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Thermodynamic Characteristics of Dusty Plasma Studied by Using Molecular Dynamics Simulation

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Plasma Science and Technology 2012年第9期14卷 771-777页

作者： aamir SHAHZAD 何茂刚 Key Laboratory of Thermo-Fluid Science and Engineering of Ministry of Education(MOE) Xi'an Jiaotong University Department of Physics Government College University Faisalabad(GCUF)Allama Iqbal RoadFaisalabad 38000Pakistan

Thermodynamic properties of a Debye-Yukawa system of particles are explored by using molecular dynamics simulation in the canonical ensemble. The excess free energy f of the Debye-Yukawa system is calculated by using two different approaches for the liquid phase, and the energy is obtained in a coupling parameter range of 0 ≤ F ≤100 and a wide range of the screening parameter κ. Simulation measurements for excess internal energy and pressure of the system over dimensionless parameters （κ, F） are also presented and compared with previous theoretical and simulated results. A F-expansion-fitting approach for the liquid phase is introduced with the expansion coefficients, which are functions of the screening parameter κ. The fitting coefficients are obtained by directly comparing them with the simulation measurements with a relative deviation of 1% or less. It is shown that the computational results provide a relatively simple method to calculate the excess internal energy and free energy in certain cases, which depend strongly on Г.

关键词： Debye-Yukawa system thermodynamic properties molecular dynamics free energy

A Buffer Management Scheme for Packet Queues in MANET

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Tsinghua Science and Technology 2013年第6期18卷 543-553页

作者： Muhammad aamir Mustafa A.Zaidi Department of Technology Support National Bank Department of Computing SZABIST

We introduce a new scheme of buffer management to handle packet queues in Mobile Ad hoc Networks （MANETs） for fixed and mobile nodes. In this scheme, we try to achieve efficient queuing in the buffer of a centrally communicating MANET node through an active queue management strategy by assigning dynamic buffer space to all neighboring nodes in proportion to the number of packets received from neighbors and hence controlling packet drop probabilities. Our simulation study reveals that the proposed scheme is a way to improve the buffer management for packet queues in MANET nodes in terms of packet loss ratio, transmission efficiency, and some other important system parameters.

关键词： Active Queue Management (AQM) Mobile Ad hoc Network (MANET) queue management packet drop

Effects of Thermal Radiation and Slip Mechanism on Mixed Convection Flow of Williamson Nanofluid Over an Inclined Stretching Cylinder

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Communications in Theoretical Physics 2019年第12期71卷 1405-1415页

作者： Masood Khan aamir Hamid Hashim Department of Mathematics Quaid-i-Azam UniversityIslamabad 44000Pakistan Department of Mathematics&Statistics Riphah International UniversityIslamabadPakistan

The current investigation highlights the mixed convection slip flow and radiative heat transport of uniformly electrically conducting Williamson nanofluid yield by an inclined circular cylinder in the presence of Brownian motion and thermophoresis parameter.A Lorentzian magnetic body force model is employed and magnetic induction effects are *** governing equations are reduced to a system of nonlinear ordinary differential equations with associated boundary conditions by applying scaling group *** reduced nonlinear ordinary differential equations are then solved numerically by Runge-Kutta-Fehlberg fifth-order method with shooting *** effects of magnetic field,Prandtl number,mixed convection parameter,buoyancy ratio parameter,Brownian motion parameter,thermophoresis parameter,heat generation/absorption parameter,mass transfer parameter,radiation parameter and Schmidt number on the skin friction coefficient and local Nusselt are analyzed and *** is found that the velocity of the fluid decreases with decrease in curvature parameter,whereas it increases with mixed convection ***,the local Nusselt number decreases with an increase in the radiation *** numerical comparison is also presented with the existing published results and found that the present results are in excellent agreement which also confirms the validity of the present methodology.

