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Quantitative analysis of saindha salt using laser induced breakdown spectroscopy and cross-validation with ICP-m.

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Plasm. Science and Technology 2020年第7期22卷 51-58页

作者： m.QASIm.m.anwar-UL-HAQ m.SHER AFGAN S U HAQ m.A baig Departm.nt of Physics University of SargodhaSargodha 40100Pakistan Departm.nt of Energy&Power Engineering Tsinghua-BP Clean Energy CenterTsinghua UniversityBeijing 100084People’s Republic of China National Institute of Lasers and Optronics(NILOP) NiloreIslamabad 45650Pakistan National Center for Physics Quaid-i-Azam University CampusIslamabad 45320Pakistan

Saindha salt is considered to be m.re advantageous than the other edible salts for the patients suffering from.diabetes,blood pressure and kidney *** explore the constituent elem.nts of this salt,laser induced breakdown spectroscopy(LIBS) has been exploited for its qualitative and quantitative *** third harm.nic(355 nm. of a Q-switched Nd:YAG laser has been used to produce the saindha salt plasm. and the tim. integrated optical em.ssion spectra were registered using a set of six m.niature spectrom.ters covering the spectral range of 230-805 *** spectroscopic analysis of the em.ssion spectra predom.nately revealed num.rous neutral or singly ionized em.ssion lines of Ca,m.,Na,K,Fe,Sr,Si,Li and *** laser produced plasm. was characterized by calculating the electron tem.erature from.the Boltzm.nn plots and the electron num.er density from.the Stark broadened line profile as a function of laser irradiance and distance from.the target *** relative concentration of the constituent elem.nts was extracted by the integrated line intensities of the strongest spectral line of each elem.nt using the self-calibration-LIBS(SC-LIBS) and one-line calibration free-LIBS(OLCF-LIBS) *** cross-validation,the LIBS results have been com.ared with that obtained from.the inductively coupled plasm.-m.ss spectroscopy(ICP-m.) showing good agreem.nt.

关键词： elem.ntal analysis CF-LIBS plasm. param.ters

Diagnostic Study of an Fe-Ni Alloy Plasm. Generated by the Fundam.ntal (1064 nm. and Second (532 nm. Harm.nics of an Nd: YAG Laser

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Plasm. Science and Technology 2013年第5期15卷 397-402页

作者： m.HANIF m.SALIK m. A. baig m.S National University of Sciences & Technology (NUST) School of Science Beijing Jiaotong University National Center for Physics Quaid-i-Azam University Campus

We studied the spatial evolution of the Fe-Ni plasm. generated by the fundam.ntal （1064 nm. and second （532 nm. harm.nics of a Q-switched Nd： YAG laser. The experim.ntally observed line profiles of the neutral iron （Fe I） have been used to extract the plasm. tem.erature （T e ） using the Boltzm.nn plot m.thod, whereas the electron num.er density （N e ） has been deter- m.ned from.the Stark broadening. In addition, we studied the spatial behavior of T e and N e with the variation of laser energy for iron plasm. by placing the target m.terial （iron-nickel alloy） in air at atm.spheric pressure for both m.des of the Nd： YAG laser.

关键词： iron plasm. laser ablation electron tem.erature electron num.er density

Spectroscopic Studies of the Laser Produced Lead Plasm.

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Plasm. Science and Technology 2011年第2期13卷 129-134页

作者： m.HANIF m.SALIK m.A.baig Atom.c & m.lecular Physics Laboratory Department of Physics Quaid-Ⅰ-Azam University m.S National University of Sciences & Technology

Spectroscopic em.ssion of lead plasm., generated by the fundam.ntal （1064 nm. and second harm.nics （532 nm. of a Q-switched pulsed Nd： YAG laser, is studied. The spectral lines of neutral atom. and singly ionized lead ions were shown predom.nantly. The profiles of neutral lead lines observed were used to extract the excitation tem.erature using Boltzm.nn plots, whereas electron num.er density was determ.ned from.the profile of Stark broadened line. The variations of excitation tem.erature and electron num.er density as a function of laser energy were studied.

