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Wyświetlanie 1-15 z 22
Tytuł:
Plasmonic nano-imaging with metallic nanolens
Autorzy:
Ono, A.
Verma, P.
Kawata, S.
Powiązania:
https://bibliotekanauki.pl/articles/385208.pdf
Data publikacji:
2009
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
plasmonics
near-field optics
Opis:
We proposed a nano-imaging system at optical frequency region with the array of metallic nanorods. We simulated the field distribution of imaging process using the finitedifference time-domain algorithm. It is found that the spatial resolution is 40 nm, which is much beyond the diffraction-limit and is limited by the array pitch. The typical configuration is a hexagonal arrangement with 40 nm periodicity of silver rods of 50 nm height and 20 nm diameter. The image formation highly depends on the coherence and the polarization of the dipole sources, the array pitch, and the source-array distance. The principle of our near-field imaging is based on the longitudinal resonance of the localized surface plasmon along a metallic nanorod. The spectral responses of the device are also investigated.
Źródło:
Journal of Automation Mobile Robotics and Intelligent Systems; 2009, 3, 4; 102-104
1897-8649
2080-2145
Pojawia się w:
Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of surface plasmon wave interference on near-field imaging on metal nanostructures with apertured probe
Autorzy:
Yang, Y.
Sun, Z.
Powiązania:
https://bibliotekanauki.pl/articles/173847.pdf
Data publikacji:
2013
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
near-field
surface plasmon
metal
nanostructure
Opis:
We numerically studied artifact issues on near-field imaging of field intensity on metal nanostruc-tures (isolated ridges and slits in a continuous film) with an apertured probe. It is shown for the latter case that the interaction between neighboring slits via propagating surface plasmon waves (e.g., surface plasmon wave interferences) makes the probe-imaged field intensity highly condi-tional in reflection of the unperturbed field. As surface plasmon behaviors and probe imaging processes are polarization-sensitive and the field components are correlated, a model analysis of the partial field components elucidates their relations, which can help to derive the unperturbed near-field image from the probed one.
Źródło:
Optica Applicata; 2013, 43, 3; 615-626
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The identification method of the sources of radiated electromagnetic disturbances on the basis of measurements in the near-field zone
Autorzy:
Trzcinka, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/2141812.pdf
Data publikacji:
2021
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
electromagnetic compatibility
EMC
near electromagnetic field
radiated emission
near-field probe
source of disturbance
Opis:
The paper presents results of tests of a simple device, consisting in the location of a source of disturbance emission by means of measurements within the near field with manual positioning of the measuring probe. The effectiveness of the source of disturbance location was finally verified by a positive result of the radiated emission tests in the EMC laboratory using a standardised method.
Źródło:
Journal of Automation Mobile Robotics and Intelligent Systems; 2021, 15, 4; 53-64
1897-8649
2080-2145
Pojawia się w:
Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical simulations of blast loads from near-field ground explosions in ai
Autorzy:
Dobrociński, S.
Flis, L.
Powiązania:
https://bibliotekanauki.pl/articles/178782.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
near-field
blast load
numerical simulation
high explosive
Opis:
Numerical simulations of air blast loading in the near-field acting on the ground have been performed. A simplified blast model based on empirical blast loading data representing spherical and hemispherical explosive shapes has been simulated. Conwep is an implementation of the empirical blast models presented by Kingery and Bulmash, which is also implemented in the commercial code LS-DYNA based on work done by Rahnders-Pehrson and Bannister. This makes it possible to simulate blast loads acting on structures representing spherical and hemispherical explosive shapes of TNT with reasonable computational effort as an alternative to the SPH and Eulerian model. The CPU time for the simplified blast model is however considerably shorter and may still be useful in time consuming concept studies. Reasonable numerical results using reasonable model sizes can be achieved not only for modelling near-field explosions in air but most areas of geotechnical. Calculation was compared with blast SPH and Eulerian model.
Źródło:
Studia Geotechnica et Mechanica; 2015, 37, 4; 11-17
0137-6365
2083-831X
Pojawia się w:
Studia Geotechnica et Mechanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
X-band coaxial monopole antenna with an additional metal screen
Autorzy:
Khruslov, M.
Pazynin, V.
