Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

English (EN)·Polski (PL)·Yкраїнський (UK)
Przejdź do strony domowej biblioteki Centralna Biblioteka Wojskowa Link otwiera się w nowym oknie Logo biblioteki Prolib Integro - strona głównaCentralna Biblioteka Wojskowa

Wyszukujesz frazę "polarization" wg kryterium: Wszystkie pola

  Lista filtrów
Wyrównaj
Wyświetlanie 1-15 z 34
Tytuł:
Raman Polarization Pulling and Amplification for Polarization Division Multiplexing Transmission System
Autorzy:
Perlicki, K.
Powiązania:
https://bibliotekanauki.pl/articles/963829.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
fiber optics transmission
light polarization
polarization division multiplexing
Raman scattering
polarization pulling
Opis:
The numerical modelling of the Raman polarization attraction and amplification process in the telecommunication band around 1550 nm is presented. The possibility of achieving both polarization pulling and amplification in Polarization Division Multiplexing transmission system by exploiting the polarization dependence of stimulated Raman scattering is investigated. The acceptable crosstalk for the Polarization Division Multiplexing transmission systems was achieved for some attraction/amplification block parameters.
Źródło:
International Journal of Electronics and Telecommunications; 2011, 57, 4; 519-522
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design and Development of Biodegradable 3D Printed RDRA for Polarization Reconfigurability
Autorzy:
Apparao, Maganti
Karunakaran, Godi
Powiązania:
https://bibliotekanauki.pl/articles/2200726.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
polarization switching
circular polarization
linear polarization
dielectric resonator antennas
Opis:
In this article, a 3D printed rectangular dielectric resonator antenna which is capable of polarization reconfiguration has been designed. Dielectric resonator is composed of environment friendly and biodegradable material, which is Polylactic Acid. In the proposed model, the polarization can be switch from a linear to a circular by changing the state of a switch, electonically. The antenna switch between two different polarizations: Linear polarization during OFF STATE and Lefthand circular polarization during ON STATE. The proposed 3D printed dielectric resonator antenna is designed to operate in Cband of microwave spectrum, with a broad effective bandwidth (overlapped impedance bandwidths of both states) of 14.542% with centre frequency at 5.845GHz and peak gain 5.5dBi. Further, validated simulated results with experiment and both results are in good agreement.
Źródło:
International Journal of Electronics and Telecommunications; 2023, 69, 1; 69--74
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design of a Dual-Polarization Dual-Wideband Planar Antenna
Autorzy:
A'isya Nur Aulia Yusuf
Fitri Yuli Zulkifli
Powiązania:
https://bibliotekanauki.pl/articles/2055241.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
planar antenna
dual wideband
dual polarization
Opis:
Wireless communication is a fundamental requirement because of its low cost, high flexibility and convenience, continuing improvements in speed and connectivity, and accessibility in remote areas. One example is very small aperture terminal (VSAT) communication. A VSAT is a two-way satellite ground station operating at C-band and Ku-band frequencies, with linear and circular polarization in the C band and linear polarization in the Ku band. For the data transmitted by a satellite to be utilized by a user, the antenna on the user side must have dual-wideband and dual-polarization characteristics. In this study, a dual-polarization planar dual-wideband antenna with dimensions of 30 x 39 x 1.52 mm3 was designed using a dual-port approach. The introduction of a slot and perturbation on the patch side results in the dual-wideband characteristics of the antenna. The introduction of slots into the antenna ground results in circular polarization. The proposed antenna has resonant frequencies of 3 - 15 GHz on port 1 and 3.31 – 7.79 GHz and 9.05 – 15 GHz on port 2, with circular polarization characteristics on port 1 and linear polarization characteristics on port 2. On port 1, the gains at frequencies of 4.2 GHz is 3.93 dB, while on port 2, the gains at frequencies of 3.9 GHz is 0.51 dB.
