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1. Ultraviolet cross-luminescence in ternary chlorides of alkali and alkaline-earth metals

Author

Vanecek, Vojtech, Paterek, Juraj, Kral, Robert, Kucerkova, Romana, Babin, Vladimir, Rohlicek, Jan, Cala, Roberto, Kratochwil, Nicolaus, Auffray, Etiennette, and Nikl, Martin

Subjects
Physics - Instrumentation and Detectors, Condensed Matter - Materials Science
Abstract

After the discovery of a cross-luminescence (CL) in BaF2 in 1982, a large number of CL scintillators were investigated. However, no CL scintillator superior to BaF2 has been discovered, and the research of CL scintillators has subsided. Recent technological development in medical imaging and high-energy physics created a new demand for ultra-fast scintillators further supported by the development of UV-sensitive semiconductor photodetectors. As a consequence, renewed interest in CL scintillators appeared. To satisfy the requirements of fast timing applications high photo-detection efficiency, e. i. a good spectral match between the scintillator and photodetector must be achieved. Cesium-based ternary chlorides could provide a red-shift (~1.5 eV) of CL towards the sensitive region of the photodetector (PMT or SiPM) while keeping light output and timing characteristics comparable to BaF2., Comment: 10 pages, 13 figures, 56 references

Published
2024
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2. Li$_2$MnCl$_4$ single crystal: new candidate for red-emitting neutron scintillator

Author

Vanecek, Vojtech, Kral, Robert, Krehlikova, Katerina, Kuverkova, Romana, Babin, Vladimir, Zemenova, Petra, Rohlicek, Jan, Malkova, Zuzana, Jurkovicova, Terezia, and Nikl, Martin

Subjects
Condensed Matter - Materials Science, Physics - Instrumentation and Detectors
Abstract

Novel red-emitting scintillator Li$_2$MnCl$_4$ is proposed as a candidate for thermal neutron detection. It features high Li content, low density, low effective atomic number, and emission in red-NIR region. These characteristics make it an interesting candidate for long distance neutron detection in harsh enviroments e. g. decomisioning of nuclear powerplants. The absorption spectrum is thoroughly investigated in the scope of Tanabe-Sugano diagram. Luminescence mechanism in the undoped Li$_2$MnCl$_4$ is studied in depth. Doping by Eu$^{2+}$ and Ce$^{3+}$ is introduced as a trial to improve the scintillation efficiency. We show in the Eu$^{2+}$ and Ce$^{3+}$ doped Li$_2$MnCl$_4$ that luminescence mechanism involves energy transfer from the dopants to Mn$^{2+}$, and propose the local lattice distortion around the dopant and a possible charge compensation mechanisms., Comment: 8 pages, 10 figures, 2 tables, 26 references

Published
2024

3. On the origin of the light yield enhancement in polymeric composite scintillators loaded with dense nanoparticles

Author

Villa, Irene, Monguzzi, Angelo, Lorenzi, Roberto, Orfano, Matteo, Babin, Vladimir, Hájek, František, Kuldová, Karla, Kučerková, Romana, Beitlerová, Alena, Mattei, Ilaria, Buresova, Hana, Pjatkan, Radek, Čuba, Václav, Procházková, Lenka Prouzová, and Nikl, Martin

Subjects
Physics - Instrumentation and Detectors, Condensed Matter - Materials Science
Abstract

Fast emitting polymeric scintillators are requested in advanced applications where high-speed detectors with large signal-to-noise ratio are needed. However, their low density implies a weak stopping power of high energy radiations, thus a limited light output and sensitivity. To enhance their performances, polymeric scintillators can be loaded with dense nanoparticles (NPs). We investigate the properties of a series of polymeric scintillators by means of photoluminescence and scintillation spectroscopy, comparing standard scintillators with a composite system loaded with dense hafnium dioxide (HfO2) NPs. The nanocomposite shows a scintillation yield enhancement of +100% with unchanged time response. We provide for the first time an interpretation of this effect, pointing out the local effect of NPs in the generation of emissive states upon interaction with the ionizing radiation. The obtained results indicate that coupling of fast conjugated emitters with optically inert dense NPs could allow to surpass the actual limits of pure polymeric scintillators., Comment: 14 pages, 4 figures

Published
2024

13. Selection of optimal parameters boom lifting mechanism

Author

Kardash Artem A., Rybin Vyacheslav V., Babin Vladimir V., Serebrennikov Yuri E., and Romanenko Maxim Yu.