Powiązania:
https://bibliotekanauki.pl/articles/307620.pdf
Data publikacji:
2007
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
monopole antenna
near field
radiation pattern
FDTD technique
Opis:
The novel coaxial monopole antenna design with an additional metal screen is presented. The radiation char- acteristics of this antenna are investigated depending on a dis- tance between the ground plane and additional metal screens, as well as on a size of the latter. Measured and calculated ra- diation patterns are compared within limits of the operative frequency band and their revealed distinctions are discussed. The antennas characteristics allow pronounce that it can be considered as a promising candidate for various practical ap- plications both a single radiator and a composite element of antenna arrays.
Źródło:
Journal of Telecommunications and Information Technology; 2007, 1; 30-34
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Channel Characterisation and Link Budget of MIMO Configuration in Near Field Magnetic Communication
Autorzy:
Nguyen, H.
Agbinya, J. I.
Devlin, J.
Powiązania:
https://bibliotekanauki.pl/articles/226972.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
near field magnetic induction communication
NFMIC
MIMO inductive communication
Opis:
Traditional radio communication has gained significantly from using multiple input and multiple output (MIMO) architecture in the system. Many wireless applications, such as wireless LAN and cellular network, have adopted this technology to improve their system performance. However, the effect of MIMO systems has not been investigated in the case of inductive near field short range communications. The purpose of this paper is to explore a new method for increasing the magnetic communication range using MIMO. Three system models includingMISO, SIMO and MIMO are proposed to characterize the number of transmitters and receivers to the link. These models have helped to extend not only the range but also the communication channel in NFMIC.
Źródło:
International Journal of Electronics and Telecommunications; 2013, 59, 3; 255-262
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Correction of Evanescent Wave Influence on the Flexural Wave Velocity and Wavelength Estimation Based on a Mode Shape Function
Autorzy:
Pantelić, Filip
Šumarac Pavlović, Dragana
Mijić, Miomir
Ridley-Ellis, Daniel
Powiązania:
https://bibliotekanauki.pl/articles/31339954.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
mode shape function
flexural wave velocity
very near field
Opis:
The aim of this research is to use a simple acoustic method of a very near field recording, which enables measurement and display of oscillation modes, to estimate the velocity of flexural waves, based on the wavelengths of standing waves measured on the sample. The paper analyses cases of 1D geometry, flexural waves that occur on a beam excited by an impulse. Measurements were conducted on two different samples: steel and a wooden beam of the same length. Due to the appearance of evanescent waves at the boundary regions, the distance between the nodes of standing waves that occur deviates from half the wavelength, which can be compensated using a correction factor. Cases of fixed and free boundary conditions were analysed. By quantifying how much the boundary conditions change the mode shape function, it can be predicted how the mode of oscillation changes if the boundary conditions change, which can also find application in musical acoustics and sound radiation analysis.
Źródło:
Archives of Acoustics; 2022, 47, 4; 539-546
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A simple model of the scanning near-field optical microscopy probe tip for electric field enhancement
Autorzy:
Wang, Y.
Cai, W.
Yang, M.
Liu, Z.
Shang, G.
Powiązania:
https://bibliotekanauki.pl/articles/174091.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
near-field tip
electromagnetic field enhancement
finite-difference time-domain
FDTD
Opis:
In this paper, we present a simple near-field probe model that is composed of an elongated ellipsoid and a finite metal truncated cone. The elongated ellipsoid has been shown to act as a protrusion or separate particle near a truncated cone apex with strong near-field enhancement under laser excitation. By controllably varying the length of the ellipsoid protrusion from the truncated cone, the truncated cone-ellipsoid probes can be adapted to the suitability of near-field probes. The effects of substrate material and excitation wavelength on the near field enhancement for different tip apexes are also discussed. In addition, we compared the properties of the truncated cone-ellipsoid probe with the widely used hemisphere conical tip by launching surface plasmon polaritons on plasmonic waveguides to prove the suitability of the truncated cone-ellipsoid probes as high performance near-field probes. The present simple model would provide a theoretical basis for the actual construction of probes.
Źródło:
Optica Applicata; 2017, 47, 1; 119-130
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design of Acoustic Tubes Array and Application to Measuring Acoustic Loads in Supersonic Airflow
Autorzy:
Wei, L.
Li, M.
Fu, Q.
Fan, Y.
Yang, D.
