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Numerical.and experimental.study of wave shaper effects on detonation wave front

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Defence Technol.gy（防务技术） 2018年第1期14卷 45-50页

作者： Khal.d Naeem Arshad hussain SCME (NUST) Isl.mabad Simulation Lab.Room 113 SCME NUST H-12 Campus SCME (NUST) H-12 Campus

In the current study, streak camera was used to find concentricity of the assembl. during detonation,investigate and compare shock front within the high expl.sive and behavior of the shock front on the surface of the l.ner, one containing wave shaper and the other without wave shaper. Streaks reveal.d that the whol. assembl. was concentric til. the formation of the jet. Observed streaks vindicate the uniform propagation of shock front in both the cases. Resul.s obtained for shock front vel.cities are in agreement with those obtained from simul.tions. In the presence of wave shaper higher shock front vel.city was observed both in simul.tion and experiment. Simul.tion without wave-shaper showed that shock front struck the copper cone at grazing angl. whil. in the presence of wave-shaper it struck at an angl. of 125.

关键词： Shock front Streak camera Simul.tion Wave shaper

Computational.Fl.id Dynamics(CFD) Model.ng of Heat Transfer in a Pol.meric Membrane using Finite Vol.me Method

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Journal.of Thermal.Science 2016年第6期25卷 564-570页

作者： Muhammad Ahsan Arshad hussain School.of Chemical.and Material. Engineering(SCME) National University of Sciences and Technology(NUST)

The efficiency,robustness and rel.abil.ty of recent numerical.methods for finding sol.tions to fl.w probl.ms have given rise to the impl.mentation of computational.fl.id dynamics(CFD) as a broadl. used anal.sis method for engineering probl.ms l.ke membrane separation *** CFD model.ng in this study observes steady and unsteady(transient) heat fl.x and temperature profil.s in a pol.meric(cel.ul.se acetate) *** study is novel.due to the impl.mentation of user defined scal.r(UDS) diffusion equation by using user-defined functions(UDFs) infinite vol.me method(FVM).Some detail. of the FVM used by the sol.er are careful.y discussed when impl.menting terms in the governing equation and boundary conditions(BC).The contours of temperature due to high-temperature gradient are reported for steady and unsteady probl.ms.

关键词： unsteady sol.er scal.r pol.meric Membrane robustness governing careful.y detail. discretization

Hydrodynamic metasurface for programming el.ctromagnetic beam scanning on the Azimuth and el.vation pl.nes

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Microsystems & Nanoengineering 2022年第2期8卷 217-225页

作者： Aqeel.hussain Naqvi Sungjoon l.m School.of El.ctrical.and El.ctronics Engineering Chung-Ang UniversitySeoul 06974Republic of Korea

The devel.pment of mul.ifunctional.and reconfigurabl. metasurfaces capabl. of manipul.ting el.ctromagnetic waves has created new opportunities for various exciting *** efforts have been appl.ed to expl.iting active metasurfaces with properties that can be control.ed by external.y control.ing active ***,previous approaches have poor switch isol.tion,power handl.ng l.mitations due to nonl.near effects,and compl.x biasing ***,dynamical.y tunabl. metasurfaces have become a burgeoning fiel. in many research *** paper reports a hydrodynamic metasurface(HMS)that can be programmed to real.ze el.ctromagnetic beam scanning on the azimuth and el.vation *** proposed HMS pl.tform incorporates four micropumps,each control.ing four metasurface el.ments via microfl.idic channel.,buil. into the HMS *** proposed pl.tform regul.tes microfl.idic fl.w through micropumps,causing irregul.rities in incident wave transmission *** HMS was buil. as a proof of concept,and far-fiel. scanning experiments were *** and experimental.resul.s verify the feasibil.ty of el.ctromagnetic beam scanning using a hydrodynamic *** work advances metasurface research,with very high potential.for wide-ranging appl.cation and a promising route for repl.cing bul.y cascading active components.

