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Triad resonant wave interactions in electrically charged jets

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Applied Mathematics and Mechanics(English Edition) 2017年第8期38卷 1127-1148页

作者： s.ORIZAGA D.N.RIAHI Department of Mathematics University of Arizona Department of Mathematics University of Texas Rio Grande Valley

Nonlinear instability in electrically charged jets is studied using the governing electro-hydrodynamic equations describing stretching and thinning of a liquid jet. A jet flow system subject to both space and time evolving disturbances is considered. At the linear stage, the Rayleigh and conducting jet flow instability modes are *** instability in the flow is explored via triad resonant waves which uncover favorable operating modes not previously detected in the linear study of the problem. In particular, the jet radius is significantly reduced, and the electric field of the jet is properly oriented under the nonlinear study. It is found that taking into account the resonance triad modes provides a better mathematical description of a jet that stretches and thins due to tangential electric field effects. Both linear and nonlinear instability results in the jet flow system are presented and discussed.

关键词： electrically resonant instability hydrodynamic triad Rayleigh governing thinning radius favorable

Genetic-Chicken swarm Algorithm for Minimizing Energy in Wireless sensor Network

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Computer systems science & Engineering 2023年第2期44卷 1451-1466页

作者： A.Jameer Basha s.Aswini s.Aarthini Yunyoung Nam Mohamed Abouhawwash Department of Computer science and Engineering Hindusthan Institute of TechnologyCoimbatore641032India Department of Computer science and Engineering Soonchunhyang UniversityAsan31538Korea Department of Mathematics Faculty of ScienceMansoura UniversityMansoura35516Egypt Department of ComputationalMathematics science and Engineering(CMsE) Michigan State University East LansingMI48824USA.

Wireless sensor Network(WsN)technology is the real-time applica-tion that is growing rapidly as the result of smart *** power is one of the most signiﬁcant resources in *** enhancing a power factor,the clustering techniques are *** the forward of data in WsN,more power is *** the existing system,it works with Load Balanced Cluster-ing Method(LBCM)and provides the lifespan of the network with scalability and *** the existing system,it does not deal with end-to-end delay and deliv-ery of *** overcoming these issues in WsN,the proposed Genetic Algo-rithm based on Chicken swarm Optimization(GA-CsO)with Load Balanced Clustering Method(LBCM)is *** Algorithm generates chromosomes in an arbitrary method then the chromosomes values are calculated using Fitness *** swarm Optimization(CsO)helps to solve the complex opti-mization ***,it consists of chickens,hens,and *** divides the chicken into *** Balanced Clustering Method(LBCM)maintains the energy during communication among the sensor nodes and also it balances the load in the *** proposed GA-CsO with LBCM improves the life-span of the ***,it minimizes the energy consumption and also bal-ances the load over the *** proposed method outperforms by using the following metrics such as energy efﬁciency,ratio of packet delivery,throughput of the network,lifetime of the sensor ***,the evaluation result shows the energy efﬁciency that has achieved 83.56%and the delivery ratio of the packet has reached 99.12%.Also,it has attained linear standard deviation and reduced the end-to-end delay as 97.32 ms.

关键词： Energy efﬁciency sensor nodes chicken swarm optimization load balanced clustering method wireless sensor network cluster heads load-balancing ﬁtness function

Nonlinear vibration analysis of laminated composite Mindlin micro/nano-plates resting on orthotropic pasternak medium using DQM

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Applied Mathematics and Mechanics(English Edition) 2015年第8期36卷 1033-1044页

作者： A.G.ARANI G.s.JAFARI Faculty of Mechanical Engineering University of Kashan Institute of Nanoscience & Nanotechnology University of Kashan

The nonlocal nonlinear vibration analysis of embedded laminated micro- plates resting on an elastic matrix as an orthotropic pasternak medium is investigated. The small size effects of micro/nano-plate are considered based on the Eringen nonlocal theory. Based on the orthotropic Mindlin plate theory along with the von Kármán geo- metric nonlinearity and Hamilton＇s principle, the governing equations are derived. The differential quadrature method （DQM） is applied for obtaining the nonlinear frequency of system. The effects of different parameters such as nonlocal parameters, elastic me- dia, aspect ratios, and boundary conditions are considered on the nonlinear vibration of the micro-plate. Results show that considering elastic medium increases the nonlinear frequency of system. F^lrthermore, the effect of boundary conditions becomes lower at higher nonlocal parameters.