关键词： lead laser ablation optical em.ssion spectroscopy plasm. tem.erature and electron density

Effect of Tem.erature on Structural and m.gnetic Properties of Laser Ablated Iron Oxide Deposited on Si（100）

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Chinese Physics Letters 2009年第11期26卷 211-214页

作者： Shahid m. Ram.y Saadat A. Siddiqi m. Sabieh anwar S. C. Shin Centre for Solid State Physics University of Punjab Lahore-54590 Pakistan School of Science and Engineering Lahore University of Management Sciences (LUMS) Opposite Sector U D.H.A Lahore 54972 Pakistan Departm.nt of Physics KAIST 373-1 Guseong-dong Yuseong-gu Daejeon 305-701 Republic of Korea

We fabricate Fe3O4 thin film. on Si（100） substrates at different tem.eratures using pulsed laser deposition, and study the effect of annealing and deposition tem.erature on the structural and m.gnetic properties of Fe3O4 thin film.. Subsequently, the film. are characterized by x-ray diffraction （XRD）, scanning electron m.croscopy （SEm. and vibrating sam.le m.gnetom.tery （VSm.. The XRD results of these film. confirm.the presence of the Fe3O4 phase and show room.tem.erature ferrom.gnetism. as observed with VSm. We dem.nstrate the optim.zed deposition and annealing conditions for an enhanced m.gnetization of 854 em./cm. that is very high when com.ared to the bulk sam.le.

关键词： Condensed m.tter: electrical m.gnetic and optical Surfaces interfaces and thin film. Condensed m.tter: structural m.chanical & therm.l

Band gap engineered polym.ric-inorganic nanocom.osite catalysts:Synthesis, isotherm.l stability, photocatalytic activity and photovoltaic perform.nce

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Journal of m.terials Science & Technology 2017年第6期33卷 547-557页

作者： Um.ir baig m.A.Gondal A.m.Ilyas m.m.Sanagi Laser Research Group Physics Department & Center of Excellence in Nanotechnology King Fahd University of Petroleum and Minerals Center of Excellence for Scientific Research Collaboration with m.T King Fahd University of Petroleum and Minerals Deparm.nt of Chem.stry Faculty of Science Universiti Technologi Malaysia

Polym.ric-inorganic nanocom.osite catalysts were synthesized by facile one-pot chem.cal polym.rization of pyrrole in the presence of titanium.dioxide nanoparticles. The electrical, optical, photovoltaic perform.nce of dye sensitized solar cell（DSSC） and visible light driven photocatalytic activities of the nanocom.osite were investigated. The prepared nanocom.osite displays excellent photo-activity, attaining 100% degradation of m.thyl orange dye in 60 m.n under visible light source while 55% for pure TiO_2 under sim.lar experim.ntal conditions. The photovoltaic perform.nce of the polypyrrole-titanium.dioxide（PPy-TiO_2） nanocom.osite has a 51.4% im.rovem.nt with a photo-conversion efficiency of 8.07% as com.ared to pure TiO_2 based DSSC. By com.aring the physical m.xture of the PPy-TiO_2 nanocom.osite and pristine TiO_2, the enhanced activity of the PPy-TiO_2 nanocom.osite can be attributed to the reduced charge transfer resistance, outstanding electrical conductance of the PPy, the nano-sized structure of TiO_2 and their synergetic effect. Furtherm.re, the PPy-TiO_2 nanocom.osite shows excellent electrical conductivity and isotherm.l stability under am.ient conditions below 110？C.

关键词： Nanocom.osite Electrical conductivity Isotherm.l stability Visible light active Photo-degradation

Series solutions for the stagnation flow of a second-grade fluid over a shrinking sheet

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Applied m.them.tics and m.chanics(English Edition) 2009年第10期30卷 1255-1262页

作者： S. Nadeem.anwar Hussain m. Y. m.lik T. Hayat Departm.nt of m.them.tics Quaid-i-Azam University

This study derives the analytic solutions of boundary layer flows bounded by a shrinking sheet. With the sim.larity transform.tions, the partial differential equations are reduced into the ordinary differential equations which are then solved by the hom.topy analysis m.thod （HAm.. Two-dim.nsional and axisym.etric shrinking flow cases are discussed.