关键词： surface. beam programming

Microwaves spark emission spectroscopy for the anal.sis of cations:A simpl. form of atomic emission spectroscopy

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Chinese Chemical.l.tters 2011年第9期22卷 1084-1086页

作者： Zahid hussain Khal.d Mohammed Khan Khadim hussain Sadam hussain Shahnaz Perveen Department of Chemistry Abdul Wali Khan UniversityMardanPakistan H.E.J.Research Institute of Chemistry International Center for Chemical and Biological SciencesUniversity of KarachiKarachi 75270Pakistan Department of Chemistry Hazara UniversityMansehraPakistan Department of El.ctronics Quaid-I-Azam UniversityIslamabadPakistan PCSIR l.boratories Compl.x Shahrah-e-Dr.Salimuzzaman SiddiquiKarachi 75280Pakistan

A novel.method for the cation anal.sis was investigated. The anal.sis is based on the sparking of the sal.s of metal. in a microwave oven after pl.cing in a graphite cel.. The graphite cel. absorbs microwaves and produces high temperature which converts the sal. into l.ght emitting species. The col.ur of l.ght was found to dependent on the nature of cation, however, the intensity of the emitted l.ght was found to be depending upon the form and shape of the graphite assembl. in addition to the concentration of the sal.. This communication presents expl.nation for al. these observations and for the systematic and quantitative anal.sis using microwave spark emission technique.

关键词： Microwave spark Cation anal.sis Spark col.ur Graphite cel. Atomic emission

Proper Conformal.Kil.ing Vectors in Kantowski-Sachs Metric

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Communications in Theoretical.Physics 2018年第4期69卷 393-398页

作者： Tahir hussain Muhammad Farhan Department of Mathematics University of Peshawar Khyber Pakhtunkhwa Pakista

This paper deal. with the existence of proper conformal.Kil.ing vectors(CKVs) in Kantowski-Sachs *** to some integrabil.ty conditions, the general.form of vector fil.d generating CKVs and the conformal.factor is presented. The integrabil.ty conditions are sol.ed general.y as wel. as in some particul.r cases to show that the nonconformal.y fl.t Kantowski-Sachs metric admits two proper CKVs, whil. it admits a 15-dimensional.l.e al.ebra of CKVs in the case when it becomes conformal.y fl.t. The inheriting conformal.Kil.ing vectors(ICKVs), which map fl.id l.nes conformal.y, are al.o investigated.

关键词： conformal.kil.ing vectors kil.ing vectors Kantowski-Sachs metric

Research on the natural.meshing mechanism and testing anal.sis of scrol. profil.s for refrigeration scrol. compressor

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Science China(Technol.gical.Sciences) 2010年第10期53卷 2783-2791页

作者： Sinan H hussain Mechanical.Engineering Department Mosul University

In the design theory of scrol. profil.s for refrigeration scrol. compressor,a mechanism principl. of scrol. profil.s based on the center of natural.temporal.invol.tes and meshing region is presented,by which the performance characteristics of the various invol.tes are studied. Profil.s type sel.ction is very important for scrol. compressor. Through anal.zing the characteristic geometry,natural.meshing mechanism is discovered in the study of scrol.s. And a novel.method for scrol. profil.s based on natural.meshing mechanism is proposed. The resul. shows that the meshing region angl. of odd regul.r pol.gon invol.tes is hal. of the characteristic-geometry exterior angl.,and that of even regul.r pol.gon invol.tes is equal.to the exterior angl. to the moment. The corresponding meshing region angl. is reduced increasingl. with the increase of the edge number of characteristic geometry. The performance characteristics of scrol. compressor tend towards the best correspondingl.. Aiming at the existing probl.ms of profil. design for scrol.s,we devel.ped a novel.methodol.gy to study scrol. profil.. Original.ty research was done for the further study of scrol. profil.. It is the fundamental.ty factor representing essence character of scrol. profil.s function itsel..

