Vestnik moskovskogo gosudarstvennogo oblastnogo universiteta Seriia Fizikamatematika最新文献_第6页

INVESTIGATION OF PHYSICAL PROPERTIES OF carbon DIAMOND-LIKE COATINGS APPLIED BY PULSED LASER DEPOSITION 脉冲激光沉积类碳金刚石涂层的物理性能研究

Vestnik moskovskogo gosudarstvennogo oblastnogo universiteta Seriia Fizikamatematika Pub Date : 2020-01-01 DOI: 10.18384/2310-7251-2020-3-53-64

D. Nikolaeva, D. Generalov, B. A. Parshin, M. Makeev

{"title":"INVESTIGATION OF PHYSICAL PROPERTIES OF carbon DIAMOND-LIKE COATINGS APPLIED BY PULSED LASER DEPOSITION","authors":"D. Nikolaeva, D. Generalov, B. A. Parshin, M. Makeev","doi":"10.18384/2310-7251-2020-3-53-64","DOIUrl":"https://doi.org/10.18384/2310-7251-2020-3-53-64","url":null,"abstract":"Аннотация. Цель исследования – определение толщин и оптических констант углеродных алмазоподобных покрытий, нанесённых методом импульсного лазерного осаждения, для выработки рекомендаций по технологическим режимам нанесения данных покрытий на медные и алюминиевые зеркала. Процедура и методы. Для определения толщин и оптических констант углеродных алмазоподобных покрытий применяется метод ИК-спектроскопической эллипсометрии. Результаты. Определены толщины и оптические константы углеродных алмазоподобных покрытий, нанесённых на образцы медных и алюминиевых зеркал методом импульсного лазерного осаждения. Теоретическая и практическая значимость. Определены оптимальные с точки зрения оптических характеристик технологические режимы нанесения алмазоподобных покрытий методом импульсного лазерного осаждения на медные и алюминиевые подложки. Ключевые слова: углеродное алмазоподобное покрытие, эллипсометрия, упрочнение, оптические элементы, факторы космического пространства, технологические режимы, импульсное лазерное осаждение","PeriodicalId":33476,"journal":{"name":"Vestnik moskovskogo gosudarstvennogo oblastnogo universiteta Seriia Fizikamatematika","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67950069","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

MECHANICAL PROPERTIES OF SURFACE STRUCTURES OF TITANIUM ALLOY VT9 AFTER REPEATED LOCAL PROCESSING WITH NANOSECOND LASER PULSES 纳秒激光脉冲重复局部加工后钛合金vt9表面结构的力学性能

Vestnik moskovskogo gosudarstvennogo oblastnogo universiteta Seriia Fizikamatematika Pub Date : 2020-01-01 DOI: 10.18384/2310-7251-2020-2-19-35

Y. Simonov, I. Ushakov

{"title":"MECHANICAL PROPERTIES OF SURFACE STRUCTURES OF TITANIUM ALLOY VT9 AFTER REPEATED LOCAL PROCESSING WITH NANOSECOND LASER PULSES","authors":"Y. Simonov, I. Ushakov","doi":"10.18384/2310-7251-2020-2-19-35","DOIUrl":"https://doi.org/10.18384/2310-7251-2020-2-19-35","url":null,"abstract":". Purpose. The regularities of a simultaneous increase in microhardness and plastic properties of the surface of titanium alloy VT9 are investigated. The hardness and Young’s modulus of thin surface layers are determined. Methodology and Approach. The methods employed are based on the use of nanosecond laser pulses initiating a complex of physical and chemical processes. The method of continuous indentation with a maximum load of 0,05 N is used. The mechanical properties of surface structures of titanium alloy VT9 after laser treatment are analyzed. Using the load-penetration diagrams, the following values were calculated: the contact depth of penetration, the stiffness of the contact ‘indenter–material’ pair, the projection area of the unreconstructed print, and the effective Young’s modulus. On the basis of the Oliver–Pharr method, the nano- and microhardness, as well as the modulus of longitudinal elasticity of the surface layers of a titanium alloy are estimated Results . It is found that as a result of processing, the microhardness of the surface increases by 2,5–4,5 times, and the Young’s modulus by 1,1–1,5 times. A distinctive feature of the proposed treatment method is good adhesion of the surface layer with the bulk material, which reduces the probability of high mechanical stresses and cracking. Theoretical and Practical implications . The proposed method of laser processing makes it possible to form hardened surface layers in a normal atmosphere, which contributes to a significant simplification of the technological process and reduces its cost.","PeriodicalId":33476,"journal":{"name":"Vestnik moskovskogo gosudarstvennogo oblastnogo universiteta Seriia Fizikamatematika","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67950154","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: 2

