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Wyświetlanie 1-15 z 341
Tytuł:
On a method to employ Newton’s Rings concept to determine thickness of thin films
Autorzy:
Raveesha, K. H.
Doddamani, V. H.
Prasad, B. K.
Powiązania:
https://bibliotekanauki.pl/articles/412571.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Interference
fringes
destructive interference
constructive interference
air wedle
Opis:
Newton’s Rings experiment is traditionally utilized to find radius curvature of a lens. We propose a method in which this same set up can be used to find the thickness of thin films. The working principle is interference. It is based on the fact that, the formation of bright and dark interference fringes is a measure of the thickness of the air film at that point. We present the experimental data. The results from the experiment are in agreement with results obtained through geometry. Further, a method to improvise conventional interference at air wedge experiment which is generally used to determine the thickness of thin films is suggested.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 3; 1-7
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Interference between helicopter and its surroundings, experimental and numerical analysis
Autorzy:
Łusiak, T.
Dziubiński, A.
Szumański, K.
Powiązania:
https://bibliotekanauki.pl/articles/1943197.pdf
Data publikacji:
2009
Wydawca:
Politechnika Gdańska
Tematy:
loadings
interference
helicopter
Opis:
The paper describes the phenomenon of the occurrence of aerodynamic interference between a helicopter and an object in its near vicinity. Such situations occur during rescue missions as well as during police and military operations when the helicopter flies near such objects as buildings and ships. The specific shape of the example object, a typical town courtyard, is discussed below. The influence of the interference on the rotor and fuselage loading, air flow and flying qualities was analyzed for these special cases of helicopter operations. The results of the computations performed using the FLUENT software in terms of the dynamic response to disturbances on the simulation model of a helicopter rotor have been presented. The model used in these calculations made it possible to analyze flexible rotor blades. The results of the experimental tests of interference between the helicopter model and different shapes have been attached, as well.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2009, 13, 4; 379-392
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
ICBCA – Improved Cluster Based Channel Allocation in Cognitive Radio Sensor Networks
Autorzy:
Agarkhed, Jayashree
Gatate, Veeranna
Powiązania:
https://bibliotekanauki.pl/articles/308481.pdf
Data publikacji:
2020
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
channel interference
channel overlapping
co-channel interference
cognitive radio
Opis:
Wireless sensor networks (WSNs) operate in an overcrowded electromagnetic environment, as the spectrum is shared by various wireless communication technologies. This gives rise to various challenges related to optimized and efficient spectrum utilization. Cognitive radio (CR) has emerged as a solution satisfying this requirement, as it is capable of adapting to the dynamic radio spectrum. Thanks to the deployment of cognitive radio in WSNs, the spectrum may be utilized in a more efficient manner. CR may identify the vacant channels dynamically, allowing the sensor nodes to effeectively communicate with each other. In this paper a clustering algorithm known as improved cluster-based channel assignment (ICBCA) is implemented, forming clusters of CR sensor nodes and then selecting vacant channels for data transmission purposes. Simulation results show that ICBCA outperforms existing clustering algorithms in CR sensor networks.
Źródło:
Journal of Telecommunications and Information Technology; 2020, 3; 28-35
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Interferencias Morfosintácticas en la Producción Escrita de Estudiantes Hispanistas Polacos
Autorzy:
Niestorowicz, Tomasz
Powiązania:
https://bibliotekanauki.pl/articles/605818.pdf
Data publikacji:
2008
Wydawca:
Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
Tematy:
morphological interference
errors
Opis:
One of the main fields of studies within the framework of second language teaching methodology is an analysis of linguistic errors which constitute characteristic phenomenon of different stages throughout the teaching process. Although an error is a systematic deviation from the linguistic norm, it also seems to be an essential step in the second language acquisition. The main aim of this article is to present and analyse the most frequent errors occurring in essays written by Polish students. The analysis concentrates on morphosyntacic errors, since morphosyntax can be considered an area in which the greatest difficulties are to be noticed. The author describes and analyses errors in two problematic areas, namely in the use of articles and past tenses.
Źródło:
Lublin Studies in Modern Languages and Literature; 2008, 32; 273-281
0137-4699
Pojawia się w:
Lublin Studies in Modern Languages and Literature
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Model of the signal of the Galileo Satellite Navigation System
Autorzy:
Džunda, M.
Čikovský, S.
Melniková, L.
Powiązania:
https://bibliotekanauki.pl/articles/24201440.pdf
Data publikacji:
2023
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
Global Navigation Satellite System
navigation system
Galileo
E1 signal
interference
chaotic impulse interference
narrowband interference
simulation method
Opis:
This article presents an analysis of the Galileo E1 signal and its sensitivity to different types of interference. The research involved modeling white noise, chaotic impulse interference, and narrowband interference and the effects of these interfering signals on the E1 signal. Based on the available information, spectral structures were created for the mentioned types of interference, and subsequently, these interferences were integrated into the E1 signal in the Matlab program environment. A Kallman filter was used to filter out white noise from the additive mixture of the E1 signal and white noise. The research aimed to analyze the influence of white noise, chaotic impulse interference, and narrowband interference on the spectral power density of the E1 signal. The results of this work can be used in the design of robust receivers and signal structures capable of withstanding these types of interference.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2023, 17, 1; 51--59
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Intra- and inter-cell interference investigations for broadband radio access systems above 10 GHz
Autorzy:
Bose, R.
