检索结果-南通市图书馆

On the Sanskruti Index of Circumcoronene Series of Benzenoid

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Applied Mathematics 2017年第4期8卷 520-524页

作者： Yingying Gao Mohammad Reza Farahani muhammad shoaib sardar Sohail Zafar Colleage of Pharmacy and Biological Engineering Chengdu University Chengdu China Department of Applied Mathematics of Iran University of Science and Technology (IUST) Narmak Tehran Iran Department of Mathematics University of Management and Technology (UMT) Lahore Pakistan

Let G = (V;E) be a simple connected graph. The sets of vertices and edges of G are denoted by V = V(G) and E = E(G), respectively. In such a simple molecular graph, vertices represent atoms and edges represent bonds. The Sanskruti index S(G) is a topological index was defined as where Su is the summation of degrees of all neighbors of vertex u in G. The goal of this paper is to compute the Sanskruti index for circumcoronene series of benzenoid.

关键词： Sanskruti Index Molecular Graph Circumcoronene Series of Benzenoid

Identification of Anomalous Behavioral Patterns in Crowd Scenes

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2022年第4期71卷 925-939页

作者： muhammad Asif Nauman muhammad shoaib Department of Computer Engineering University of Engineering and TechnologyLahorePakistan

Real time crowd anomaly detection and analyses has become an active and challenging area of research in computer vision since the last *** emerging need of crowd management and crowd monitoring for public safety has widen the countless paths of deep learning methodologies and ***,researchers have developed many sophisticated algorithms but still it is a challenging and tedious task to manage and monitor crowd in real *** proposed research work focuses on detection of local and global anomaly detection of *** of spatial-temporal features assist in differentiation of feature trained using Mask R-CNN with Resnet101 as a backbone architecture for feature *** data from,BIWI Walking Pedestrian dataset and the Crowds-By-Examples(CBE)dataset and Self-Generated dataset has been used for *** data deals with different situations like one set of data deals with normal situations like people walking and acting individually,in a group or in a dense *** other set of data contains images four unique anomalies like fight,accident,explosion and people behaving *** simulated results show that in terms of precision and recall,our system performs well with Self-Generated ***,our system uses an early stopping mechanism,which allows our system to outperform to make our model *** is why,on 89th epoch our system starts generating finest results.

关键词： Mask R-CNN crowd management and monitoring precision and recall

Attitude dynamics and control of spacecraft using geomagnetic Lorentz force

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2015年第1期15卷 127-144页

作者： Yehia A.Abdel-Aziz muhammad shoaib National Research Institute of Astronomy and Geophysics (NRIAG) Helwan Cairo 11721Egypt University of Hail Department of Mathematics PO BOX 2440 Kingdom of Saudi Arabia

Attitude stabilization of a charged rigid spacecraft in Low Earth Orbit using torques due to Lorentz force in pitch and roll directions is considered. A spacecraft that generates an electrostatic charge on its surface in the Earth’s magnetic field will be subject to perturbations from the Lorentz force. The Lorentz force acting on an electrostatically charged spacecraft may provide a useful thrust for controlling a spacecraft’s orientation. We assume that the spacecraft is moving in the Earth’s magnetic field in an elliptical orbit under the effects of gravitational, geomagnetic and Lorentz torques. The magnetic field of the Earth is modeled as a non-tilted dipole.A model incorporating all Lorentz torques as a function of orbital elements has been developed on the basis of electric and magnetic fields. The stability of the spacecraft orientation is investigated both analytically and numerically. The existence and stability of equilibrium positions is investigated for different values of the charge to mass ratio（α＊）. Stable orbits are identified for various values of α＊. The main parameters for stabilization of the spacecraft are α＊and the difference between the components of the moment of inertia for the spacecraft.

