Relevant bibliographies by topics / Optická vlna

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  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers
  5. Reports

Academic literature on the topic 'Optická vlna'

Author: Grafiati
Published: 4 June 2021
Last updated: 10 February 2022

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Journal articles on the topic "Optická vlna"

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Msongaleli, Dawson, Kerem Kucuk, and Adnan Kavak. "Adaptive Polling Medium Access Control Protocol for Optic Wireless Networks." Applied Sciences 9, no. 6 (2019): 1071. http://dx.doi.org/10.3390/app9061071.

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The emergence of optical wireless networks (OWNs) is a potential solution to the quest for the increasing bandwidth demand. Existing bandwidth assignment strategies are not suitable for OWNs, considering factors such as differences between the physical properties of radio networks and OWNs. In order to eliminate collision, minimize delay and enhance system utilization and fairness, we propose the non-contention bandwidth assignment protocol called adaptive polling medium access control (APMAC) protocol for OWNs. The APMAC protocol involves association, data transmission and dissociation phases
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Wrobel, J. M., R. C. Walker, and A. H. Bridle. "The relativistic Jet in M84." Symposium - International Astronomical Union 175 (1996): 131–32. http://dx.doi.org/10.1017/s0074180900080311.

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The elliptical galaxy M84 (NGC 4374, UGC 07494) hosts an FR-I radio continuum source (Laing & Bridle 1987, MNRAS, 228, 557) and a dusty, warped optical emission line “disk” (Baumet al.1988, ApJS, 68, 643; Goudfrooijet al.1994, A&ApS, 105, 341). HST imaging shows that the inner dust distribution is not relaxed, but filamentary and complex (Jaffeet al.1994, AJ, 108, 1567). M84 is a member of the Virgo Cluster, at which distance 1 arcsec = 73 pc independent of Hubble's constant (Jacobyet al.1990, ApJ, 356, 332). Our VLA imaging, at 6 cm with a resolution of 500 mas (36 pc) FWHM, shows tha
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Beasley, A. J., V. Dhawan, E. B. Fomalont, R. C. Walker, and J. M. Wrobel. "The VLBA Calibrator Survey." Symposium - International Astronomical Union 175 (1996): 527–28. http://dx.doi.org/10.1017/s0074180900081730.

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Using phase-referencing, the coherent integration time of VLBI observations can be substantially increased, permitting observations of weaker (≃mJy) target sources (see e.g. Beasley & Conway 1995). The position of a source can also be accurately measured relative to a reference source, allowing absolute and proper-motion measurements, optical-radio image alignment, and alignment of images made at different frequencies.
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Kovalevsky, J. "Optical-Radio Reference Ties." International Astronomical Union Colloquium 165 (1997): 447–48. http://dx.doi.org/10.1017/s0252921100046935.

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In the course of the Hipparcos data reduction, the system of coordinates obtained is the result of complicated and partly random processes. It is therefore an arbitrary system which could not be retained. It was decided to compute a rotation ϵ at epoch (1991.25) and a time-dependent rotation ω (or spin) such that, when applied, it would be a realisation of the IAU extragalactic reference system as defined in 1991 and implemented by IERS in 1995.A working group was set up by the Hipparcos Science Team with the task to provide these rotations from all possible techniques. Actually eleven indepen
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Yang, Jun, Zsolt Paragi, Robert J. Beswick, et al. "A compact core-jet structure in the changing-look Seyfert NGC 2617." Monthly Notices of the Royal Astronomical Society 503, no. 3 (2021): 3886–95. http://dx.doi.org/10.1093/mnras/stab706.

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ABSTRACT The nearby face-on spiral galaxy NGC 2617 underwent an unambiguous ‘inside–out’ multiwavelength outburst in Spring 2013, and a dramatic Seyfert-type change probably between 2010 and 2012, with the emergence of broad optical emission lines. To search for the jet activity associated with this variable accretion activity, we carried out multiresolution and multiwavelength radio observations. Using the very long baseline interferometric (VLBI) observations with the European VLBI Network at 1.7 and 5.0 GHz, we find that NGC 2617 shows a partially synchrotron self-absorbed compact radio cor
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Denn, G., and R. Mutel. "VLBA Studies of BL Lac." Symposium - International Astronomical Union 175 (1996): 41–42. http://dx.doi.org/10.1017/s0074180900079936.

