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Wyszukujesz frazę "spectrum" wg kryterium: Temat


Tytuł:
Flexible spectrum use and laws of physics
Autorzy:
Strużak, R.
Powiązania:
https://bibliotekanauki.pl/articles/317656.pdf
Data publikacji:
2013
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
radio frequency spectrum
spectrum management
flexible spectrum use
Opis:
This note refers to flexible-use spectrum rights that would allow the radio frequency spectrum to be traded, aggregated, divided and freely used for a wide range of user-selected services. So far, discussions on that approach have largely focused on economic aspects, without due consideration of physical realizability. We argue here that additional spectrum management rules are required to assure compatible coexistence of radio systems in congested environments.
Źródło:
Telekomunikacja i Techniki Informacyjne; 2013, 3; 67-72
1640-1549
1899-8933
Pojawia się w:
Telekomunikacja i Techniki Informacyjne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spectrum management. Part 1
Autorzy:
Strużak, R.
Powiązania:
https://bibliotekanauki.pl/articles/317730.pdf
Data publikacji:
2013
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
spectrum management
radio frequency spectrum resources
Opis:
As preparations for the Year 2000 World Radiocommunication Conference continue in earnest, ITU News will bring you in-depth analyses of what is at stake in the complex radio world. Indeed, how the spectrum/orbit resources are used and managed has a profound impact on society, its prosperity, security, culture, and education. This article takes you back in history on the use, management and regulation of the radio frequency spectrum resources. It then discusses current trends.
Źródło:
Telekomunikacja i Techniki Informacyjne; 2013, 3; 53-57
1640-1549
1899-8933
Pojawia się w:
Telekomunikacja i Techniki Informacyjne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On Radio-Frequency Spectrum Management
Autorzy:
Strużak, R.
Tjelta, T.
Borrego, J. P.
Powiązania:
https://bibliotekanauki.pl/articles/308539.pdf
Data publikacji:
2016
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
radio frequency spectrum
spectrum management
wireless system
Opis:
This article review lessons learned from the uses of radio-frequency (RF) spectrum at national and international scales. Its main purpose is to stimulate debate on how to allow new wireless systems to operate, and to reduce the chronic apparent shortage of RF spectrum. The article aims at a better understanding of the mechanisms behind spectrum management and their pertinence to the public interest. The main contributions if the article are: • Considering RF spectrum management as a construct that structures radio services and, at the same time, distributes wealth and power; • Highlighting major doctrines of RF spectrum management; • Promoting spectrum management directly by its users; • Promoting cooperation and transparency. The several parts of the paper include the evolution of spectrum exploitation, and a foreseeable future by taking a closer look at major dilemmas and challenges. The paper ends with general comments and conclusions.
Źródło:
Journal of Telecommunications and Information Technology; 2016, 3; 108-130
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Perturbation of the spectrum οf an essentially selfadjoint operator
Autorzy:
Pokrzywa, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/1340681.pdf
Data publikacji:
1993
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
crossnorm
spectrum
Opis:
The aim of this paper is to find estimates of the Hausdorff distance between the spectra of two nonselfadjoint operators. The operators considered are assumed to have their imaginary parts in some normed ideal of compact operators. In the case of the classical Schatten ideals the estimates are given explicitly.
Źródło:
Applicationes Mathematicae; 1993-1995, 22, 1; 75-89
1233-7234
Pojawia się w:
Applicationes Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Trends in Use of RF Spectrum
Autorzy:
Strużak, R.
Powiązania:
https://bibliotekanauki.pl/articles/308169.pdf
Data publikacji:
2009
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
radio communication hyperspace
radio frequency spectrum resources
radio regulations
spectrum engineering
spectrum management
Opis:
This paper reviews possible improvements in the use of radio waves for carrying information from an engineering viewpoint. A few new concepts are proposed, which reduce the problem to an arrangement of solids in a multidimensional space.
Źródło:
Journal of Telecommunications and Information Technology; 2009, 4; 95-100
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The importance of FFT and BCS spectrums analysis for diagnosis and prediction of rolling bearing failure
Autorzy:
Nadabaică, D. C.
Nedeff, V.
Radkowski, S.
Mączak, J.
Powiązania:
https://bibliotekanauki.pl/articles/328404.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
FFT spectrum
BCS spectrum
rolling bearings
diagnose
prediction
Opis:
Dynamic equipments, in their vast majority, have rolling bearings in their components. Measurement and analysis of the values of rolling bearings vibration, on time, represent a safe and effective measure for identifying the state of wear of bearings, and to predict the evolution of their technical condition and of the entire equipment. This paper presents the detection of causes which lead to the damage of rolling bearing by using FFT (Fast Fourier Transformation) and BCS (Bearing Condition Signature) spectrums, by measuring its housing vibrations (self-aligning ball bearing, ZKL 1205K type) mounted in a test rig. The results presents the analysis mode of FFT and BCS spectrums in order to obtain beneficial information for the detection of that unbalance caused by loading, of the implemented defect on rolling bearing raceway and of bearing damage mode under the action of these causes.
Źródło:
Diagnostyka; 2013, 14, 4; 3-12
1641-6414
2449-5220
Pojawia się w:
Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the Spectral Characterizations of Graphs
Autorzy:
Huang, Jing
Li, Shuchao
Powiązania:
https://bibliotekanauki.pl/articles/31341668.pdf
Data publikacji:
2017-08-01
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
Laplacian spectrum
adjacency spectrum
cospectral graphs
spectral characterization
Opis:
Several matrices can be associated to a graph, such as the adjacency matrix or the Laplacian matrix. The spectrum of these matrices gives some informations about the structure of the graph and the question “Which graphs are determined by their spectrum?” is still a difficult problem in spectral graph theory. Let $ \mathcal{U}_p^{2q} $ be the set of graphs obtained from $ C_p $ by attaching two pendant edges to each of $ q (q \le p) $ vertices on $ C_p $, whereas $ \mathcal{V}_p^{2q} $ the subset of $ \mathcal{U}_p^{2q} $ with odd $p$ and its $q$ vertices of degree 4 being nonadjacent to each other. In this paper, we show that each graph in $ \mathcal{U}_p^{2q} $, $p$ even and its $q$ vertices of degree 4 being consecutive, is determined by its Laplacian spectrum. As well we show that if $G$ is a graph without isolated vertices and adjacency cospectral with the graph in $ \mathcal{V}_p^{p−1} = \{ H \} $, then $ G \cong H $.
Źródło:
Discussiones Mathematicae Graph Theory; 2017, 37, 3; 729-744
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the axiomatic theory of spectrum
Autorzy:
Kordula, V.
Müller, V.
Powiązania:
https://bibliotekanauki.pl/articles/1287568.pdf
Data publikacji:
1996
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
axiomatic theory of spectrum
local spectrum
semiregular operators
Opis:
There are a number of spectra studied in the literature which do not fit into the axiomatic theory of Żelazko. This paper is an attempt to give an axiomatic theory for these spectra, which, apart from the usual types of spectra, like one-sided, approximate point or essential spectra, include also the local spectra, the Browder spectrum and various versions of the Apostol spectrum (studied under various names, e.g. regular, semiregular or essentially semiregular).
Źródło:
Studia Mathematica; 1996, 119, 2; 109-128
0039-3223
Pojawia się w:
Studia Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł

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