Subjects
Environmental sciences, GE1-350
Abstract

This document describes the calculation procedure for selecting the optimal parameters of the boom lifting mechanism in agricultural machinery. A boom lifting scheme was developed. Studies have been carried out to find the optimal values of linear dimensions and angle, at which the required value of the force developed by the drive when lifting the boom with a hydraulic cylinder of the specified dimensions will be minimal. Based on the results of the study, an algorithm was developed for solving the optimization of boom lifting parameters. An expression is obtained for the objective function of optimizing the boom lifting mechanism. Algorithm for selection of optimal parameters of lifting mechanism considering weight of boom, hydraulic cylinder and rod has been developed.

Published
2024
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14. Optimization of hydraulic drive parameters of caterpillar forest loader

Author

Karnaukhov Ilia V., Babin Vladimir V., Ivanov Alexey Yu., Romanenko Maxim Yu., and Serebrennikov Yuri E.

Subjects
Environmental sciences, GE1-350
Abstract

The document discusses the methodology for calculating the optimal parameters of a tracked forest loader. Based on the data obtained, a mathematical model of the kinematics of machine drives was compiled when the cargo was released "through itself." As a result of the work, changes in the demand for force on the boom lifting hydraulic cylinder and graphs of the dependence of the forces of the hydraulic cylinders on the angles of rotation of the boom and rocker were built. Based on the results of the work, conclusions were made about the change in the moments changed by the cargo.

Published
2024
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15. Improving the efficiency of diesel filters to reduce the adverse impact of fuel on the environment

Author

Dadashov Gurban H., Babin Vladimir V., Alekseev Ivan E., Serebrennikov Yuri E., and Romanenko Maxim Yu.

Subjects
Environmental sciences, GE1-350
Abstract

This paper presents the quality requirements for the treatment of diesel fuel to reduce environmental pollution. The total operating costs of the conventional diesel treatment system are considered. The results of the dependence of the components of the costs and the total costs of cleaning diesel fuel on the quality of preliminary cleaning are summarized. A plan has been developed to minimize the cost of pre-treatment of diesel fuel.

Published
2024
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16. Improving environmental efficiency of gas purification by low-temperature treatment

Author

Babin Vladimir V., Romanenko Maxim Yu., Serebrennikov Yuri E., Chernetsov Vladimir V., and Dadashov Gurban H.

Subjects
Environmental sciences, GE1-350
Abstract

This paper discusses low-temperature gas purification to improve environmental efficiency. Modern methods of gas cooling are also considered. A mathematical model is proposed for changing the parameters of an ideal gas when flowing through an opening - a Laval nozzle. A graph of the temperature of the gas at the outlet of the Laval nozzle is plotted at a different pressure ratio at the inlet and outlet of the nozzle. The conclusion was made based on the obtained values.

Published
2024
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22. On the Origin of the Light Yield Enhancement in Polymeric Composite Scintillators Loaded with Dense Nanoparticles

Author

Villa, I, Monguzzi, A, Lorenzi, R, Orfano, M, Babin, V, Hájek, F, Kuldová, K, Kučerková, R, Beitlerová, A, Mattei, I, Buresova, H, Pjatkan, R, Čuba, V, Prouzová Procházková, L, Nikl, M, Villa, Irene, Monguzzi, Angelo, Lorenzi, Roberto, Orfano, Matteo, Babin, Vladimir, Hájek, František, Kuldová, Karla, Kučerková, Romana, Beitlerová, Alena, Mattei, Ilaria, Buresova, Hana, Pjatkan, Radek, Čuba, Václav, Prouzová Procházková, Lenka, Nikl, Martin, Villa, I, Monguzzi, A, Lorenzi, R, Orfano, M, Babin, V, Hájek, F, Kuldová, K, Kučerková, R, Beitlerová, A, Mattei, I, Buresova, H, Pjatkan, R, Čuba, V, Prouzová Procházková, L, Nikl, M, Villa, Irene, Monguzzi, Angelo, Lorenzi, Roberto, Orfano, Matteo, Babin, Vladimir, Hájek, František, Kuldová, Karla, Kučerková, Romana, Beitlerová, Alena, Mattei, Ilaria, Buresova, Hana, Pjatkan, Radek, Čuba, Václav, Prouzová Procházková, Lenka, and Nikl, Martin