Hayn, A.
Jakoby, R.
Powiązania:
https://bibliotekanauki.pl/articles/308404.pdf
Data publikacji:
2001
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
multipath propagation
interchannel interference
Opis:
Local multipoint distribution systems (LMDS) operating above 10 GHz have a large bandwidth (2-3 GHz) but a very limited range. These systems can provide coverage to a few kilometers only. These systems can provide coverage to a few kilometers only. The size of the macro cells illuminated by the base stations, where line of sight (LOS) exists, is 1 to 6 km. To provide coverage to customers where LOS is not possible, repeaters or passive reflectors may be used. In this paper we present first results of reflection measurements at 42 GHz, and based on that, simple multipath studies, taking into account the beamwidth of the antennas of both, transmitter and receiver. Secondly, LOS cochannel and adjacent channel interference are assessed for cellular LMDS networks. As suggested in the CRABS report, the maximal spectral efficiency can be obtained with a dual frequency and polarization reuse plan. This frequency and polarization reuse leads to interference. In this paper we have first calculated the cochannel interference (CCI) and the adjacent channel interference (ACI) due to the frequency/polarization reuse schemes suggested in the CRABS report. The effects of the variation of the half power beam width (HPBW) of the receiver, the time precentage parameter p, and the cell radius on C/I are also reported. In the latter part of the paper we propose a simple interference reduction technique based on re-orientation of the receiver antennas. We have also explored the possibility of using trellis coded modulation (TCM) for reducing interference levels. Initial results have been found to be quite encouraging.
Źródło:
Journal of Telecommunications and Information Technology; 2001, 2; 10-20
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Some results concerning the ends of minimal cuts of simple graphs
Autorzy:
Jia, Xiaofeng
Powiązania:
https://bibliotekanauki.pl/articles/743739.pdf
Data publikacji:
2000
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
cut
fragment
end
interference
Opis:
Let S be a cut of a simple connected graph G. If S has no proper subset that is a cut, we say S is a minimal cut of G. To a minimal cut S, a connected component of G-S is called a fragment. And a fragment with no proper subset that is a fragment is called an end. In the paper ends are characterized and it is proved that to a connected graph G = (V,E), the number of its ends Σ ≤ |V(G)|.
Źródło:
Discussiones Mathematicae Graph Theory; 2000, 20, 1; 139-142
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of commutational interferences on the analysis of harmonics in the traction current
Autorzy:
Furman, Juliusz
Białoń, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/215115.pdf
Data publikacji:
2020
Wydawca:
Instytut Kolejnictwa
Tematy:
interference
EMC
traction
interoperability
Opis:
Commutation phenomena related to the processes of changing the amount of power taken or returned by a vehicle affect the frequency spectrum contained within the traction current. The paper presents the influence of selected physical phenomena on the parameters taken for FFT analysis utilized for assessment of the disturbances generated into the traction network. The paper also describes the stands used for measuring disturbances generated into the traction network. The results of the measurements and calculations of the frequency response of simulated signals are presented, as well as signals measured in real conditions during traction vehicle tests, which are useful for assessing the influence of commutational interferences on the analysis of harmonics in the traction current.
Źródło:
Problemy Kolejnictwa; 2020, 187; 87-97
0552-2145
2544-9451
Pojawia się w:
Problemy Kolejnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Просодическая интерференция в устноречевом общении на китайском языке
Prosodic Interference in Chinese Speech
Interferencja prozodyczna w komunikowaniu się w języku chińskim
Autorzy:
Галыня, Ирина
Powiązania:
https://bibliotekanauki.pl/articles/2118272.pdf
Data publikacji:
2014-12-30
Wydawca:
Uniwersytet w Białymstoku. Wydawnictwo Uniwersytetu w Białymstoku
Tematy:
interferencja
system prozodyczny
interferencja prozodyczna
faktor
błąd
interference
prosodic systems
prosodic interference
Opis:
W artykule poddano analizie zjawisko interferencji prozodycznej, które występuje w mowie rosyjskojęzycznych studentów, uczących się języka chińskiego. Autorka scharakteryzowała chiński i rosyjski system prozodyczny, określiła podstawowe różnice funkcjonalne dzielące te systemy, co pozwoliło wskazać czynniki powodujące interferencję.
The article is aimed at analyzing language interference on the phonological level. The author highlights the reasons, accounting for the breach of the prosodic norms of Chinese speech, refers to interlinguistic, intralinguistic and extralinguistic factors of language interference. The article under consideration includes analysis of Chinese and Russian prosodic systems, thus, revealing the principal functional differences between the systems and prosodic phenomena undergoing interference in the Chinese speech of Russian speaking students.
