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Tytuł:
Growth and study of nonlinear optical crystals at the Hungarian Academy of Sciences
Autorzy:
Földvári, I.
Polgár, K.
Péter, A.
Beregi, E.
Szaller, Z.
Powiązania:
https://bibliotekanauki.pl/articles/308743.pdf
Data publikacji:
2000
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
crystal growth
nonlinear optical materials
Opis:
The former Research Laboratory for Crystal Physics continues the growth and defect structure investigation of nonlinear optical single crystals in a new organization, as a part of the Research Institute for Solid State Physics and Optics, Hungarian Academy of Sciences. The aim of the activity is to prepare specific crystals for basic and applied research as well as for applications. We improve the quality or modify the properties of well known nonlinear oxide and borate crystals and develop new materials. The principle nonlinear optical crystals in our profile are the followings: Paratellurite (TeO2), congruent, Mg-doped and stoichiometric lithium niobate (LiNbO3), a variety of sillenite structured crystals (Bi12MeO20, Me=Si, Ge, Ti, etc.), bismuth tellurite (Bi2TeO5) and nonlinear borates (BBO-beta-BaB2O4, LBO-LiB3O5, LTB-Li2B4O7, CLBO-CsLiB6O10 and YAB-YAI3(BO3)4). Details of the crystal preparation and the major achievements are discussed in the paper.
Źródło:
Journal of Telecommunications and Information Technology; 2000, 1-2; 37-41
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Highly sensitive chitosan-based optical fluorescent sensor for gaseous methylamine detection
Autorzy:
Mironenko, Aleksandr Yu
Sergeev, Aleksandr A.
Nazirov, Aleksandr E.
Voznesenskiy, Sergey S.
Bratskaya, Svetlana Yu.
Mirochnik, Anatoliy G.
Powiązania:
https://bibliotekanauki.pl/articles/1034571.pdf
Data publikacji:
2017
Wydawca:
Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
Tematy:
composites
luminescence
optical materials
thin films
Opis:
An optical fluorescent sensor based on a chitosan thin film co-doped with Eu3+ and a bromothymol blue pH indicator has been developed. Near-UV to visible (350–400 nm) excitation of the europium (III) chelate complexes with 1,3-diphenyl-1,3-propanedione exhibits a typical lanthanide emission with maximum at 618 nm. Luminescent spectra of the Eu3+ complex were found to be insensitive to the presence of methylamine gas. Therefore, bromothymol blue, a non-fluorescent pH indicator with an absorbance maximum of deprotonated form close to the Eu3+ emission band was added to the film to provide a non-fluorescent reversible response to different methylamine concentrations, which can be detected by measuring the Eu3+ emission.
Źródło:
Progress on Chemistry and Application of Chitin and its Derivatives; 2017, 22; 159-165
1896-5644
Pojawia się w:
Progress on Chemistry and Application of Chitin and its Derivatives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation on Nucleation Kinetics, Growth and Nonlinear Optical Properties of L-Cystine Hydrochloride Crystal
Autorzy:
Manivannan, D.
Kirubavathi, K.
Selvaraju, K.
Powiązania:
https://bibliotekanauki.pl/articles/1029827.pdf
Data publikacji:
2018-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
crystal growth
nucleation kinetics
optical materials
NLO
Opis:
The semiorganic nonlinear optical crystal of amino-carboxyl acid family, L-cystine hydrochloride (LCHCl) was successfully grown from its aqueous solution by the slow evaporation solution growth method. The solubility, metastable zone width and induction period were determined for the first time experimentally and there by the possibility of growing bulk crystals of LCHCl using deionized water as solvent. The induction period was recorded for the different supersaturation ratios (S=1.2, 1.3, 1.4, and 1.5), which reveals that the induction period of LCHCl decreases with increase in supersaturation. The nucleation kinetic parameters such as critical free energy, change of volume free energy, critical radius, number of molecules in the critical nucleus and nucleation rate have been evaluated for LCHCl crystals. The interfacial energy values of LCHCl were determined for different supersaturation ratio by means of varying temperatures. The single crystal X-ray diffraction gives the lattice parameters value of the grown crystals. The second harmonic generation efficiency was confirmed by the Kurtz-Perry powder method. The laser damage threshold energy of the grown crystal indicates that grown crystal has excellent resistance to laser radiation also compared with known other nonlinear optical crystals.
