Pub Date : 2021-05-26DOI: 10.9734/bpi/nupsr/v5/8594d
B. Mytsyk, Y. Suhak, N. Demyanyshyn, O. Buryy, N. Syvorotka, D. Sugak, S. Ubizskii, H. Fritze
An interferometric approach according to a single-pass Mach-Zehnder interferometer was used to investigate the photoelasticity of the Ca3TaGa3Si2O14 (CTGS) crystal. The highest number of sample orientations for piezo-optic studies was used to demonstrate the accuracy of piezo-optic coefficient determination. Basing on the matrices of piezo-optic coefficients and of elastic stiffness coefficients, all the coefficients pik of the elastic-optic matrix are computed. The acousto-optic efficiency is assessed for the highest value of pik coefficient. The data from CTGS are validated with the similar values for La3Ga5SiO14 (langasite) crystals. CTGS M2 = 1.66·10-15 s3/kg has the greatest acoustooptic figure of merit, which is two to three times higher, compared to langasite, and strontium borate, respectively and are frequently employed in the UV spectral range for acousto-optic light modulation.
{"title":"Elasto-optic Effect and Its Spatial Anisotropy in Ca3TaGa3Si2O14 Crystals","authors":"B. Mytsyk, Y. Suhak, N. Demyanyshyn, O. Buryy, N. Syvorotka, D. Sugak, S. Ubizskii, H. Fritze","doi":"10.9734/bpi/nupsr/v5/8594d","DOIUrl":"https://doi.org/10.9734/bpi/nupsr/v5/8594d","url":null,"abstract":"An interferometric approach according to a single-pass Mach-Zehnder interferometer was used to investigate the photoelasticity of the Ca3TaGa3Si2O14 (CTGS) crystal. The highest number of sample orientations for piezo-optic studies was used to demonstrate the accuracy of piezo-optic coefficient determination. Basing on the matrices of piezo-optic coefficients and of elastic stiffness coefficients, all the coefficients pik of the elastic-optic matrix are computed. The acousto-optic efficiency is assessed for the highest value of pik coefficient. The data from CTGS are validated with the similar values for La3Ga5SiO14 (langasite) crystals. CTGS M2 = 1.66·10-15 s3/kg has the greatest acoustooptic figure of merit, which is two to three times higher, compared to langasite, and strontium borate, respectively and are frequently employed in the UV spectral range for acousto-optic light modulation.","PeriodicalId":287138,"journal":{"name":"Newest Updates in Physical Science Research Vol. 5","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133580955","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-05-26DOI: 10.9734/bpi/nupsr/v5/1981f
S. Abramov, M. Uss, V. Lukin, B. Vozel, K. Chehdi, K. Egiazarian
Multichannel (multispectral, hyperspectral) remote sensing data may include junk component images which have quality considerably worse than other components. This can be due to intensive noise or low dynamic range of information component in such junk channels (sub-bands). Such component images are sometimes ignored (not used in further processing or analysis). Meanwhile, they can be subject to pre-filtering (denoising) in order to enhance them. To do this effectively, we propose to exploit the so-called reference images – component images that have relatively high quality and that are characterized by high similarity with respect to the image subject to pre-filtering. Within the framework of this general idea, we study several particular problems: how to choose component images that can be exploited as references, what transformations of reference images can be used, and how to perform the denoising. It is shown that one can employ as references component images of the same resolution as junk ones as well as component images of a better resolution. Not only one but also two references can be exploited. Different filters can be used after decorrelation. Enhancement of filtered images according to different quality criteria is provided. Examples of denoising for real-life multichannel images are given demonstrating high efficiency of the proposed approach.
{"title":"Enhancement of Component Images of Multichannel Data by Denoising with Reference","authors":"S. Abramov, M. Uss, V. Lukin, B. Vozel, K. Chehdi, K. Egiazarian","doi":"10.9734/bpi/nupsr/v5/1981f","DOIUrl":"https://doi.org/10.9734/bpi/nupsr/v5/1981f","url":null,"abstract":"Multichannel (multispectral, hyperspectral) remote sensing data may include junk component images which have quality considerably worse than other components. This can be due to intensive noise or low dynamic range of information component in such junk channels (sub-bands). Such component images are sometimes ignored (not used in further processing or analysis). Meanwhile, they can be subject to pre-filtering (denoising) in order to enhance them. To do this effectively, we propose to exploit the so-called reference images – component images that have relatively high quality and that are characterized by high similarity with respect to the image subject to pre-filtering. Within the framework of this general idea, we study several particular problems: how to choose component images that can be exploited as references, what transformations of reference images can be used, and how to perform the denoising. It is shown that one can employ as references component images of the same resolution as junk ones as well as component images of a better resolution. Not only one but also two references can be exploited. Different filters can be used after decorrelation. Enhancement of filtered images according to different quality criteria is provided. Examples of denoising for real-life multichannel images are given demonstrating high efficiency of the proposed approach.","PeriodicalId":287138,"journal":{"name":"Newest Updates in Physical Science Research Vol. 5","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116994922","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-01-15DOI: 10.9734/bpi/nupsr/v5/8709d
A. Msezane, A. Baltenkov
Within the Dirac- and Lorentz-bubble potential models an electronic structure of the doubly-charged negative ion has been studied by a variational method. It is shown that even in the first approximation of this method when a trial wave function of the two electrons is represented as a product of one-electron functions the total energy of the system is negative, a manifestation of the existence of a stable state of the doubly-charged negative ion in these models. The second electron affinity of C60 according to estimation is about 1 eV. The photodetachment cross sections of this ion have been calculated as well. Near threshold behavior of cross section is found to exhibit peculiar and interesting behavior. The first cross section accompanied by the transformation of the doubly-charged negative ion into a singly-charged one is exponentially small near the process threshold. The second cross section corresponds to the photodetachment of a singly-charged ion; it increases at the threshold as a power function of the kinetic energy of the photoelectron. These cross sections are of the same order as the photodetachment cross sections of atomic ions with the same electron affinity. AMS (MOS) Subject Classification. 70G75, 81V10, 81V55
{"title":"Doubly-charged Negative Ion of C60 Molecule","authors":"A. Msezane, A. Baltenkov","doi":"10.9734/bpi/nupsr/v5/8709d","DOIUrl":"https://doi.org/10.9734/bpi/nupsr/v5/8709d","url":null,"abstract":"Within the Dirac- and Lorentz-bubble potential models an electronic structure of the doubly-charged negative ion has been studied by a variational method. It is shown that even in the first approximation of this method when a trial wave function of the two electrons is represented as a product of one-electron functions the total energy of the system is negative, a manifestation of the existence of a stable state of the doubly-charged negative ion in these models. The second electron affinity of C60 according to estimation is about 1 eV. The photodetachment cross sections of this ion have been calculated as well. Near threshold behavior of cross section is found to exhibit peculiar and interesting behavior. The first cross section accompanied by the transformation of the doubly-charged negative ion into a singly-charged one is exponentially small near the process threshold. The second cross section corresponds to the photodetachment of a singly-charged ion; it increases at the threshold as a power function of the kinetic energy of the photoelectron. These cross sections are of the same order as the photodetachment cross sections of atomic ions with the same electron affinity. AMS (MOS) Subject Classification. 70G75, 81V10, 81V55","PeriodicalId":287138,"journal":{"name":"Newest Updates in Physical Science Research Vol. 5","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126018031","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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