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    Wyświetlanie 1-25 z 25
    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:
    Ekspozycja zawodowa na impulsowe pola elektromagnetyczne wytwarzane przez urządzenia techniki wojskowej
    Occupational exposure to pulsed electromagnetic fields generated by military equipment
    Autorzy:
    Kieliszek, J.
    Sobiech, J.
    Stankiewicz, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/180458.pdf
    Data publikacji:
    2013
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    pole elektromagnetyczne
    pole bliskie
    ekspozycja
    urządzenia radiolokacyjne
    electromagnetic fields
    near field
    exposure
    radar
    Opis:
    Eksploatacja urządzeń techniki wojskowej wiąże się w znacznym zakresie z koniecznością przebywania w polu elektromagnetycznym o wartościach stref ochronnych bezpieczeństwa i higieny pracy, ustanowionych w przepisach krajowych. Wartości natężeń pola elektromagnetycznego na stanowiskach pracowników, obsługujących te urządzenia, często przewyższają wartości występujące przy urządzeniach stosowanych w innych działach gospodarki. Polskie Normy tylko częściowo uwzględniają specyfikę urządzeń wojskowych. Ich bezpośrednie zastosowanie prowadzi w wielu wypadkach do niedoszacowania narażenia na pole elektromagnetyczne strefy bliskiej anten radarów. W pracy przedstawiono analizę wielkości natężeń pola elektrycznego występującego wokół urządzeń wytwarzających silne pola modulowane impulsowo. Na podstawie uzyskanych wyników badań dokonano analizy ekspozycji personelu obsługującego te urządzenia na stałych i zmiennych stanowiskach pracowników. Przeprowadzona ocena wskazuje stanowiska i obszary wokół urządzeń techniki wojskowej, które powinny podlegać szczególnej ochronie ze względu na zwiększone narażenie personelu.
    Operating military technology is highly related to necessary exposure to electromagnetic fields, whose values are specified in national regulations on protection zones of occupational safety and health. Values of strength of electromagnetic fields in locations of people operating such devices often exceed values near devices in other areas of the economy. Polish standards only partially take into account the specificity of military equipment. The direct use of such devices in many cases leads to an underestimation of exposure to electromagnetic fields in the near field of radar antennas. This paper presents an analysis of the strength of electromagnetic fields near devices generating strong pulse modulated fields. Based on the measurement results, exposure of personnel operating devices at fixed and variable workstations was analysed. The evaluation indicates workstations and areas around military equipment that should be especially protected due to anincreased exposure of personnel.
    Źródło:
    Bezpieczeństwo Pracy : nauka i praktyka; 2013, 9; 22-24
    0137-7043
    Pojawia się w:
    Bezpieczeństwo Pracy : nauka i praktyka
    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
    Tytuł:
    Evolution of the diffraction pattern during the transition from the near-field toward the far-field region
    Autorzy:
    Grabka, M.
    Pustelny, S.
    Wajnchold, B.
    Gawlik, W.
    Mergo, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/200137.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    wave optics
    diffraction of light
    near-field diffraction
    microstructured optical fibres
    photonic crystal fibers
    Opis:
    In the paper we experimentally and theoretically analyze diffraction of light propagating through a microstructured optical fiber on the fiber end face. In the measurements the diffracting light is spatially inhomogeneous and the diffracting object is a solid-state core with a triangular shape. Application of optical system enables detailed experimental investigations of evolution diffraction pattern in the near-field region, in particular, rotation of the observed structure while departing from the fiber end. The experimental results are confirmed with theoretical simulations based on the theory of the Fresnel diffraction.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2011, 59, 4; 389-393
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Review of mobile banking solutions including the analysis of survey performed among the individual users
    Przegląd rozwiązań bankowości mobilnej na tle badań ankietowych przeprowadzonych wśród użytkowników indywidualnych
    Autorzy:
    Panas, Jolanta
    Wilczyńska, Katarzyna
    Powiązania:
    https://bibliotekanauki.pl/articles/408688.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
    Tematy:
    online banking
    mobile application
    near field communication
    bankowość online
    aplikacja mobilna
    komunikacja bliskiego zasięgu
    Opis:
    The article presents the structure of the electronic banking with attention being given to solutions applied in mobile banking and mobile payments available in Poland. For the purpose of this article a survey was conducted among the active users of the Internet, aiming to research changes with regards to susceptibility of individual users to take advantage of application of mobile banking including mobile payments and their main concerns regarding the using of mobile banking services.