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The radio core of BL Lac has been monitored with VLBI techniques since 1980. At least seven superluminal events have been seen, usually associated with flux outbursts. The components have been interpreted as weak relativistic shocks associated with opposed jets. Recent dramatic changes in the nucleus of BL Lac have been seen: optical spectra (Lawrence et al. 1995) show the presence of broad-line Hα and [NII] emission lines. The single-dish radio flux has also increased by 3 times in the past year. Often in BL Lac's past, a flux outburst immediately precedes the ejection of a new superluminal c
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Walter, H. G., R. Hering, H. Lenhardt, Chr deVegt, D. R. Florkowski, and K. J. Johnston. "Accuracy Assessment of Hipparcos Optical and VLA Radio Positions of Stars." Symposium - International Astronomical Union 156 (1993): 377–80. http://dx.doi.org/10.1017/s007418090017353x.

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Optical positions of some 30 radio stars derived from 12 months of HIPPARCOS measurements are compared with their radio positions obtained with the Very Large Array (VLA). — Once the lengths of arcs between optical and radio positions of pairs of stars are calculated the differences of the arcs are formed. They provide an estimate of the coincidence of the optical and radio emission centres. — From the comparison of optical and radio positions infinitesimal rotation angles of the HIPPARCOS frame with respect to the VLA extragalactic reference frame are determined by rigid rotations. After taki
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Troitskiy, I. S., D. A. Morozova, S. G. Jorstad, et al. "Multiwavelength Observations of 6 FSRQ in 2008–2012." Proceedings of the International Astronomical Union 9, S304 (2013): 249–51. http://dx.doi.org/10.1017/s1743921314003974.

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AbstractWe present results of 4 years of VLBA monitoring along with γ-ray and optical R-band photometric observations of 6 blazars (0420-014, 1156+295, 1222+216, PKS 1510-089, 1633+382 and CTA 102). We have analyzed total intensity images obtained with the VLBA at 43 GHz and investigated kinematic evolution of the pc-scale jets of the sources. For all sources we compare flux variations in the VLBI core and bright superluminal knots with γ-ray and optical light curves. The majority of γ-ray flares are coincident with the appearance of a new superluminal knot and/or a flare in the millimeter-wav
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Vigotti, M., S. G. Djorgovski, L. Gregorini, et al. "The B3-VLA Sample." Symposium - International Astronomical Union 175 (1996): 519–21. http://dx.doi.org/10.1017/s0074180900081705.

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The use of radio sources to identify the most distant object in the Universe has been proved to be a very successful approach in observational cosmology. Studies of high flux, powerful 3CR and 1-Jy galaxies show dramatic evidence for color and luminosity evolution, reaching to look-back times 80% of the Hubble time. In order to disentangle the selection effect, correlation with redshift, and correlation with radio power, it is necessary to obtain well defined, complete samples of radio galaxies at a large range of redshifts, and with a wide baseline of radio power. We need the identifications
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Whiteoak, J. B., and F. F. Gardner. "VLA Observations of NGC 5793." Publications of the Astronomical Society of Australia 7, no. 1 (1987): 88–91. http://dx.doi.org/10.1017/s1323358000021913.

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AbstractThe edge-on spiral galaxy NGC 5793 has been observed at frequencies of 4860 and 14940 MHz with the Very Large Array. The corresponding half-intensity beamwidths in the final maps were 0.65 × 0.40 and 0.19 × 0.11 arcsec2. The maps show a continuum source close to the optical nucleus with dimensions of ≤0.01 and 0.04 arcsec in right ascension and declination. The average spectral index is –0.6.
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Dissertations / Theses on the topic "Optická vlna"

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Hantl, Josef. "Tvarování laserového svazku." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2011. http://www.nusl.cz/ntk/nusl-219125.

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Thesis describes shortly types of waves and beams. Gaussian beam properties and parameters are described in more details, Gaussian beam is the most used in atmospheric optical links. The main goal of work is studying of possibilities of laser beam shaping, mainly the beam Top hat. In this project reasons why is suitable to shape laser beam for optical communications and the most used methods for shaping of laser beam are described. The suggested processes of beams shaping are experimentally verified and properties of beams shaped of single methods are compared with each other.
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Vitásek, Jan. "Měření rozložení optické intenzity ve vzdálené zóně." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2009. http://www.nusl.cz/ntk/nusl-217789.

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The topic of this master’s thesis is energy measurement of the optical intensity distribu-tion at the far field. Properties of the optical intensity and the optical power are described. In this thesis solution of wave equation is done. The plane wave, spherical wave and Gaussian beam are described. In this thesis, optical trace of laser beam from transmitter laser diode to receiver PIN photodiode is described. One of the solved problems is diffraction on the lens socket. The basic configuration for diffraction investigation on lens socket was created. There were transmitting laser diode, stop
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Maluš, Miroslav. "Komplexní model turbulence pro různé velikosti cel." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2021. http://www.nusl.cz/ntk/nusl-442416.

