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Wyszukujesz frazę "42.79.Ls" wg kryterium: Temat

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    Wyświetlanie 1-12 z 12
    Tytuł:
    Measurement Possibility Analysis of the Real Values of the Tissue Structure Parameters with the Use of Optical Coherent Tomography Method
    Autorzy:
    Kasprzak, J.
    Kęcik, D.
    Zajac, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1493240.pdf
    Data publikacji:
    2011-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    06.20.-f
    42.79.-e
    42.79.Ls
    42.30.Wb
    87.19.rm
    Opis:
    The issues connected with the usefulness of the method of averaging A-scans applied in measurements of real optical parameters with the use of commercial optical coherent tomography systems have been discussed. The basic method description and examples of applications have been given. Examples of the characteristics of metrological devices used in medical practice as well as the possibility of the method applied to the turbidity assessment have been presented.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 4; 662-665
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Evaluation of Solid Particle Erosion in Polymethyl Methacrylate by Surface Topography Mapping
    Autorzy:
    Fidan, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1194942.pdf
    Data publikacji:
    2014-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.68.+m
    42.79.Ls
    42.87.-d
    81.05.Qk
    Opis:
    The present work introduces and demonstrates a novel high resolution surface topography method for mapping the distribution of erosive wear in polymethyl methacrylate. The technique is based on grayvalues obtained from eroded sample surfaces and three-dimensional surface topography mapping from these grayvalues. Surface topography maps make it a valuable method for fundamental studies on erosive wear. In the present investigation, a flatbed scanner system has been used for obtaining the surface images of eroded test samples. Polymethyl methacrylate test samples eroded with 80 and 120 mesh alumina particles at 1.5 and 3 bar blast pressures and their surface topography maps compared. Erosive wear is difficult to visualize for its dynamic and complex nature, hence monitoring of erosive wear in industrial applications is rather important. High resolution surface topography method detail capturing capability may improve tribological surface damage characterization of real machine elements. Reduced costs and simplicity two primary outcomes of using a simple flatbed scanner system in non destructive testing of erosive wear.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 2; 494-496
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ultrasonic Investigation of Snow and Ice Parameters
    Autorzy:
    Gudra, T.
    Najwer, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1493199.pdf
    Data publikacji:
    2011-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.68.Ge
    42.79.Ls
    43.35.Ae
    92.60.Wc
    Opis:
    In the paper some ultrasonic methods of measurement of sound velocity and attenuation in snow and ice media are presented. The measurement setup consists of ultrasonic airborne transducers working at the frequency of f = 40 kHz. A non-contact method of reflection coefficient on air-snow border was applied during measurement of different types of snow in the density range of 120-700 kg/$m^3$. Examples of obtained signals are also presented. It was proved that there is a linear dependence between reflection coefficient and snow density. The state of snow or ice layer is not precisely correlated with their acoustical parameters: ultrasound wave velocity and attenuation of ultrasonic wave during the measurement of the layer depth using the non-contact method. Reflection coefficient of snow can be used for estimation of snow density.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 4; 625-629
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influences of Particle Impingement Angle and Velocity on Surface Roughness, Erosion Rate, and 3D Surface Morphology of Solid Particle Eroded Ti6Al4V Alloy
    Autorzy:
    Avcu, E.
    Yıldıran, Y.
    Şahin, A.
    Fidan, S.
    Sınmazçelik, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1194513.pdf
    Data publikacji:
    2014-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Bx
    81.70.-q
    68.35.B-
    68.35.-p
    42.79.Ls
    Opis:
    In this study, it is aimed to investigate the effects of particle impingement angle and velocity on the surface roughness, erosion rate, and surface morphology of solid particle eroded Ti6Al4V alloy. Ti6Al4V samples were eroded in erosion test rig under various particle impingement angles (15°, 30°, 45°, 60°, 75° and 90°) and impingement velocities (33 m/s, 50 m/s, and 75 m/s) by using 120 mesh garnet erodent particles. Subsequently, erosion rates and surface roughness values of samples were analyzed and calculated as a function of particle impingement angle and velocity. Moreover, 3D surface morphologies of the eroded samples were prepared by using high definition scanner and image processing programs. Results show that erosion rates, surface roughness values and surface morphologies of Ti6Al4V alloy have been varied significantly depending on the both particle impingement angle and velocity. Erosion rates of Ti6Al4V alloy were decreased with increases in particle impingement angle; on the other hand, the surface roughness values were increased with increases in particle impingement angle. Both erosion rates and surface roughness values were increased with increases in particle impingement velocity. Finally, the surface morphologies of the eroded samples were evaluated deeply. It is concluded that the surface morphology variation of the Ti6Al4V alloy depending on the particle impingement angle and velocity were well correlated with the erosion rates and the surface roughness values.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 2; 541-543
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Particle Impact Angle, Erodent Particle Size and Acceleration Pressure on the Solid Particle Erosion Behavior of 3003 Aluminum Alloy
    Autorzy:
    Yıldıran, Y.
    Avcu, E.
    Şahin, A.
    Fidan, S.
    Yetiştiren, H.
    Sınmazçelik, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1195082.pdf
    Data publikacji:
    2014-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Bx
    81.70.-q
    68.35.B-
    68.35.-p
    42.79.Ls
    68.37.Hk
    07.85.Nc
    Opis:
    This study aims to examine solid particle erosion behavior of 3003 aluminum alloy. 3003 aluminum alloy samples were eroded in erosion test rig under various particle impingement angles (15°, 30°, 45° and 60°) and acceleration pressures (1.5, 3 and 4 bar) by using 80 mesh and 180 mesh sized erodent particles (garnet). The erosion rates of aluminum alloy samples were calculated depending on the erosion parameters. The erosion rates of the samples have varied dramatically depending on particle impingement angle, acceleration pressure and erodent particle size. The maximum erosion rates were observed at 15° impingement angles at all acceleration pressures and particle sizes. Moreover, erosion rates of the samples were increased with increases in acceleration pressure at all particle impingement angles and particle sizes. On the other hand, erosion rates of the samples decrease with increase in erodent particle sizes. Hence, maximum erosion was observed when the aluminum alloy eroded at 15° impingement angle and 4 bar pressure by using 180 mesh erodent particles. Finally, the eroded surfaces of the samples were analyzed by using scanning electron microscope. The surfaces of the samples were also investigated by using energy dispersive X-ray analysis in scanning electron microscopy studies. Microcutting and microploughing erosion mechanisms were observed at 15° and 30° impingement angles, while deep cavities and valleys formed due to plastic deformation were observed at 45° and 60° impingement angles. Moreover, embedded erodent particles were clearly detected on the surfaces of the samples by energy dispersive X-ray analysis.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 2; 523-525
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optical Fibre Magnetic Field Sensors for Monitoring οf the State of Work of Electric Motors
    Autorzy:
    Barczak, K.
    Pustelny, T.
    Zycki, Z.
    Blazejczyk, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1795778.pdf
    Data publikacji:
    2009-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.70.-a
    42.79.Hp
    42.81.-i
    42.79.Pw
    78.20.Ls
    Opis:
    The present paper deals with investigations concerning optical magnetic sensors. The most important advantage of sensors of this kind is their safety of service and insulating power. The insensitiveness of optical sensors to electromagnetic interference was discussed and experimentally investigated. The experimental investigations were concentrated on the adequate sensing fibre as well as on the sensor based on the bulk glass cylinder. The paper presents the results of magnetooptic tests of the elaborated magnetic field optical sensors and conclusions arise from them.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 3; 250-253
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optical Sensor of the Magnetic Field in Electrical Power Engineering
    Autorzy:
    Barczak, K.
    Pustelny, T.
    Zycki, Z.
    Blazejczyk, T.
    Dorosz, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1506720.pdf
    Data publikacji:
    2010-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.70.-a
    42.81.-i
    42.79.Pw
    78.20.Ls
    Opis:
    The authors of the presented paper deal with investigations concerning applications of the optical fiber sensor of the magnetic field in electric DC engines with permanent magnets. The aim of the sensor is to measure the state of magnetization of permanent magnets (basing on the measurements of magnetic field induction). The knowledge of the state of magnetization helps to decide whether permanent magnets need to be additionally magnetized in order to prevent damages of the whole engine. This can be done automatically, even when the engine is running. For the purpose the Faraday magnetooptic effect is used. The presented investigations concern an optical fiber sensor of the magnetic field provided with a glass rod characterized a high value of the Verdet constant as the sensing element. Thanks to the application of optical fibers the connection of the sensor head with the whole measuring system is constructed of insulating material without using of electrical connections.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 6; 1090-1092
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optical Fibre Current Sensor for Electric Power Industry
    Autorzy:
    Barczak, K.
    Pustelny, T.
    Dorosz, D.
    Dorosz, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1506714.pdf
    Data publikacji:
    2010-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.70.-a
    42.81.-i
    42.79.Pw
    78.20.Ls
    Opis:
    The paper deals with the optical fibre current sensor based on new optical fibre made of glass with a high value of refractive index. This kind of glass was developed to meet the requirements of these optical fibres. The aim of investigations was to develop a new optical fibre with adequate magneto-optical properties and a relatively weak linear birefringence resulting from the process of its production. These features are of essential importance for optical fibre current sensors. The results of investigations concerning such optical fibres have been presented, displaying satisfactory magneto-optical properties, as well as only low linear birefringence induced by stresses arising in the course of their manufacturing.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 6; 1087-1089
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    New Optical Glasses with High Refractive Indices for Applications in Optical Current Sensors
    Autorzy:
    Barczak, K.
    Pustelny, T.
    Dorosz, D.
    Dorosz, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1795777.pdf
    Data publikacji:
    2009-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.70.-a
    42.81.-i
    42.79.Pw
    78.20.Ls
    Opis:
    The paper concentrates on the optical fibre sensors of electric current intensity. The specially elaborated glasses with high values of refractive indices were investigated in the prepared testing stand. The glasses have possessed the refractive index values n in the range 1.6 ≤ n ≤ 2.2. For the glasses the values of the Verdet constants for two waveguides: $λ_1$ = 635 nm and $λ_2$ = 1550 nm were determined. The obtained results showed that the elaborated on the base of new glasses optical fibres are much more sensitive on the action of magnetic field than the silica fibres.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 3; 247-249
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Photonic-Crystal Fibres with Suspended Core - Numerical Analyses
    Autorzy:
    Pustelny, T.
    Grabka, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1811518.pdf
    Data publikacji:
    2008-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.20.Ls
    07.07.Df
    42.79.Pw
    42.81.-i
    Opis:
    The paper gives a short description of light guidance mechanisms of index-guided photonic-crystal fibres. The results of numerical analyses of photonic-crystal fibres with a suspended core are presented. Such fibres are planned to be applied for investigation of magneto-optic effects in gaseous media.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 6A; A-115-A-120
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Exchange Coupled Double Layers for Magneto-Optical Applications
    Autorzy:
    Becker, S.
    Rohrmann, H.
    Roell, K.
    Stobiecki, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/1953155.pdf
    Data publikacji:
    1997-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.70.Ch
    42.79.Vb
    78.20.Ls
    75.70.-i
    Opis:
    Optical data storage is a rapidly developing technique, which emerges in many varieties. Magneto-optical recording, in particular, applies amorphous rare earth/transition metal films, where a binary coded information is written thermomagnetically and is read by the magneto-optical Kerr or Faraday effect. To increase the writing speed and the recording density, techniques for direct overwrite and magnetically induced superresolution were proposed, which involve these of exchange coupled double layer systems as a storage media. In this paper, the principles and the properties of exchange coupled double layers are discussed with respect to the direct overwrite and the magnetically induced superresolution processes. A formalism based on a switching field diagram is developed yielding all information necessary to achieve reliable and practical writing procedures. As an example, the direct overwrite capability is demonstrated experimentally in antiparallel coupled layer systems.
    Źródło:
    Acta Physica Polonica A; 1997, 91, 1; 55-65
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Czochralski-Based Growth and Characteristics of Selected Novel Single Crystals for Optical Applications
    Autorzy:
    Shimamura, K.
    Víllora, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399453.pdf
    Data publikacji:
    2013-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.10.St
    77.84.-s
    85.60.Jb
    42.79.Bh
    78.20.Ls
    85.70.Sq
    Opis:
    In the Year of Professor Jan Czochralski, we with pleasure review the representative recent works of our group, Optical Single Crystals Group, NIMS, Japan. Our group has been working on the development of novel single crystals for optical applications based on the Czochralski technique. Here, 4 kinds of topics are reviewed. 1st one is ferroelectric fluoride $BaMgF_{4}$ single crystals for UV nonlinear optical applications including quasi-phase matching device fabrications. 2nd one is transparent conductive $\beta-Ga_{2}O_{3}$ single crystals as semiconductor, which has large band-gap, 4.8 eV, for LED applications. 3rd one is F-doped core-free $Y_{3}Al_{5}O_{12}$ single crystals as a potential new lens material for UV/VUV wavelength region. Last one is superior magneto-optical ${Tb_3}[Sc_{2-x}Lu_{x}](Al_{3})O_{12}$ single crystals for near infrared to visible region, and $CeF_3//PrF_3$ single crystals for UV region.
    Źródło:
    Acta Physica Polonica A; 2013, 124, 2; 265-273
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-12 z 12

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