Źródło:
Białostockie Archiwum Językowe; 2014, 14; 25-38
1641-6961
Pojawia się w:
Białostockie Archiwum Językowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Urządzenia zakłócające w walce z terroryzmem
Jamming equipment on fight against terrorism
Autorzy:
Szugajew, L.
Jarzemski, J.
Powiązania:
https://bibliotekanauki.pl/articles/235263.pdf
Data publikacji:
2005
Wydawca:
Wojskowy Instytut Techniczny Uzbrojenia
Tematy:
urządzenia zakłócające
terroryzm
interference device
terrorism
Opis:
W artykule przedstawiono urządzenia zakłócające (zagłuszające) jako jeden ze sposobów walki ze skutkami terroryzmu.
The jamming equipment is presented in the paper as a way to fight against terrorism.
Źródło:
Problemy Techniki Uzbrojenia; 2005, R. 34, z. 96; 159-163
1230-3801
Pojawia się w:
Problemy Techniki Uzbrojenia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Lessons Learned from WiMAX Deployment at INEA
Autorzy:
Kowalik, K.
Dudek, D.
Kołodziejski, M.
Musznicki, B
Grzybek, E.
Jarzina, J.
Powiązania:
https://bibliotekanauki.pl/articles/308259.pdf
Data publikacji:
2014
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
interference
radio capacity
radio planning
WiMAX
Opis:
Home broadband access is continuously demanding more bandwidth fueled by video streaming, entertainment and gaming applications. In 2010, a company INEA decided to roll-out new WiMAX-based services aimed to meet the needs of home users across theWielkopolska region of western Poland. It was decided to follow the 802.16e standard and the Time Division Duplexing (TDD) mode that oer the ability to adjust the downlink/uplink ratio and thus are well suited for data transmission. After an extensive testing period of equipment from various vendors, engineers at INEA have chosen the Motorola (currently Cambium Networks) PMP320 solution because it is compact and its components are space- and energy-ecient. The company choice was also influenced by its simple operation, management and installation, which ensured low costs of ownership. So far, this deployment has provided fast and aordable connectivity for Internet and telephony services to around 5,500 households across the 30,000 sq. km region. After 3 years of experience, INEA would like to share the lessons learned from this roll-out.
Źródło:
Journal of Telecommunications and Information Technology; 2014, 3; 34-41
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Performance of CDMA systems with Walsh and PN coding
Autorzy:
Gajewski, P.
Dołowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/308358.pdf
Data publikacji:
2001
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
PN spreading
CDMA
multi-access interference
Opis:
Wideband CDMA method has been recently investigated for its using in the future communication systems. Such systems capacity depends on many factors, the main is multi-access interference (MAI). MAI is an inherent CDMA property connected to correlation characteristics of codes used to access and to spreading. The influence on CDMA performance of these codes families and parameters is presented in this paper. The standard Gaussian approximation has been used for interference analysis. Bit error rate (BER) on detector output is a measure of interference influence on transmission quality. It can be used for SNR(i) evaluation on receiver input for channel assignment and handover procedures. The results of interference analysis for the pseudo-noise sequences (M-sequences, Gold, de'Bruin and Jennings) as well as for the Walsh orthogonal mapping are presented in this paper.
Źródło:
Journal of Telecommunications and Information Technology; 2001, 2; 41-45
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Polarization effects in K+–Na+ ion exchanged MMI structures with absorption cover
Autorzy:
Szewczuk, A.
Blahut, M.
Powiązania:
https://bibliotekanauki.pl/articles/175005.pdf
Data publikacji:
2013
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
multimode interference
optical sensors
modal attenuation
Opis:
The paper concerns the polarization effects in gradient index MMI sensor structures made by ion K+–Na+ exchange. It has been shown both experimentally and based on the numerical calculation that for the K+–Na+ ion exchanged MMI structures, propagation conditions of light in multimode section vary considerably for each polarization. There are presented the possibilities of using this effect in application to gas sensing. Analyzed sensor structures are covered by WO3 absorbing nanolayers. Numerical analyses of MMI sensor are performed and modal attenuation coefficients are determined. The comparison between operation characteristics obtained for the TE and TM polarization is presented.
Źródło:
Optica Applicata; 2013, 43, 3; 441-452
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical analysis of planar multimode optical sensor with active nanolayer
Autorzy:
Błahut, Marek
Powiązania:
https://bibliotekanauki.pl/articles/1835808.pdf
Data publikacji:
2021
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
multimode interference
optical sensor
planar waveguide
Opis:
In the paper, numerical studies of the model of an optical sensor, based on interference of modes in a planar one-dimensional step-index configuration, are presented. Calculations are performed using the method of mode field analysis. The structure consists of the single-mode input waveguide, the multimode waveguide that guides only a few modes and the single-mode output waveguide.The structure is covered by a nanometer active sensor layer of a high refractive index, which changes its optical properties in contact with the measured external surrounding. The refractive index variation of an active sensor layer affects the modal properties of the multimode waveguide and the output optical field distribution. By the proper selection of the active layer, the considered configuration can be used for gas detection.
Źródło:
Optica Applicata; 2020, 50, 3; 377-390
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 341

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