Źródło:
International Journal of Electronics and Telecommunications; 2022, 68, 1; 41--46
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A novel method of elimination of light polarization cross sensitivity on tilted fiber Bragg grating bending sensor
Autorzy:
Harasim, Damian
Cięszczyk, Sławomir
Powiązania:
https://bibliotekanauki.pl/articles/2173905.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
tilted Bragg grating
optical fiber sensor
polarization
bending measurement
Opis:
The article shows the possibility of using TFBG gratings to measure the radius of curvature of fiber bending in conditions of variable polarization of the introduced light. Most of the modern, stable light sources generate light with a high degree of polarization. Due to the spatial asymmetry, the direction of the light polarization plane affects the spectral parameters of individual modes. For this reason, in the measurement systems using TFBGs presented so far it becomes necessary to determine and control the state of light polarization directly in front of the periodic structure. The article presents the determined spectral parameters of the cladding modes which allow bending measurements regardless of the direction of polarization of the introduced light. Thanks to this, the measuring system can be constructed without providing control of the introduced light polarization angle, which makes its construction simpler. When using TFBGs with an angle of 2°, the accuracy of determining the bending radius in the range from 15 mm to 30 mm when changing the angle of the plane of polarization in the full range is 0.318 mm in the case of changes in the transmission coefficient. For changes in the wavelength of the selected cladding mode, the accuracy is 0.3203 mm, with the input light polarization being changed in the range from 0° (P type) to 90° (S type).
Źródło:
Metrology and Measurement Systems; 2022, 29, 4; 737--749
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A design framework for rigorous constrained EM-driven optimization of miniaturized antennas with circular polarization
Autorzy:
Bekasiewicz, Adrian
Koziel, Slawomir
Powiązania:
https://bibliotekanauki.pl/articles/220503.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
axial ratio
antenna miniaturization
circular polarization antenna
constrained optimization
EM-driven design
Opis:
Compact radiators with circular polarization are important components of modern mobile communication systems. Their design is a challenging process which requires maintaining simultaneous control over several performance figures but also the structure size. In this work, a novel design framework for multi-stage constrained miniaturization of antennas with circular polarization is presented. The method involves sequential optimization of the radiator in respect of selected performance figures and, eventually, the size. Optimizations are performed with iteratively increased number of design constraints. Numerical efficiency of the method is ensured using a fast local-search algorithm embedded in a trust-region framework. The proposed design framework is demonstrated using a compact planar radiator with circular polarization. The optimized antenna is characterized by a small size of 271 mm2 with 37% and 47% bandwidths in respect of 10 dB return loss and 3 dB axial ratio, respectively. The structure is benchmarked against the state-of-the-art circular polarization antennas. Numerical results are confirmed by measurements of the fabricated antenna prototype.
Źródło:
Metrology and Measurement Systems; 2019, 26, 1; 41-52
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study Of Rust Preventive Characteristics Of Rust Preventive Oil From Polarization Curve Measurement
Badanie właściwości przeciwrdzewnych oleju z pomiaru krzywej polaryzacyjnej
Autorzy:
Iwashima, D.
Ejiri, K.
Nagase, N.
Hatekeyama, M.
Sunada, S.
Powiązania:
https://bibliotekanauki.pl/articles/353796.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
sintered steel
polarization curve
rust preventive oil
stal spiekana
krzywa polaryzacyjna
olej przeciwrdzewny
Opis:
Fe-Cu-C sintered steels are widely used as powder materials, because of its small volumetric shrinkage. However, Cu, which acts as cathode enhance formation of rust Fe2O3·xH2O during fabrication. To prevent formation of Fe2O3·xH2O rust preventive oils are widely used. High viscosity of those rust preventive oils decrease workability. While, low viscosity degrade rust preventive performance. Therefore, it is necessary to develop new rust preventive oils with contradictory properties of low viscosity and superior rust prevention. In this study, we developed technique to quantitatively evaluate rust prevention ability by measuring polarization curve through thin corrosive solution on Fe-Cu-C sintered steels coated with rust preventive oils. The electrochemical measurements were carried out in corrosive solution of 0.35 mass % NaCl. Using a double capillary was added dropwise to the specimen. From the experimental, it is possible to evaluate the corrosion rate quantitatively in the surface of specimen, which was coated with rust preventive oil through thin corrosive solution. From the measurement results, Corrosion rate is reduced by coating the rust preventive oil. Especially, corrosion rate of the specimen coated with oil that showed best performance indicated 10000 times better than that of without oil ones. Zn addition negative correlation between corrosion rate and period of potential oscillation.