Abstract

Fast emitting polymeric scintillators are requested in advanced applications where high speed detectors with a large signal-to-noise ratio are needed. However, their low density implies a weak stopping power of high energy radiation and thus a limited light output and sensitivity. To enhance their performance, polymeric scintillators can be loaded with dense nanoparticles (NPs). We investigate the properties of a series of polymeric scintillators by means of photoluminescence and scintillation spectroscopy, comparing standard scintillators with a composite system loaded with dense hafnium dioxide (HfO2) NPs. The nanocomposite shows a scintillation yield enhancement of +100% with an unchanged time response. We provide for the first time an interpretation of this effect, pointing out the local effect of NPs in the generation of emissive states upon interaction with ionizing radiation. The obtained results indicate that coupling fast conjugated emitters with optically inert dense NPs could lead to surpassing the actual limits of pure polymeric scintillators.

Published
2024

42. Changes to Material Phase and Morphology Due to High-Level Molybdenum Doping of ZnO Nanorods: Influence on Luminescence and Defects

Author

Buryi, Maksym, primary, Babin, Vladimir, additional, Neykova, Neda, additional, Wang, Yu-Min, additional, Remeš, Zdeněk, additional, Ridzoňová, Katarína, additional, Dominec, Filip, additional, Davydova, Marina, additional, Drahokoupil, Jan, additional, Chertopalov, Sergii, additional, Landová, Lucie, additional, and Pop-Georgievski, Ognen, additional

Published
2023
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43. Energy Partitioning in Multicomponent Nanoscintillators for Enhanced Localized Radiotherapy

Author

Secchi, V, Cova, F, Villa, I, Babin, V, Nikl, M, Campione, M, Monguzzi, A, Secchi, Valeria, Cova, Francesca, Villa, Irene, Babin, Vladimir, Nikl, Martin, Campione, Marcello, Monguzzi, Angelo, Secchi, V, Cova, F, Villa, I, Babin, V, Nikl, M, Campione, M, Monguzzi, A, Secchi, Valeria, Cova, Francesca, Villa, Irene, Babin, Vladimir, Nikl, Martin, Campione, Marcello, and Monguzzi, Angelo

Abstract

Multicomponent nanomaterials consisting of dense scintillating particles functionalized by or embedding optically active conjugated photosensitizers (PSs) for cytotoxic reactive oxygen species (ROS) have been proposed in the last decade as coadjuvant agents for radiotherapy of cancer. They have been designed to make scintillation-activated sensitizers for ROS production in an aqueous environment under exposure to ionizing radiations. However, a detailed understanding of the global energy partitioning process occurring during the scintillation is still missing, in particular regarding the role of the non-radiative energy transfer between the nanoscintillator and the conjugated moieties which is usually considered crucial for the activation of PSs and therefore pivotal to enhance the therapeutic effect. We investigate this mechanism in a series of PS-functionalized scintillating nanotubes where the non-radiative energy transfer yield has been tuned by control of the intermolecular distance between the nanotube and the conjugated system. The obtained results indicate that non-radiative energy transfer has a negligible effect on the ROS sensitization efficiency, thus opening the way to the development of different architectures for breakthrough radiotherapy coadjutants to be tested in clinics.

Published
2023

48. Scintillator‐oriented near‐infrared emitting Cs4SrI6:Yb2+, Sm2+ single crystals via sensitization strategy.

Author

Wen, Xuemin, Kucerkova, Romana, Babin, Vladimir, Prusa, Petr, Kotykova, Monika, Nikl, Martin, Li, Wen, Wang, Qian, Kurosawa, Shunsuke, and Wu, Yuntao

Subjects
SINGLE crystals, OPTICAL spectra, ENERGY transfer, SCINTILLATORS, RADIOLUMINESCENCE, RADIATION
Abstract

In this study, a new Cs4SrI6:Yb2+,Sm2+ near‐infrared (NIR) emitting scintillator was developed using sensitization strategy. It was found that Yb2+ sensitization significantly enhances the NIR radioluminescence (RL) of Sm2+, providing a new approach of designing highly emissive sensitized NIR scintillators. By studying the optical spectra and decay kinetics of Cs4SrI6:Yb2+,Sm2+, it was revealed that the energy transfer pathways involve both radiative and nonradiative processes. The gamma spectroscopy performance of Cs4SrI6:Yb2+,Sm2+ single crystals was studied by using the high‐quantum‐efficiency avalanche photodiode (APD) as the readout. Our results highlight the importance of using sensitization strategy of achieving NIR emitting scintillators and demonstrate the significant potential for radiation detection applications. [ABSTRACT FROM AUTHOR]

Published
2023
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