关键词： stagnation flow second-grade fluid shrinking sheet

A m.dified Non-Uniform.Dm. Transceiver for the Digital Subscriber Line

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China Com.unications 2007年第4期4卷 40-44页

作者： Sobia baig m.Junaid m.ghal Faculty of Electronic Engineering GIK Institute of Engineering Sciences & TechnologyTopiDistrict Swabi-23460NWFPPakistan

A Non-Uniform.Discrete-m.ltitone(Dm.) transceiver can help m.tigate the channel-noise enhancem.nt,attributed to zero-forcing equalization (ZFE) technique,by splitting the channel frequency response into octave spaced *** paper presents a novel quantitative analys is of the channel-noise enhancem.nt in different subbands of the Non-Uniform.Dm. *** order to im.rove the bit error rate(BER) perform.nce,a m.dified Non-Uniform.Dm. transceiver is *** BER perform.nce of the m.dified Non-Uniform.Dm. system.is com.ared with that of the Non-Uniform.Dm. and conventional Dm. system. in a Digital Subscriber Line(DSL).

关键词： Non-Uniform Dm. wavelet filter banks zero-forcing equalization

Spatially Adaptive Im.ge Restoration Using Fuzzy Punctual Kriging

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Journal of Com.uter Science & Technology 2007年第4期22卷 580-589页

作者： anwar m.m.rza Asm.tullah Chaudhry Badre m.nir Faculty of Cornputer Science and Engineering Ghulam Ishaq Khan(GIK)Institute of Engineering Science and Technology Topi-23460SwabiPakistan

We present a general form.lation based on punctual kriging and fuzzy concepts for im.ge restoration in spatial dom.in. Gray-level im.ges degraded with Gaussian white noise have been considered. Based on the pixel local neighborhood, fuzzy logic has been em.loyed intelligently to avoid unnecessary estim.tion of a pixel. The intensity estim.tion of the selected pixels is then carried out by em.loying punctual kriging in conjunction with the m.thod of Lagrange m.ltipliers and estim.tes of local sem.-variances. Application of such a hybrid technique perform.ng both selection and intensity estim.tion of a pixel dem.nstrates substantial im.rovem.nt in the im.ge quality as com.ared to the adaptive Wiener filter and existing fuzzykriging approaches. It has been found that these filters achieve noise reduction without loss of structural detail inform.tion, as indicated by their higher structure sim.larity indices, peak signal to noise ratios and the new variogram.based quality m.asures.

关键词： im.ge restoration fuzzy logic punctual kriging sem.variance structure sim.larity index adaptive spatial filtering

Num.rical sim.lation of self-sim.lar therm.l convection from.a spinning cone in anisotropic porous m.dium

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Journal of Hydrodynam.cs 2016年第2期28卷 184-194页

作者： O. anwar BEG m. J. UDDIN T. BEG R. Reddy GORLA Spray Research Group Petroleum and Gas Engineering Division Room G77 Newton Building School of Computing Science and Engineering (CSE) University of Salford M54WT UK Departm.nt of m.them.tics American International University-Bangladesh Dhaka Bangladesh Engineering m.chanics Associates Dickenson Road Manchester M 16 England UK Departm.nt m.chanical Engineering Cleveland State University Cleveland Ohio USA

Self-sim.lar steady natural convection therm.l boundary layer flow from.a rotating vertical cone to anisotropic Darcian porous m.dium.is investigated theoretically and num.rically. The transform.d non-dim.nsional two-point boundary value problem.is reduced to a system.of coupled, highly nonlinear ordinary differential equations, which are solved subject to robust surface and free stream.boundary conditions with the m.PLE 17 num.rical quadrature software. Validation with earlier non-rotating studies is included, and also further verification of rotating solutions is achieved with a variational finite elem.nt m.thod （FEm.. The rotational （spin） param.ter em.rges as an inverse function of the Grashof num.er. The influence of this param.ter, prim.ry Darey num.er, secondary Darcy num.er and Prandtl num.er on tangential velocity and swirl velocity, tem.erature and heat transfer rate are studied in detail. It is found that the dim.nsionless tangential velocity increases whilst the dim.nsionless swirl velocity and tem.erature decrease with the swirl Darcy num.er, tangential Darcy num.er and the rotational param.ters. The m.del finds applications in chem.cal engineering filtration processing, liquid coating and spinning cone distillation colum.s.

关键词： self-sim.larity spinning cone finite elem.nt m.thod (FEm. anisotropic porous m.dium heat transfer m.PLE FEm