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The Weak Galerkin Method for Linear Hyperbolic Equation

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Communications in Computational Physics 2018年第6期24卷 152-166页

作者： Qilong Zhai Ran Zhang Nolisa Malluwawadu saqib Hussain Department of Mathematics Jilin UniversityChangchun 130012China Department of Mathematics and Statistics University of Arkansas at Little RockLittle RockArkansasUnited States

The linear hyperbolic equation is of great interest inmany branches of physics and *** this paper,we use theweak Galerkinmethod to solve the linear hyperbolic *** the weak Galerkin finite element space consists of discontinuous polynomials,the discontinuous feature of the equation can be *** optimal error estimates are *** numerical experiments are provided to verify the efficiency of the method.

关键词： Weak Galerkin finite element method linear hyperbolic equation error estimate

A Weak Galerkin Harmonic Finite Element Method for Laplace Equation

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Communications on Applied Mathematics and Computation 2021年第3期3卷 527-543页

作者： Ahmed Al-Taweel Yinlin Dong saqib Hussain Xiaoshen Wang Department of Mathematics and Statistics University of Arkansas at Little RockLittle RockAR 72204USA Department of Mathematics University of Central ArkansasConwayAR 72035USA Department of Mathematics and Physics Texas A&M International UniversityLaredoTX 78041USA

In this article,a weak Galerkin finite element method for the Laplace equation using the harmonic polynomial space is proposed and *** idea of using the P_(k)-harmonic polynomial space instead of the full polynomial space P_(k)is to use a much smaller number of basis functions to achieve the same accuracy when k≥*** optimal rate of convergence is derived in both H^(1)and L^(2)*** experiments have been conducted to verify the theoretical error *** addition,numerical comparisons of using the P_(2)-harmonic polynomial space and using the standard P_(2)polynomial space are presented.

关键词： Harmonic polynomial Weak Galerkin finite element Laplace equation

The effect of positive/negative ion on the dust grain charging process in a Vasyliunas-Cairns (VC)-distributed dusty plasma system

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Plasma Science and Technology 2019年第6期21卷 58-62页

作者： N AHMAD A A ABID Y AL-HADEETHI M N S QURESHI saqib REHMAN Department of Engineering and Applied Physics University of Science and Technology of China Hefei 230026 People's Republic of China CAS Key Laboratory of Geospace Environment Department of Geophysics and Planetary ScienceUniversity of Science and Technology of China Hefei 230026 People's Republic of China Department of Physics Faculty of Sciences King Abdulaziz Unniversity Jeddah 21589 Saudi Arabia Department of Physics GC University Lahore 54000 Pakistan Department of Chemical Physics University of Science and Technology of China Hefei 230026People's Republic of China

Charging mechanism of dust particles has been considered as a growing research area in dusty plasma physics because of its exciting *** this paper,we consider a low-temperature non-equilibrium multispecies plasma model,which consists of Vasyliunas-Caims (VC) distributed electrons,negative/positive streaming ions,and negatively-charged dust grains to explain the charging mechanism of dust *** main theme of this work is to derive expressions of currents for negatively-charged dust grains (considering an equilibrium state position) in the plasma environment comprised of electrons and positive/negative streaming ions using the VC distribution *** proposed model shows that the dust grain surface potential is significantly affected by different plasma parameters such as the negative ion streaming velocity (Sn),positive ion streaming velocity (Si),spectral indices of VC distribution,negative ion charging state (Zn),positive ion charging state (Zi),and negative ion number density (ρ).

关键词： dust grain surface potential vasyliunas-cairns power law velocity distribution function multi species plasma

A Computational Analysis to Burgers Huxley Equation

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Computers, Materials & Continua 2021年第5期67卷 2161-2183页

作者： Muhammad saqib Muhammad Shoaib Arif Shahid Hasnain Daoud S.Mashat Department of Mathematics Numl UniversityIslamabad44000Pakistan Department of Mathematics Air UniversityIslamabad44000Pakistan Department of Mathematics Air UniversityMultan CampusMultan66000Pakistan Department of Mathematics King Abdulaziz UniversityJeddahSaudi Arabia

