East European Journal of Physics最新文献_第8页

Effects of Radiation and Heat Dissipation on MHD Convective Flow in Presence of Heat Sink 热沉存在时辐射和散热对MHD对流的影响

East European Journal of Physics Pub Date : 2023-09-04 DOI: 10.26565/2312-4334-2023-3-53

Salma Akhtar, Keshab Borah, Shyamanta Chakraborty

{"title":"Effects of Radiation and Heat Dissipation on MHD Convective Flow in Presence of Heat Sink","authors":"Salma Akhtar, Keshab Borah, Shyamanta Chakraborty","doi":"10.26565/2312-4334-2023-3-53","DOIUrl":"https://doi.org/10.26565/2312-4334-2023-3-53","url":null,"abstract":"The paper examines heat and mass transfer in MHD convective flow across a vertical porous plate in presence of radiation, heat sink, and dissipation of heat. A strong magnetic field is applied perpendicular to the plate and directed into the fluid area. The governing non-dimensional equations are solved using MATLAB built-in bvp4c solver technique. With the use of mathematical software, the findings are computed, and the effect of the various non-dimensional parameters entering into the problem on the velocity, temperature and concentration profiles are displayed in graphical formats. It has been noted that the application of the magnetic field slows down fluid velocity. Additionally, both the thermal radiation effect and the Prandtl number are fully applicable to the fluid temperature. It is significant to notice that the heat sink dramatically reduces fluid temperature and fluid velocity. The current work is utilized in many real life applications, such as chemical engineering, industrial processes, a system may contain multiple components, each of whose concentrations varies from one point to the next in a number of different circumstances.","PeriodicalId":42569,"journal":{"name":"East European Journal of Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135496799","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

Energy Conditions and Statefinder Diagnostic of Cosmological Model with Special Law of Hubble Parameter in f(R, T) Gravity f(R, T)引力中具有哈勃参数特殊定律的宇宙学模型的能量条件和状态器诊断

East European Journal of Physics Pub Date : 2023-09-04 DOI: 10.26565/2312-4334-2023-3-03

V.R. Patil, P.A. Bolke, S.K. Waghmare, J.L. Pawde

引用次数: 0

The Effect of Multi-Wall Carbon Nanotubes Addition on the Shielding Properties Against Gamma Radiation 添加多壁碳纳米管对γ辐射屏蔽性能的影响

East European Journal of Physics Pub Date : 2023-09-04 DOI: 10.26565/2312-4334-2023-3-60

Moaz Altarawneh, Mutaz Aladailaha, Osama Al-Madanat

引用次数: 0

Effect of the Diffusion of Copper Atoms in Polycrystalline CdTe Films Doped with Pb Atoms 掺杂Pb原子的多晶CdTe膜中铜原子扩散的影响

East European Journal of Physics Pub Date : 2023-09-04 DOI: 10.26565/2312-4334-2023-3-41

Sharifa B. Utamuradova, Shakhrukh Kh. Daliev, Sultanpasha A. Muzafarova, Kakhramon M. Fayzullaev

