Iranian Journal of Science and Technology, Transactions A: Science最新文献_第2页

An Efficient Conjugate Gradient Method Based on the Conjugacy Condition with an Application in Motion Control 基于共轭条件的高效共轭梯度法及其在运动控制中的应用

IF 1.4 4区综合性期刊

Iranian Journal of Science and Technology, Transactions A: Science Pub Date : 2025-04-08 DOI: 10.1007/s40995-025-01805-1

T. Diphofu, P. Kaelo

引用次数: 0

Dynamics and Study of Atmospheric Model Using New Modified Hermite Wavelet Collocation Method 基于改进Hermite小波配置方法的大气模型动力学研究

IF 1.4 4区综合性期刊

Iranian Journal of Science and Technology, Transactions A: Science Pub Date : 2025-04-07 DOI: 10.1007/s40995-025-01811-3

R. Yeshwanth, S. Kumbinarasaiah

{"title":"Dynamics and Study of Atmospheric Model Using New Modified Hermite Wavelet Collocation Method","authors":"R. Yeshwanth, S. Kumbinarasaiah","doi":"10.1007/s40995-025-01811-3","DOIUrl":"10.1007/s40995-025-01811-3","url":null,"abstract":"<div>Many scientific fields have emphasized studying the dynamic behavior associated with environmental occurrences. Warming of the planet is one such occurrence. The two primary drivers of global warming negatively impacting our ecosystem are temperature and excess greenhouse gases. In light of the importance of this climatic event, we have considered the three climatic variables in this study: temperature, greenhouse gas concentrations, and permafrost thawing in the form of a fractional-order atmospheric model. Using the Hermite wavelet collocation method (HWCM), the system of nonlinear ordinary differential equations of integer and fractional order is numerically solved. The atmospheric model is transformed into an algebraic equation system using the collocation approach and the fractional derivative operational matrices. The Newton–Raphson method of solving these algebraic equations entails inserting the estimated values of the generated unknown coefficients. The present method, ND solver, and RK methods are compared numerically. Furthermore, we demonstrate the method’s effectiveness in various scenarios by running simulations with fractional orders and parameter values. The results confirm the method’s capacity to produce accurate results in many contexts. Tables and graphs show how well the developed strategy performed over time and how effective it was. These results help us analyze the variation of three dependent variables by varying parameter values. The Hermite wavelet collocation method described here is accurate in terms of convergence and computational cost and robust when compared to previous methods in the literature. Mathematica is a mathematical software for numerical computations.</div>","PeriodicalId":600,"journal":{"name":"Iranian Journal of Science and Technology, Transactions A: Science","volume":"49 5","pages":"1357 - 1372"},"PeriodicalIF":1.4,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145121600","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

Bifurcation Analysis of a Discrete-Time Tumor Model with Crowley-Martin Functional Response and its Optimal Control Theory 具有Crowley-Martin函数响应的离散时间肿瘤模型的分岔分析及其最优控制理论

IF 1.4 4区综合性期刊

Iranian Journal of Science and Technology, Transactions A: Science Pub Date : 2025-04-04 DOI: 10.1007/s40995-025-01796-z

Itishree Jena, Kaushik Dehingia, Anuj Kullu, Anupam Priyadarshi

{"title":"Bifurcation Analysis of a Discrete-Time Tumor Model with Crowley-Martin Functional Response and its Optimal Control Theory","authors":"Itishree Jena, Kaushik Dehingia, Anuj Kullu, Anupam Priyadarshi","doi":"10.1007/s40995-025-01796-z","DOIUrl":"10.1007/s40995-025-01796-z","url":null,"abstract":"<div>Functional response is vital in understanding and controlling disease dynamics through mathematical modeling. This study introduces the Crowley-Martin (C-M) functional response in tumor-host cell interaction dynamics, which accounts for the handling time of healthy host cells in destroying tumor cells and the magnitude of interference among these cells. When both interference and handling time of healthy host cells in destroying tumor cells are zero, tumor cells are eradicated effectively. As these parameters increase, the system shifts to a state of coexistence. The complex dynamics of the model are explored by discretize the continuous model using Euler’s method. The local stability and bifurcation of the model for different parameter values are studied, and appropriate conditions are established. Numerical simulations validate the theoretical results of Flip and Neimark-Sacker bifurcation, revealing complex dynamical behaviors, including chaotic patterns, which suggest disease progression. Based on the chaos appearing in the bifurcation diagrams, we propose an optimal control strategy to control tumor cell growth by introducing chemotherapy drugs.</div>","PeriodicalId":600,"journal":{"name":"Iranian Journal of Science and Technology, Transactions A: Science","volume":"49 4","pages":"1125 - 1144"},"PeriodicalIF":1.4,"publicationDate":"2025-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145161605","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 Study on the Existence and Uniqueness of Random Impulsive Hilfer Pantograph Differential Equations 随机脉冲Hilfer受电弓微分方程的存在唯一性研究