关键词： MHD Williamson nanofluid velocity and thermal slip inclined stretching cylinder heat generation/absorption

Computing of LQR Technique for Nonlinear System Using Local Approximation

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Computer Systems Science & Engineering 2023年第7期46卷 853-871页

作者： aamir Shahzad Ali Altalbe Mechanical Engineering Department The University of LahoreLahorePakistan Faculty of Computing and Information Technology King Abdulaziz UniversityJeddah80258Saudi Arabia

The main idea behind the present research is to design a state-feedback controller for an underactuated nonlinear rotary inverted pendulum module by employing the linear quadratic regulator(LQR)technique using local *** LQR is an excellent method for developing a controller for nonlinear *** provides optimal feedback to make the closed-loop system robust and stable,rejecting external ***-based optimal controller for a nonlinear system such as a rotatory inverted pendulum has not been designed and implemented using Newton-Euler,Lagrange method,and local ***,implementing LQR to an underactuated nonlinear system was vital to design a stable controller.A mathematical model has been developed for the controller design by utilizing the Newton-Euler,Lagrange *** nonlinear model has been linearized around an equilibrium *** and nonlinear models have been compared to find the range in which linear and nonlinear models’behaviour is *** LQR function and system dynamics have been used to estimate the controller *** the performance evaluation of the designed controller,Simulink has been *** and nonlinear models have been simulated along with the designed *** have been performed for the designed controller over the linear and nonlinear system under different conditions through varying system *** results show that the system is stable and robust enough to act against external *** controller maintains the rotary inverted pendulum in an upright position and rejects disruptions like falling under gravitational force or any external disturbance by adjusting the rotation of the horizontal link in both linear and nonlinear environments in a specific *** controller has been practically designed and *** is vivid from the results that the controller is robust enough to reject the disturbances in milliseconds and keeps the pendulum

关键词： Computing rotary inverted pendulum(RIP) modeling and simulation linear quadratic regulator(LQR) nonlinear system

Transradial approach for coronary procedures in the elderly population

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Journal of Geriatric Cardiology 2016年第9期13卷 798-806页

作者： Shamsi aamir Shah Mohammed Rathore Sudhir Department of Cardiology Frimley Health NHS Foundation Trust Camberley Surrey UK

Transradial cardiac catheterisation has been reported to be more beneficial compared to other approaches with easier and safer post-procedural haemostasis, better patient comfort, earlier ambulation and possibility of performing procedure and discharge on the same day. There is only limited data examining transradial access in the elderly population. In this review we looked at the available literature to give an insight into how the transradial approach compared to the transfemoral and other approaches in the elderly population. Elderly population is at higher risk of vascular access site bleeding and the transradial approach has shown equal efficacy to transfemoral approach. However, transradial approach significantly reduces vascular complications, hospital stay, mobilization times and adverse cardiac events. Therefore, transradial approach should be considered as the preferred vascular access site in the elderly population.

关键词： Percutaneous coronary intervention The elderly Transradial cardiac catheterisation

Optimal Site and Size of Distributed Generation Allocation in Radial Distribution Network Using Multi-objective Optimization

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Journal of Modern Power Systems and Clean Energy 2021年第2期9卷 404-415页

作者： aamir Ali M.U.Keerio J.A.Laghari the Department of Electrical Engineering Quaid-E-Awam University of Engineering Science and TechnologyNawabshahPakistan

Distributed generation(DG)allocation in the distribution network is generally a multi-objective optimization *** maximum benefits of DG injection in the distribution system highly depend on the selection of an appropriate number of DGs and their capacity along with the best *** this paper,the improved decomposition based evolutionary algorithm(I-DBEA)is used for the selection of optimal number,capacity and site of DG in order to minimize real power losses and voltage deviation,and to maximize the voltage stability *** proposed I-DBEA technique has the ability to incorporate non-linear,nonconvex and mixed-integer variable problems and it is independent of local extrema *** order to validate the effectiveness of the proposed technique,IEEE 33-bus,69-bus,and 119-bus standard radial distribution networks are ***,the choice of optimal number of DGs in the distribution system is also *** simulation results of the proposed method are compared with the existing *** comparison shows that the proposed method has the ability to get the multi-objective optimization of different conflicting objective functions with global optimal values along with the smallest size of DG.

