Zobrazeno 1 - 10
of 41
pro vyhledávání: '"Petia Petrova"'
Autor:
Lyubomir Aleksandrov, Aneliya Yordanova, Margarita Milanova, Reni Iordanova, Peter Tzvetkov, Pavel Markov, Petia Petrova
Publikováno v:
Molecules, Vol 29, Iss 15, p 3452 (2024)
In this paper, the crystallization behavior of 50ZnO:47B2O3:3Nb2O3:0.5Eu2O3 (G-0 h) glass has been investigated in detail by DSC, XRD and TEM analysis. The luminescent properties of the resulting glass-ceramics were also investigated. By XRD and TEM
Externí odkaz:
https://doaj.org/article/3200387ee35740ae873bb1766fd6c9cb
Autor:
Aneliya Yordanova, Lyubomir Aleksandrov, Margarita Milanova, Reni Iordanova, Petia Petrova, Nikolay Nedyalkov
Publikováno v:
Molecules, Vol 29, Iss 11, p 2470 (2024)
Glasses with the compositions in mol % of 50ZnO:(50 − x)B2O3:0.5Eu2O3:xWO3, x = 0, 1, 3, 5 and 10 were obtained by applying the melt-quenching method and investigated by Raman spectroscopy, DSC analysis and photoluminescence (PL) spectroscopy. Rama
Externí odkaz:
https://doaj.org/article/855209571fd34e6688042d6ec764dbde
Autor:
Reni Iordanova, Margarita Milanova, Aneliya Yordanova, Lyubomir Aleksandrov, Nikolay Nedyalkov, Rositca Kukeva, Petia Petrova
Publikováno v:
Materials, Vol 17, Iss 6, p 1415 (2024)
The effect of the addition of Nb2O5 (up to 5 mol%) on the structure and luminescent properties of ZnO-B2O3 glass doped with 0.5 mol% (1.32 × 1022) Eu2O3 was investigated by applying infrared (IR), Raman and photoluminescence (PL) spectroscopy. Throu
Externí odkaz:
https://doaj.org/article/327005c7e031456e906a5b5b137a4b37
Autor:
Aneliya Yordanova, Margarita Milanova, Reni Iordanova, Margit Fabian, Lyubomir Aleksandrov, Petia Petrova
Publikováno v:
Materials, Vol 16, Iss 20, p 6779 (2023)
In this study, we investigated the influence of Bi2O3 and WO3 on both structure and optical properties of 50ZnO:(49 − x)B2O3:1Bi2O3:xWO3; x = 1, 5, 10 glasses doped with 0.5 mol% Eu2O3. IR spectroscopy revealed the presence of trigonal BØ3 units c
Externí odkaz:
https://doaj.org/article/79c31601f732455abace522e8acc73f4
Autor:
Galia Gentscheva, Krastena Nikolova, Veselina Panayotova, Katya Peycheva, Lubomir Makedonski, Pavlo Slavov, Poli Radusheva, Petia Petrova, Ina Yotkovska
Publikováno v:
Life, Vol 13, Iss 3, p 845 (2023)
Arthrospira platensis is a filamentous cyanobacterium of the class Cyanophyceae and is the most cultivated photosynthetic prokaryote. It is used in the pharmaceutical sector, medicine and the food industry. It has a rich micro- and macro-element comp
Externí odkaz:
https://doaj.org/article/0579c3c42cb2402e88f2908ca960538e
Autor:
Iovka Koseva, Velin Nikolov, Rosica Nikolova, Peter Tzvetkov, Petar Ivanov, Petia Petrova, Reni Tomova, Nikola Kuvandjiev, Mihail Tarassov
Publikováno v:
Luminescence. 37:1492-1503
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::065acc61a84c139922089830ea6ac7e0
https://doi.org/10.1002/bio.4322
https://doi.org/10.1002/bio.4322
Autor:
Andon D. Lazarov, Petia Petrova
Publikováno v:
Cybernetics and Information Technologies. 22:86-95
In the present study, an extended classification of Internet users penetrating in computer networks and a definition of the motivation as a psychological and emotional state and main prerequisites for modelling of network intruder’s activity are su
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3d43d6a1beee3b805224dbc14792c89c
https://doi.org/10.2478/cait-2022-0018
https://doi.org/10.2478/cait-2022-0018
Autor:
Andon Lazarov, Petia Petrova
Publikováno v:
2022 22nd International Symposium on Electrical Apparatus and Technologies (SIELA).
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::920276307b2a87350c869050405ac6b8
https://doi.org/10.1109/siela54794.2022.9845775
https://doi.org/10.1109/siela54794.2022.9845775
Autor:
Petia Petrova
Publikováno v:
Supporting Course and Programme Leaders in Higher Education ISBN: 9781003127413
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7f7938a32e8cee4e80acdefba5aad0f4
https://doi.org/10.4324/9781003127413-11
https://doi.org/10.4324/9781003127413-11
Publikováno v:
Book of Abstracts.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::772c3228a34eb1a75ec30bebe654d0f9
https://doi.org/10.21175/rad.sum.abstr.book.2022.11.6
https://doi.org/10.21175/rad.sum.abstr.book.2022.11.6