Spiekane stale Fe-Cu-C są szeroko stosowane jako materiały proszkowe, ze względu na mały skurcz objętościowy. Jednak miedź, która zachowuje się jak katoda, wpływa na zwiększone powstawanie rdzy Fe2O3·xH2O w procesie wytwarzania stali. Aby zapobiec tworzeniu się Fe2O3·xH2O stosuje się oleje ochronne. Jednak wysoka lepkość olejów zmniejsza ich urabialność, natomiast niska lepkość zmniejsza ich właściwości ochronne. Z tych względów konieczne jest opracowanie nowego typu olejów przeciwrdzewnych charakteryzujących się zarówno niską lepkością jak i dobrymi właściwościami ochronnymi. W niniejszej pracy opracowano metodę ilościowej oceny właściwości ochronnych olejów za pomocą pomiaru krzywej polaryzacji poprzez cienką warstwę roztworu korozyjnego na spiekanych stalach Fe-Cu-C pokrytych olejami ochronnymi. Pomiary elektrochemiczne zostały przeprowadzone w roztworze korozyjnym NaCl (0,35 %wag.). Roztwór został naniesiony na próbkę za pomocą kapilary. Na podstawie wyników eksperymentalnych można ilościowo oszacować szybkość korozji zachodzącej na powierzchni próbki. Badania wykazały, że olej ochronny zmniejsza szybkość korozji. Olej dla którego otrzymano najlepsze wyniki wykazał poprawę właściwości ochronnych 10000 krotnie w porównaniu z próbkami bez oleju. Dodatkowo stwierdzono korelację pomiędzy szybkością korozji a okresem oscylacji potencjału.
Źródło:
Archives of Metallurgy and Materials; 2015, 60, 2A; 915-917
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cultural and Social Diversity as an Economic Resource
Autorzy:
Pyrkosz, Damian S.
Powiązania:
https://bibliotekanauki.pl/articles/1916356.pdf
Data publikacji:
2021-06-28
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
society
culture
ethnicity
economic development
resource
fractionalization
polarization
Opis:
The paper seeks to identify the role of cultural and social diversity in economic development. It starts by defining the terms that are critical to the analysis, including diversity, fractionalization, polarization, social diversity, cultural diversity and economic resources, as well as providing the most significant indexes thereof. The main body of the paper interprets the notions of cultural and social diversity in terms of being a valuable economic resource. Furthermore, it collects a vast body of literature to demonstrate the relationship between the cultural/social diversity and economic development with regard to adverse or positive impact on the latter. In regard to the negative impact of diversity, the paper identifies it in the area of social communication, social capital and networks, as it effectively causes a decrease in productivity and increase in social conflict and isolation. The positive link is demonstrated with examples in the areas of innovation, creativity, usage of complementary abilities and experiences, and their role in increasing productivity. The paper refers to numerous data sources, studies and indexes illustrating how the economic systems of various countries perform in the context of the paper’s subject-matter.
Źródło:
Kultura i Społeczeństwo; 2021, 65, 2; 141-155
2300-195X
Pojawia się w:
Kultura i Społeczeństwo
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of polarized signals on the performance of adaptive antenna arrays
Autorzy:
Al Ka'bi, Amin H.
