International Journal of Mathematics and Physics最新文献_第7页

Calculate central limit theorem for the number of empty cells after allocation of particles 计算分配粒子后空细胞数的中心极限定理

International Journal of Mathematics and Physics Pub Date : 2021-12-19 DOI: 10.21744/ijpm.v5n1.1803

O. A. Islamova, Z. S. Chay, F. S. Rakhimova, Feruza Abdullayeva

{"title":"Calculate central limit theorem for the number of empty cells after allocation of particles","authors":"O. A. Islamova, Z. S. Chay, F. S. Rakhimova, Feruza Abdullayeva","doi":"10.21744/ijpm.v5n1.1803","DOIUrl":"https://doi.org/10.21744/ijpm.v5n1.1803","url":null,"abstract":"This work belongs to the field of limit theorems for separable statistics. In particular, this paper considers the number of empty cells after placing particles in a finite number of cells, where each particle is placed in a polynomial scheme. The statistics under consideration belong to the class of separable statistics, which were previously considered in (Mirakhmedov: 1985), where necessary statements for the layout of particles in a countable number of cells were proved. The same scheme was considered in (Asimov: 1982), in which the conditions for the asymptotic normality of random variables were established. In this paper, the asymptotic normality of the statistics in question is proved and an estimate of the remainder term in the central limit theorem is obtained. In summary, the demand for separable statistics systems is growing day by day to address large-scale databases or to facilitate user access to data management. Because such systems are not only used for data entry and storage, they also describe their structure: file collection supports logical consistency; provides data processing language; restores data after various interruptions; database management systems allow multiple users.","PeriodicalId":40756,"journal":{"name":"International Journal of Mathematics and Physics","volume":"27 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90213951","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: 1

Gas Dynamics type Burgers equation with convolutional nonlinearity 具有卷积非线性的气体动力学Burgers方程

International Journal of Mathematics and Physics Pub Date : 2021-12-01 DOI: 10.26577/ijmph.2021.v12.i2.01

D. Serikbaev

引用次数: 0

International Journal of Mathematics and Physics Pub Date : 2021-12-01 DOI: 10.26577/ijmph.2021.v12.i2.03

T. Nauryz

引用次数: 0

Motion of stars near the galactic center 星系中心附近恒星的运动

International Journal of Mathematics and Physics Pub Date : 2021-12-01 DOI: 10.26577/ijmph.2021.v12.i2.09

K. Boshkayev, T. Konysbayev, E. Kurmanov, O. Luongo, M. Muccino, H. Quevedo, A. Taukenova, A. Urazalina, G. Zhumakhanova

引用次数: 0

ZnO nanowires for photoelectric converter applications 光电变换器用ZnO纳米线

International Journal of Mathematics and Physics Pub Date : 2021-12-01 DOI: 10.26577/ijmph.2021.v12.i2.08

V. Kidalov, N. Sosnytska, A. Dyadenchuk, R. Oleksenko

{"title":"ZnO nanowires for photoelectric converter applications","authors":"V. Kidalov, N. Sosnytska, A. Dyadenchuk, R. Oleksenko","doi":"10.26577/ijmph.2021.v12.i2.08","DOIUrl":"https://doi.org/10.26577/ijmph.2021.v12.i2.08","url":null,"abstract":"This work is focused on the creation and study of photosensitive structures based on zinc oxide nanofibers, which are promising for solar energy. Zinc oxide nanowires were obtained on the porous zinc selenide surface. The porous substrate was obtained by electrochemical etching of a low-resistance n-ZnSe plate (110) with a polished surface. Nanowires were deposited by radical-beam epitaxy. The annealing temperature was varied from 400° C to 500° C. The oxygen radical flux was 1.5∙1017 cm-2s-1. The process duration was 50 minutes. According to the scanning electron microscopy results, the nanowires length reaches 10 μm, the nanowires diameter is ~1 μm. The predominant X-ray diffraction reflex at 2θ=34.44° indicates the polycrystalline nature of the manufactured ZnO coatings with a wurtzite-type hexagonal lattice. The study of nanowires ZnO luminescence at room temperature contains an ultraviolet peak around 385 nm. This peak is related to the zinc oxide edge luminescence. Based on the fabricated structure, the design of the photoconverter was developed. The upper contact of the fabricated photoelectric converter was created by vacuum thermal sputtering of aluminum through a mask. The deposition was carried out at a substrate temperature of 200° C. Ohmic contacts were made using conductive silver paste. The reverse ohmic contact was formed by applying Al paste to the entire reverse side of the surface. The upper layer of the structure is an array of ZnO nanowires. The active base layer is ZnSe. The light volt-ampere characteristics of the obtained structure were measured in the AM 1.5 illumination mode. No-load voltage Uxx, short-circuit current Isc and the fill factor of the current-voltage characteristic FF of the solar element were measured. The efficiency of the manufactured photoconverter was 13.7 %.","PeriodicalId":40756,"journal":{"name":"International Journal of Mathematics and Physics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42126158","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: 1

