Journal of the Belarusian State University. Physics最新文献_第3页

Transport properties of two-component radium – halogen dilute gas media 双组分镭-卤素稀气体介质的输运性质

Journal of the Belarusian State University. Physics Pub Date : 2022-02-08 DOI: 10.33581/2520-2243-2022-1-52-64

Darya Meniailava, Maksim B Shundalau, Yong‐Chang Han

引用次数: 0

Crystal growth and f – f transition intensities analysis of praseodymium ions in yttrium-aluminum orthoborates 准硼酸钇铝酸盐中镨离子的晶体生长和f - f跃迁强度分析

Journal of the Belarusian State University. Physics Pub Date : 2022-02-03 DOI: 10.33581/2520-2243-2022-1-4-13

M. Demesh, K. Gorbachenya, V. Kisel, E. Volkova, V. Maltsev, E. Koporulina, A. Kornienko, E. Dunina, N. Kuleshov

引用次数: 0

Determination of the parameters of two-beam laser splitting of silicate glasses using regression and neural network models 用回归和神经网络模型确定两束激光切割硅酸盐玻璃的参数

Journal of the Belarusian State University. Physics Pub Date : 2022-02-03 DOI: 10.33581/2520-2243-2022-1-35-43

Y. Nikitjuk, A. N. Serdyukov, I. Aushev

引用次数: 1

Recording the dynamic polarisation gratings in pure nematic liquid crystal 记录纯向列液晶的动态极化光栅

Journal of the Belarusian State University. Physics Pub Date : 2022-02-01 DOI: 10.33581/2520-2243-2022-1-14-19

S. Slussarenko, E. Melnikova, A. Tolstik

{"title":"Recording the dynamic polarisation gratings in pure nematic liquid crystal","authors":"S. Slussarenko, E. Melnikova, A. Tolstik","doi":"10.33581/2520-2243-2022-1-14-19","DOIUrl":"https://doi.org/10.33581/2520-2243-2022-1-14-19","url":null,"abstract":"We report on experimental realisation of polarisation dynamic gratings recording in pure nematic liquid crystal. This work is devoted to the experimental implementation of writing polarisation dynamic gratings in a pure nematic liquid crystal. The registration mechanism is based on the photorefractive effect in a cell filled with a pure nematic crystal under the action of an applied constant electric field. This phenomenon does not require the presence of photoexcited charge carriers in the liquid crystal and is explained by the extremely high anisotropy of the liquid crystal. The article provides an elementary theoretical model of this process. The dependences of the grating writing process on the spatial frequency of the interference field and the intensity of the recording beams are investigated. It was found that the spatial grating does not coincide with the interference field – the response of the medium is non-local. However, we do not associate this property with that in photorefractive crystals. In our case, a mechanism of purely geometric mismatch is more likely due to the peculiarity of the recording mechanism. One of the fundamental properties of the described processes is their independence from the wavelength of the recording radiation, which confirms the model of the recording mechanism we have chosen.","PeriodicalId":17264,"journal":{"name":"Journal of the Belarusian State University. Physics","volume":"126 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75033720","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}

引用次数: 0

Charging properties of thin gate dielectrics, obtained by the method of rapid thermal processing 用快速热加工方法获得了薄栅介质的充电特性

Journal of the Belarusian State University. Physics Pub Date : 2022-01-28 DOI: 10.33581/2520-2243-2022-1-80-87

N. Kovalchuk, Yuliya A. Marudo, A. Omelchenko, U. Pilipenka, V. Saladukha, S. Demidovich, V. Kolos, V. Anishchik, V. A. Filipenia, D. V. Shestovski