Powiązania:
https://bibliotekanauki.pl/articles/949909.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
adaptive arrays
antennas
electromagnetics
mutual coupling
polarization
Opis:
The polarized electromagnetic waves have significant impact on the performance of adaptive antenna arrays. In this paper we investigate the effect of polarized desired and undesired signals on the performance of electronically steered beam adaptive antenna arrays. To achieve this goal, we built an analytical signal model for the adaptive array, in order to analyze, and compare the effect of polarized signals on the output SINRs (signal to interference plus noise ratios) of single-dipole, and cross-dipole adaptive antenna arrays. Based on a proof-of-concept experiment, and on MATLAB simulation results, it will be shown that cross-dipole adaptive antenna arrays exhibit better performance in comparison with single-dipole adaptive antenna arrays in presence of randomly polarized signals. However, single-dipole arrays show better performance under certain operating conditions.
Źródło:
Archives of Electrical Engineering; 2020, 69, 4; 857-872
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Influence of Fibre Bending on Polarization-Dependent Twist Sensor Based on Tilted Bragg Grating
Autorzy:
Harasim, D.
Powiązania:
https://bibliotekanauki.pl/articles/221279.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
optoelectronic sensors
tilted bragg grating
sensing technology
Opis:
This paper presents an experimental study on influence of input light polarization on the spectral characteristics of a fibre twist sensor based on Tilted Fiber Bragg Grating (TFBG) with simultaneous application of bending to an optical fibre. The application of proposed measurement stand could provide the ability of transforming the bending to a displacement. The twist measurement was performed by tuning of the sensor illuminating light polarization angle. The spectral parameters of selected cladding mode which are sensitive to the rotation of input light polarization angle have been shown. This paper shows the characteristics of transmittivity and wavelength shift for an incident high-order cladding mode measured with different curvatures of fibre. The dependency of selected cladding mode spectral parameters related with the twist measurement on the influence of temporary bending has been shown. The measurements were performed for two positions of sensing structure refractive index perturbations in relation to the bending direction plane. The experimental results show that the direction of TFBG structure bending has a small influence on the stability of spectral parameters characteristic for twist measurement, assuming that the bending direction is fixed while measurement.
Źródło:
Metrology and Measurement Systems; 2017, 24, 3; 577-584
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Corrosion Damage Mechanisms of TiO2 Cold-Sprayed Coatings
Autorzy:
Lachowicz, Marzena
Winnicki, Marcin
Powiązania:
https://bibliotekanauki.pl/articles/2125544.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
titanium dioxide
cold-sprayed coatings
potentiodynamic polarization test
aluminum alloys
structural steel
Opis:
Cold spraying as a low-temperature coating deposition method is intended for thermally sensitive materials. Due to its precise temperature control, it limits the formation of structural defects, and can therefore be easily applied to spray corrosion protective coatings made from metal or metal-ceramic powders. However, the formation of pure ceramic coatings with the use of cold spraying is still not so common. Titanium dioxide is one of the most interesting ceramics due to its photocatalytic properties. Nevertheless, these types of coating materials usually work in a corrosion favoring humid atmosphere. In the presented paper, amorphous TiO2 powder was deposited onto aluminum alloys and steel substrates and then submitted to potentiodynamic corrosion tests in a 3.5 wt.% NaCl solution. The as-sprayed coating showed phase transition from amorphous TiO2 to anatase, and also revealed porosity. As a result, electrolytes penetrated the coating and caused undercoating corrosion in the tested environment of an aqueous NaCl solution. The analysis of the potentiodynamic curves showed that the presence of the coating decreased corrosion potential on both substrates. It arose from the mixed phases of TiO2, which consisted of photocathode - amorphous material and photoanode - crystalline anatase. The phase mixture induced the galvanic corrosion of metallic substrates in the presence of electrolytes. Moreover, pitting-like corrosion and coating delamination were detected in aluminium alloy and steel samples, respectively. Finally, the corrosion mechanism of the titanium dioxide coatings was characterized and described.
Źródło:
Archives of Metallurgy and Materials; 2022, 67, 3; 975--985
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Polarity and patterning in plants development
Autorzy:
Friml, J.
