Iranian Journal of Science and Technology, Transactions A: Science最新文献_第8页

A Theoretical Approach to the Investigation of Electrostatic Plasma Waves in Laser Pulse Interaction with Hypothetical Nonuniform Quantum Electron–Positron Magnetoplasma 研究激光脉冲与假想非均匀量子电子-正电子磁等离子体相互作用中的静电等离子体波的理论方法

IF 1.4 4区综合性期刊

Iranian Journal of Science and Technology, Transactions A: Science Pub Date : 2024-09-21 DOI: 10.1007/s40995-024-01702-z

Maryam Asgharzadeh, Hossein Zahed

{"title":"A Theoretical Approach to the Investigation of Electrostatic Plasma Waves in Laser Pulse Interaction with Hypothetical Nonuniform Quantum Electron–Positron Magnetoplasma","authors":"Maryam Asgharzadeh, Hossein Zahed","doi":"10.1007/s40995-024-01702-z","DOIUrl":"10.1007/s40995-024-01702-z","url":null,"abstract":"<div><p>Electrostatic plasma waves (EPWs) in a nonuniform quantum electron–positron magnetoplasma in the presence of ponderomotive force of laser have been studied using low-frequency and WKB approximations. Effects of the initial quantities and their transverse gradients and the effect of laser ponderomotive force on the plasma waves have been investigated. We indicate that the ponderomotive force, as regards its direction, has a significant effect on the plasma waves, and their instability rate in the parallel direction, so that, increasing the magnitude of this force increases the group and phase velocities of these waves and their instability rates. Also, the parallel plasma waves have been affected directly by amounts of initial number density and streaming velocity but, their dependence on the amount of external magnetic field is only, via the ponderomotive force. Our results indicate that in the quantum state, the additional correction terms in ponderomotive force can lead to a modification in the instability rate, and the plasma waves velocities. In the perpendicular direction, the transverse gradient of the external magnetic field was the only operant factor in the propagation of the EPWs, and it causes the waves become unstable. Also, their instabilities are affected by the magnetic field, number density, and their transverse gradients.</p></div>","PeriodicalId":600,"journal":{"name":"Iranian Journal of Science and Technology, Transactions A: Science","volume":"48 6","pages":"1645 - 1651"},"PeriodicalIF":1.4,"publicationDate":"2024-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142524495","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

On Enhanced Ratio-Type Estimators Using Quantile Regression for Finite Population Mean under Robustness and Empirical Validation 基于稳健性和经验验证的有限总体均值分位数回归的增强比率型估计

IF 1.4 4区综合性期刊

Iranian Journal of Science and Technology, Transactions A: Science Pub Date : 2024-09-21 DOI: 10.1007/s40995-024-01700-1

Muhammad Zohaib, Waqas Latif, Mubeen Alam

引用次数: 0

Estimation of Probability Density Function Under Judgment Post-Stratification Sampling Using Bayesian Estimation of Bandwidth 利用贝叶斯带宽估计法估计判断后分层抽样下的概率密度函数

IF 1.4 4区综合性期刊

Iranian Journal of Science and Technology, Transactions A: Science Pub Date : 2024-09-21 DOI: 10.1007/s40995-024-01698-6

Ali Najafi Majidabadi, Nader Nematollahi

引用次数: 0

Poly (vinyl alcohol)/montmorillonite clay/poly (1-vinylpyrrolidone-co-vinyl acetate) composite films for the effective removal of methylene blue 有效去除亚甲基蓝的聚乙烯醇/蒙脱土/聚（1-乙烯基吡咯烷酮-醋酸乙烯酯）复合膜

IF 1.4 4区综合性期刊

Iranian Journal of Science and Technology, Transactions A: Science Pub Date : 2024-09-21 DOI: 10.1007/s40995-024-01718-5

