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Wyświetlanie 1-15 z 20
Tytuł:
Phonon Images of Crystals for Different Sources
Autorzy:
Jasiukiewicz, Cz.
Paszkiewicz, T.
Powiązania:
https://bibliotekanauki.pl/articles/1929612.pdf
Data publikacji:
1993-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
63.20.Kl
66.70.+f
Opis:
The focusing patterns for energy and quasi-momentum are obtained for different types of phonon sources. We considered point and extended (Gaussian) sources and sources of monochromatic and Planckian phonons.
Źródło:
Acta Physica Polonica A; 1993, 84, 3; 459-473
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preisach Images of a Simple Mechanical System
Autorzy:
Gutowski, M.
Markovskyi, S.
Chyao, A.
Powiązania:
https://bibliotekanauki.pl/articles/1400188.pdf
Data publikacji:
2013-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
07.05.Tp
45.20.da
75.60.Ej
Opis:
This work is an an early stage of a larger project aiming at answering the question whether or not the Preisach map is really fingerprinting magnetic materials. More precisely, we are interested whether the Preisach model of magnetic hysteresis indeed contains any physics or is just a convenient modeling tool. To this extent we study a very simple mechanical system, thus fully tractable, subjected to the external force. Despite of its simplicity, our model captures all the fundamental features of real magnetic materials, namely their hysteretic behavior, coercivity, remanent magnetization, and saturation at high fields. Both the overall shape of major hysteresis loop as well as first order reversal curves are reproduced quite correctly; they are very similar to those observed in magnetic materials. The model essentially consists of a single, spring loaded, rigid and rotative bar with non-zero friction torque. The length of a projection of this bar onto the direction of an external force is identified with magnetization. The friction torque and the spring constant are the only freely adjustable parameters of our model. Here we investigate, and present, their influence on the inferred Preisach maps.
Źródło:
Acta Physica Polonica A; 2013, 123, 1; 13-15
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Recovering Images from PET Camera
Autorzy:
Üstündağ, D.
Powiązania:
https://bibliotekanauki.pl/articles/1031634.pdf
Data publikacji:
2017-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
02.30.ZZ
02.50.-R
29.30.KV
87.57.Q-
87.57.U
Opis:
We study here one of the imaging techniques, used in nuclear medicine, called positron emission tomographic imaging, that provides information about many biological processes that are essential to the functioning of the organ, being visualized. Our emphasis is given to the application of the maximum entropy image reconstruction method called "Cambridge MaxEnt Package" for recovering images of the human brain from data obtained by positron emission tomographic camera.
Źródło:
Acta Physica Polonica A; 2017, 132, 3; 963-966
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Images of Dislocations in Synchrotron Bragg-Case Section Topography of Diamond
Autorzy:
Wierzchowski, W.
Moore, M.
Powiązania:
https://bibliotekanauki.pl/articles/1920864.pdf
Data publikacji:
1992-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.10.-i
61.70.-r
Opis:
Bragg-case synchrotron section topographs were studied in parallel slabs cut from a synthetic diamond of a good quality. The topographs revealed the Pendellösung fringes and images of dislocations and other defects containing several fringe systems. The experiment provided the opportunity for studying of the theoretical dislocation images obtained by numerical integration of the Takagi-Taupin equations. A program employing a variable step of integration in the Bragg-case has been presented. The influence of the finite slit width and of the limited beam divergence on the theoretical images is also discussed.
Źródło:
Acta Physica Polonica A; 1992, 82, 2; 193-200
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Methods of Information Extraction from OCT Images
Autorzy:
Zajac, A.
Urbański, Ł.
Kasprzak, J.
Kecik, D.
Powiązania:
https://bibliotekanauki.pl/articles/1493300.pdf
Data publikacji:
2011-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
87.57.-s
42.79.Qx
42.30.Wb
Opis:
Optical diagnostic methods of biological media are more and more willingly used in clinical practice - also instead of classical biopsy. Particularly, optical coherent tomography methods and mammography (permitting achieving three-dimensional imaging of a tissue) are attractive in comparison with classical diagnostic methods. The article presents the analysis methods of optical parameters of biological tissues developed allowing obtaining absolute values of these parameters. Thanks to modern image analysis methods - wavelet transforms - the optical diagnostic effectiveness was improved. The theoretical and practical results achieved were compared with results of commercially accessible methods implemented in OCT devices.
Źródło:
Acta Physica Polonica A; 2011, 120, 4; 772-775
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Atomic and Electronic Structure of a Tip on Stm Images
Autorzy:
Jurczyszyn, L.
Mingo, N.
Flores, F.
Powiązania:
https://bibliotekanauki.pl/articles/1968715.pdf
Data publikacji:
1998-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
07.79.Cz
61.16.Ch
Opis:
Theoretical studies of the influence of electronic and atomic structure of a tip on scanning tunneling microscopy images are presented. Results are discussed for the scanning of Al(001) and Al(001)+Xe surfaces performed within aluminum and nickel tips of a different geometry.