Powiązania:
https://bibliotekanauki.pl/articles/80096.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
conference
polarity
cell polarization
signalling molecule
auxin transport
patterning
plant development
embryogenesis
organogenesis
vascular tissue
tropism
environmental signal
Źródło:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2013, 94, 3
0860-7796
Pojawia się w:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Conception of Magnetic Memory Switched by Time Dependant Current Density and Current Electron Spin Polarization
Autorzy:
Steblinski, Paul
Blachowicz, Tomasz
Powiązania:
https://bibliotekanauki.pl/articles/227198.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
spintronics
magnetic logic
BPM memories
magnetic simulations
Opis:
In this article the magnetic memory model with nano-meter size made from iron cells was proposed. For a purpose of determining the model specifications, the magnetic probes group with different geometrical parameters were examined using numeric simulations for the two different time duration of transitions among quasi-stable magnetic distributions found in the system, derived from the energy minimums. The geometrical parameters range was found, for which the 16 quasi–stable energetic states exist for the each probe. Having considered these results the 4 bits magnetic cells systems can be designed whose state is changed by spin-polarized current. Time dependent current densities and the current electron spin polarization directions were determined for all cases of transitions among quasi-stable states, for discovered set of 4 bits cells with different geometrical parameters. The 16-states cells, with the least geometrical area, achieved the 300 times bigger writing density in comparison to actual semiconductor solutions with the largest writing densities. The transitions among quasi-stable states of cells were examined for the time durations 10⁵ times shorter than that for up to date solutions.
Źródło:
International Journal of Electronics and Telecommunications; 2019, 65, 2; 309-312
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimal Method for Polarization Selection of Stationary Objects Against the Background of the Earth’s Surface
Autorzy:
Volosyuk, Valerii
Zhyla, Simeon
Pavlikov, Vladimir
Ruzhentsev, Nikolay
Tserne, Eduard
Popov, Anatoliy
Shmatko, Oleksandr
Dergachov, Kostiantyn
Havrylenko, Olena
Ostroumov, Ivan
Kuzmenko, Nataliia
Sushchenko, Olga
Averyanova, Yuliya
Zaliskyi, Maksym
Solomentsev, Oleksandr
Kuznetsov, Borys
Nikitina, Tatyana
Powiązania:
https://bibliotekanauki.pl/articles/2055248.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
polarimetric radar
polarization selection
power lines detection
multichannel processing
maximum likelihood method
Opis:
Within the maximum likelihood method an optimal algorithm for polarization target selection against the background of interfering signal reflected from the earth’s surface is synthesized. The algorithm contains joint operations of spectral interference rejection and their polarization compensation by means of certain combinations of interchannel subtraction of signals of different polarizations. The physical features of the elements of the polarization scattering matrix are investigated for the technical implementation of the synthesized algorithm.
Źródło:
International Journal of Electronics and Telecommunications; 2022, 68, 1; 83--89
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The gyrotron for DNP-NMR spectroscopy: A review
Autorzy:
Nowak, Kacper
Powiązania:
https://bibliotekanauki.pl/articles/2173563.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
DNP-NMR spectroscopy
gyrotron stability
gyrotron tuning
dynamic nuclear polarization
spektroskopia magnetycznego rezonansu jądrowego
stabilność żyrotronu
strojenie żyrotronu
Opis:
This paper outlines the principle of the DNP-NMR technique. The gyrotron, as a very promising microwave source for NMR spectroscopy, is evaluated. Four factors: power stability, power tuning, frequency stability, and frequency tuning determine the usability of the gyrotron device. The causes of instabilities, as well as the methods of overcoming limitations and extending usability are explained with reference to the theory, the numerical and experimental results reported by gyrotron groups.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2022, 70, 1; e140354, 1--13
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Polaryzacja zagadnień edukacyjnych na Mazowszu wyzwaniem w rozwoju obszarów wiejskich
Polarization on Issues Related to Education on Mazovia as a Challenge in Rural Development
Autorzy:
Czapiewski, Konrad Ł.
Janc, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/2029033.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Źródło:
Studia komitetu przestrzennego zagospodarowania kraju PAN; 2014, 156; 335-357
0079-3507
Pojawia się w:
Studia komitetu przestrzennego zagospodarowania kraju PAN
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 34

Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies