. The results suggest a possible anti-inflammatory effect of larch sawdust in sows.
Źródło:
Polish Journal of Veterinary Sciences; 2017, 20, 2
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Full-bridge MMC DC fault ride-through and STATCOM operation in multi-terminal HVDC grids
Autorzy:
Kontos, E.
Tsolaridis, G.
Teodorescu, R.
Bauer, P.
Powiązania:
https://bibliotekanauki.pl/articles/202064.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
DC current control
DC fault
HVDC converters
HVDC transmission
MMC
multi-terminal network
STATCOM
prąd stały
błąd DC
przetwornica HVDC
transmisja HVDC
Opis:
This paper investigates a control structure to enhance the DC fault ride-through capability of a full-bridge modular multilevel converter (MMC) station, while ensuring a stable controlled operation as a STATCOM during DC faults without the need for fault isolation. Taking advantage of the switching states of a full-bridge submodule, a DC current controller is proposed, which provides the DC voltage reference for the modulation when a DC fault is detected. By changing the outer controllers strategy from DC voltage or active power control to converter energy control during a fault, the decoupling of the converter operation from the DC side dynamics is realized. In this paper, the focus is on the control methodology at all times of operation and the evaluation of the STATCOM control during a fault. To this end, extensive simulations were performed on a three-terminal high voltage direct current (HVDC) grid in radial configuration and a pole-to-pole DC fault case was investigated. The results showed that the AC voltage and current were controlled within limits at all times, while the full-bridge MMC was able to provide reactive power support to the AC grid. Moreover, using the proposed control methodology, the transients at the operation transition points between STATCOM and inverter/rectifier operation were minimized and the stations were able to safely ride through the fault.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2017, 65, 5; 653-662
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wykorzystanie wysokorozdzielczych danych obrazowych w opracowaniach kartograficznych do celów wojskowych
Very High Resolution Imagery Data in Cartographic Elaborations for Military Use
Autorzy:
Bauer, R.W.
Piotrowski, A.
Stępień, G.
Powiązania:
https://bibliotekanauki.pl/articles/204232.pdf
Data publikacji:
2013
Wydawca:
Polskie Towarzystwo Geograficzne
Tematy:
wysokorozdzielcze dane obrazowe
analizy geoprzestrzenne
baza danych georeferencyjnych
mapa obrazowa
very high resolution imagery data
geospatial analysis
georeferenced database
image map
Opis:
W artykule przedstawiono wykorzystanie wysokorozdzielczych danych obrazowych do celów wojskowych. Autorzy wskazali trzy zasadnicze obszary wykorzystania danych fotogrametrycznych i teledetekcyjnych, którymi są mapy wektorowe (bazy danych georeferencyjnych), analizy geoprzestrzenne oraz opracowania specjalne - mapy obrazowe (image maps). Przedstawiono zalety i ograniczenia ortofotomapy satelitarnej i innych opracowań specjalnych, wykonywanych i wykorzystywanych przez wojska NATO w warunkach pokoju oraz w strefie działań wojennych.
The article presents the application of very high resolution imagery data in military cartographic elaborations. Three basic areas of application photogrammetry and remote sensing data have been indicated: vector maps (georeferenced data bases), geospatial analysis and special elaborations - image maps. Basic vector data bases created by NATO using very high resolution imagery data are mainly Vmap bases (vector map bases) with detail levels corresponding to information resolution of particular scales of cartographic elaboration: LO -1:1 000 000, L1 - 1:250 000, L2 - 1:50 000 and L3 - 1:25 000. Military vector maps (Vmap) enable spatial analyses using topology of presented terrain objects and attributes assigned to them. The other data base elaborated as part of an international agreement (including Poland) which uses very high resolution satellite images is the basis created within the framework of the MGCP project (Multinational Geospatial Co-production Program), in which 32 countries currently participate. MGCP is a global basis. The idea of the project is to create data for regions of interest, areas of current and potential conflicts and threats. The characteristic feature of data in the MGCP project is the fact that they don't include a full range of objects required to create some kinds of maps, e.g. the topographic map. These data cannot be field verified and horizontal detail of object location should have an error of no more than 25 meters. Information concerning borders, their course and status can be treated differently in each country taking part in the program, so in order to avoid potential conflict of interest it has been decided not to include such data in MGCP. The article also presents special elaborations done during stability missions in Iraq and Afghanistan. Image maps have presently become basic cartographic material in regions of conflict and hazards. They also constitute the basis for conducting further analyses. They are special maps (which thus do not undergo strict standard limitations), so the information range, scale and sheet size are conformed to particular user needs and the task performed. Application of very high resolution area imageries on stability missions in war zones is common practice. This is done because of the particularities of climatic, meteorological, logistical and organizational conditions as well as safety precautions. The article characterizes kinds of image data used by the army while showing the possibilities of creating cartographic elaborations and conducting geospatial analyses on the basis of this data. Through current image data it is possible to create quick cartographic elaborations mainly used in war zones, but which are more and more often made useful in elaborations intended for use during times of peace. Usage of satellite images has led to the emergence of a new type of product - image maps. Their elaboration standards have a loosely defined reference system and content range. Their applications are limited, e.g. they cannot be used for precise navigation. The kind of realized task and map addressee requirements are decisive here.
Źródło:
Polski Przegląd Kartograficzny; 2013, T. 45, nr 1, 1; 25-35
0324-8321
Pojawia się w:
Polski Przegląd Kartograficzny
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-25 z 26

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