{"title":"Effect of the Diffusion of Copper Atoms in Polycrystalline CdTe Films Doped with Pb Atoms","authors":"Sharifa B. Utamuradova, Shakhrukh Kh. Daliev, Sultanpasha A. Muzafarova, Kakhramon M. Fayzullaev","doi":"10.26565/2312-4334-2023-3-41","DOIUrl":"https://doi.org/10.26565/2312-4334-2023-3-41","url":null,"abstract":"The process of diffusion of labeled copper atoms in p-CdTe<Pb> coarse-block films with a columnar grain structure has been studied. The CdTe<Pb> film is a p-type semiconductor, where an increase in the Pb concentration in the composition of the CdTe films increases the resistivity ρ of the structure. When the Pb concentration in CdTe changes from 1018 to 5·1019 cm-3, the hole concentration decreases by more than 3 orders of magnitude at a constant operating level depth of EV + (0.4 ± 0.02) eV. This may indicate that the concentration of acceptor defects, which are formed in the films due to self-compensation upon doping with a PbCd donor, exceeds the number of the latter. Electrical measurements by the Hall method were carried out at a direct current and a temperature of 300 K. As a result, an increase in the temperature of films on a Mo-p-CdTe<Pb> substrate during annealing affects the electrical parameter of charge carrier mobility µ, it decreases significantly. X-ray diffraction analysis showed that on the diffraction patterns of samples of p-CdTe<Pb> films, all available reflections correspond to the CdTe phase and up to х = 0.08 do not contain reflections of impurity phases and have a cubic modification. Based on the results of the calculation, it was established that the low values of the diffusion coefficient of Cu atoms are due to the formation of associates of the A type , which are directly dependent on the concentration of atoms. Diffusion length Ln and lifetime τn of minority current carriers in large-block p-type cadmium telluride films, which can also be controlled by introducing lead atoms into cadmium telluride.","PeriodicalId":42569,"journal":{"name":"East European Journal of Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135498256","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

Renyi Holographic Dark Energy Model in f(R) Gravity with Hubble's IR Cut-Off Renyi全息暗能量模型在f(R)重力与哈勃红外截止

East European Journal of Physics Pub Date : 2023-09-04 DOI: 10.26565/2312-4334-2023-3-06

Kishor S. Wankhade, Alfred Shaikh, Siraj N. Khan

引用次数: 0

Nucleon-Nucleon Elastic Scattering for Motion in The Shifted Deng-Fan Potential 位移邓范势运动中的核子-核子弹性散射

East European Journal of Physics Pub Date : 2023-09-04 DOI: 10.26565/2312-4334-2023-3-66

Bidhan Khirali, S. Laha, Biswanath Swain, Ujjwal Laha

{"title":"Nucleon-Nucleon Elastic Scattering for Motion in The Shifted Deng-Fan Potential","authors":"Bidhan Khirali, S. Laha, Biswanath Swain, Ujjwal Laha","doi":"10.26565/2312-4334-2023-3-66","DOIUrl":"https://doi.org/10.26565/2312-4334-2023-3-66","url":null,"abstract":"The scattering theory's main objective is to comprehend an object by hurling something at it. One can learn details about an object by observing how it bounces off other objects. The potential that exists between the two particles is the thing that one seeks to comprehend. In time-independent approach to scattering, one assumes that the incident beam has been activated for a very long time and that the entire system is in a stationary state. For short-range local potentials, the variable phase methodology is highly useful in solving quantum mechanical scattering problems. Variable phase methodology/phase-function technique has been explicitly utilized for non-relativistic nucleon-nucleon scattering phenomenon with the fundamental central local potential term and without spin-orbit force. Working under this methodology, scattering phase shifts, total scattering cross section and Differential cross section have been investigated for a new nuclear potential model “Shifted Deng-Fan potential”. Real nucleon-nucleon scattering systems (n-p) and (p-p) have been treated for this purpose with partial waves up to l = 2 in the low and moderate energy region. For l > 0 waves, interacting repulsive barrier potential has been incorporated with the existing central part. Our results for the considered potential model show a close contest with that of the experimental data.","PeriodicalId":42569,"journal":{"name":"East European Journal of Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135498614","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

Mechanisms of Current Transition in High Compensated Silicon Samples with Zinc Nanoclusters 含锌纳米团簇的高补偿硅样品中的电流转变机制

East European Journal of Physics Pub Date : 2023-09-04 DOI: 10.26565/2312-4334-2023-3-43