The efficiency of solving computationally partial differential equations can be profoundly highlighted by the creation of precise,higher-order compact numerical scheme that results in truly outstanding accuracy at a given *** objective of this article is to develop a highly accurate novel algorithm for two dimensional non-linear Burgers Huxley(BH)*** proposed compact numerical scheme is found to be free of superiors approximate oscillations across discontinuities,and in a smooth ow region,it efciently obtained a high-order *** particular,two classes of higherorder compact nite difference schemes are taken into account and compared based on their computational *** stability and accuracy show that the schemes are unconditionally stable and accurate up to a two-order in time and to six-order in ***,algorithms and data tables illustrate the scheme efciency and decisiveness for solving such non-linear coupled *** is scaled in terms of L_(2) and L_(∞) norms,which validate the approximated results with the corresponding analytical *** investigation of the stability requirements of the implicit method applied in the algorithm was carried *** agreement was constructed under indistinguishable computational *** proposed methods can be implemented for real-world problems,originating in engineering and science.

关键词： Burgers Huxley equation nite difference schemes HOC schemes Thomas algorithm Von-Neumann stability ana

Research on Robust Watermarking Method of Digital Image Using SURF and DCT

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Research on Robust Watermarking Method of Digital Image Usin...

作者： Nawaz saqib Ali 海南大学

学位级别：硕士

在计算机网络技术、多媒体技术和信息技术的不断发展中,数字化已成为显示信息的主要手段。从而促进了数字多媒体信息的存储,复制和传播。在这种情况下,对数字图像,音乐等的任意编辑,复制,修改和传播没有任何限制,这会导致各种社会问题,... 详细信息

在计算机网络技术、多媒体技术和信息技术的不断发展中,数字化已成为显示信息的主要手段。从而促进了数字多媒体信息的存储,复制和传播。在这种情况下,对数字图像,音乐等的任意编辑,复制,修改和传播没有任何限制,这会导致各种社会问题,例如信息安全,版权纠纷和盗版。随着网络和多媒体的发展,数字水印技术作为一种有效的版权保护方法已受到关注。使用基于图像特征的算法来提高数字水印算法的抗几何攻击能力已受到广泛关注。水印图像的常见攻击可分为常规攻击和几何攻击。常规攻击主要包括高斯滤波,噪声攻击,图像压缩等。几何攻击主要包括旋转,缩放,平移和剪切等操作。数字水印算法的鲁棒性是重要的性能指标。当前的水印算法对几何攻击的抵抗力是一个难以解决的问题。这项研究使用水印技术,将水印信息与宿主图像的特征相关联。所研究的算法具有更好的鲁棒性,尤其是对几何攻击的抵抗力。主要研究内容如下:(1)研究了基于SURF感知哈希和DCT的鲁棒盲水印算法。该算法首先利用仿射变换与特征矩阵结合混沌加密技术对水印图像进行预处理,增强水印的机密性,对载体图像进行分块和DCT系数提取。通过修改DCT系数。完成水印的嵌入。并可以实现水印的盲提取。研究发现,SURF算法对几何攻击具有良好的鲁棒性,但是在感知哈希过程中需要优化特征模块的选择。(2)研究了基于SURF和DCT特征的鲁棒零水印算法,该算法也有助于双水印。首先,将原始图像从RGB空间转换为YUV空间,并提取亮度分量的SURF(加速鲁棒特征)。标记点,根据特征点的主要方向构造一个描述向量,实验结果表明,该算法有较好的鲁棒性。(3)研究了基于SURF和DCT和SVD的鲁棒水印算法。针对数字图像水印算法嵌入容量小,抗几何攻击性弱的问题,提出了一种基于加速鲁棒特征算法(SURF),冗余离散小波变换(RDWT)和奇异值分解(SVD)的数字水印算法。利用SURF算法的旋转不变性和平移不变性提取特征点,并对载波图像和水印图像进行RDWT和SVD变换以及逆变换,以实现水印的嵌入和提取。引入了随机采样一致性算法来优化特征点匹配结果。实验结果表明,该算法提高了嵌入水印的能力,有效提高了抗几何攻击的鲁棒性。