IF 1.4 4区综合性期刊

Iranian Journal of Science and Technology, Transactions A: Science Pub Date : 2025-04-04 DOI: 10.1007/s40995-025-01816-y

B. Radhakrishnan, M. Tamilarasi, P. Anukokila

引用次数: 0

The Effect of Solid Particle Injection on the Transmission Rate of Radio Waves Through the Shock Produced Plasma Sheath 固体粒子注入对冲击等离子体鞘层无线电波传输速率的影响

IF 1.4 4区综合性期刊

Iranian Journal of Science and Technology, Transactions A: Science Pub Date : 2025-04-01 DOI: 10.1007/s40995-025-01808-y

Sima Alilou, Laya Shahrassai, Samad Sobhanian

引用次数: 0

UV Modulated Photoluminescence of Ce Doped ZnO Nanoparticles for Photocatalytic and White Light Emitting Diode Applications Ce掺杂ZnO纳米粒子在光催化和白光发光二极管中的紫外调制发光研究

IF 1.4 4区综合性期刊

Iranian Journal of Science and Technology, Transactions A: Science Pub Date : 2025-04-01 DOI: 10.1007/s40995-025-01809-x

N. Lavanya, N. K. Deepak

{"title":"UV Modulated Photoluminescence of Ce Doped ZnO Nanoparticles for Photocatalytic and White Light Emitting Diode Applications","authors":"N. Lavanya, N. K. Deepak","doi":"10.1007/s40995-025-01809-x","DOIUrl":"10.1007/s40995-025-01809-x","url":null,"abstract":"<div>This work investigates the effect of Ce doping in ZnO by sol–gel combustion method on its photocatalytic activity and optoelectronic application. XRD, TEM analysis confirmed the wurtzite hexagonal structure of ZnO. EDX analysis depicted the presence of Ce in addition to Zn and O. UV–Vis studies revealed a decrement in energy band gap on introduction of Ce. PL data analysis showed the existence of various defects which upgrades enhancement of visible emission via activation through diverse wavelengths. The photocatalytic activity of the synthesized nanoparticles was studied by evaluating the degradation of methylene blue (MB) under solar and methyl orange (MO) under xenon light irradiation. Zn0.99Ce0.01O showed an efficiency of 96.9% under solar irradiation compared to 41.5% using a light source for the same duration of exposure. Hence sunlight could be considered as the best light source for the elimination of dyes from the water sources in the environment. Moreover, the CIE coordinates of Zn0.97Ce0.03O were obtained to be (0.36, 0.38) with CCT of 4574 K at 325 nm which shows warm white light validating its application in household optoelectronic devices.</div>","PeriodicalId":600,"journal":{"name":"Iranian Journal of Science and Technology, Transactions A: Science","volume":"49 5","pages":"1445 - 1458"},"PeriodicalIF":1.4,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145121368","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

New Insights in the Application of Viscosity Solutions for Some Higher-Order Partial Differential Equations 一些高阶偏微分方程粘度解应用的新认识

IF 1.4 4区综合性期刊

Iranian Journal of Science and Technology, Transactions A: Science Pub Date : 2025-04-01 DOI: 10.1007/s40995-025-01807-z

S. M. E. Hosseini, S. S. Nezhad

引用次数: 0

Analysis of Edible Silver Foils Under Steady Magnetic Field by Calibration Free Laser Induced Breakdown Spectroscopy (CF-LIBS) 稳定磁场下食用银箔的校准自由激光诱导击穿光谱（CF-LIBS）分析

IF 1.4 4区综合性期刊

Iranian Journal of Science and Technology, Transactions A: Science Pub Date : 2025-03-25 DOI: 10.1007/s40995-024-01760-3

Saba Mushtaq, Khurram Siraj, Muhammad Shahzad Abdul Rahim, Qaneeta Younas, Breara Muhammad Hussain, Muhammad Qasim, Muhammad Mustafa

{"title":"Analysis of Edible Silver Foils Under Steady Magnetic Field by Calibration Free Laser Induced Breakdown Spectroscopy (CF-LIBS)","authors":"Saba Mushtaq, Khurram Siraj, Muhammad Shahzad Abdul Rahim, Qaneeta Younas, Breara Muhammad Hussain, Muhammad Qasim, Muhammad Mustafa","doi":"10.1007/s40995-024-01760-3","DOIUrl":"10.1007/s40995-024-01760-3","url":null,"abstract":"<div>The Rudimentary Analysis of Edible Silver foil has been Investigated by a Magnetic Field (B)-supported LIBS. The Silver Plasma was Produced by Employing an Nd-YAG Pulsed Laser (100 mJ,1064 nm,) on the Surface of Silver foil in the Presence of B = 0.75 T, which Analyzed the Significant Enhancement in the LIBS Sensitivity by Detecting the Essential and Toxic Elements (C, Ag, Al, Fe, Ca, Cr, Si, Mg, Na) in Silver Plasma. The Enhancement Factor is up to four-fold and Optical Emission Intensity, Plasma Parameters like Plasma Temperature (Te) and electron Number Density (ne) were Enhanced in the Presence of a Magnetic Field (B). The Signal Enhancement in Silver Plasma was Ascribed to Magnetic Confinement and an Increase in Recombination rate after Relaxing the Plasma. Moreover, the Value of Thermal beta is Estimated Analytically (βt < 1) in this Study, which Confirms the Validity of Magnetic Confinement in all Samples. The Elemental Composition was Determined by the Calibration-Free LIBS (CF-LIBS) Approach with Zero Fields and B-field. The Result Revealed that Silver Foils were Fraudulently Adulterated by 25–35% Aluminum, and 0.8–1.08% Chromium, which Eventually Accumulates in the Human body via the food Chain Leading to high Risks to Human Health</div>","PeriodicalId":600,"journal":{"name":"Iranian Journal of Science and Technology, Transactions A: Science","volume":"49 3","pages":"889 - 899"},"PeriodicalIF":1.4,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143938506","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

Sulfonated Melamine–Formaldehyde Resin as a Robust Catalyst for Biginelli Reactions: Synthesis of 3, 4-Dihydropyrimidinones 磺化三聚氰胺甲醛树脂在Biginelli反应中的催化作用：3,4 -二氢嘧啶酮的合成

IF 1.4 4区综合性期刊

Iranian Journal of Science and Technology, Transactions A: Science Pub Date : 2025-03-24 DOI: 10.1007/s40995-025-01795-0

Dariush Khalili, Fatemeh Rezaei

引用次数: 0

Subordination of Some Cubic Polynomials Associated with Convex Functions 若干与凸函数相关的三次多项式的隶属性

IF 1.4 4区综合性期刊

Iranian Journal of Science and Technology, Transactions A: Science Pub Date : 2025-03-21 DOI: 10.1007/s40995-025-01794-1

Manju Yadav, Sushma Gupta, Sukhjit Singh

{"title":"Subordination of Some Cubic Polynomials Associated with Convex Functions","authors":"Manju Yadav, Sushma Gupta, Sukhjit Singh","doi":"10.1007/s40995-025-01794-1","DOIUrl":"10.1007/s40995-025-01794-1","url":null,"abstract":"<div>Let (V_3(z,f)= (3/4)z+(3/10)a_2z^2+(1/20)a_3z^3) and (sigma _3^{(alpha )}(z,f)=z+(2/(2+alpha ))a_2z^2+(2/[(2+alpha )(1+alpha )])a_3z^3) be the cubic polynomials representing, respectively, the 3rd de la Vall(acute{e})e Poussin mean and the 3rd Ces(grave{a})ro mean of order (alpha ; (alpha ge 0)) of a normalized analytic function (f(z) = z+sum _{k=2}^{infty } a_k z^k.) If (mathscr {K}) denotes the usual class of normalized convex univalent functions in the open unit disc ({mathbb {D}}) in the complex plane centered at the origin, we demonstrate that (V_3(z,f)prec sigma _3^{(alpha )}(z,f)) in (mathbb {D}) for all (fin mathscr {K}) and for all real numbers (alpha) satisfying (3le alpha le 19). For all (alpha ge 19,) we also identify a sharp real number (multiplier) (gamma (alpha )) such that (gamma (alpha )cdot V_3(z,f)prec sigma _3^{(alpha )}(z,f)) in (mathbb {D}) for all (fin mathscr {K}.) Here ‘(prec)’ denotes subordination between two analytic functions.</div>","PeriodicalId":600,"journal":{"name":"Iranian Journal of Science and Technology, Transactions A: Science","volume":"49 4","pages":"1115 - 1123"},"PeriodicalIF":1.4,"publicationDate":"2025-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145168532","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