Eshkuvat U. Arzikulov, M. Radzhabova, Sh.J. Quvondiqov, G. Gulyamov

{"title":"Mechanisms of Current Transition in High Compensated Silicon Samples with Zinc Nanoclusters","authors":"Eshkuvat U. Arzikulov, M. Radzhabova, Sh.J. Quvondiqov, G. Gulyamov","doi":"10.26565/2312-4334-2023-3-43","DOIUrl":"https://doi.org/10.26565/2312-4334-2023-3-43","url":null,"abstract":"This article presents experimental results on the study of the current-voltage characteristics of strongly compensated n- and p-type silicon samples diffusion-doped with zinc at a temperature of 80 K. The current-voltage characteristics of the studied samples contain both sublinear and superlinear sections. Several (up to eight) characteristic areas were found, the number of which depends on the degree of illumination, temperature, and electrical resistivity of the sample. Under certain conditions, there is an alternation of sections of the current-voltage characteristic with negative differential conductivity of the N- and S-type, behind which current instabilities with an infra-low frequency are observed. The appearance of sections of the current-voltage characteristic with a quadratic dependence is explained by the presence of fast and slow recombination centers associated with zinc nanoclusters, and sublinear sections are explained in terms of the theory of the \"injection depletion effect\". The formation of nanoclusters with the participation of zinc ions was confirmed by atomic force microscopy studies.","PeriodicalId":42569,"journal":{"name":"East European Journal of Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135496555","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

Bound State and Ro-Vibrational Energies Eigenvalues of Selected Diatomic Molecules with a Class of Inversely Quadratic Yukawa Plus Hulthén Potential Model 一类反二次Yukawa + hulthsamn势模型所选双原子分子的束缚态和反振动能特征值

East European Journal of Physics Pub Date : 2023-09-04 DOI: 10.26565/2312-4334-2023-3-12

Fina O. Faithpraise, Etido P. Inyang

引用次数: 0

Effectiveness of Wavelet Denoising on Secondary Ion Mass Spectrometry Signals 小波去噪对二次离子质谱信号的有效性研究

East European Journal of Physics Pub Date : 2023-09-04 DOI: 10.26565/2312-4334-2023-3-56

Nadia Dahraoui, M'hamed Boulakroune, S. Khelfaoui, S. Kherroubi, Yamina Benkrima

{"title":"Effectiveness of Wavelet Denoising on Secondary Ion Mass Spectrometry Signals","authors":"Nadia Dahraoui, M'hamed Boulakroune, S. Khelfaoui, S. Kherroubi, Yamina Benkrima","doi":"10.26565/2312-4334-2023-3-56","DOIUrl":"https://doi.org/10.26565/2312-4334-2023-3-56","url":null,"abstract":"Wavelet theory has already achieved huge success. For Secondary Ions Mass Spectrometry (SIMS) signals, denoising the secondary signal, which is altered by the measurement, is considered that an essential step prior to applying such a signal processing technique that aims enhance the SIMS signals.The most efficient and widely used wavelet denoising method is based on wavelet coefficient thresholding. This process involves three important steps; wavelet decomposition: the input signals are decomposed into wavelet coefficients, thresholding: the wavelet coefficients are modified according to a threshold, and reconstruction: the modified coefficients are used in an inverse transform to obtain the noise-free-signal. Several researchers have used thresholding wavelet denoising techniques. The choice of wavelet type and the level of resolution can have a significant influence; it is important to note that the choice of resolution level depends on the type of signal we are dealing with, the nature of the present noise, and our specific goals for the denoised signal. It is generally recommended to test different resolution levels and evaluate their impact on the quality of the denoised signal before making a final decision. Moreover, the results obtained in wavelet denoising can be significantly influenced by the selection of wavelet types. The chosen wavelet type plays a crucial role in the extraction of signal details. Indeed, the effectiveness of denoising the MD6 sample has been demonstrated by the results obtained with sym4, db8, Haar and coif5 wavelets? These wavelets have effectively reduced noise while preserving crucial signal information, leading to an enhancement in the quality of the denoised signal.","PeriodicalId":42569,"journal":{"name":"East European Journal of Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135496563","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 Effect of the Proton and Neutron as Probe for the Nuclear Fusion Reactions at Near-Barrier Energies 质子和中子作为探测器对近势垒能核聚变反应的影响

East European Journal of Physics Pub Date : 2023-09-04 DOI: 10.26565/2312-4334-2023-3-14

M. A. Khuadher, F.A. Majeed

引用次数: 0