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This diploma thesis is about creating a program to model turbulent cells of different sizes on the chosen transmission path. The initial part of the work is devoted to the formation of atmospheric turbulence and the mathematical description of the extent of turbulence and its effect on optical waves. The methods of the turbulence generation and their physical description of formation are described below. The practical part is devoted to the created program in the MATLAB.
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Wadadekar, Y. G. "Optical studies of VLA FIRST Survey sources /." Pune, India : Pune University, 2000. http://69.63.217.22/elibsql06_N10017_Documents/00000000033045.pdf.

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Wojewoda, Ondřej. "Měření fáze spinových vln pomocí Brillouinova rozptylu světla: vývoj zařízení a jeho aplikace." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2020. http://www.nusl.cz/ntk/nusl-417148.

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Spinové vlny mají potenciál být použity jako nová platforma pro přenos a zpracování dat, protože mohou dosáhnout vlnových délek v rozsahu nanometrů a frekvencí v rozsahu terahertzů. K tomu, aby bylo možné navrhnout zařízení a logické obvody založené na spinových vlnách, je zapotřebí získat informace o prostorovém rozložení intenzity spinové vlny a pokud je to možné, také o jejich fázi. To lze měřit pomocí fázově rozlišeného fokuso-vaného Brillouinova rozptylu světla (µ -BLS). Předložená práce se zabývá rozšířením stávající optické sestavy o možnost měření fáze, kde doposud bylo možné měřit pou
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Fučík, Milan. "Optovláknový zdroj laserového záření." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2013. http://www.nusl.cz/ntk/nusl-220254.

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This master’s thesis deals with parameters and properties of electromagnetic wave, its spread in environment and then in optical fiber, as well with optical fibers. Principle of laser sources and a issues of coupling a optical performance into optical fiber are described here. Next a function of laser diodes, power and cooling requirements are described. A block diagram of fiber optic source of laser radiation is designed as well as a circuit solution of every single block with respecting of parameters and sensitivity of used laser diode. The protection of laser diode and high-frequency modula
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Prudík, Jiří. "Model metropolitní optické sítě." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2008. http://www.nusl.cz/ntk/nusl-217666.

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The purpose of this master’s thesis is foremost to provide a simple guide how to build elements of optical metropolitan area network. The basic model consists to sequence of construction, network topology, passive and active parts. The collection contains examples of alternative technology such as Wireless LAN with different frequency. The optical network construction based on optical cable, fibres, splices, trays, adapters, connectors and active parts for example a lot of media convertor models. After that there are demonstrating type of wavelength division multiplexer used in metropolitan ar
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Vaněk, Stanislav. "Měření seismické činnosti pomocí optických vláknových senzorů." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2018. http://www.nusl.cz/ntk/nusl-376912.

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The aim of master's thesis is to get familiarized with the problems of measurement and analysis of seismic waves. Theoretical part deals with the description of seismic waves, especially their types, sources and properties. Attention was afterwards focused on the measurement systems of these waves, emphasis was placed on their principles and advantages. The practical part discusses methods of noise reduction and highlighting of significant events in measured data. At the end, individual methods are implemented into user-friendly graphical interface.
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Bezděková, Barbora. "Elektromagnetické vlny v disperzních a refraktivních relativistických systémech." Master's thesis, 2019. http://www.nusl.cz/ntk/nusl-405008.

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Study of light rays (light world lines) plays a significant role in many of astro- physical applications. Light rays are mainly studied in terms of so-called grav- itational lensing. However, the majority of studies are mainly focused on light propagation in vacuum. If the refractive and dispersive medium characterised by refractive index n is considered, effects occurring due to the medium presence need to be taken into account, which significantly complicates the problem. In the present thesis, rays propagating through simple refractive and dispersive systems, such as plane differentially sh
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Hons, Claudio Moises Paulo. "Radio-optical analysis of extended radio sources in the first look survey field." Thesis, 2010. http://hdl.handle.net/11394/3453.

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>Magister Scientiae - MSc<br>I combine 610 MHz Giant Metrewave Radio Telescope (GMRT) data, 1.4 GHz Very Large Array (VLA) data and 1.4 GHz Westerbork Synthesis Radio Telescope (WSRT) observations, encompassing a ∼ 4 square degree field (sq. deg. field) centred on the verification strip of the Spitzer First Look Survey (FLS) field (RA = 17h18m00s, Dec = 59◦30′30′′), to study radio sources down to fluxes of about 0.1 mJy. The results of an analysis of a sample of 107 multi-component radio sources obtained by cross-correlating the VLA and GMRT catalogues are shown. The spectral index analysis
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Book chapters on the topic "Optická vlna"

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Walter, H. G., R. Hering, H. Lenhardt, Chr de Vegt, D. R. Florkowski, and K. J. Johnston. "Accuracy Assessment of HIPPARCOS Optical and VLA Radio Positions of Stars." In Developments in Astrometry and Their Impact on Astrophysics and Geodynamics. Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1711-1_69.