关键词： space vehicles atmospheric effects celestial mechanics kinematics and dynamics

Equilibria of a charged artificial satellite subject to gravitational and Lorentz torques

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2014年第7期14卷 891-902页

作者： Yehia A.Abdel-Aziz muhammad shoaib National Research Institute of Astronomy and Geophysics (NRIAG) HelwanCairo 11721Egypt University of Hail Department of MathematicsPO Box 2440Kingdom of Saudi Arabia

The attitude dynamics of a rigid artificial satellite subject to a gravity gradient and Lorentz torques in a circular orbit are considered. Lorentz torque is developed on the basis of the electrodynamic effects of the Lorentz force acting on the charged satellite＇s surface. We assume that the satellite is moving in a Low Earth Orbit in the geomagnetic field, which is considered to be a dipole. Our model of torque due to the Lorentz force is developed for an artificial satellite with a general shape, and the nonlinear differential equations of Euler are used to describe its attitude orientation. All equilibrium positions are determined and conditions for their existence are *** numerical results show that the charge q and radius ρ0of the center of charge for the satellite provide a certain type of semi-passive control for the attitude of the satellite. The technique for this kind of control would be to increase or decrease the electrostatic screening on the satellite. The results obtained confirm that the change in charge can affect the magnitude of the Lorentz torque, which can also affect control of the satellite. Moreover, the relationship between magnitude of the Lorentz torque and inclination of the orbit is investigated.

关键词： space vehicles -- atmospheric effects -- celestial mechanics -- kine-matics and dynamics

A reliable numerical analysis for stochastic gonorrhea epidemic model with treatment effect

在线全文

学校读者我要写书评

暂无评论

International Journal of Biomathematics 2019年第6期12卷 221-246页

作者： Ali Raza muhammad shoaib Arif muhammad Ualiq Department of Mathematics Stochastic Analysis and Optimization Research Group Air University PAF Complex E-9 Islamabad 44000PedralPakistan Faculty of Engineering.University of Central PunjabLahore 54000 PunjabPakistan

The phenomena of disease spread are unpredictable in nature due to random mixing of individuals in a *** is of more significance to include this randomness while modeling infectious *** epidemics including tlieir stochastic behavior could be a more realistic approach in many *** thus paper,a stochastic gon orrhea epidemic model with treatment effect has been analyzed *** solution of stochastic model is presented in comparison with its deterministic *** dynamics of the gonorrhea disease is governed by a threshold quantity Ai called basic reproductive ***.A11 shows the persistence of disease in *** standard numerical schemes like Euler *** Euler and stochastic Rurige Kutta are highly dependent on step size and do not behave well in certain scenarios.A competitive non-standard finite dif ference numerical scheme in stochastic setting is proposed,which is independent of step size and remains consistent with the corresponding deterministic model.

关键词： Gonorrhea disease stochastic differential equations stochastic numerical schemes

Advancements in Numerical Solutions:Fractal Runge-Kutta Approach to Model Time-Dependent MHD Newtonian Fluid with Rescaled Viscosity on Riga Plate

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Computer Modeling in Engineering & Sciences 2024年第11期141卷 1213-1241页

作者： muhammad shoaib Arif Kamaleldin Abodayeh Yasir Nawaz Department of Mathematics and Sciences College of Humanities and SciencesPrince Sultan UniversityRiyadh11586Saudi Arabia Department of Mathematics Air UniversityPAF Complex E-9Islamabad44000Pakistan

Fractal time-dependent issues in fluid dynamics provide a distinct difficulty in numerical analysis due to their complex characteristics,necessitating specialized computing techniques for precise and economical *** study presents an innovative computational approach to tackle these *** main focus is applying the Fractal Runge-Kutta Method to model the time-dependent magnetohydrodynamic(MHD)Newtonian fluid with rescaled viscosity flow on Riga *** efficient computational scheme is proposed for handling fractal time-dependent problems in flow *** scheme is comprised of three stages and constructed using three different time *** stability of the scheme is shown by employing the Fourier series analysis to solve scalar *** scheme’s convergence is guaranteed for a time fractal partial differential equations *** scheme is applied to the dimensionless fractal heat and mass transfer model of incompressible,unsteady,laminar,Newtonian fluid with rescaled viscosity flow over the flat and oscillatory Riga plates under the effects of space-and temperature-dependent heat *** first-order back differences discretize the continuity *** results show that skin friction local Nusselt number declines by raising the coefficient of the temperature-dependent term of heat source and Eckert *** numerical simulations provide valuable insights into fluid dynamics,explicitly highlighting the influence of the temperature-dependent coefficient of the heat source and the Eckert number on skin friction and local Nusselt number.

