Laser Spectroscopy of Materials Used in Paintings

1990 ◽  
Vol 185 ◽  
Author(s):  
Londa J. Larson ◽  
Kyeong-Sook Kim Shin ◽  
Jeffrey I. Zink
Keyword(s):  
Laser Spectroscopy ◽  
Excitation Wavelength ◽  
Photoluminescence Spectra ◽  
Bulk Materials ◽  
Drying Oils ◽  
Natural Resins ◽  
Materials Used

AbstractA wide variety of natural resins, waxes, gums, drying oils and proteinaceous materials used on paintings are photoluminescent. The photoluminescence spectra of these materials are reported and discussed. The application of this technique towards the identification of these materials is considered. Both bulk materials and films prepared from selected bulk materials were studied and a comparison is made between the bulk and film samples. Temperature and excitation wavelength studies are reported and discussed for several of the samples.

scholarly journals Pneumatic transport of bulk materials in construction of composite floating docks

2021 ◽  
pp. 1-14
Author(s):  
A.S. Rashkovskyi ◽  
A.V. Shchedrolosiev ◽  
V.M. Neiman ◽  
O.Y. Kanash
Keyword(s):  
Wear Resistance ◽  
Transport System ◽  
Flow Rate ◽  
Pneumatic Transport ◽  
Pipe Diameter ◽  
Bulk Materials ◽  
Useful Life ◽  
Materials Used ◽  
Theoretical Results

Investigations of pneumatic transport of bulk materials used in shipbuilding have carried out. Their abrasiveness, wear of straight and curved sections of pipelines were investigated. Theoretically, the dependences of the amount of wear on various factors were defined: abrasiveness and concentration of transported particles, flow rate, pipe diameter and wear resistance of its material, structural and operational features of the transport system, etc. Formulas for determining the maximum useful life of straight and curved sections of pipelines are obtained. Theoretical results confirmed experimentally.

Optical Absorption and Photoluminescence Properties of Dy3+ Ions in Bi2O3-SiO2-B2O3 Glass System

2014 ◽  
Vol 979 ◽  
pp. 280-284
Author(s):  
Narong Sangwaranatee ◽  
Yaowaluk Tariwong ◽  
Sunisa Sarachai ◽  
Jakrapong Kaewkhao ◽  
Natthakridta Chanthima
Keyword(s):  
Optical Absorption ◽  
Emission Spectrum ◽  
Molar Volume ◽  
Borosilicate Glass ◽  
Excitation Wavelength ◽  
Optical Absorption Spectra ◽  
Photoluminescence Spectra ◽  
Photoluminescence Properties ◽  
Melt Quenching ◽  
Absorption Bands

This research studied the effect of dysprosium on the physical, optical and luminescence properties of the bismuth borosilicate glass in compositions 40Bi2O3 : 20SiO2 : (40-x)B2O3 : xDy2O3 (where x = 0.0, 0.5, 1.0, 1.5, 2.0 and 2.5 mol%). The glass systems have been prepared at 1100 °C by melt quenching technique. The results showed that the density and molar volume of glass samples are between 4.6477 ± 0.0020 to 5.0047 ± 0.0041 g/cm3 and 45.6608 to 48.6797 cm3/mol, respectively. The values of density and molar volume of these glasses were not depend on the Dy2O3 concentration. The optical absorption spectra of glass samples in the UV-Vis-NIR region shows absorption bands at 794, 906, 1094, 1276 and 1690 nm, respectively. The photoluminescence spectra show emission bands at 482 (blue), 576 (green), 663 (yellow) and 756 (red) nm under 453 nm excitation wavelength. The emission spectrum at 576 nm has shown a strongest intensity.

Surface Modification Technologies for Durable Space Polymers

MRS Bulletin ◽  
2010 ◽  
Vol 35 (1) ◽  
pp. 55-65 ◽  
Author(s):  
J.I. Kleiman
Keyword(s):  
Surface Modification ◽  
Protective Coatings ◽  
Present Situation ◽  
Low Earth Orbit ◽  
Space Environment ◽  
Metal Foil ◽  
Bulk Materials ◽  
Long Duration ◽  
Materials Used ◽  
Traditional Approaches

AbstractMany polymers, paints, and organic-based materials exposed to the space environment undergo dramatic changes and irreversible degradation of physical and functional characteristics. While many protective approaches, including protective coatings and mechanical metal foil wrapping or cladding—especially for synthesized bulk materials, are used to reduce the effects of the space environment, the protection of such materials in space remains a major challenge, especially for future long-duration exploration missions or permanent space stations. In addition to the traditional approaches, surface modification processes are used increasingly to protect or to impart new properties to materials used in the space environment. This article presents a brief overview of the present situation in the field of surface modification of space materials. A number of surface modification solutions that differ from the traditional protective coating approaches are discussed that change the surface properties of treated materials, thus protecting them from the hazards of low Earth orbit and geostationary orbit environments or imparting new functional properties. Examples of their testing, characterization, and applications are provided.