Tilak Gasti, Shruti Dixit, Ravindra B. Chougale, Saraswati P. Masti

{"title":"Poly (vinyl alcohol)/montmorillonite clay/poly (1-vinylpyrrolidone-co-vinyl acetate) composite films for the effective removal of methylene blue","authors":"Tilak Gasti, Shruti Dixit, Ravindra B. Chougale, Saraswati P. Masti","doi":"10.1007/s40995-024-01718-5","DOIUrl":"10.1007/s40995-024-01718-5","url":null,"abstract":"<div><p>In this work, we employed the solvent casting process to produce novel composite films using poly (vinyl alcohol) (PVA), Na-montmorillonite (MMT), and poly (1-vinylpyrrolidone-co-vinyl acetate) (PVP-co-VAc). The objective of this work is to examine the effects of PVP-co-VAc concentration on the mechanical, optical, and surface wettability properties of PVA/MMT films. The developed films exhibited secondary interactions between the film components, as confirmed by the FT-IR analysis. The incorporation of PVP-co-VAc significantly enhanced film transparency and elasticity while reducing the tensile strength by 44.54%. The hydrophobic surface of the composite film has been converted to a hydrophilic one and has shown excellent swelling efficiency of 102.08% by the effect of PVP-co-VAc. Additionally, the produced composite film demonstrated outstanding methylene blue adsorption capacity (97.87%) within 40 min at ambient temperature. These results suggest that fabricated composite films will become a promising material for removing industrially toxic dyes from aqueous solutions.</p></div>","PeriodicalId":600,"journal":{"name":"Iranian Journal of Science and Technology, Transactions A: Science","volume":"49 2","pages":"519 - 529"},"PeriodicalIF":1.4,"publicationDate":"2024-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143583670","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

XRD Peak Profile and Inverse Pole Figure Analysis of Ceria (CeO2) Nanoparticles 氧化铈（CeO2）纳米颗粒的 XRD 峰谱和反极图分析

IF 1.4 4区综合性期刊

Iranian Journal of Science and Technology, Transactions A: Science Pub Date : 2024-09-20 DOI: 10.1007/s40995-024-01710-z

R. Vettumperumal, N. R. Dhineshbabu, Elumalai PV, Chan Choon Kit

{"title":"XRD Peak Profile and Inverse Pole Figure Analysis of Ceria (CeO2) Nanoparticles","authors":"R. Vettumperumal, N. R. Dhineshbabu, Elumalai PV, Chan Choon Kit","doi":"10.1007/s40995-024-01710-z","DOIUrl":"10.1007/s40995-024-01710-z","url":null,"abstract":"<div><p>The pursuit of identifying and enhancing a preferred grain texture has emerged as a viable approach to improve functional properties. X-ray and neutron diffraction techniques have proven to be invaluable tools for probing crystallographic textures. In this study, ceria (CeO2) nanoparticles were synthesized via the precipitation method, and their structural and morphological characteristics were investigated through X-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM) analyses. The inconsistent behavior in the long-range two theta values of CeO<sub>2</sub> is elucidated from the crystallite size and strain plot. Hence, the XRD peak profile of the CeO<sub>2</sub> nanoparticles can be assessed through the Williamson – Hall (W-H), size strain plot (SSP), and Halder – Wagner (H-W) method. Among these, The Halder – Wagner method gives better structural parameter values and it confirms the existence of compressive strain in the CeO<sub>2</sub> lattice. Plane orientation, distribution, and position of Ce and O<sub>2</sub> atoms in the CeO<sub>2</sub> lattice are confirmed from the Rietveld refinement and texture analysis using GSAS – II. The regions of highest pole densities coincide with the (111) positions from the standard stereographic projection (001) which confirms the majority of particles in CeO<sub>2</sub> nanoparticles are aligned along the (001) plane.</p></div>","PeriodicalId":600,"journal":{"name":"Iranian Journal of Science and Technology, Transactions A: Science","volume":"48 6","pages":"1653 - 1661"},"PeriodicalIF":1.4,"publicationDate":"2024-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142524494","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A Class of Fractional Order Nonlinear Volterra–Fredholm Integro-Differential IVPs and BVPs: Qualitative Analysis and Numerical Investigation 一类分数阶非线性Volterra-Fredholm积分-微分ivp和bvp：定性分析和数值研究

IF 1.4 4区综合性期刊

Iranian Journal of Science and Technology, Transactions A: Science Pub Date : 2024-09-20 DOI: 10.1007/s40995-024-01713-w

Bapan Ali Miah, Mausumi Sen, R. Murugan, Damini Gupta

{"title":"A Class of Fractional Order Nonlinear Volterra–Fredholm Integro-Differential IVPs and BVPs: Qualitative Analysis and Numerical Investigation","authors":"Bapan Ali Miah, Mausumi Sen, R. Murugan, Damini Gupta","doi":"10.1007/s40995-024-01713-w","DOIUrl":"10.1007/s40995-024-01713-w","url":null,"abstract":"<div><p>In this work, we have examined a class of fractionally ordered Volterra–Fredholm integro-differential equations (VFIDE), where the fractional derivative has been interpreted in the Riemann–Liouville sense. We have focused separate attention on the boundary value problems (BVPs) and initial value problems (IVPs). Each of these problems has been reduced to a fractional order Volterra–Fredholm integral equation of the second kind using Leibnitz’s formula to simplify the analysis. We have derived sufficient conditions for the existence and uniqueness of the solutions to the IVPs and BVPs. We have used Banach’s fixed point and Schaefer’s fixed point theorems to prove the existence and uniqueness results for the considered problems. An operator-based approach using Laplace discrete modified Adomian decomposition methods based on Bernstein polynomials has been considered to approximate their solutions. The convergence and error analysis of the proposed method has also been investigated. We have compared the method with the Homotopy perturbation method for the considered problems. Some numerical examples have been provided to validate the theoretical results.</p></div>","PeriodicalId":600,"journal":{"name":"Iranian Journal of Science and Technology, Transactions A: Science","volume":"49 1","pages":"225 - 241"},"PeriodicalIF":1.4,"publicationDate":"2024-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143108954","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

On Fermat-Type Binomial Equations Involving Differential Difference Form in Higher Dimensional Complex Plane 论涉及高维复平面差分形式的费马型二项式方程

IF 1.4 4区综合性期刊

Iranian Journal of Science and Technology, Transactions A: Science Pub Date : 2024-09-20 DOI: 10.1007/s40995-024-01716-7

Goutam Haldar, Abhijit Banerjee

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Existence of Positive Solutions of a Fractional Dynamic Equation Involving Integral Boundary Conditions on Time Scales 涉及时间尺度上积分边界条件的分数动态方程正解的存在性

IF 1.4 4区综合性期刊

Iranian Journal of Science and Technology, Transactions A: Science Pub Date : 2024-08-24 DOI: 10.1007/s40995-024-01691-z

Bikash Gogoi, Utpal Kumar Saha, Bipan Hazarika, Ravi P. Agarwal

引用次数: 0

Constrained Bayesian Methods for Union-Intersection and Intersection-Union Hypotheses Testing Problems 联合-交叉和交叉-联合假设检验问题的约束贝叶斯方法

IF 1.4 4区综合性期刊

Iranian Journal of Science and Technology, Transactions A: Science Pub Date : 2024-08-24 DOI: 10.1007/s40995-024-01693-x

K. J. Kachiashvili, A. SenGupta

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A Robust Higher-Order Scheme for Fractional Delay Differential Equations Involving Caputo Derivative 涉及卡普托导数的分式延迟微分方程的稳健高阶方案

IF 1.4 4区综合性期刊

Iranian Journal of Science and Technology, Transactions A: Science Pub Date : 2024-08-22 DOI: 10.1007/s40995-024-01695-9

Biswajit Prusty, Madhukant Sharma

引用次数: 0