GAMMA CORRECTION OF FULL COLOR OLED MICRODISPLAYS 全彩色oled微显示器的伽玛校正

Vestnik moskovskogo gosudarstvennogo oblastnogo universiteta Seriia Fizikamatematika Pub Date : 2020-01-01 DOI: 10.18384/2310-7251-2020-3-13-22

Alexandr V. Nuriev, S. A. Stakharny, N. N. Usov

{"title":"GAMMA CORRECTION OF FULL COLOR OLED MICRODISPLAYS","authors":"Alexandr V. Nuriev, S. A. Stakharny, N. N. Usov","doi":"10.18384/2310-7251-2020-3-13-22","DOIUrl":"https://doi.org/10.18384/2310-7251-2020-3-13-22","url":null,"abstract":". Aim is to study the features of gamma correction of full-color active-matrix OLED microdisplays in a wide dynamic range of brightness. Methodology . The study was carried out by calculation and experimental methods by modeling color coordinates of OLED electroluminescence at different luminance and accounts RGB color filters transmission spectra. The modeling based on experimental data obtained by measuring the electrical, photometric and spectral characteristics of OLED samples and the transmission spectra of RGB color filters. Results . Introduced base construction of full color active-matrix OLED microdisplays and method of forming color image by filter matrix. Electrical, photometrical and spectral characteristics of initial white OLED structures was represented as well as modeling of RGB color separation and factors affecting color balance of full color image. The features of full color OLED microdisplay gamma correction for different luminance level and temperatures are considered. Research implications. Researches have practical relevance for OLED microdisplays design and calibration in production stage.","PeriodicalId":33476,"journal":{"name":"Vestnik moskovskogo gosudarstvennogo oblastnogo universiteta Seriia Fizikamatematika","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67950399","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

CONDUCTIVITY OF A THIN METAL LAYER TAKING INTO ACCOUNT THE DEPENDENCE OF THE SPECULARITY COEFFICIENT ON THE ANGLE OF THE ELECTRON’S INCIDENCE ON THE SURFACE 考虑到镜面系数与电子在表面上的入射角的关系的薄金属层的电导率

Vestnik moskovskogo gosudarstvennogo oblastnogo universiteta Seriia Fizikamatematika Pub Date : 2020-01-01 DOI: 10.18384/2310-7251-2020-4-49-65

F. Karimov, A. Yushkanov

{"title":"CONDUCTIVITY OF A THIN METAL LAYER TAKING INTO ACCOUNT THE DEPENDENCE OF THE SPECULARITY COEFFICIENT ON THE ANGLE OF THE ELECTRON’S INCIDENCE ON THE SURFACE","authors":"F. Karimov, A. Yushkanov","doi":"10.18384/2310-7251-2020-4-49-65","DOIUrl":"https://doi.org/10.18384/2310-7251-2020-4-49-65","url":null,"abstract":"The aim of this work is to analyze the dependence of the electrical conductivity of a thin metal film on the nature of the dependence of the specularity coefficient on the angle of incidence of electrons on the metal surface. The dependence of the specularity coefficient on the angle of incidence is considered, satisfying the Andreev condition. Methodology . A model boundary condition is considered, taking into account the dependence of the specularity coefficient on the angle of incidence of electrons on the metal surface. Results. The considered model of the boundary conditions in the limiting cases transforms into the Fuchs boundary condition and into the Soffer boundary condition. In addition, the considered boundary condition, in contrast to the Fuchs and Soffer boundary conditions, satisfies the Andreev criterion for an almost tangential incidence of electrons on the metal surface. Research implications. The results obtained can find application in the study of the interaction of electromagnetic radiation with a thin metal film, wires, in small metal particles and in describing the skin effect in a metal.","PeriodicalId":33476,"journal":{"name":"Vestnik moskovskogo gosudarstvennogo oblastnogo universiteta Seriia Fizikamatematika","volume":"17 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79360096","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