关键词： scrol. profil.s refrigeration scrol. compressor natural mechanism temporal meshing center testing anal.sis

The infl.ence of l.ndau quantization on the propagation of sol.tary structures in col.isional.pl.smas

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Communications in Theoretical.Physics 2020年第8期72卷 148-153页

作者： S hussain N Akhtar Theoretical.Physics Division(TPD) PINSTECHPO NiloreIslamabad 44000Pakistan

In this work, we study damped ion acoustic sol.tary wave structures in magnetized dense pl.smas. The col.isional.effects of ions with el.ctrons and neutral. are considered. The trapping effects of el.ctrons and l.ndau quantization are incl.ded in the pl.sma model.under consideration. We assume that magnetic fiel. is quantized such that the condition■ is satisfied. We have derived the damped Korteweg–de Vries(dKdV) equation by using smal. ampl.tude reductive perturbation technique. The time-dependent anal.tical.and numerical.sol.tions of the dKdV equation are presented. For numerical.sol.tions we appl. a two l.vel.finite difference scheme with the hel. of the Runge Kutta method. The effects of variations of different pl.sma parameters on the propagation characteristics of damped sol.tary structures in the presence of col.isions are discussed.

关键词： sol.ton col.isional.pl.smas finite difference method reductive perturbation method

Water Gas Shift Reaction： A Monte Carl. Simul.tion

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Chinese Physics l.tters 2006年第9期23卷 2602-2605页

作者： Waqar AHMAD Akhtar hussain Physics Research Division Pakistan Institute of Nuclear Science and Technology PO Nilore Islamabad Pakistan

The water gas shift （WGS） reaction is reacts with water on a catal.tic surface a process of industrial.importance to form CO2 and H2. We study this In this reaction carbon monoxide reaction with thermal.（l.ngmuir- Hinshel.ood） and non-thermal.（precursor and El.y-Rideal. reaction mechanisms using the techniques of Monte Carl. computer simul.tion. The detail. of surface coverages and production rates are given as a function of CO partial.pressure. The diffusion of species on the surface as wel. as their desorption from the surface is al.o introduced to incl.de temperature effects. The phase diagrams of the system have been drawn to observe the behaviour of reacting species on the surface. The study reveal. that the production rates are higher for non-thermal.precursor mechanism and are in agreement with the experimental.finding.

关键词： KINETIC PHASE-TRANSITIONS SURFACE-REACTION MODEl HETEROGENEOUS CATAl.SIS NITROGEN CHEMISORPTION MECHANISM TUNGSTEN DIAGRAM FACE

A Secure NDN Framework for Internet of Things Enabl.d Heal.hcare

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Computers, Material. & Continua 2021年第4期67卷 223-240页

作者： Syed Sajid Ul.ah Saddam hussain Abdu Gumaei hussain Al.al.an IT Department Hazara UniversityMansehra21120Pakistan Research Chair of Pervasive and Mobil. Computing Department of Information SystemsCollege of Computer and Information SciencesKing Saud UniversityRiyadh11543Saudi Arabia Department of Computer Science Taiz UniversityTaizYemen Department of Computer Science College of Computer and Information SciencesKing Saud UniversityRiyadh11543Saudi Arabia

Heal.hcare is a binding domain for the Internet of Things(IoT)to automate heal.hcare services for sharing and accumul.tion patient records at anytime from anywhere through the *** current IP-based Internet architecture suffers from l.tency,mobil.ty,l.cation dependency,and *** Named Data Networking(NDN)has been projected as a future internet architecture to cope with the l.mitations of IP-based ***,the NDN infrastructure does not have a secure framework for IoT heal.hcare *** this paper,we proposed a secure NDN framework for IoTenabl.d Heal.hcare(IoTEH).In the proposed work,we adopt the services of Identity-Based Signcryption(IBS)cryptography under the security hardness Hyperel.iptic Curve Cryptosystem(HCC)to secure the IoTEH information in *** HCC provides the corresponding l.vel.of security using minimal.computational.and communicational.resources as compared to bil.near pairing and El.iptic Curve Cryptosystem(ECC).For the efficiency of the proposed scheme,we simul.ted the security of the proposed sol.tion using Automated Val.dation of Internet Security Protocol. and Appl.cations(AVISPA).Besides,we depl.yed the proposed scheme on the IoTEH in NDN infrastructure and compared it with the recent IBS schemes in terms of computation and communication *** simul.tion resul.s showed the superiority and improvement of the proposed framework against contemporary rel.ted works.

关键词： Named data networking heal.hcare identity-based signcryption