scholarly journals Photoluminescence spectra of 1 MeV electron beam irradiated In0.53Ga0.47As/InP quantum well and bulk materials

2015 ◽  
Vol 64 (15) ◽  
pp. 154217
Author(s):  
Ma Li-Ya ◽  
Li Yu-Dong ◽  
Guo Qi ◽  
Ai Er-Ken ◽  
Wang Hai-Jiao ◽  
...  
Keyword(s):  
Electron Beam ◽  
Quantum Well ◽  
Photoluminescence Spectra ◽  
Bulk Materials

scholarly journals Effect of impurities and disordering on the photoluminescence of crystals and glasses in the system Li2O - 7GeO2

2019 ◽  
Vol 27 (1) ◽  
pp. 51-56
Author(s):  
O. V. Ohiienko ◽  
V. N. Moiseienko ◽  
M. D. Volnyanskij
Keyword(s):  
Luminescence Band ◽  
Material Structure ◽  
Excitation Wavelength ◽  
Photoluminescence Spectra ◽  
Broad Luminescence Band ◽  
Intense Luminescence ◽  
Doped Glasses ◽  
Effect Of Impurities ◽  
Oxygen Complexes ◽  
Octahedral Configuration

The work is devoted to the study of photoluminescence spectra of weakly polar ferroelectric crystals Li2Ge7O15 and Li2O – 7GeO2 glasses. For all initial samples was observed the wide intensive luminescence band with maximum in the region of 525–550 nm. The spectral distribution of intensity and the position of the maximum of the band for a Li2Ge7O15 crystal depended on the excitation wavelength (λex=405 nm or 365nm were used). The spectral profile of the luminescence band was broadened in glass containing of 0.67% copper. The intensity of the luminescence band was decreased 6 times for glass doped with Cr3+ ions (0.01%) as compared with glass containing Cu2+ ions. The intense luminescence band of Cr3+ ions with λmax=659nm was appeared starting from 600. The assumption about the nature of the broad luminescence band observed in both nominally pure and doped glasses and crystals was made: the source of luminescence can be germanium - oxygen complexes [GeO4] and [GeO6] of the tetrahedral and octahedral configuration in the material structure.

Optical and Luminescence Properties of Dy3+ Doped in Soda Lime Borate Glasses

2016 ◽  
Vol 702 ◽  
pp. 51-56 ◽  
Author(s):  
Suwimon Ruengsri ◽  
Nattapon Srisittipokakun ◽  
Falak Zaman ◽  
Gul Rooh ◽  
Jakrapong Kaewkhao
Keyword(s):  
Photo Luminescence ◽  
Soda Lime ◽  
Luminescence Properties ◽  
Luminescence Spectra ◽  
Excitation Wavelength ◽  
White Led ◽  
Photoluminescence Spectra ◽  
Melt Quenching ◽  
Hypersensitive Transition ◽  
Absorption Measurements

The aim of this study is to develop soda lime borate (SLB) doped with Dy3+ glass and investigate their optical and luminescence properties, for different applications in photonics and optoelectronics. The glass were melt by conventional melt quenching technique. Optical properties have been determined by measuring their absorption spectra and luminescence properties were studied by photo luminescence spectra. From optical absorption measurements, there are ten peaks with transition 6H15/2 to 6F11/2 + 6H9/2 at 1262 nm has higher spectral intensity and is a hypersensitive transition. As a result of 350 nm excitation the photoluminescence spectra have four peaks. Higher luminescence intensity peak was observed for 0.5 mol% Dy3+ doped SLB glass at 4F9/2 to 6H13/2 (575 nm). Hence it is suggest from the chromaticity results that SLB glasses with different Dy2O3 concentration may be a promising glass for white LED under 350 nm excitation wavelength. Further investigation is under way for the optimization of different dopend concentration in the SLB glass.

Crystal Structure and Luminescence of Layered Perovskites Sr3LnInSnO8

2015 ◽  
Vol 230 ◽  
pp. 67-72 ◽  
Author(s):  
Yuriy Titov ◽  
Sergiy G. Nedilko ◽  
Vitalii Chornii ◽  
V. Scherbatskii ◽  
Nadiya Belyavina ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Crystal Structures ◽  
Powder Diffraction ◽  
Luminescence Properties ◽  
Excitation Wavelength ◽  
Photoluminescence Spectra ◽  
Photoluminescence Properties ◽  
X Ray ◽  
Layered Perovskites

The Sr3LnInSnO8(Ln = La, Pr, Nd) layered perovskites were synthesized and their structures have been determined by X-ray powder diffraction. Luminescence properties of the synthesized polycrystalline compounds Sr3PrInSnO8and Sr3NdInSnO8were investigated. Photoluminescence spectra of Sr3PrInSnO8substantially depend on excitation wavelength unlike Sr3NdInSnO8compound. The correlations between peculiarities of the crystal structures and photoluminescence properties have been discussed.

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