FAST LC MODULATOR BASED ON THE WAVEGUIDE EFFECT IN A SUPER-SWING NEMATIC STRUCTURE 基于超摆向列结构波导效应的快速lc调制器

Vestnik moskovskogo gosudarstvennogo oblastnogo universiteta Seriia Fizikamatematika Pub Date : 2020-01-01 DOI: 10.18384/2310-7251-2020-3-38-52

G. Simonenko

引用次数: 0

THE ISOHERMAL PRINCIPLE OF VIRTUAL WORK FOR AN ELASTIC SOLID 弹性固体虚功的等温原理

Vestnik moskovskogo gosudarstvennogo oblastnogo universiteta Seriia Fizikamatematika Pub Date : 2020-01-01 DOI: 10.18384/2310-7251-2020-4-6-11

V. Sokolov

引用次数: 0

PRIMORDIAL BLACK HOLES, DIFFUSE GAMMA RADIATION OF THE UNIVERSE AND POSSIBLE NATURE OF DARK MATTER 原始黑洞，宇宙的漫射伽马辐射和暗物质的可能性质

Vestnik moskovskogo gosudarstvennogo oblastnogo universiteta Seriia Fizikamatematika Pub Date : 2020-01-01 DOI: 10.18384/2310-7251-2020-4-66-72

Victor M. Charugin

{"title":"PRIMORDIAL BLACK HOLES, DIFFUSE GAMMA RADIATION OF THE UNIVERSE AND POSSIBLE NATURE OF DARK MATTER","authors":"Victor M. Charugin","doi":"10.18384/2310-7251-2020-4-66-72","DOIUrl":"https://doi.org/10.18384/2310-7251-2020-4-66-72","url":null,"abstract":"The theory of evolution of the early universe predicts the formation of black holes of different mass. Depending on the physical processes, black holes can be formed with masses up to 10 27 g. Because of the Hawking effect of quantum evaporation of black holes, black holes with masses over 10 15 g have survived to our time. The aim of this work is to calculate the intensity of gamma radiation from the primordial black holes, to explain the diffuse gamma spectrum of the Universe’s radiation from them in the range of 10–100 MeV, and to estimate their contribution to dark matter of the Universe. Methodology. The intensity of radiation from an ensemble of black holes is calculated by using an approximation in the form of the δ -function for the radiation of the absolutely black body. Results . It is shown that if the function of the masses of primordial black holes is N(M) = K · M – γ , the intensity of Hawking’s radiation is I( ν ) ~ ν γ . Since the background radiation of the Universe in the range of quantum energies 10–100 MeV has the form of I( ν ) ~ ν –1,3 MeV/cm 2 MeV ⋅ ster, then N(M) = K ⋅ M 1,3 . In this range there emit primary black holes with masses of 10 15 g and sizes of an electron. Research implications. It is shown that the extrapolation of the resulting distribution of masses to the values of 5·10 21 g allows one to explain the observed mass of dark matter in the Universe. At the same time, the concentration of these black holes with masses comparable to the masses of asteroids is such that there may be hundreds of them in the solar system.","PeriodicalId":33476,"journal":{"name":"Vestnik moskovskogo gosudarstvennogo oblastnogo universiteta Seriia Fizikamatematika","volume":"7 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81799711","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

