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Wyszukujesz frazę "42.15.Eq" wg kryterium: Temat


Wyświetlanie 1-7 z 7
Tytuł:
Video on Demand Over Optical Wireless Communication Links
Autorzy:
Siraj, M.
Memon, M.
Khan, M.
Powiązania:
https://bibliotekanauki.pl/articles/1191713.pdf
Data publikacji:
2016-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
84.40.Ua
42.15.Eq
Opis:
Video on demand technology is a modern wireless communication application which requires a large bandwidth. Optical wireless networks, as a potential alternative to radio frequency, is an emerging technology that is easier to set up and provides a cost effective solution, where a physical network is difficult to deploy. Optical wireless networks can be used as a backbone to provide the much needed bandwidth for video on demand application. In this paper, Wavelength Division Multiplexing modulation scheme is proposed for the optical wireless networks due to its significance of transmitting distinct data channels at different wavelengths. Wavelength Division Multiplexing can be easily integrated with optical wireless networks, consequently resulting in an increased data rate. This paper presents a novel approach of integrating video on demand with the state of art Wavelength Division Multiplexing based optical wireless networks. Furthermore, the paper discusses the challenges and advantages over the convention modulation schemes.
Źródło:
Acta Physica Polonica A; 2016, 129, 4; 826-828
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Externally Liquid-Filled Photonic Crystal Fibers with High Output Intensity and Low Confinement Loss
Autorzy:
Hosseinpour, M.
Zendehnam, A.
Powiązania:
https://bibliotekanauki.pl/articles/1030229.pdf
Data publikacji:
2017-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.81.-i
42.81.Pa
42.15.Eq
Opis:
In this study, a Gaussian function is used to approximate the output intensity profiles of the externally liquid-filled photonic crystal fibers with various configurations. By decreasing the diameters of the five outer rings of the proposed photonic crystal fibers, the output intensity values are shown to be considerably increased for all of the studied configurations. A very high output intensity value with very low confinement loss (roughly 0 dB/m) can be achieved at λ =1.55 μ m by an appropriate design for the externally liquid-filled PCF with nanostructure.
Źródło:
Acta Physica Polonica A; 2017, 131, 6; 1431-1438
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Construction of Magnetic Dichroism Beam Line in Trieste
Autorzy:
Lama, F.
Powiązania:
https://bibliotekanauki.pl/articles/1963357.pdf
Data publikacji:
1997-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.79.Yd
42.15.Eq
07.85.Qe
Opis:
The described synchrotron radiation beam line, based on a double mono-chromator with different incidence angles, has been devised to ally in a short length the working possibilities of both vacuum ultraviolet and soft X-ray monochromators as well as to preserve the degree of circular polarization of the radiation emitted by the source. The design philosophy and the predicted performances of the diffraction and the focusing systems are described and the heat load on the beam line optical elements is discussed. Some practical details concerning the beam line, now under construction, are presented.
Źródło:
Acta Physica Polonica A; 1997, 91, 4; 723-729
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Aperiodically Poled Nonlinear Crystals as Sources of Multi-Frequency Laser Radiation
Autorzy:
Novikov, A. A.
Laptev, G. D.
Powiązania:
https://bibliotekanauki.pl/articles/2047885.pdf
Data publikacji:
2007-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.25.-p
42.15.Eq
42.65.-k
42.79.Nv
Opis:
The new multi-frequency process, which consists of three coupled nonlinear optical interactions: two parametric down-conversions and one up-conversion, in aperiodically poled nonlinear crystal is investigated. The spatial dynamics of wave intensities is studied in detail. The possibility of secondary simplification of coupled equations for correct describing the dynamics of wave interactions is demonstrated. The optimal conditions for parametrical instability of the initial stage of wave interactions are found.
Źródło:
Acta Physica Polonica A; 2007, 112, 5; 1073-1078
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Construction of Two-Axis Goniophotometer for Measurement of Spatial Distribution of a Light Source and Calculation of Luminous Flux
Autorzy:
Sametoglu, F.
Powiązania:
https://bibliotekanauki.pl/articles/1504597.pdf
Data publikacji:
2011-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.15.Eq
07.60.-j
06.20.F-
07.60.Dq
Opis:
A two-axis goniophotometer is constructed at National Metrology Institute of Turkey (TUBITAK UME) for characterizing photometric properties of compact light sources. With the new device, total luminous flux emitted by a light source at both cap-up or cap-down mounting positions is calculated from the integration of the illuminance values E( θ, φ) measured on the goniometric spherical surface. The internal calibration of the system is performed by means of two calibrated light sources with known luminous flux values. The constructed system is also capable of measuring the luminous intensity distribution values I( θ, φ) of compact light sources. The uncertainty analyses of the luminous flux measurements as well as the internal calibration of the instrument are also presented herein.
Źródło:
Acta Physica Polonica A; 2011, 119, 6; 783-791
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:
Investigation of $H_2:CH_4$ Plasma Composition by Means of Spatially Resolved Optical Spectroscopy
Autorzy:
Bogdanowicz, R.
Powiązania:
https://bibliotekanauki.pl/articles/1811532.pdf
Data publikacji:
2008-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
85.60.-q
42.81.-i
07.57.-c
42.15.Eq
32.30.-r
52.50.Sw
81.05.Uw
Opis:
The system based on spatially resolved optical emission spectroscopy dedicated for in situ diagnostics of plasma assisted CVD processes is presented in this paper. Measurement system coupled with chemical vapour deposition chamber by dedicated fiber-optic paths enables investigation of spatial distribution of species densities ($H_x$, $H^+$, CH, $CH^+$) during chemical vapour deposition process. Experiments were performed for a various gas inlet configuration at range of microwave power up to 800 W. Spatially resolved optical spectroscopy results showed that inlet configuration based on injecting hydrogen in ECR region and methane in substrate area is the most efficient for $H^+$ and $CH_{3}^{+}$ excitation. The designed prototype of the spatially resolved optical spectroscopy system enables the high-sensitivity measurements of concentration of the species in the microwave plasma and can be used for optimisation of diamond-like carbon synthesis.
Źródło:
Acta Physica Polonica A; 2008, 114, 6A; A-33-A-38
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-7 z 7

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