关键词： Fractal scheme stability convergence fractal Newtonian fluid with rescaled viscosity fluid heat generation

Aluminium and cerium co-doped ZnO nanoparticles:Facile and inexpensive synthesis and visible light photocatalytic performances

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Rare Earths 2021年第2期39卷 151-159页

作者： Irshad Ahmad muhammad shoaib Akhtar Ejaz Ahmed Mukhtar Ahmad Department of Physics Bahauddin Zakariya UniversityMultan60800Pakistan School of Computer and Communication Lanzhou University of TechnologyLanzhou 730000China

Facile combustion route synthesized Al and Ce co-doped ZnO nanoparticles photocatalysts were characterized using XRD,SEM,BET,EDS,UV-visible DRS,PL,photocurrent and EIS *** and SEM analyses identify that crystallite and particle size is reduced from 13.26 to 11.88 nm with introduction of Al and Ce into ZnO which assists inhibiting the recombination of photo generated charge *** DRS spectra indicate that optical assimilation of ZnO is significantly increased to visible region(-406 nm)and band gap reduces from 3.18 to 3.06 eV with introduction of Al and Ce *** impedance spectroscopy analysis under visible light illumination confirms the enhancement in visible light activity of Al and Ce co-doped ZnO nanoparticles as *** enhanced activity of Al and Ce co-doped ZnO photocatalyst can be ascribed to enhanced light assimilation,high surface area and efficient charge transfer *** results reveal that by incorporating precise amount of Al(~2%)and Ce(~2%)into ZnO,a highly efficient catalyst can be synthesized that have degraded almost 95%methyl orange(MO)dye in just 45 ***,the influence of various operational parameters such as solution pH,catalyst dose,dye concentration,airflow rate and light intensity on photodecomposition of MO was *** rmore,a possible mechanism for Al and Ce modified ZnO was proposed and designed photocatalysts demonstrates good stability in aqueous medium.

关键词： Nanoparticles ZnO Combustion MO decomposition PL Rare earths

Solution of Algebraic Lyapunov Equation on Positive-Definite Hermitian Matrices by Using Extended Hamiltonian Algorithm

在线全文

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2018年第2期54卷 181-195页

作者： muhammad shoaib Arif Mairaj Bibi Adnan Jhangir Department of Mathematics Air UniversityPAF ComplexE-9IslamabadPakistan Department of Mathematics Comsats Institute of Information TechnologyPark RoadChak-ShahzadIslamabadPakistan Department of Mathematics Comsats Institute of Information TechnologyWah CanttPakistan

This communique is opted to study the approximate solution of the Algebraic Lyapunov equation on the manifold of positive-definite Hermitian *** choose the geodesic distance between􀀀AHX􀀀XA and P as the cost function,and put forward the Extended Hamiltonian algorithm(EHA)and Natural gradient algorithm(NGA)for the ***,several numerical experiments give you an idea about the effectiveness of the proposed *** also show the comparison between these two algorithms EHA and *** results are provided and analyzed *** also conclude that the extended Hamiltonian algorithm has better convergence speed than the natural gradient algorithm,whereas the trajectory of the solution matrix is optimal in case of Natural gradient algorithm(NGA)as compared to Extended Hamiltonian Algorithm(EHA).The aim of this paper is to show that the Extended Hamiltonian algorithm(EHA)has superior convergence properties as compared to Natural gradient algorithm(NGA).Upto the best of author’s knowledge,no approximate solution of the Algebraic Lyapunov equation on the manifold of positive-definite Hermitian matrices is found so far in the literature.

关键词： Information geometry algebraic lyapunov equation positive-definite hermitianmatrix manifold natural gradient algorithm extended hamiltonian algorithm

Surface Plasmon Polariton Fizeaus Dragging: via Relative Rotational Sensing

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2019年第4期71卷 435-440页

作者： Bilal shoaib muhammad Haneef Humayun Khan Bakhtawar Lab of Theoretical Physics Department of Physics Hazara University Department of Physics Women UniversityMardan

A new scheme focusing on the surface plasmon polariton interferometry between the metal and dielectric interface is introduced. The phase shift is measured by using surface plasmon polariton wave, generated at the interface of metallic and dielectric media. The phase shift of SPPs is modi?ed under phase and amplitude control of complex conductivity for interferometry. The control ?elds strongly in?uence the phase shift of SPPs for detection of molecular motion. The phase shift of SPPs is further modi?ed by Plasmon polariton Fizeaus dragging effect. We measure 20%–25%fractional change in delay and their phases shift between two left and right SPPs modes. Our results may have signi?cant applications in sensor interferometer technology.

关键词： surface plasmon polariton Fizeaus dragging