Źródło:
Acta Physica Polonica A; 2018, 133, 1; 63-67
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nano-silica reinforced hybrid light-diffusing films with enhanced mechanical and thermal properties
Autorzy:
Sun, X
Li, N.
Hang, J
Jin, L.
Shi, L
Cheng, Z.
Shang, D
Powiązania:
https://bibliotekanauki.pl/articles/175043.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
optical materials and properties
nanocomposites
light-diffusing films
sol-gel preparation
nanoparticles
Opis:
Ultraviolet-curable hybrid light-diffusing films with good optical, mechanical and thermal properties were prepared by involving vinyl-silane-modified nano-silica into light-diffusing films. The light-diffusing films were two-phase materials consisting of UV-curable matrix and light-diffusing agent. The effect of three different light-diffusing agents, viz. inorganic layered particle (CaCO3), spherical acrylic resin (MR-7HG) and organosilicone resin (KMP-590) and their contents, on the optical properties of light-diffusing films was studied. The results showed the light-diffusing film exhibited good optical properties (the transmittance was 90.7% and the haze was 95.5%) when KMP-590 was a light-diffusing agent and its content was 25%. It was because that KMP-590 showed good transparency, good dispersion in the UV-curable matrix and the greater difference in refractive index with UV-curable matrix and polycarbonate substrate. Furthermore, the effect of nano-silica on the optical, mechanical and thermal properties of the hybrid light-diffusing films was investigated. Compared to that of the light-diffusing films without nano-silica, the haze of the hybrid light-diffusing films containing nano-silica was lightly enhanced to above 98%, while their transmittance basically remained unchanged at a high value (above 89%). Additionally, scratch and abrasion resistance of the hybrid films were obviously improved by nano-silica especially with the particle size of 10–15 nm. Furthermore, the mechanical property and thermal stability of the hybrid films were improved as the content of nano-silica with the particle size of 10–15 nm increased. The enhanced mechanical property and thermal stability of the films could be attributed to the dense structure induced by the increase in network density with the addition of vinyl-silane-modified nano-silica.
Źródło:
Optica Applicata; 2015, 45, 3; 393-404
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Destrukcyjne oddziaływanie promieniowania UV z poszczególnych podzakresów widmowych na materiały optyczne
The destructive effects of UV radiation with different spectral sub-bands in optical materials
Autorzy:
Hemka, L.
Piotrowski, L.
Powiązania:
https://bibliotekanauki.pl/articles/160203.pdf
Data publikacji:
2012
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Elektrotechniki
Tematy:
destruktywne oddziaływanie UV
materiały optyczne
filtry barwne
szkło
destructive effects of UV
optical materials
color filters
glass
Opis:
W artykule przedstawiono wyniki prac eksperymentalnych prowadzonych w celu zbadania procesów destrukcyjnego oddziaływania na materiały optyczne promieniowania UV z poszczególnych podzakresów widmowych (UVA, UVB, UVC). Zbadano i przeanalizowano zmiany w czasie współczynnika przepuszczania oraz parametrów barwowych trzech rodzajów filtrów barwnych Schotta, soczewki, okularów będących elementem wyposażenia kabiny solaryjnej oraz próbki szkła boro-krzemowego.
The paper presents results of experimental work carried out to investigate the impact of destructive processes in UV optical materials from each sub-spectrum (UVA, UVB and UVC). Examined and analyzed the changes in time and the transmission factor of three types of parameters Kelvin Schott color filters, lenses, glasses that are part of indoor tanning equipment and samples cabs boro-silicateglass.
Źródło:
Prace Instytutu Elektrotechniki; 2012, 256; 37-46
0032-6216
Pojawia się w:
Prace Instytutu Elektrotechniki
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Charakterystyki wzbudzeniowo-emisyjne nanometrycznych proszków tlenku cyrkonu domieszkowanych jonami itru, europu i prazeodymu
Excitation-emission characteristics of zirconium dioxide nanometric powders doped with yttrium, europium and praseodymium ions
Autorzy:
Mierczyk, Z.
Kałdoński, G.
Mierczyk, J.
Łojkowski, W.
Fidelus, J. D.
Opalińska, A.
Powiązania:
https://bibliotekanauki.pl/articles/208587.pdf
Data publikacji:
2011
Wydawca:
Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
Tematy:
spektrofluorymetria
fotoluminescencja
luminofory
półprzewodnikowe źródła światła białego
diody elektroluminescencyjne
spectrofluorimetry
luminescence
phosphors
optical materials
nanopowders
semiconductor sources of white light
Opis:
W pracy przedstawiono wyniki badań materiałów luminescencyjnych na osnowie dwutlenku cyrkonu, domieszkowanych jonami itru, europu i prazeodymu, przeznaczonych do nowoczesnych półprzewodnikowych źródeł światła białego. Przeprowadzono pomiary charakterystyk wzbudzeniowo-emisyjnych i wyznaczono podstawowe parametry optyczne luminoforów.
In this paper we focus on high-impact luminescence of Eu²⁺ or Pr²⁺doped ZrO₂ nanocrystals stabilized by Y₂O₃. As a class of inorganic luminescent phosphor, wide-band gap ZrO₂ has received considerable attention because of its utility for existing and future optoelectronic devices as a suitable host for rare-earth ions. In the article were gathered Exciting-emitting spectra of nanocrystals obtained by the hydrothermal microwave-driven process are presented. All investigated characteristics indicate the usability of studied materials as red luminescent phosphors.
Źródło:
Biuletyn Wojskowej Akademii Technicznej; 2011, 60, 1; 7-14
1234-5865
Pojawia się w:
Biuletyn Wojskowej Akademii Technicznej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Theoretical investigation of slab waveguide sensor using anisotropic metamaterial
Autorzy:
Taya, S. A.
Powiązania:
https://bibliotekanauki.pl/articles/174457.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
anisotropic waveguides
optical sensing
double negative materials
Opis:
A three-layer slab waveguide with air as a substrate, lossless dielectric as a guiding film, and anisotropic double negative material as a cladding is explored as an optical sensor for refractometry applications. The double negative material is assumed to have a negative electric permittivity and magnetic permeability only along the wave propagation direction. The sensitivity of a guided mode to the variation in the refractive index of air substrate is derived and studied for the first few guided modes. It is found that the sensitivity can be enhanced with decreasing the guided light frequency as well as the film thickness. The sensitivity can reach 100% for some waveguide configurations.
Źródło:
Optica Applicata; 2015, 45, 3; 405-417
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of factors determinant of siliceous electrical porcelain resistance to structural degradation
Autorzy:
Ranachowski, P.
Ranachowski, Z.
Kudela Jr., S.
Pawełek, A.
Piątkowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/351813.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
porcelain insulating materials
ageing processes
acoustic emission (AE)
optical microscopy
Opis:
The subject of this study was investigation of the factors that have a decisive influence on the resistance of siliceous porcelain to degradation processes. There was tested material C 110 type, which is widely used for the production of low-voltage (LV) elements such as insulators and bushings. On the basis of mechanical-acoustic and microscopic research of small-sized samples, which were subjected to compression, there were distinguished successive stages of degradation of the material structure. In the authors* opinion, they have a reference to the ageing process, taking place during many years of work under operating conditions. Thus, it was possible to assess the structural factors that determine the durability and reliability of LV electroinsulating elements. The results were related to electrical aluminous porcelains.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 3; 1489-1496
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optical characteristics of Portulaca grandiflora-doped Cellulose using the spray pyrolysis technique
Autorzy:
Alaridhee, Tahseen
Obeed, Mohammed T.
Malk, Fatima H.
Dhahi, Baheya A.
Powiązania:
https://bibliotekanauki.pl/articles/27315701.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
Tematy:
green materials
optical properties
natural dye
biopolymer
spray pyrolysis technique
Opis:
Thin films were prepared based on cellulose polymer doped with different ratios of natural dye derived from Portulaca grandiflora concentrations. The polymer and natural dye were extracted from eco-friendly materials - the cell walls of millet husks and Portulaca grandiflora, respectively. The spray pyrolysis technique was applied to prepare thin film samples to control the film morphology and reduce the roughness of the surface. Optical microscope and Fourier transform infrared were used to analyse structural, morphological, and functional groups for all samples, respectively. The peak absorbance, extinction coefficient, optical bandgap, Urbach energy, and optical conductivity for the thin films were determined using ultraviolet-visible spectroscopy. The results show an enhancement in the optical characteristics when the natural cellulose is doped with a dye. Doping cellulose with 5% P. grandiflora has led to a considerable reduction in the energy bandgap (to 1.95 eV), compared to the sample doped with 1%.
Źródło:
Opto-Electronics Review; 2023, 31, 3; art. no. e146553
1230-3402
Pojawia się w:
Opto-Electronics Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of Modified Aluminous Porcelain Subjected to Mechanoacoustic Tests
Autorzy:
Ranachowski, P.
Ranachowski, Z.
Wieczorek, K.
Jaroszewski, M.
Kudela, S. jr.
Powiązania:
https://bibliotekanauki.pl/articles/355059.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
electrical porcelain materials
ageing processes
acoustic emission
AE
optical microscopy
Opis:
The paper presents the microscopic and mechanoacoustic study of degradation processes of the porcelain material C 130 type. This kind of material is used in the production of the most durable and reliable electrotechnical elements. Raw material composition of the studied porcelain was modified. This had an impact on the inner properties, cohesion and – in consequence – on operational properties of the material. Using mechanical-acoustic and microscopic methods of testing of small-size samples that were subjected to compression, it was possible to distinguish successive stages of degradation of the porcelain structure. These stages were generally typical of the porcelain materials. In the authors’ opinion, they are connected to the ageing process happening over many years of work under operating conditions. Optimization of composition and technological properties – important during technological processes – resulted in a slight decrease in inner cohesion of the porcelain. When compared to the reference material – typical domestic C 130 material, mechanical strength was somewhat lower. Carried out investigations proved that resistance of the investigated material to the ageing degradation process – during long term operation – also decreased. The improvement of technological parameters and the reduction in the number of defective elements occurred simultaneously with some decrease in the operational parameters of the material. To restore their initial high level, further work is needed to optimize the raw material composition of the porcelain.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 4; 1821-1826
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optical Fiber Technology 2012
Autorzy:
Romaniuk, R. S.
Wójcik, W.
Powiązania:
https://bibliotekanauki.pl/articles/226186.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
lightguide
optical fiber
photonics
optical fiber photonics
optoelectronics
optical fiber technology
optical fiber glasses and polymers
active optical fibers
photonic optical fibers
microstructured optical fibres
microoptics
photonic materials and metamaterials
fiber lasers
Opis:
The Conference on Optical Fibers and Their Applications, Nałęczów 2012, in its 14th edition, which has been organized since more than 35 years, has summarized the achievements of the local optical fiber technology community, for the last year and a half. The conference specializes in developments of optical fiber technology, glass and polymer, classical and microstructured, passive and active. The event gathered around 100 participants. There were shown 60 presentations of 20 research and application groups active in fiber photonics, originating from academia and industry. Topical tracks of the Conference were: photonic materials, planar waveguides, passive and active optical fibers, propagation theory in nonstandard optical fibers, and new constructions of optical fibers. A panel discussion concerned teaching in fiber photonics. The conference was accompanied by a school on Optical Fiber Technology. The paper summarizes the chosen main topical tracks of the conference on Optical Fibers and Their Applications, Nałęczów 2012. The papers from the conference presentations will be published in Proc. SPIE, including a conference version of this paper. The next conference of this series is scheduled for January 2014 in Białowieża.
Źródło:
International Journal of Electronics and Telecommunications; 2013, 59, 2; 131-140
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development of Optical Fiber Technology in Poland
Autorzy:
Dorosz, J.
Romaniuk, R. S.
Powiązania:
https://bibliotekanauki.pl/articles/226479.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
optical fibers
optical communication systems
photonic sources and detectors
photonic sensors
integrated optics
photonics applications
photonic materials
Opis:
In this paper, the authors, chairmen of the 13th Conference on Optical Fibers and Their Applications OFA 2011, and editors of the conference proceedings summarize the development of optical fiber technology in Poland (during the period of 2009-2011) on the basis of papers presented there and consecutively published in this volume. The digest is thus not full but covers the periodically presented material every 18 months during the meetings on optical fibers in Białystok-Białowieża and Lublin-Krasnobród.
Źródło:
International Journal of Electronics and Telecommunications; 2011, 57, 2; 191-197
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Measurements of SMA properties using advanced optical methods
Zastosowanie zaawansowanych metod optycznych w pomiarach własności stopów z pamięcią kształtu
Autorzy:
Rączka, W.
Sioma, A.
Powiązania:
https://bibliotekanauki.pl/articles/368838.pdf
Data publikacji:
2010
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
stopy z pamięcią kształtu
pomiary
metody optyczne
smart materials
measurement
optical methods
Opis:
Shape Memory Alloys are called smart or advanced materials because of their special features which are very useful in the latest solutions. Therefore, it is very important to gain a good knowledge of all these features for the purposes of modeling, describing, and ultimately controlling the behavior of these materials. This paper describes how to measure selected properties of SMA. It describes how to measure real temperature and diameter of thin SMA wires. At the end, we use a high speed camera to find out how an SMA wire breaks during stretching.
Stopy z pamięcią kształtu (Shape Memory Alloys - SMA) nazywane są zaawansowanymi materiałami ze względu na ich specjalne własności, które są chętnie stosowane w nowoczesnych rozwiązaniach technicznych. Identyfikacja ich w celu lepszego poznania, modelowania a także sterowania ich parametrami jest niezbędna we właściwym stosowaniu tych materiałów. W artykule opisano, jak zmierzyć rzeczywistą temperaturę i średnicę cienkiego drutu SMA z wykorzystaniem kamery termowizyjnej i mikrometru laserowego. Opisano również badania z użyciem kamery HSC zjawisk zachodzących w trakcie zerwania drutu SMA.
Źródło:
Mechanics and Control; 2010, 29, 1; 32-39
2083-6759
2300-7079
Pojawia się w:
Mechanics and Control
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza porowatości wyrobów metalowych metodą emisyjnej spektrometrii optycznej ze wzbudzeniem iskrowym
Porosity analysis of metal products using spark optical emission spectrometry
Autorzy:
Spiewok, W.
Powiązania:
https://bibliotekanauki.pl/articles/181872.pdf
Data publikacji:
2013
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Metalurgii Żelaza im. Stanisława Staszica
Tematy:
emisyjna spektrometria optyczna
wady materiałowe
optical emission spectrometry
defects in materials
porosity
Opis:
Przeprowadzono badania umożliwiające identyfikację wad próbek metalowych w trakcie analizy składu chemicznego metodą emisyjnej spektrometrii optycznej. W artykule przedstawiono wpływ właściwości badanych materiałów na zjawiska zachodzące w czasie pierwszych sekund działania iskrą elektryczną na próbkę. Zaproponowano metodę pomiaru porowatości materiału na podstawie szybkości zmian sygnału analitycznego rejestrowanego w pierwszych sekundach analizy.
The research has been conducted to identify defects in metal samples in analysis of chemical composition by optical emission spectrometry. The article shows the impact of the properties of tested materials on the phenomena occurring during the first seconds of the electric spark action on the sample. A method for measuring porosity based on the rate of changes in the analytical signal recorded in the first seconds has been proposed.
Źródło:
Prace Instytutu Metalurgii Żelaza; 2013, T. 65, nr 3, 3; 22-28
0137-9941
Pojawia się w:
Prace Instytutu Metalurgii Żelaza
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Diminutive left-handed plasmonic nanoantenna-lens system in optical realm: ultraviolet emission and flat lens application
Autorzy:
Rajput, Monika
Dabas, Bhawana
Saini, Than Singh
Mehta, Neeru
Powiązania:
https://bibliotekanauki.pl/articles/174455.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
left-handed materials
negative refraction
plasmonic optical nanoantenna
second harmonic generation
flat lens
Opis:
In present paper, a tunable left-handed plasmonic nanoantenna is designed to attain ultraviolet emission through a second harmonic generation with a phase harmonic condition. For the devised structure, the dispersion properties and negative values of the magnetic permeability and the electric permittivity show that the designed structure is left-handed for the primary wave (red light) and right-handed for the second harmonic wave (ultraviolet light). The 3D finite-difference time-domain method is employed to reveal its nonpareil skills (i.e. immense left-handed transmission efficiency and far-field spectrum exhibiting directionality). Attained results by numerical calculation for the second harmonic generation are accomplished with finite-difference time-domain analysis. The impact of physical parameters on transmission and dispersion characteristics is also scrutinized. Furthermore, flat lens application for a red light region with a centered wavelength at λ = 650 nm from the guileless design of LHM with no aberration is triumphed. Ultimately, a multifunction left-handed material is designed revealing tremendous potential to amass and abridge future applications in one architecture.
Źródło:
Optica Applicata; 2019, 49, 4; 679-692
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
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