关键词： Distribution system distributed generation multi-objective optimization active power loss improved decomposition based evolutionary algorithm(I-DBEA)

Fingerprint matching,spoof and liveness detection:classification and literature review

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Frontiers of Computer Science 2021年第1期15卷 179-196页

作者： Syed Farooq ALI Muhammad aamir KHAN Ahmed Sohail ASLAM Department of Software Engineering University of Management and TechnologyLahore 54770Pakistan Department of Informatics and Systems University of Management and TechnologyLahore 54770Pakistan Department of Computer Science University of Management and TechnologyLahore 54770Pakistan

Fingerprint matching,spoof mitigation and liveness detection are the trendiest biometric techniques,mostly because of their stability through life,uniqueness and their least risk of *** recent decade,several techniques are presented to address these challenges over well-known *** study provides a comprehensive review on the fingerprint algorithms and techniques which have been published in the last few *** divides the research on fingerprint into nine different approaches including feature based,fuzzy logic,holistic,image enhancement,latent,conventional machine learning,deep learning,template matching and miscellaneous *** these,deep learning approach has outperformed other approaches and gained significant attention for future *** reviewing fingerprint literature,it is historically divided into four eras based on 106 referred papers and their cumulative citations.

关键词： computer society template matching fingerprint recognition survey deep learning machine learning

Structured condition numbers and statistical condition estimation for the LDU factorization

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Applied Mathematics(A Journal of Chinese Universities) 2020年第3期35卷 332-348页

作者： Mahvish Samar aamir Farooq MU Chun-lai College of Mathematics and Statistics Chongqing UniversityChongqing 401331China

In this article, we consider the structured condition numbers for LDU, factorization by using the modified matrix-vector approach and the differential calculus, which can be represented by sets of parameters. By setting the specific norms and weight parameters, we present the expressions of the structured normwise, mixed, componentwise condition numbers and the corresponding results for unstructured ones. In addition, we investigate the statistical estimation of condition numbers of LDU factorization using the probabilistic spectral norm estimator and the small-sample statistical condition estimation method, and devise three algorithms. Finally, we compare the structured condition numbers with the corresponding unstructured ones in numerical experiments.

关键词： LDU factorization Structured condition number Normwise condition number Mixed condition number Componentwise condition number

Decolorization of Blue CL-BR dye by AOPs using bleach wastewater as source of H_2O_2

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Journal of Environmental Sciences 2007年第10期19卷 1183-1188页

作者： Abdullah Yasar Nasir Ahmad aamir Amanat Ali Khan Anwer Yousaf Directorate of Research and Development University of the PunjabLahore-Pakistan41-Kamran BlockAUama lqbal TownLahore-Pakistan.

This research was focused on the investigation of the efficacy of advanced oxidation processes （Fenton, ozonation and UV/H2O2） for decolorization of reactive azo dye （Blue CL-BR） using bleach wastewater as possible source of H2O2. All the experiments were performed on the laboratory scale set-up. The results showed that colour removal efficiencies by UV or bleach （H2O2） alone were not so efficient. Fenton process with bleach wastewater was found to be the most effective at process conditions such as pH of 3 and HEO2/Fe^2＋ ratio of 24：1, resulting in 64% colour removal. Almost complete colour removal, i.e., 99% and 95% were achieved by UV//H2O2 and UV/bleach wastewater in 30 and 60 min, respectively. Ozonation proved an efficient method for decolorization of Blue CL-BR dye at alkaline pH. It was possible to achieve 98% colour removal with 30 min of ozonation at pH 9. The colour removal of dye was found to follow first order kinetics.

关键词： azo dye bleach wastewater Fenton hydrogen peroxide ozone