{"title":"Charging properties of thin gate dielectrics, obtained by the method of rapid thermal processing","authors":"N. Kovalchuk, Yuliya A. Marudo, A. Omelchenko, U. Pilipenka, V. Saladukha, S. Demidovich, V. Kolos, V. Anishchik, V. A. Filipenia, D. V. Shestovski","doi":"10.33581/2520-2243-2022-1-80-87","DOIUrl":"https://doi.org/10.33581/2520-2243-2022-1-80-87","url":null,"abstract":"The charge properties of thin dielectrics, obtained by rapid thermal processing (RTP), and their interfaces with silicon for MOS transistors are investigated. The production of insulator layers was carried out by a two- or three-stage RTP with photon processing regimes similar for each stage (duration – 12 s, maximum temperature – 1250 °C). After the third stage of RTP in a nitrogen atmosphere of the gate oxides, obtained by a two-stage process in oxygen atmosphere, the defects responsible for local charge centers are partially eliminated. There is also an increase in the relative value of the surface potential by an average of 100 relative units. The elimination of defects is a consequence of the rearrangement of the structure of the dielectric, its interface with silicon, and the diffusion of oxygen and silicon atoms along the interface of the insulator layer. For samples obtained by a two-stage RTP in an oxygen atmosphere and subjected to the third stage of processing in a forming gas, there is an almost complete elimination of local charge centers and an increase in the relative value of the surface potential by an average of 300 relative units. In this case, in addition to the processes occurring during the treatment of SiO2 by the RTP method in an nitrogen atmosphere, the liquidation of charge centers is a consequence of the passivation of defects by hydrogen atoms.","PeriodicalId":17264,"journal":{"name":"Journal of the Belarusian State University. Physics","volume":"70 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76055578","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}

引用次数: 0

The structure of rapidly solidified foil of Al – Bi alloys Al - Bi合金快速凝固箔的组织

Journal of the Belarusian State University. Physics Pub Date : 2022-01-28 DOI: 10.33581/2520-2243-2022-1-75-79

V. Shepelevich

引用次数: 0

Determination of the Bessel light beam cone parameter by Fourier analysis of the diametral distribution of the intensity 通过傅里叶分析确定贝塞尔光束锥参数的直径分布强度

Journal of the Belarusian State University. Physics Pub Date : 2022-01-27 DOI: 10.33581/2520-2243-2022-1-20-34

A. Ryzhevich, I. V. Balykin

{"title":"Determination of the Bessel light beam cone parameter by Fourier analysis of the diametral distribution of the intensity","authors":"A. Ryzhevich, I. V. Balykin","doi":"10.33581/2520-2243-2022-1-20-34","DOIUrl":"https://doi.org/10.33581/2520-2243-2022-1-20-34","url":null,"abstract":"Power spectral density (PSD) of the intensity distribution of an ideal Bessel light beam (BLB) expressions are obtained. It is shown that the PSD of the intensity distribution of an ideal BLB is limited and the upper boundary of the PSD is equal to the doubled cone parameter (the product of the wave number and the sine of the half angle of the cone of wave vectors), and the number of zeros in the PSD of an ideal BLB located in the interval from zero frequency to the upper boundary of the spectrum, is equal to the order of the beam. A technique is proposed for estimating the cone parameter of BLBs by analysing the PSD estimates of diametral distributions – one-dimensional intensity distributions obtained in the transverse plane of the beam along a line passing through the beam axis from transverse two-dimensional BLB intensity distributions recorded in the form of digital computer images. The influence of clipping (the end of the distribution at the boundary of the sensitive sensor), Gaussian and cosine modulations of the diametral distribution on the shape of the spectrum and, in case of clipping, the error in the cone parameter estimation using the proposed method is investigated. The technique is tested on the example of the analysis of experimental BLBs of different orders (BLBm, m = 0, 1, 2). The proposed technique can be used to assess the quality parameters of the BLB. The results of the analysis of the influence of cosine modulation on the shape of the PSD can be used to assess the magnitude of the rounding of the apex of the axicon forming the BLB for control the quality of the axicon manufacturing.","PeriodicalId":17264,"journal":{"name":"Journal of the Belarusian State University. Physics","volume":"35 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81385586","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}

引用次数: 0

Method for studying the photostability of solar cells based on organic-inorganic perovskites using a confocal spectrometer 用共聚焦光谱仪研究有机-无机钙钛矿太阳能电池光稳定性的方法

Journal of the Belarusian State University. Physics Pub Date : 2022-01-27 DOI: 10.33581/2520-2243-2022-1-88-97

