{"title":"All-dielectric nanoantenna for efficient reflectors irradiation","authors":"A. Ospanova, L. Matekovits, A. Basharin","doi":"10.26577/phst.2020.v7.i1.04","DOIUrl":"https://doi.org/10.26577/phst.2020.v7.i1.04","url":null,"abstract":"1National University of Science and Technology (MISiS), The Laboratory of Superconducting Metamaterials and Department of Theoretical Physics and Quantum Technologies, Leninsky prospect, 4, 119049, Moscow, Russia 2Politecnico di Torino, Department of Electronics and Telecommunications, 10129, Turin, Italy 3 Institute of Electronics, Computer and Telecommunication Engineering, National Research Council of Italy, 10129 Turin, Italy 4Politehnica University Timisoara, 2, Piata Victoriei Str., Timișoara 300006, Romania 5Scientific and Technological Center of Unique Instrumentation (RAS), 15, Butlerova Str., 117342, Moscow, Russia 6Institute for Theoretical and Applied Electromagnetics, 13, Izhorskaya Str., 125412, Moscow, Russia *e-mail: alexey.basharin@misis.ru","PeriodicalId":321102,"journal":{"name":"Physical Sciences and Technology","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121480552","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}
Z. Zhanabaev, D. Turlykozhayeva, S. B. Ikramova, A. Tileu, A. Maksutova, B. Khaniyev, A. Khaniyeva
{"title":"Current and capacitance hysteresis in porous semiconductor nanofilms","authors":"Z. Zhanabaev, D. Turlykozhayeva, S. B. Ikramova, A. Tileu, A. Maksutova, B. Khaniyev, A. Khaniyeva","doi":"10.26577/phst.2020.v7.i2.06","DOIUrl":"https://doi.org/10.26577/phst.2020.v7.i2.06","url":null,"abstract":"At present, the study of complex electrophysical characteristics of semiconductor nanofilaments and nanofilms is of interest: the presence of non-monotonic oscillating characteristics with memory, areas of negative differential resistance. The aim of this work is to experimentally study both the volt-ampere and volt-farad characteristics of semiconductor nanoporous structures. The studied samples of porous silicon with the p-n structure were obtained by electrochemical etching. Single-crystal silicon with a p – n+ junction was used as the initial substrate. The NI EL VIS II+ educational platform and the Agilent E4980A instrument were used to study the electrophysical characteristics. To measure the dependence of current on voltage, as well as capacitance on voltage, Inga contacts with a thickness of 370 nm each were applied to nanoporous films. Thus, in this work, the phenomena of current switching, hysteresis behavior of current, and capacitance of porous silicon nanofilms are experimentally studied. It was found that these effects are amplified by a factor of 3-4 when the films are irradiated with an infrared laser. The results of this work can be used in the field of nanotechnology to improve memory and sensory elements. The established experimental facts can serve as a basis for constructing physical theories.","PeriodicalId":321102,"journal":{"name":"Physical Sciences and Technology","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126246484","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}
{"title":"Dark matter distribution in galaxy U11454","authors":"K. Boshkayev, T. Konysbayev","doi":"10.26577/phst.2020.v7.i2.02","DOIUrl":"https://doi.org/10.26577/phst.2020.v7.i2.02","url":null,"abstract":"In this paper the dark matter distribution in the spiral galaxy U11454 is explored using only the well -known cored density profiles in the literature such as the pseudo-isothermal, Burkert, Einasto, exponential sphere, Beta and Brownstein profiles. It is assumed that the distribution of dark matter in the considered galaxy is spherically symmetric without taking into account its complex structural components. Instead, it is assumed that dark matter possesses non-vanishing pressure. The rotation curve data of the galaxy is fitted for each profile. The model free parameters are inferred, the total dark matter mass for each profile is calculated and our results are confronted and co ntrasted with the previous outcomes. Using Bayesian Information Criterion the best fit profile among the considered ones is selected. Furthermore, the hydrostatic equilibrium equation is solved and the pressure profiles for each above mentioned density profile are constructed in the weak gravitational field regime. Combining the pressure and corresponding density profiles one gains equations of state for the dark matter in the galaxy U11454. In addition, the speed of sound is estimated in the dark matter di stribution and it is shown that its behavior is quite unusual especially for the Brownstein profile. Finally, the refracting index is calculated in order to assess gravitational lensing effects produced by the presence of dark matter and astrophysical implications of the obtained results are discussed.","PeriodicalId":321102,"journal":{"name":"Physical Sciences and Technology","volume":"131 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130116037","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}
{"title":"Inner screening corrections to the Debye interaction in hot/dense plasmas in the vicinity of the bound – free transitions","authors":"C. Deutsch, G. Naouri, N. A. Tahir","doi":"10.26577/phst.2020.v7.i1.01","DOIUrl":"https://doi.org/10.26577/phst.2020.v7.i1.01","url":null,"abstract":"Considering hot/dense plasmas strongly ionized and still retaining hydrogenic bound states (1 ≤ z ≤ 6), we focus attention on the delocalization features of ion-electron orbitals, such as wide spreading and attending of pertaining wave functions close to the free bound transition. A systematic embedding process of increasingly excited states is shown to introduce short-range corrections to the Debye potential, while highlighting blue line shifts relative to initial Debye data. D-Dependence of a ion-electron dipole bound in a Debye potential evaluated. The probability of presence r2 R2nl (r) of the electron around its bounding ion are plotted. Orbitals 1S and 2S in a 3-component hydrogen plasma with T = 8.62 eV and n e = 2.24x10 23 cm -3 are calculated. A classical – partially degenerate difference is shown. Normalized solutions to quantum – mechanical equation for partially ionized hydrogen are obtained. Also levels deeply involved in the bound-free transition, close to vanishing in the continuum are shown.","PeriodicalId":321102,"journal":{"name":"Physical Sciences and Technology","volume":"s3-33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130147953","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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