Źródło:
Acta Physica Polonica A; 1998, 93, 2; 307-315
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Data Processing Programs for Analysis of Diffraction Images of Macromolecular Crystals Recorded using Synchrotron Radiation
Autorzy:
Gilski, M.
Powiązania:
https://bibliotekanauki.pl/articles/1431531.pdf
Data publikacji:
2012-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.10.-i
07.85.Qe
61.05.cp
Opis:
Besides the crystal preparation, the first and crucial step in the process of protein structure determination is proper processing of the collected diffraction images, as they provide the experimental observations used throughout the entire process of structure solution and refinement. In the last two decades several computer programs have been developed. Among the most used and popular are: HKL2000, MOSFLM, d*TREK and XDS package. To find out the advantages and disadvantages of the data processing programs, several very different data sets, including diffraction data from DNA/RNA and protein crystals were tested. It has been found that all the major programs for processing and analysis of diffraction data give excellent and comparable results with good quality, medium resolution data sets, but their treatment of very high resolution or imperfect data differs in terms of indexing, spot integration, scaling and the treatment of errors. If the diffraction data are of good quality and the problem is relatively straightforward, the automated approach to data processing may be most appropriate. On the other hand, if one is trying to squeeze out as much information from the experimental data as possible, then only expert manual processing can be successful, regardless of the data quality.
Źródło:
Acta Physica Polonica A; 2012, 121, 4; 871-875
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Observation of Interference Fringes in Bragg-Case Synchrotron Double-Crystal Images of Stacking Faults in Diamond
Autorzy:
Wierzchowski, W.
Moore, M.
Powiązania:
https://bibliotekanauki.pl/articles/1920862.pdf
Data publikacji:
1992-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.10.-i
61.70.-r
Opis:
Bragg-case synchrotron double-crystal images of stacking faults were studied in a slab prepared from a synthetic diamond of a good quality. The images of stacking faults in topographs taken on the tails of the rocking curve exhibited well pronounced interference fringes. The fringes were strongly dependent on the angular setting and they were less spaced further from the maximum. The experimental images were compared with those theoretically predicted from an application of plane-wave dynamical theory. A reasonably good correspondence between theoretical and experimental images was obtained. The theoretical images of stacking faults were dependent on the type of stacking fault, producing some difference in the first fringe.
Źródło:
Acta Physica Polonica A; 1992, 82, 2; 185-191
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Interference Fringes in the Plane Wave Topographic Images of Growth Bands in Si:Ge
Autorzy:
Wieteska, K.
Wierzchowski, W.
Graeff, W.
Lefeld-Sosnowska, M.
Regulska, M.
Powiązania:
https://bibliotekanauki.pl/articles/2030662.pdf
Data publikacji:
2002-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.72.Ff
Opis:
An Si:Ge crystal with approximately 3% of germanium was studied with strongly collimated short-wavelength monochromatic synchrotron beam (beamline E2 at HASYLAB). The topographs obtained in the asymmetric 224 reflection revealed the presence of interference fringes related to growth bands caused by segregation of germanium. The fringes, observed for the first time, were strongly dependent on the angular setting and it was possible to distinguish at least three systems of fringes. A number of features of the existing strain field, which may be important for the formation of the fringes, was determined using other topographic methods, especially the Bragg-case section topography.
Źródło:
Acta Physica Polonica A; 2002, 101, 5; 729-734
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simulation of Langmuir-Blodgett Film Surface Stm Images
Autorzy:
Agabekov, V. E.
Zhavnerko, G. K.
Bar, G.
Cantow, H.-J.
Powiązania:
https://bibliotekanauki.pl/articles/1968763.pdf
Data publikacji:
1998-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.55.-a
71.20.Rv
02.60.Cb
Opis:
The simulation of the STM image of a hydrocarbon tail of a fatty acid was carried out and compared to the experimental results. The simulation procedure includes calculations of the distribution of an isolated molecule electronic density by the extended Huckel-Hoffmann method. An agreement between the calculated and experimental STM images of closely packed Langmuir-Blodgett film of cobalt behenate on the graphite surface was observed. The weak interactions between the graphite surface and the adsorbed molecules constituting bi- and multilayer Langmuir-Blodgett films can be neglected in simulations of STM images.
Źródło:
Acta Physica Polonica A; 1998, 93, 2; 383-386
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hidden Object Detection System Based on Fusion of THz and VIS Images
Autorzy:
Kowalski, M.
Palka, N.
Piszczek, M.
Szustakowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/1399381.pdf
Data publikacji:
2013-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
07.05.Pj
42.30.Tz
02.60.-x
Opis:
Terahertz imaging makes it possible to acquire images of objects concealed underneath clothing by measuring the radiometric temperatures of different objects on a human subject. Finding objects hidden under clothes is one of key issues of public places security. A possible solution of this problem is a multispectral, terahertz-based screening system with implemented image fusion algorithm. The result of the fusion is a new image which gives more information and is more suitable for human perception. An imaging system is usually composed of various subsystems. Many of the imaging systems use imaging devices working in various spectral ranges. The aim of our studies is to detect and visualize objects hidden under clothing. Detection of potentially dangerous objects is important, but without proper visualization, can be difficult to utilize. Our goal is to build a system harmless to humans for screening and detection of hidden objects using a THz and VIS cameras. The presented system draws attention not only on the properties offered by a single camera but also on the potential of synergetic effects of the system by using the fusion of data registered by different sensor units. In this paper we present the multispectral passive imaging system for hidden threats visualization based on THz and VIS cameras.
Źródło:
Acta Physica Polonica A; 2013, 124, 3; 490-493
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Images of the Seabed of the Gulf of Gdańsk Obtained by Means of the Parametric Sonar
Autorzy:
Kozaczka, E.
Grelowska, G.
Kozaczka, S.
Powiązania:
https://bibliotekanauki.pl/articles/1537471.pdf
Data publikacji:
2010-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
43.30.Ma
43.50.Pc
43.25.Jh
Opis:
The main goal of this paper is to present results of the experimental investigation of the seabed by means of parametric echosounder in the form of chosen images. The phenomena of nonlinear interaction between two parallel beams of high intensity gives as a results very narrow beam of low frequency wave, that enables to penetrate the sea bottom. The first step of our investigations was calibration of all the elements of the measuring system. In the second step the marine trials were carried out. For this purpose the mobile measuring set up was installed on the board of sailing boat. The details about the measuring devices can be found below. The main goal of these investigations was to determine the structure of the seabed for different places of the Gulf of Gdańsk. The special features of parametric generation of sound beam allow to penetrate the bottom for more then several meters. At the end of the paper, a set of images that illustrated the results of investigations has been presented.
Źródło:
Acta Physica Polonica A; 2010, 118, 1; 91-94
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of Methods for Determining the Contrast Distribution in Interference Images with Speckle Noise
Autorzy:
Pyziak, L.
Matczak, M.
Zięba, P.
Powiązania:
https://bibliotekanauki.pl/articles/1032503.pdf
Data publikacji:
2017-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.25.Hz
42.30.-d
42.30.Kq
42.30.Ms
Opis:
Information about certain physical states of an examined object is encoded in the distribution of the fringe contrast in the metrological interference images of the object. Determining the contrast is one of the steps of converting the image into the distribution of the measured quantity in holographic fringe-contrast interferometry. In this paper, three methods of determining the fringe contrast in interference images containing speckle noise are compared. As the criterion for comparing the methods, the mean absolute error has been used. It turns out, in accordance with this criterium, the most effective method is the phase-shifting one.
Źródło:
Acta Physica Polonica A; 2017, 132, 1; 173-175
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Simulation of Bragg-Case Section Images οf Dislocations and Inclusions in Aspect of Identification of Defects in SiC Crystals
Autorzy:
Balcer, T.
Wierzchowski, W.
Wieteska, K.
Powiązania:
https://bibliotekanauki.pl/articles/1538998.pdf
Data publikacji:
2010-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.72.Ff
61.72.up
Opis:
The numerical simulation has been applied for studying of Bragg-case section topographic images of dislocation and rod-like inclusions. The validity of simple approximation of extinction contrast was confirmed in the case of screw dislocations in silicon carbide crystals. A procedure for approximate calculation of the strain field of rod-like inclusion was constructed, consisting of adding the contributions from a very large number of point-like inclusions uniformly distributed inside the assumed volume of the inclusion. The procedure ensured a reasonable similarity between the simulated topographs and experimental Bragg-case section topographic images of some pipe-formed cavities in silicon carbide crystals. The method is useful for some other materials, e.g. it enabled to compute realistic simulation of plane-wave topographs of the rod-like inclusions in YAG.
Źródło:
Acta Physica Polonica A; 2010, 117, 2; 336-340
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dependence of STM Images οn Bias Polarity for Sm Layers οn Mo(110) and Mo(211) Surfaces
Autorzy:
Kuchowicz, M.
Szukiewicz, R.
Grodzińska, D.
Powiązania:
https://bibliotekanauki.pl/articles/1811506.pdf
Data publikacji:
2008-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.37.Ef
68.37.-d
71.20.Eh
Opis:
Thin Sm layers adsorbed on Mo(110) and (211) surfaces were studied with scanning tunneling microscope. It was found that obtained images of these adsorption systems significantly depend on the polarity of the scanning tunneling microscope bias voltage. This dependence is more pronounced for the Sm on Mo(110) than on Mo(211). For Sm/Mo(110), at low Sm coverages the change of bias polarity results in significant difference in the measured height of the adsorbed Sm layer, while the heights of substrate terraces remain the same for both signs of the applied bias voltage. In the coverage range 0.65<θ<1, scanning tunneling microscope images, obtained with negative bias, show the gaps in Sm layers, which are invisible for positive bias.
Źródło:
Acta Physica Polonica A; 2008, 114, S; S-59-S-69
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 20

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