Powiązania:
https://bibliotekanauki.pl/articles/176750.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
acoustic load
acoustic tubes array
near field measurement
supersonic airflow
Opis:
In the acoustic fatigue experiment for hypersonic vehicle in simulated harsh service environment on ground, acoustic loads on the surface of test pieces of the vehicle need to be measured. However, for the normal microphones without high temperature resistance ability, the near field sound measurement cannot be achieved. In this work, on the basis of previous researches, an acoustic tubes array is designed to achieve the near field measurement of acoustic loads on the surface of the test piece in the supersonic airflow with high temperature achieved by coherent jet oxygen lance. Firstly, the process of designing this acoustic tubes array is introduced. Secondly, the equality of phase differences at the front and at the end of the tubes is stated and proved using a phase differences test with an acoustic tubes array whose design is presented in this text; therefore, the phase differences of signals acquired by microphones can be directly applied to beamforming algorithm to determine the acoustic load source. Finally, using above mentioned acoustic tubes array, measurement of acoustic load, with and without a test piece in the supersonic airflow made by the coherent jet oxygen lance, is conducted respectively, and the measurements results are analyzed.
Źródło:
Archives of Acoustics; 2014, 39, 3; 395-402
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Far and near fields of Hermite–Gaussian beams passing through an annular aperture and its numerical simulation by the angular spectrum method
Autorzy:
Talatinian, Alexander
Powiązania:
https://bibliotekanauki.pl/articles/27310101.pdf
Data publikacji:
2023
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
angular spectrum
propagation of higher modes
annular aperture
near field
far field
Opis:
This research focuses on the analysis of the free propagation of Hermite–Gaussian beams diffracted by a symmetrical annular aperture placed at the beam waist plane. The propagation is studied analytically and numerically using the angular spectrum method and the 2D fast Fourier transformation. Numerical simulation examples illustrate the propagation characteristics of the Hermite–Gaussian beams diffracted by an annular aperture. The beam truncation parameters and obscuration ratio influence Hermite–Gaussian beam diffraction properties.
Źródło:
Optica Applicata; 2023, 53, 3; 467--481
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reconfigurable Antenna Arrays with Phase-only Control in the Presence of Near-field Nulls
Autorzy:
Buttazzoni, G.
Vescovo, R.
Powiązania:
https://bibliotekanauki.pl/articles/308578.pdf
Data publikacji:
2017
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
antenna arrays
near-field nulls
phase-only control
power synthesis
reconfigurability
Opis:
In this paper an effective iterative method is presented for the power synthesis of reconfigurable antenna arrays. The algorithm is suitable for arrays of arbitrary geometry, including the case where a large number of elements is involved. The reconfigurability is achieved by phase-only control, so that the excitation amplitude of each array element remains constant during the reconfiguration process. Such amplitudes may be different from one array element to the others, and they are not assigned a priori, but are optimized. Furthermore, the electric field is imposed to vanish in a number of prescribed points of the near-field region, so that a strong field reduction is obtained in a neighborhood of them.
Źródło:
Journal of Telecommunications and Information Technology; 2017, 3; 88-93
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluating main parameters effects of near-field earthquakes on the behavior of concrete structures with moment frame system
Autorzy:
Jouneghani, K. T.
Hosseini, M.
Rohanimanesh, M. S.
Dehkordi, M. R.
Powiązania:
https://bibliotekanauki.pl/articles/957883.pdf
Data publikacji:
2017
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
near-field earthquakes
moment frames
affect
behavior
accelerogram
structural mechanism spectrum
Opis:
Amplitude and frequency content are two important features of earthquakes that are different for near and far-fault earthquakes and in most of the standards, the effects of near-field earthquakes in loading are not considered. Therefore, study and comparison of these effects on structures is necessary. In this paper, structural operation against near and far fault earthquakes for two near sites and two far sites is investigated. For this purpose and in order to achieve an operation point of a structural model with six staircases with a mean lateral bending frame resistant system seismic hazard information is analyzed with regards to special plan spectrums of 2 different sites using near and far faults. An evaluation of the effects due to near and far fault earthquakes based on the Iran’s standard 2800 ranges on operation point and the comparison of operation effects of near and far fault spectrums with Iran’s standard are results of this research work. After the presentation of results obtained from time history analyses, some suggestions are proposed for design correction based on the regulations in near -field earthquakes. Keywords: Near-field earthquakes, moment frames, affect, behavior, Accelerogram compatibility with structural mechanism spectrum.
Źródło:
Advances in Science and Technology. Research Journal; 2017, 11, 3; 10-23
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of radionuclide release through EBS of conceptual repository for Lithuanian RBMK spent nuclear fuel disposal : case of canister with initial defect
Autorzy:
Poskas, P.
Narkuniene, A.
Grigaliuniene, D.
Kilda, R.
