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Wyświetlanie 1-15 z 45
Tytuł:
2×2 MIMO VLC optical transmission system based on LEDs in a double role
Autorzy:
Kowalczyk, M.
Powiązania:
https://bibliotekanauki.pl/articles/1065670.pdf
Data publikacji:
2016-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
07.50.Qx
07.60.-j
42.72.Bj
42.79.-e
42.82
Opis:
The article presents the concept solution of two main issues of visible light communication systems, i.e. the lack of a cost-effective feedback channel and the handling of high throughput. The concept is based on merging of the multiple input multiple output approach, well-known from radio transmission domain, with using of LEDs in a double role, i.e. both as emitters and detectors of light. The feasibility of the proposal was confirmed by the results of the research, carried out for two-channel system of this type.
Źródło:
Acta Physica Polonica A; 2016, 130, 1; 41-44
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Finite-Element Flash Method for Measuring Thermal Conductivity of Liquid
Autorzy:
Mamczur, J.
Wasilewski, A.
Więcek, T.
Powiązania:
https://bibliotekanauki.pl/articles/1402572.pdf
Data publikacji:
2015-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
44.05.+e
44.10.+i
07.05.Tp
02.70.Dh
02.60.Ed
Opis:
A laser beam is used to heat a portion of liquid closed in a vessel from the top of it to avoid convection. The temperature is measured at the bottom of the vessel by a laser waveguide sensor. The heating and measuring methods allow using a small amount of liquid of the order of a milliliter fraction. The heat flow through the liquid as well as the surrounding vessel and space is modeled by the finite-element method to calculate the temperature at the bottom vs. time. Thus obtained dependence is used then as a fitting function to get the liquid thermal conductivity among some other fitting parameters.
Źródło:
Acta Physica Polonica A; 2015, 128, 2; 193-195
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of Acoustic Signals Interfering Diagnostic Measurements of Electric Power Transformer Tap Changers
Autorzy:
Boczar, T.
Cichoń, A.
Borucki, S.
Szczyrba, T.
Powiązania:
https://bibliotekanauki.pl/articles/1399334.pdf
Data publikacji:
2013-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
43.58.-e
43.60.-c
43.60.Bf
Opis:
Subject matter of this paper applies to improvement of acoustic emission method used in the diagnosis of on load tap changers of high power transformers. During measurement of acoustic emission signals generated by damages or defects, which can appear in insulation system and in the power transformer tap changers, various forms of noise signals may occur. Interferences occurring during measurements under laboratory and under industrial conditions can be generated either by sources placed inside the studied electric power device or they can be emitted in their immediate vicinity. Sources of interfering signals are physical phenomena of a mechanical, electrical or acoustical nature. Interferences appearing during measurement of acoustic emission pulses generated by electrical discharges and other types of defects that overlap the measured waveforms may result in their distortion. As part of the research conducted, the results of which are presented in this paper, following was subjected under consideration: measurements of acoustic noise signals generated by partial surface discharges occurring on support and bushing insulators were performed.
Źródło:
Acta Physica Polonica A; 2013, 124, 3; 387-390
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Applications of Free Electron Lasers in Biology and Medicine
Autorzy:
Pełka, J.
Tybor, K.
Nietubyć, R.
Wrochna, G.
Powiązania:
https://bibliotekanauki.pl/articles/1539156.pdf
Data publikacji:
2010-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
87.59.-e
41.60.Cr
07.85.Qe
82.53.Ps
87.64.Bx
Opis:
The advent of free electron lasers opens up new opportunities to probe the dynamics of ultrafast processes and the structure of matter with unprecedented spatial and temporal resolution. New methods inaccessible with other known types of radiation sources can be developed, resulting in a breakthrough in deep understanding the fundamentals of life as well as in numerous medical and biological applications. In the present work the properties of free electron laser radiation that make the sources excellent for probing biological matter at an arbitrary wavelength, in a wide range of intensities and pulse durations are briefly discussed. A number of biophysical and biomedical applications of the new sources, currently considered among the most promising in the field, are presented.
Źródło:
Acta Physica Polonica A; 2010, 117, 2; 427-432
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bioimaging with 4th Generation X-Ray Sources
Autorzy:
Pełka, J.
Powiązania:
https://bibliotekanauki.pl/articles/1809941.pdf
Data publikacji:
2009-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
87.59.-e
41.60.Cr
07.85.Qe
82.53.Ps
87.64.Bx
Opis:
Newly constructed 4th generation sources of intense synchrotron radiation in ultrafast pulses of only 10-50 fs and wavelengths up to X-rays, the free electron lasers, are expected to revolutionize development of biological science. To take full advantage of unique properties of the sources, new imaging techniques of molecular and microscopic biological objects are developed. Present article provides a short review of a stormy development of bioimaging with incoming soon 4th generation synchrotron radiation X-ray sources. Some implications for the future of new sources and techniques are discussed as well.
Źródło:
Acta Physica Polonica A; 2009, 115, 2; 572-575
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterization of Transparent and Nanocrystalline $TiO_{2}:Nd$ Thin Films Prepared by Magnetron Sputtering
Autorzy:
Domaradzki, J.
Wojcieszak, D.
Prociow, E.
Kaczmarek, D.
Powiązania:
https://bibliotekanauki.pl/articles/1807648.pdf
Data publikacji:
2009-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.82.Rx
68.55.-a
68.60.-p
68.60.Dv
78.20.-e
Opis:
In this work structural and optical properties of $TiO_{2}$ thin films doped with different amount of Nd have been outlined. The result have shown that by quantity of Nd amount in the film dense nanocrystalline or amorphous thin films were obtained.
Źródło:
Acta Physica Polonica A; 2009, 116, S; S-75-S-77
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of Five-Layered ZrO₂ and Single-Layered Ce, Eu, and Dy-Doped ZrO₂ Thin Films Prepared by Sol-Gel Spin Coating Method
Autorzy:
Çiçek Bezir, N.
Evcin, A.
Kayali, R.
Özen, M.
Esen, K.
Powiązania:
https://bibliotekanauki.pl/articles/1031178.pdf
Data publikacji:
2017-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.37.-d
68.55-a
68.60-p
78.20.-e
81.10.Dn
71.20.Be
Opis:
In order to investigate the influence of the number of layers on the properties of ZrO₂ thin films, we prepared one pure ZrO₂ film sample with five layers and Ce, Eu, and Dy-doped ZrO₂ samples with single layer, by spin-coating sol gel-method. The crystal structures of thin films were determined using X-ray diffraction, morphology of the samples was analyzed by scanning electron microscopy, and the optical properties of the samples were determined by ultraviolet/visible absorbance measurements. The results of these measurements have shown that the concentration of the dopants and the thickness of thin film layers play a vital role in the physical, chemical, and optical properties of the pure and doped ZrO₂ thin films.
Źródło:
Acta Physica Polonica A; 2017, 132, 3; 612-616
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of Pure and Doped TiO₂ Thin Films Prepared by Sol-Gel Spin-Coating Method
Autorzy:
Çiçek Bezir, N.
Evcin, A.
Kayali, R.
Özen, M.
Balyaci, G.
Powiązania:
https://bibliotekanauki.pl/articles/1031525.pdf
Data publikacji:
2017-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.37.-d
68.55.-a
68.60.-p
78.20.-e
81.10.Dn
71.20.Be
Opis:
In this study, using spin-coating sol-gel method we fabricated TiO₂ thin films, doped with different concentrations (1, 2, and 3 mole %) of Ce, Dy, and Eu. Characterization of the prepared samples was performed by means of the X-ray diffraction, scanning electron microscopy, ultraviolet visible absorption, and differential thermal and thermo gravimetric analysis. X-ray diffraction measurements have shown that in Eu and Dy-doped samples crystal structure consists of mixed rutile and the dominant anatase phases, however the Ce doped samples consist of anatase phase only. Scanning electron microscopy images have revealed that while average thin film thickness of the Dy-doped samples decreases with increasing concentration of Dy, the average film thicknesses of samples doped with Ce and Eu increases with increasing concentrations of these dopants. Ultraviolet visible absorption spectroscopy measurements have shown that while absorbances of the samples doped by 1 and 2 mole % of the dopants have nearly similar properties, these properties differ from each other for 3 mole % of the dopants. Finally, differential thermal and thermo gravimetric analyses have shown that the chemical reactions and weight losses of the samples have occurred at the expected temperatures.
Źródło:
Acta Physica Polonica A; 2017, 132, 3; 620-624
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Correlations between Positron Annihilation Parameters and Macroscopic Properties in Copolymers Belonging to Elastomers Group
Autorzy:
Krzemień, K.
Kansy, J.
Powiązania:
https://bibliotekanauki.pl/articles/1812536.pdf
Data publikacji:
2008-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.70.Bj
71.60.+z
61.41.+e
Opis:
The positron annihilation lifetime spectroscopy was used to study correlations between positron annihilation parameters and macroscopic properties in two kinds of polymers from elastomers group. Two kinds of material were investigated: three samples of ethylene octane copolymers (commercial name engage) of different densities and six samples of polybutylene terephtalate-polyether glycol copolymers (hytrel) having different densities. A correlation between intensity of ortho-positronium component and the density (d) of samples was observed for both kinds of material. From the ortho-positronium pick-off lifetime the mean radii (R) of free volume centers were determined. A good linear correlation between R and d was found.
Źródło:
Acta Physica Polonica A; 2008, 113, 5; 1435-1440
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of Colour-Contrast Sensitivity of the Retina
Autorzy:
Kubarko, A.
Firago, V.
Hotra, O.
Powiązania:
https://bibliotekanauki.pl/articles/1199150.pdf
Data publikacji:
2014-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
85.60.-q
42.79.-e
42.15.Eq
07.07.Df
42.79.Pw
Opis:
The computer methods for determining the map of colour-contrast sensitivity of the retina, suitable for mass screening of the earlier disturbances of visual and circulatory systems of humans, are discussed. The expressions for calculation, and the results of the determination of the threshold values of the photon fluxes at which young people detect the light stimulus in the shape of the red square with the side 2 mm, formed on the screen of CRT display, are given.
Źródło:
Acta Physica Polonica A; 2014, 125, 6; 1367-1370
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Thermal Annealing on Optical Properties of Implanted Gaas
Autorzy:
Kulik, M.
Komarov, F. F.
Mączka, D.
Powiązania:
https://bibliotekanauki.pl/articles/2011008.pdf
Data publikacji:
1999-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
07.60.Fs
61.72.Vv
78.20.-e
Opis:
GaAs samples doped with indium atoms by ion implantation and thermal annealed were studied using a channelling method, Rutherford backscattering, and an ellipsometry. From these measurements it was observed that the layer implanted with 3×10$\text{}^{16}$ cm$\text{}^{-2}$ indium dose was totally damaged and its optical properties, namely a refraction index n and an extinction coefficient k, corresponded to the amorphous material. Subsequent isobaric heating of the implanted samples resulted in recovery of the crystalline structures with simultaneous change of the n and k index values.
Źródło:
Acta Physica Polonica A; 1999, 96, 1; 131-135
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Estimation of the Degree of Crystallinity of Partially Crystalline Polypropylenes Using $\text{}^{13}C$ NMR
Autorzy:
Hronský, V.
Koval'aková, M.
Vrábel, P.
Uhrínová, M.
Olčák, D.