    Artykuł przedstawia strukturę bankowości elektronicznej z uwzględnieniem rozwiązań stosowanych w bankowości mobilnej oraz płatnościach mobilnych dostępnych w Polsce. Na potrzeby niniejszego artykułu przeprowadzono ankietę pośród użytkowników sieci Internet mającą na celu zbadanie zmian zachodzących w zakresie skłonności indywidualnych użytkowników do korzystania z usług bankowości mobilnej, w tym z płatności mobilnych oraz ich głównych obaw związanych z korzystaniem z usług bankowości mobilnej.
    Źródło:
    Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska; 2019, 9, 1; 12-22
    2083-0157
    2391-6761
    Pojawia się w:
    Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Protection System Against Products Counterfeit Based on NFC and Barcode Technologies
    Autorzy:
    SALEH, HADI M.
    UMARU, MOHAMMED U.
    ALEXANDROV, DMITRY V.
    Powiązania:
    https://bibliotekanauki.pl/articles/457118.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Rzeszowski
    Tematy:
    Anti-Counterfeit Products
    NFC Tags
    Barcodes
    QR
    Mobile Application
    Authenti-cation
    Near Field Communication (NFC)
    Opis:
    Abstract The objective of this report is to provide a protective system architecture and analysis for NFC and Barcode technology that can be use to empower consumer in the fight against counter-feiting and IPR infringing products using mobile devices. This report focuses on the technology that can empower the consumer in the field in the presence of the goods itself by using technical tools and devices, which are easily available. The report identifies the main immediate empower-ring tool for consumers. This is represented by a modern smartphone (or similar device like a tablet) to be use as a tool to empower the consumer in the fight against counterfeiting. The modern smartphone is equipped with a high resolution camera, support for different standards for wireless connectivity, a powerful processor able to support the implementation of sophisticated algorithms and support for NFC and Barcode readers. In addition, the smartphone can be integrated and aug-mented with a wide range of plug-in devices and tools (e.g., an USB microscope). The concept of empowering the consumer can be an important element to support Due Diligence practices and Supply Chain Integrity because the different categories of consumer can authenticate the goods in different parts of the supply chain and report the presence of non-compliances (e.g., counterfeit products).
    Źródło:
    Edukacja-Technika-Informatyka; 2017, 8, 4; 368-374
    2080-9069
    Pojawia się w:
    Edukacja-Technika-Informatyka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    EM emission of ICs implementated in FPGA : influence of floor plan and electric function
    Autorzy:
    Szczęsny, J.
    Kołodziejski, J. F.
    Powiązania:
    https://bibliotekanauki.pl/articles/378429.pdf
    Data publikacji:
    2007
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Technologii Elektronowej
    Tematy:
    FPGA
    emisja elektromagnetyczna
    prąd wysokiej częstotliwości
    Xilinx
    electromagnetic emission
    high frequency current
    near-field disturbances
    Opis:
    In the paper some investigations are presented aiming to check the influence of IC floor plan and the circuit function on its electromagnetic emissions. As the test vehicle Xilinx FPGA XCV800 type was used, in which two types of multiplicators were implemented. To compare the effects, high frequency currents in supply and ground pins of the circuits as well as near field disturbances were measured over the circuits.
    Źródło:
    Electron Technology : Internet Journal; 2007, 39, 4; 1-7
    1897-2381
    Pojawia się w:
    Electron Technology : Internet Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An Automated Lifeboat Manifesting Embarkation System (ALMES): optimizing evacuation and passenger manifestation Via RFID/NFC
    Autorzy:
    Andreadakis, A.
    Sloane, T. F.
    Dalaklis, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1841546.pdf
    Data publikacji:
    2021
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    Automated Lifeboat Manifesting Embarkation System
    Near-Field Communication
    Radio Frequency and Identification
    Vessel Data Recorder
    Maritime Rescue Coordination Centre
    Life Saving Appliances
    Lifeboat
    Opis:
    Today, a significant number of quite advanced technology applications support safety at sea. To the dismay of the maritime industry, the manifestation of passengers during an evacuation scenario/case has not followed a similar path of improvement, when compared to the counterpart Life Saving Appliances (LSA) Code. Embarkation and muster proceedings are still following the similar approaches that were established during the early 1900s. There have been relatively few advances in these procedures; most often, they include manually checking-in the passengers on electronic systems, along with “on the spot” completion of check-off lists and passenger counts, allowing for an influx of potential error by the concerned personnel. Furthermore, the rely and transmission of the manifest to a Maritime Rescue Coordination Centre (MRCC) is often associated with a considerable amount of time, or even involving secondary passenger counts, after the disembarkation event has been concluded. It is understandable that a vessel with limited people on-board (tankers, bulk carriers, container vessels, etc.) can effectively be abandoned in a matter of minutes, but what happens with vessels carrying a large number of passengers and more specifically those heavily engaged with cruising activities? This paper examines the creation of an electronic manifestation system that will be able to automatically record the passengers during lifeboat embarkation. This proposed system will employ the use of Near-Field Communication (NFC) and/or (Radio-frequency identification) RFID bracelets, that are already utilized within the cruise industry. It will record relevant passenger and crew data, upon their boarding on the designated lifeboat, through readers installed on the parallel sides of the entryway. The data will be displayed in electronic tablet devices to the lifeboat leaders, as well as to the Master of the vessel in real-time. This will allow for an accurate representation of the evacuation process in any given moment. Furthermore, a complete “snapshot” of that information can also be directly transmitted to the MRCC via an automated message and without any further human intervention, or even stored locally aboard the lifeboats used for the evacuation and the ship’s Vessel Data Recorder (VDR).
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2021, 15, 1; 215-222
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Innowacje w kartach walutowych i mobilnych płatnościach zbliżeniowych
    Innovations in currency cards and contactless mobile payments
    Autorzy:
    Jagodzińska-Komar, Ewa
    Powiązania:
    https://bibliotekanauki.pl/articles/446705.pdf
    Data publikacji:
    2016
    Wydawca:
    Mazowiecka Uczelnia Publiczna w Płocku
    Tematy:
    multicurrency cards
    NFC (Near Field Communications)
    HCE (Host Card Emulation)
    contactless mobile payment
    BLIK system
    karta wielowalutowa
    NFC (komunikacja bliskiego zasięgu)
    HCE („NFC w chmurze”)
    mobilne płatności zbliżeniowe
    system BLIK
    Opis:
    The aim of the article is to present new innovations in electronic banking. In the article the author described many benefits of multicurrency cards, which is unique solution for persons who travel a lot and make payment transactions in different currencies. It was described the role of contactless mobile payments in development of non-cash transactions. Host Card Emulation (HCE) is mobile technology which is making a strong move to be the dominant in mobile payments. Host Card Emulation has enabled banks, merchants, and others participants to bypass the secure element on Android phones in order to access the Near Field Communications chip on smartphones. In the article the author also underlined the role of BLIK system on Polish Market. This system enables customers to generate of check and make money transfers on Android phone number. One -time code is generated for each transaction and this provide high level safety of making contactless mobile payments
    Celem artykułu jest przedstawienie innowacji w elektronicznych instrumentach płatniczych. Na początku zwrócono uwagę na korzyści karty wielowalutowej, która jest unikalnym rozwiązaniem dla osób dużo podróżujących i przeprowadzających transakcje płatnicze w różnych walutach. Podkreślono ważną rolę mobilnych płatności zbliżeniowych w rozwoju bezgotówkowych transakcji. Szczególnie zwrócono uwagę na płatności mobilne w technologii HCE, które umożliwiają szybkie i bezpieczne przeprowadzanie transakcji przy użyciu telefonu komórkowego. Opisano nowe rozwiązanie płatności mobilnych, które pojawiło się na rynku polskim czyli system BLIK. Unikalną cechą sytemu Polskiego Standardu Płatności jest możliwość generowania czeków oraz dokonywania przelewów na numer telefonu komórkowego. Dla każdej transakcji generowany jest jednorazowy kod i to wpływa na zwiększenie bezpieczeństwa przeprowadzanych transakcji.
    Źródło:
    Zeszyty Naukowe PWSZ w Płocku. Nauki Ekonomiczne; 2016, 2(24); 169 - 177
    1644-888X
    Pojawia się w:
    Zeszyty Naukowe PWSZ w Płocku. Nauki Ekonomiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ocena zagrożenia tąpaniami w kopalniach podziemnych uwzględniająca parametry drgań blisko ognisk wstrząsów - doświadczenia z polskich kopalń
    Rockburst hazard prognosis for underground mines taking into consideration tremor parameters close to the tremor sources - experiences from Polish mines
    Autorzy:
    Mutke, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/349188.pdf
    Data publikacji:
    2007
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    wstrząsy górnicze
    tąpnięcia
    bliskie pole falowe
    maksymalna amplituda prędkości drgań cząsteczek górotworu
    maksymalna amplituda przyspieszenia drgań cząsteczek górotoworu
    parametry źródła sejsmicznego
    obciążenie dynamiczne
    geofizyczne empiryczne kryterium potencjalnego zagrożenia tąpnięciem
    mining tremors
    rockburst
    near-field wave
    peak particle acceleration
    seismic source parameters
    dynamic loads
    geophysical empirical criterion for potential rockburst hazard
    Opis:
    Ocena zagrożenia tąpaniami oraz ocena stateczności wyrobisk podziemnych w kopalniach węgla wymaga znajomości nie tylko obciążeń statycznych, ale również obciążeń dynamicznych. Analiza skutków wstrząsów w kopalniach Górnośląskiego Zagłębia Węglowego w postaci różnego typu i intensywności uszkodzeń wykazała, że występowały one wówczas, gdy ogniska tych wstrząsów były zlokalizowane blisko (przeważnie do 100 m) od wyrobisk. Potwierdza to fakt, że parametry drgań w tych odległościach mają decydujące znaczenie dla zaistnienia tąpnięcia, bowiem duże wartości parametru PPV są równoznaczne z występowaniem odpowiednio dużych obciążeń dynamicznych. W artykule pokazano geofizyczne empiryczne kryterium potencjalnego zagrożenia tąpnięciem. Analizując udokumentowaną bazę 120 tąpnięć, jakie zaistniały w GZW w latach 1988-2006, dokonano weryfikacji przedstawionego kryterium, stwierdzając, że 90% wszystkich tąpnięć wystąpiło w strefie, w której prędkość drgań PPV osiągała wartości od 0,05 m/s do 1 m/s. Wyniki badań przedstawione w artykule mogą być wykorzystywane do czasoprzestrzennego projektowania eksploatacji górniczej w warunkach prognozowanej dużej sejsmiczności górotworu, jak również do racjonalnego doboru obudowy i działań profilaktycznych zabezpieczających funkcjonalność wyrobisk i przyczyniających się do poprawy poziomu bezpieczeństwa pracy.
    To study the rockburst hazard and underground mine working stability it is essential to know not only the static loads but also the dynamic loads. The performed analysis of the effects of mine tremors from the Upper Silesian Coal Basin, and of their intensity and various types of damage, clearly shows that they only occurred when the tremor sources were located close to the openings (mostly up to 100 m). These observations show that the ground motions parameters at such distances may be crucial for the occurrence of a rockburst because the high values of the PPV parameter are proportional to high dynamic stresses and underground hazards. An empirical criterion for potential rockburst hazard has been developed based on the worked out correlation dependences. In analyzing the documented database of 120 rockbursts from the Upper Silesian Coal Basin that occurred during a period from 1988 to 2006, the above mentioned criterion was verified. It has been found, that 90% of the rockbursts occurred in the area where peak particle velocity (PPV) reached values ranging from 0,05 m/s to 1 m/s. The investigation results presented in this this paper may be used in both the spatial and time table planning of mining operations under predicted high seismicity conditions and the rational choice of support and preventive actions ensuring functionality of mine workings and improvement in work safety level.
    Źródło:
    Górnictwo i Geoinżynieria; 2007, 31, 3/1; 439-450
    1732-6702
    Pojawia się w:
    Górnictwo i Geoinżynieria
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of near-collisions in the Tagus River Estuary using a marine traffic simulation model
    Autorzy:
    Rong, H.
    Teixeira, A.
    Soares, C. G.
    Powiązania:
    https://bibliotekanauki.pl/articles/135293.pdf
    Data publikacji:
    2015
    Wydawca:
    Akademia Morska w Szczecinie. Wydawnictwo AMSz
    Tematy:
    near-collisions
    ship domain
    marine traffic simulation
    artificial potential field
    AIS data
    maritime safety
    Opis:
    This paper evaluates near ship-ship collision situations in the Tagus River Estuary using a simulation model of ship navigation in restricted waters. The simulation model consists of a ship collision avoidance model based on the Artificial Potential Field (APF) method, which has been improved to account for the lateral distribution of traffic along the route, the ship type and length and speed development of the ships along the trajectory. AIS data of ships entering and leaving the port of Lisbon are analysed to obtain the main characteristics of traffic parameters used as input for the traffic simulation model, such as: the routes of the vessels, speed distribution along the routes, traffic density and characteristics of the ships in each route, among others. First, the improved model of ship navigation and the Monte Carlo simulation technique are used to simulate the marine traffic in the Tagus River Estuary. Then, the concept of “ship domain” is used as collision criterion to determine the number of near collisions and the locations where they are most likely to occur. Finally, the simulation results are compared to the ones obtained from raw AIS data to assess the capability of the simulation model for marine traffic risk analysis.
    Źródło:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2015, 43 (115); 68-78
    1733-8670
    2392-0378
    Pojawia się w:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Derivation of refraction statics solution for 3D seismic data in an onshore prospect Niger Delta field
    Autorzy:
    Adizua, Okechukwu Frank
    Anakwuba, Kenechukwu Emmanuel
    Onwuemesi, Ajana Godwin
    Powiązania:
    https://bibliotekanauki.pl/articles/184681.pdf
    Data publikacji:
    2019
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    near-surface imaging
    near-surface characterization
    starting model
    field statics
    datum statics
    refraction statics
    1nd residual statics
    2nd residual statics
    FFID configuration
    alignment of reflectors
    Opis:
    The near-surface imaging and characterization of an onshore prospect field in the Niger Delta was successfully carried out in a previous study (Adizua et al. 2019) using an integrated approach of combining inversion of refracted arrivals and uphole measurements. The output of that study which revealed the layer characteristics of the near-surface (0–500 m) over the prospect field is now being used as a starting model to derive a complete refraction statics solution to be adapted for processing the 3D seismic dataset from the prospect field. The complete statics solution derived included the field or datum statics, refraction statics, and the 1st and 2nd residual statics which addressed the unresolved and remnant spatial long and short wavelength statics effect on the traces across the investigated field. The comprehensive solution was then incorporated into a PROMAXTM routine and applied to the seismic datasets using appropriate flow commands to perform the statics correction procedure. The out-come of the derived and implemented statics correction was demonstrated on shot gathers from the field in FFID configuration. Results from the several shot gathers analyzed after the application of the statics correction across the field showed that traces were adjusted back to their appropriate positions. The reflectors became better aligned and assumed a near-hyperbolic pattern which is a positive indication that the derived and applied refraction statics solution was the most appropriate for the dataset.
    Źródło:
    Geology, Geophysics and Environment; 2019, 45, 2; 133-144
    2299-8004
    2353-0790
    Pojawia się w:
    Geology, Geophysics and Environment
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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