Powiązania:
https://bibliotekanauki.pl/articles/147504.pdf
Data publikacji:
2013
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
geological repository
near field
radionuclide release
radiotoxicity
RBMK reactor
spent nuclear fuel
Opis:
This paper presents research on radionuclide transport from generic geological repository for the RBMK-1500 SNF of 2.8 235U initial enrichment (with Er absorber) and average burn-up of ~ 29 MWd/kgU. Radionuclide transport analysis was focused on the engineered barrier system (EBS) and performed taking into account possible differences in the data on the initial size of a canister defect, defect enlargement time and radionuclide release start time. For the numerical simulations, computer code AMBER (UK) was used. The analysis of radionuclide transport regularities demonstrates that the release from the EBS is the most intensive after the defect enlargement. Most relevant radionuclides were identified based on the mass transfer analysis complemented by the analysis of radiotoxicity flux. The results showed that, depending on the differences of the initial defect size, defect enlargement time and release start time, the peak flux from the EBS may vary by a factor of 2 (for 129I) and 1.5 (for 226Ra) for RBMK-1500 SNF.
Źródło:
Nukleonika; 2013, 58, 4; 487-495
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of NFC technology in passenger rail transport
Wykorzystanie technologii NFC w pasażerskim transporcie kolejowym
Autorzy:
Komsta, H.
Brumercikova, E.
Bukova, B.
Powiązania:
https://bibliotekanauki.pl/articles/374906.pdf
Data publikacji:
2016
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
passenger rail transport
Near Field Communication technology
pasażerski transport kolejowy
technologia NFC
Opis:
The article discusses the possibility of the application of the NFC technology as a system of selling tickets in passenger rail transport. The NFC (Near Field Communication) technology is a wireless and contactless technology of transmission of radio data over short distances (max. 5 cm). This technology is very similar to the RFID (Radio Frequency Identification) technology. It is assumed that this technology will spread rapidly and that already in 2015 around 85% of the payments in the EU will be made via mobile phones. This paper presents a research of passenger interest in this method of payment for tickets in the passenger rail transport in Slovakia. Further, an analysis of the applications of the NFC technology as a system of selling tickets in passenger rail transport, including the protection of data in mobile phones, the processes in case of losing a mobile phone and ensuring the communication between both parties was presented in the article. The last part of this analysis shows the possibility of purchasing tickets regardless of the carrier and the transport type.
W artykule opisano możliwe zastosowania technologii NFC jako systemu sprzedaży biletów w pasażerskim transporcie kolejowym. Technologia NFC (Near Field Communication) jest bezprzewodową i bezdotykową metodą transmisji danych na krótkie odległości (max. 5 cm). Jest ona bardzo podobna do technologii RFID (Radio Frequency Identification). Zakłada się, że będzie się ona szybko rozwijała i już w 2015 roku 85% płatności dokonywanych na terenie Unii Europejskiej nastąpi za pośrednictwem telefonów mobilnych. W artykule przedstawiono badania oceniające zainteresowanie pasażerów tą metodą zakupu biletów kolejowych na Słowacji. Przedstawiono w nim także planowane zastosowania technologii NFC jako systemu sprzedaży biletów w pasażerskim transporcie kolejowym, z uwzględnieniem ochrony danych w telefonach komórkowych, czynności w przypadku utraty telefonu komórkowego i zapewnieniem komunikacji pomiędzy elementami systemu. Przeanalizowano w nim także możliwość zakupu biletów niezależnie od przewoźnika oraz rodzaju transportu.
Źródło:
Transport Problems; 2016, 11, 3; 43-53
1896-0596
2300-861X
Pojawia się w:
Transport Problems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Absorption of EM energy by human body in the vicinity of the GSM base station antenna
Autorzy:
Wójcik, D.
Topa, T.
Szczepański, K.
Powiązania:
https://bibliotekanauki.pl/articles/307771.pdf
Data publikacji:
2005
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
cellular telephony
GSM
human exposure to EM fields
antennas
near field
specific absorption rate
Opis:
A hybrid method is proposed for specific absorption rate analysis in a human body located in the near field of typical GSM base-station panel antenna. The method combines FDTD technique with analytical description of the near field of isolated antenna. The approximate results are found to be in excellent agreement with the results obtained by using the traditional FDTD. The most important advantage of proposed approach is minimization of computer memory requirements and computation time.
Źródło:
Journal of Telecommunications and Information Technology; 2005, 2; 34-38
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 22

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