N. S. Mahon, O. Korolik, A. Mazanik

{"title":"Method for studying the photostability of solar cells based on organic-inorganic perovskites using a confocal spectrometer","authors":"N. S. Mahon, O. Korolik, A. Mazanik","doi":"10.33581/2520-2243-2022-1-88-97","DOIUrl":"https://doi.org/10.33581/2520-2243-2022-1-88-97","url":null,"abstract":"A method for studying photosensitive structures using the example of studying the photodegradation and dark recovery of organic-inorganic perovskite solar cells is present. The method is based on the use of a confocal spectrometer to measure Raman spectra, photo- and electroluminescence spectra and kinetics, the kinetics of the short-circuit current and the open-circuit voltage under local exposure to monochromatic radiation. Raman spectra make it possible to establish the presence or absence of secondary phases, the formation of which is possible in photosensitive layers under the influence of light. The photoluminescence spectra enable to reveal the single-phase nature of the object under study. Mapping the intensity and position of the center of mass of the photoluminescence band in the plane of the object makes it possible to judge the spatial arrangement of the centers of non-radiative recombination of charge carriers, the distribution of the regions with the highest and lowest efficiency of the extraction of charge carriers by transport-acceptor layers and the spatial homogeneity of the chemical composition. Comparison of the electroluminescence spectra before and after light exposure allows revealing the formation of non-radiative recombination centers in the photoabsorbing layer and at interfaces with the transport layers. Analysis of the kinetics of changes in the parameters of the photoluminescence band obtained by measuring the short-circuit current and the open-circuit voltage makes it possible to establish the dominant photoinduced processes leading to a change in the intensity of the photoluminescence band.","PeriodicalId":17264,"journal":{"name":"Journal of the Belarusian State University. Physics","volume":"28 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89850993","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}

引用次数: 0

Estimation of the contribution of scattered ionising radiation to the dosimeter readings during measurements inside a low-background chamber 估计在低本底室测量期间散射电离辐射对剂量计读数的贡献

Journal of the Belarusian State University. Physics Pub Date : 2022-01-27 DOI: 10.33581/2520-2243-2022-1-98-108

Aleksei A. Zaharadniuk, R. Lukashevich

{"title":"Estimation of the contribution of scattered ionising radiation to the dosimeter readings during measurements inside a low-background chamber","authors":"Aleksei A. Zaharadniuk, R. Lukashevich","doi":"10.33581/2520-2243-2022-1-98-108","DOIUrl":"https://doi.org/10.33581/2520-2243-2022-1-98-108","url":null,"abstract":"The article evaluates the contribution of ionising gamma radiation scattered by structural materials when measuring the dose rate in a low-background chamber. The contribution of scattered radiation to the total dose rate was estimated using Monte Carlo simulations. A model of a low-background camera and a BDKG-05K dosimeter was created in the computer program Fluka. In addition, a model of a point source of 137Cs gamma radiation was placed in the low-background chamber. The fraction of scattered radiation was calculated by comparing the dosimeter readings when measuring the dose rate inside the low-background chamber with the reference model (the dosimeter model is placed together with the source in a vacuum, as a result, scattered radiation is completely absent). The calculation was carried out for two positions of the dosimeter relative to the source (30 and 100 cm). It was found that the contribution of scattered radiation to the dose rate reaches 38 % (distance from the source to the detector is 100 cm). To minimise the contribution of scattered radiation to the readings of the dosimeter, a design in the form of a collimator, inside which the source is located, was considered. Additionally, the work investigated the dependence of the dose rate formed by the scattered radiation on the design features of the collimator. It was found that the use of a collimator makes it possible to reduce the contribution of scattered radiation to 3 %. The aim of the work was to calculate the optimal design of the collimator, in which the contribution of scattered radiation to the total dose rate will be minimal. The results of the work will be used to create a prototype of a low-background camera and an optimised collimator.","PeriodicalId":17264,"journal":{"name":"Journal of the Belarusian State University. Physics","volume":"10 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75511322","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}

引用次数: 0

Hydrogen-phase naklep as a result of single isothermal hydride transformations 单等温氢化物转变的结果——氢相裸露

Journal of the Belarusian State University. Physics Pub Date : 2022-01-27 DOI: 10.33581/2520-2243-2022-1-65-74

G. I. Zhirov, M. V. Goltsova

引用次数: 0