An Interpolated Bounce Back Thermable Method for Simulating Solid Particles Dynamics in a Viscous Medium 粘性介质中固体粒子动力学模拟的插值弹回热方法

International Journal of Mathematics and Physics Pub Date : 2021-12-01 DOI: 10.26577/ijmph.2021.v12.i2.06

D. Zhakebayev, A. Zhumali, B. Satenova

{"title":"An Interpolated Bounce Back Thermable Method for Simulating Solid Particles Dynamics in a Viscous Medium","authors":"D. Zhakebayev, A. Zhumali, B. Satenova","doi":"10.26577/ijmph.2021.v12.i2.06","DOIUrl":"https://doi.org/10.26577/ijmph.2021.v12.i2.06","url":null,"abstract":"In this paper we discuss the mathematical and computer modeling of non-isothermal two-phase flows with suspended particles. Natural convection between an outer cubical cavity and an inner hot sphere is investigated. To simulate heat fluxes loaded with particles, a thermal model of the lattice Boltzmann equation in combination with the interpolated bounce back method (TLBM-IBB) has been developed. In TLBM-IBB, IBB is used to process liquid-solid interfaces, and TLBM is used to simulate the heat flow of a fluid. The momentum exchange method is used to calculate the hydrodynamic force on the particle surface. Simulation performed for a range of Rayleigh numbers . The accuracy and efficiency of the existing method is demonstrated by the example of solving the test problem of natural convection around a stationary particle and three-dimensional compressible natural convection in a square cavity filled with air, which has a hot wall on the left and a cold wall on the right, and two horizontal walls are adiabatic. The results obtained are in good agreement with the experimental and numerical results of other authors.","PeriodicalId":40756,"journal":{"name":"International Journal of Mathematics and Physics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46812356","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

On one integrable cosmological model of the flat universe in k-essence 关于k本质中平坦宇宙的一个可积宇宙学模型

International Journal of Mathematics and Physics Pub Date : 2021-12-01 DOI: 10.26577/ijmph.2021.v12.i2.010

K. Myrzakulov, D. Kenzhalin, T. Myrzakul

引用次数: 0

Control of Vibrations of a Beam with Nonlocal Boundary Conditions 具有非局部边界条件的梁的振动控制

International Journal of Mathematics and Physics Pub Date : 2021-12-01 DOI: 10.26577/ijmph.2021.v12.i2.05

D. Nurakhmetov, S. Jumabayev, A. Aniyarov

{"title":"Control of Vibrations of a Beam with Nonlocal Boundary Conditions","authors":"D. Nurakhmetov, S. Jumabayev, A. Aniyarov","doi":"10.26577/ijmph.2021.v12.i2.05","DOIUrl":"https://doi.org/10.26577/ijmph.2021.v12.i2.05","url":null,"abstract":"In this article is considered the models of uniform Euler-Bernoulli beams with an arbitrary variable coefficient of foundation on a finite segment. The variable of foundation corresponds to the Winkler model. The control problem the first eigenvalues of the beam vibration is investigated. Two types of fastenings at the ends are considered: clamped-clamped and hinged-hinged. The control is based on the Kanguzhin algorithm through integral perturbations of one of the boundary conditions of the original problem. Conditions for the boundary parameters for controlling the first eigenvalues are found. First, a result is formulated regarding the control of the first eigenvalue of the oscillation of the Euler-Bernoulli beam with hinge fastening at both ends. The result is then extended to control with several eigenvalues for this beam, which are important from the point of view of the application. Such questions are especially relevant when studying the resonant natural frequencies of a mechanical system. A similar result was obtained for a Euler-Bernoulli beam with clamped fastening at both ends. Such results of eigenvalue control of a mechanical system contribute to the creation of various non-destructive testing devices that are widely used in technical acoustics.","PeriodicalId":40756,"journal":{"name":"International Journal of Mathematics and Physics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44557554","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

An Efficient Privacy and Integrity-Preserving Range Query Scheme over Unsorted Data in IoT Two-tiered Wireless Sensor Networks 物联网双层无线传感器网络中一种有效的基于未分类数据的隐私和完整性保护范围查询方案

International Journal of Mathematics and Physics Pub Date : 2021-12-01 DOI: 10.26577/ijmph.2021.v12.i2.04

Kimbugwe Nasser, Tingrui Pei

引用次数: 1

Static and rotating white dwarf stars at finite temperatures 静止和旋转的白矮星在有限的温度下

International Journal of Mathematics and Physics Pub Date : 2021-12-01 DOI: 10.26577/ijmph.2021.v12.i2.07

K. Boshkayev, O. Luongo, M. Muccino, H. Quevedo

引用次数: 0