关键词：数字水印医学图像水印 SURF DCT

Towards Aspect Based Components Integration Framework for Cyber-Physical System

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Computers, Materials & Continua 2022年第1期70卷 653-668页

作者： Sadia Ali Yaser Hafeez Muhammad Bilal saqib Saeed Kyung Sup Kwak University Institute of Information Technology Pir Mehr Ali Shah Arid Agriculture UniversityRawalpindi46000Pakistan Department of Computer Engineering Hankuk University of Foreign StudiesYongin-si17035Korea Department of Computer Information Systems College of Computer Science and Information TechnologyImam Abdulrahman Bin Faisal UniversityP.O.Box 1982DammamSaudi Arabia Department of Information and Communication Engineering Inha UniversityIncheon22212Korea

Cyber-Physical Systems(CPS)comprise interactive computation,networking,and physical *** integrative environment of CPS enables the smart systems to be aware of the surrounding physical *** systems,such as smart health care systems,smart homes,smart transportation,and smart cities,are made up of complex and dynamic *** components integration development approach should be based on the divide and conquer *** way multiple interactive components can reduce the development complexity *** reusability enhances efficiency and consistency in CPS,encapsulation of component functionalities and a well-designed user interface is vital for the better end-user’s Quality of Experience(QoE).Thus,incorrect interaction of interfaces in the cyber-physical system causes system ***,interface failures occur due to false,and ambiguous requirements analysis and ***,to resolve this issue semantic analysis is required for different stakeholders’viewpoint analysis during requirement specification and components *** work proposes a framework to improve the CPS component integration process,starting from requirement specification to prioritization of components for *** semantic analysis and assessing the reusability of specifications,the framework uses text mining and case-based reasoning *** framework has been tested experimentally,and the results show a significant reduction in ambiguity,redundancy,and irrelevancy,as well as increasing accuracy of interface interactions,component selection,and higher user satisfaction.

关键词： Cyber-physical systems component-based development casebased reasoning prioritization requirement management specification text mining

Efficiency of KOH-modified rice straw-derived biochar for reducing cadmium mobility, bioaccessibility and bioavailability risk index in red soil

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Pedosphere 2020年第6期30卷 874-898页

作者： saqib BASHIR Qaiser HUSSAIN Jun ZHU Qingling FU David HOUBEN Hongqing HU Key Laboratory of Arable Land Conservation Middle and Lower Reaches of Yangtse RiverMinistry of AgricultureCollege of Resources and EnvironmentHuazhong Agricultural UniversityWuhan 430070China Department of Soil and Environmental Science Ghazi UniversityDera Ghazi Khan 32200Pakistan Department of Soil Science&SWC PMAS-Arid Agriculture UniversityRawalpindi 46300Pakistan AGHYLE UniLaSalleBeauvais 60011France

Cadmium(Cd)pollution in agricultural soils has exerted a serious threat due to continuous application of pesticides,fertilizers,and wastewater *** present study aimed to test the efficiency of KOH-modified and non-modified rice straw-derived biochar(KBC and BC,respectively)for reducing Cd solubility and bioavailability in Cd-contaminated ***-contaminated soil was incubated for 60 d with 15 and 30 g kg-1 BC and *** the end of incubation,Cd mobility was estimated by the European Community Bureau of Reference sequential extraction and toxicity characteristic leaching procedure(TCLP),while bioavailability was determined using 1 molL-1 NH4NO3 *** bioavailability risk index and bioaccessibility,assessed by a simple bioaccessibility extraction test,of Cd were used to examine the potential effects of Cd on living *** results indicated that application of both KBC and BC significantly increased soil p H,cation exchange capacity,nutrients,and organic *** soluble fraction of Cd was significantly decreased by 30.3%and 27.4%,respectively,with the addition of KBC and BC at 30 g kg-1 compared to the control(without biochar addition).Similarly,the bioaccessible Cd was significantly decreased by 32.4%and 25.2%,respectively,with the addition of KBC and BC at 30 g kg-1 compared to the *** addition,both KBC and BC significantly reduced Cd leaching in the TCLP and NH4NO3-extractable Cd in the amended soil compared to the *** reduction in Cd solubility and bioaccessibility by KBC and BC may be due to significant increases in soil pH and surface ***,KBC at an application rate of 30 g kg-1 demonstrated positive results as soil amendment for Cd immobilization,and reduced bioaccessible Cd in contaminated soil.

关键词： bioaccessible Cd Cd fractionation Cd immobilization NH4NO3-extractable Cd sequential extraction soilpH

Analysis of Silver Nanoparticles in Engine Oil: Atangana–Baleanu Fractional Model

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Computers, Materials & Continua 2021年第6期67卷 2915-2932页

作者： saqib Murtaza Farhad Ali Nadeem Ahmad Sheikh Ilyas Khan Kottakkaran Sooppy Nisar Department of Mathematics City University of Science and Information TechnologyPeshawar25000Pakistan Computational Analysis Research Group Ton Duc Thang UniversityHo Chi Minh City70000Vietnam Faculty of Mathematics and Statistics Ton Duc Thang UniversityHo Chi Minh City70000Vietnam Department of Mathematics College of Science Al-ZulfiMajmah UniversityAl-Majmah11952Saudi Arabia Department of Mathematics College of Arts and SciencePrince Sattam bin Abdulaziz UniversityWadi Al-Dawaser11991Saudi Arabia

The present article aims to examine the heat and mass distribution in a free convection flow of electrically conducted,generalized Jeffrey nanofluid in a heated rotatory *** flow analysis is considered in the presence of thermal radiation and the transverse magnetic field of strength *** medium is porous accepting generalized Darcy’s *** motion of the fluid is due to the cosine oscillations of the *** has been formed by the uniform dispersing of the Silver nanoparticles in regular engine *** problem has been modeled in the form of classical partial differential equations and then generalized by replacing time derivative with Atangana–Baleanu(AB)time-fractional *** taking the Laplace transform technique(LTT)and using physical boundary conditions,exact expressions have been obtained for momentum,energy,and concentration *** impact of a number of parameters on fluid flow is shown *** numerical tables have been computed for variation in the rate of heat and mass transfer with respect to rooted ***,the classical solution is recovered by taking the fractional parameter approaching *** is worth noting that by adding silver nanoparticles in regular engine oil,its heat transfer rate increased by 14.59%,which will improve the life and workability of the engine.

关键词： Jeffrey fluid silver nanoparticles engine oil Atangana-Baleanu fractional derivatives Laplace transform technique

Comparative Efficacy of Weed Control Practices for Parthenium Weed and Sunflower Crop under Varying Tillage Systems

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Phyton-International Journal of Experimental Botany 2020年第3期89卷 727-742页

作者： Noor Ahmad Rana Nadeem Abbas Asif Tanveer Zulfiqar Ahmad saqib Deaprtment of Agronomy University of Agriculture FaisalabadFaisalabad7800Pakistan Institute of Soil and Environmental Science University of Agriculture FaisalabadFaisalabad7800Pakistan

Parthenium poses serious threat to modern crop production system and necessitate evaluating control practices for its effective *** of different weed control practices for controlling parthenium was explored in conventional and deep tillage systems in the field *** hoeing(20 and 35 days after emergence),S-Metolachlor(pre-emergence herbicide),sorghum straw mulch@5 tons ha-1 and combination of hand hoeing and sorghum straw mulch(hand hoeing at 20 and straw mulch at 35 days after emergence)were used as weed control *** check where no weed control measure was applied was also included in this experiment for *** concluded that the all weed management treatments significantly reduced parthenium density,its fresh and dry biomass during both the years of study as compared to weedy *** sunflower achene yield was recorded in hand hoeing(20 and 35 days after emergence)in combination with deep ***,mold bold plough used for the purpose of deep tillage should be encouraged for better control of parthenium and higher achene yield of sunflower crop(3293.3 kg ha^(-1) in 2017 and 3221.3 kg ha^(-1) in 2018).Moreover,is also inferred that total dose of herbicide might be reduced by using hoeing and mulching in an integrated way.

关键词： Parthenium mulch hoeing tillage s-metolachlor sunflower