Demography, Pattern of Care, and Survival in Patients with Xanthoastrocytoma: A Systematic Review and Individual Patient Data Analysis of 325 Cases. 黄细胞瘤患者的人口统计学、护理模式和存活率：对 325 例患者的系统回顾和个体数据分析。

IF 0.8

Vestnik moskovskogo gosudarstvennogo oblastnogo universiteta Seriia Fizikamatematika Pub Date : 2019-07-01 Epub Date: 2019-10-07 DOI: 10.1055/s-0039-1697873

Supriya Mallick, Prashanth Giridhar, Rony Benson, Wineeta Melgandi, Goura Kishor Rath

{"title":"Demography, Pattern of Care, and Survival in Patients with Xanthoastrocytoma: A Systematic Review and Individual Patient Data Analysis of 325 Cases.","authors":"Supriya Mallick, Prashanth Giridhar, Rony Benson, Wineeta Melgandi, Goura Kishor Rath","doi":"10.1055/s-0039-1697873","DOIUrl":"10.1055/s-0039-1697873","url":null,"abstract":"Objectives Xanthoastrocytoma (XA) is a low-grade glial tumor seen in young adults and there is lack of robust data on treatment of this rare tumor. In this systematic review and individual patient's data analysis, we aimed to look into the demography, pattern of care, survival outcomes, and prognostic factors in patients with both Grade II and III XA. Methods A comprehensive search was conducted with the Medical Subject Heading terms: \"Xanthoastrocytoma; Pleomorphic Xanthoastrocytoma; Anaplastic Xanthoastrocytoma; Xanthoastrocytoma AND treatment; and Anaplastic Xanthoastrocytoma AND survival\" to find all possible publications. Results A total of 325 individual patients from a total of 138 publications pertaining to XA were retrieved. Median age of the entire cohort was 19 years. About 56.1% of the patients underwent a gross total resection (GTR) and 31.4% underwent a subtotal resection. Nearly, 76.6% of the patients had a Grade II tumor and adjuvant radiation was delivered in 27.4% of the patients. Estimated 2- and 5-year progression-free survival (PFS) were 68.5 and 51.2%, respectively. Age, grade, and extent of surgery were significant factors affecting PFS. Estimated 2- and 5-year overall survival (OS) was 88.8 and 78%, respectively. The median OS for Grade II and Grade III tumors were 209 and 49 months, respectively. Age and extent of surgery were significant factors affecting OS. Conclusion XA is a disease of young adults with favorable prognosis. Younger patients (<20 years), patients who undergo a GTR, and patients with a lower grade tumor have a better treatment outcome.","PeriodicalId":33476,"journal":{"name":"Vestnik moskovskogo gosudarstvennogo oblastnogo universiteta Seriia Fizikamatematika","volume":"1 1","pages":"430-437"},"PeriodicalIF":0.8,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6779544/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89966936","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

SIMULATION OF MOTION OF AN OBJECT WITH IMMUTABLE COMPLEX CONFIGURATION IN A CONFINED SPACE 具有不可变复杂构形的物体在有限空间中的运动模拟

Vestnik moskovskogo gosudarstvennogo oblastnogo universiteta Seriia Fizikamatematika Pub Date : 2019-01-01 DOI: 10.18384/2310-7251-2019-1-107-118

Eldar A. Akbarov, E. Kalashnikov

引用次数: 0

IMPROVING CHARACTERISTICS OF ZINC OXIDE TRANSPARENT ELECTRODES 改善氧化锌透明电极的性能

Vestnik moskovskogo gosudarstvennogo oblastnogo universiteta Seriia Fizikamatematika Pub Date : 2019-01-01 DOI: 10.18384/2310-7251-2019-1-74-82

A. Abduev, Abil S. Asvarov, A. K. Ahmedov, V. Belyaev, A. Y. Skvortsov, Darya S. Plentsova

引用次数: 0