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Kolman, Michiel, Jules P. Halpern, Chris R. Shrader, Alexei V. Filippenko, Henner H. Fink, and Stephan G. Schaeidt. "Simultaneous Rosat, Ginga, VLA, IUE, and Optical Observations of the Bright Quasar H1821 + 643." In Astrophysics and Space Science Library. Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-011-0794-5_115.

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Kapahi, V. K., C. R. Subrahmanya, and S. D’Silva. "VLA Observations of an Optically Deep Sample of Molonglo Quasars: Aspect Dependence of the Optical Continuum." In Active Galactic Nuclei. Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-0963-2_166.

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Conference papers on the topic "Optická vlna"

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Liu, Minglai, Rujian Lin, and Jun Huang. "Design and FPGA implementation of VLAN in EPON." In Asia-Pacific Optical Communications, edited by S. J. Ben Yoo, Gee-Kung Chang, Guangcheng Li, and Kwok-wai Cheung. SPIE, 2005. http://dx.doi.org/10.1117/12.574204.

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Wu, Juan, Hiroki Ikeda, Osamu Takada, and Hideya Yoshiuchi. "Automatic VLAN translation service over Ethernet passive optical network." In Asia-Pacific Optical Communications, edited by Yong Hyub Won, Gee-Kung Chang, Ken-ichi Sato, and Jian Wu. SPIE, 2006. http://dx.doi.org/10.1117/12.688835.

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Wang, Li. "Safety management of Ethernet broadband access based on VLAN aggregation." In Asia-Pacific Optical and Wireless Communications, edited by S. J. Ben Yoo, Kwok-wai Cheung, Yun-Chur Chung, and Guangcheng Li. SPIE, 2004. http://dx.doi.org/10.1117/12.523484.

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Muqaddas, A. S., A. Giorgetti, R. S. Tessinari, et al. "OpenConfig-extension for VLAN-based end-to-end network slicing over optical networks." In Optical Fiber Communication Conference. OSA, 2020. http://dx.doi.org/10.1364/ofc.2020.m3z.1.

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Zhang, Xiaolan J., Rohit Wagle, and James Giles. "VLAN-Based Routing Infrastructure for an All-Optical Circuit Switched LAN." In GLOBECOM 2009 - 2009 IEEE Global Telecommunications Conference. IEEE, 2009. http://dx.doi.org/10.1109/glocom.2009.5425398.

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Zhu, Min, Junni Zou, and Rujian Lin. "A Novel Implementation of VLAN-Based Multicast Carried on LLID in EPON." In 2006 Asian Optical Fiber Communication & Optoelectronic Exposition & Conference. IEEE, 2006. http://dx.doi.org/10.1109/aoe.2006.307342.

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Syed, Zeba, R. Vikram Raju, Sandeep Joshi, and Jeril Kuriakose. "A novel approach to naval architecture using 1G VLAN with RSTP." In 2014 Eleventh International Conference on Wireless and Optical Communications Networks (WOCN). IEEE, 2014. http://dx.doi.org/10.1109/wocn.2014.6923086.

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Rafel, A., P. Wright, K. Farrow, D. Nesset, and N. Parkin. "Automatic Restoration over a Type B Dual Parented PON Using VLAN Switching." In 39th European Conference and Exhibition on Optical Communication (ECOC 2013). Institution of Engineering and Technology, 2013. http://dx.doi.org/10.1049/cp.2013.1430.

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Kikuta, Kou, Daisuke Ishii, Satoru Okamoto, and Naoaki Yamanaka. "Point-to-Multipoint VLAN path signaling demonstration on the GMPLS controlled Ethernet test network." In National Fiber Optic Engineers Conference. OSA, 2010. http://dx.doi.org/10.1364/nfoec.2010.nthe2.

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Kikuta, Kou, Masahiro Nishida, Daisuke Ishii, Satoru Okamoto, and Naoaki Yamanaka. "Establishment of VLAN Tag Swapped Path on GMPLS controlling Wide Area Layer-2 Network." In National Fiber Optic Engineers Conference. OSA, 2009. http://dx.doi.org/10.1364/nfoec.2009.jwa83.

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Reports on the topic "Optická vlna"

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Wrobel, J. M., Greg B. Taylor, T. A. Rector, S. T. Myers, and C. D. Fassnacht. Faint Radio Sources in the NOAO Bootes Field. VLBA Imaging And Optical Identifications. Office of Scientific and Technical Information (OSTI), 2005. http://dx.doi.org/10.2172/890431.

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