Powiązania:
https://bibliotekanauki.pl/articles/1378162.pdf
Data publikacji:
2014-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.41.+e
76.60.-k
81.05.Lg
Opis:
The paper deals with a method for the estimation of the degree of crystallinity for partially-crystalline isotactic-polypropylenes (i-PP) using high-resolution solid-state $\text{}^{13}C$ NMR. For this purpose direct polarization $\text{}^{13}C$ MAS NMR spectra were measured for i-PP samples with different degrees of crystallinity at 98°C. The areas beneath the resonance lines in these spectra correspond to the number of carbons in particular functional groups, while the widths and shapes of the lines reflect the degree of crystallinity, crystalline modifications, distribution of chain conformations and the chain mobility. The $\text{}^{13}C$ MAS NMR spectra, measured using appropriate combination of delay time and high proton decoupling field, made it possible to detect only amorphous domains in the sample. This enabled identification of the lines associated with the amorphous domains in the complete $\text{}^{13}C$ MAS NMR spectra and provided sufficient information for reliable estimation of the degree of crystallinity. The heteronuclear Overhauser enhancement of the $\text{}^{13}C$ NMR signals due to short delay time was taken into account in our calculations.
Źródło:
Acta Physica Polonica A; 2014, 126, 1; 409-410
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Excited State Absorption and Thermoluminescence in Ce and Mg Doped Yttrium Aluminum Garnet
Autorzy:
Wiśniewski, K.
Koepke, Cz.
Wojtowicz, A. J.
Drozdowski, W.
Grinberg, M.
Kaczmarek, S. M.
Kisielewski, J.
Powiązania:
https://bibliotekanauki.pl/articles/2007834.pdf
Data publikacji:
1999-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.55.Hx
78.55.-m
78.60.Kn
73.50.Gr
29.40.Mc
78.20.-e
78.20.Wc
78.40.-q
Opis:
In this paper we report preliminary results of optical studies on Y$\text{}_{3}$Al$\text{}_{5}$O$\text{}_{12}$ (YAG) crystals codoped with Ce and Mg. By using measurements of luminescence, absorption, and luminescence excitation spectra we demonstrate that although the basic features introduced to the YAG host by the Ce-doping remain intact, the Mg-codoping imposes some significant changes on other properties of the material. These changes are potentially important for laser and/or scintillator applications of YAG:Ce and are due, most likely, to modifications of defect populations in the material. We characterize them by using the techniques of thermoluminescence and excited state absorption under excimer laser pumping. These techniques, interestingly, yield results that seem inconsistent. While the thermoluminescence signal of the Mg-doped sample is strongly reduced, suggesting that trap concentrations in the presence of Mg are suppressed, the excited state absorption signal, which we also relate to the traps, is higher. We offer a tentative explanation of this contradiction between the two experiments that involves a massive transfer of electrons from the Mg-related defects to the excited state absorption centers caused by the excimer pump itself.
Źródło:
Acta Physica Polonica A; 1999, 95, 3; 403-412
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
From Acoustic Waves to Microwaves
Autorzy:
Mendes Pacheco, G.
Salvi Sakamoto, J.
Kitano, C.
Powiązania:
https://bibliotekanauki.pl/articles/1377945.pdf
Data publikacji:
2015-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
43.35.Sx
42.79.Jq
51.40.+p
42.79.-e
43.35.Zc
84.40.-x
85.60.-q
Opis:
We present here some results of our research related to the optoelectronics and photonics and show all the experimental setups used. Starting with a discussion on the importance of the waves, we demonstrate our achievements based on employment of acoustic, optical, and microwaves and their technological use. The results concern the acousto-optic and electro-optic effects. The generalized analysis of the electro-optic effect reveals a new high induced birefringence in lithium niobate. A patented optical fiber microphone is presented, and its applications to the measurements of acoustic wave velocity in gases and in the laser ultrasound non-destructive evaluation system are discussed. Finally, the generation of microwaves by an optical method with substantial cost reduction is presented.
Źródło:
Acta Physica Polonica A; 2015, 127, 1; 25-28
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 45

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