关键词： nonlinear vibration laminated micro-plate orthotropic pasternak medium,differential quadrature method

The Blood Flow of prandtl Fluid Through a Tapered stenosed Arteries in permeable Walls with Magnetic Field

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Communications in Theoretical physics 2015年第3期63卷 353-358页

作者： R.Ellahi s.U.Rahman s.Nadeem K.Vafai Department of Mechanical Engineering University of California Riverside Department of Mathematics and statistics Faculty of Basic Applied sciences International Islamic University Department of Mechatronics University of Engineering and Technology TexilaChakwal Campus Department of Mathematics Quaid-i-Azam University

This Communication deals with the blood flow of prandtl fluid through a tapered stenosed arteries having permeable *** governing equations of two-dimensional prandtl fluid model are modelled in cylindrical *** highly nonlinear equations are simplified with the help of non-dimensional variables under the assumption of mild *** solution of reduced nonlinear equation subject to boundary condition of porous walls having the effects of Darcy's number and slip parameter are computed analytically with the help of perturbation *** of emerging parameters such as impedance A,slip parameter a,stenosis height 6,magnetic parameter and stress component srz on velocity are illustrated *** streamlines have also been presented to discuss the trapping bolus discipline.

关键词： prandtl fluid magnetic field blood flow tapered stenosed arteries permeable walls analytical solutions

synthesis of CeO_2 nanoparticles using flame-assisted spray pyrolysis and solid state diffusion routes

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Rare Metals 2015年第1期34卷 6-11页

作者： K.R.Nemade s.A.Waghuley Department of physics Sant Gadge Baba Amravati University

The stable and crystalline phase of pure nano- structured CeO2 was directly synthesized by flame-assisted spray pyrolysis and solid state diffusion route. Different characterization techniques, including X-ray diffraction （XRD）, scanning electron microscopy （sEM）, Fourier trans- form infrared spectroscopy （FTIR）, ultraviolet-visible （UV- Vis）, and thermo gravimetric analysis （TGA） were employed to examine the structural, morphological, optical, and thermal properties of the final product. similarly, the comparative carbon dioxide （CO2）-sensing response of as-synthesized CeO2 nanoparticles by both routes was also reported. The CeO2 nanoparticles synthesized by solid state diffusion method exhibit good sensitivity （3.38 %） at room temperature, low operating temperature （398 K）, fast response time （32 s）, and recovery time （36 s） along with good stability.

关键词： CO2 gas sensing Flame-assisted spraypyrolysis solid state diffusion

synthesis and characterization of CNT/Ce-TiO_2 nanocomposite for phenol degradation

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Journal of Rare Earths 2012年第7期30卷 651-658页

作者： shaari N Tan s H Mohamed A R school of Chemical Engineering Engineering Campus University Sains Malaysia

An innovative photocatalyst, Carbon nanotube （CNT） supported Ce-TiO2 nanocomposite was successfully synthesized via modi-fied sol gel method and investigated in a batch reactor for abolition of phenol under UV light spectrum. Characterization of catalyst micro-structure and internal properties were done by means of X-ray diffraction （XRD）, Brunauer-Emmett-Teller （BET）, scanning electron micros-copy （sEM）, transmission electron microscopy （TEM） and UV-vis diffuse reflectance spectra （DRs）. Ce doping can inhibit phase transfor-mation from anatase to rutile and eliminate the recombination of electron-hole pairs in the catalyst. The presence of CNT in TiO2 composite can both increase the photoactivity under UV and change surface properties to achieve sensitivity to visible light. The optimum mass ratio of CNT support and cerium （Ce） dopant in TiO2 was the prominent factor to harvest CNT/Ce-TiO2 photocatalyst nanocomposite. The results demonstrated that optimum mass ratio of CNT：TiO2：Ce was 0.02：1.0：0.06, which resulted in the great performance of the photocatalyst to de-grade about 94% of phenol in a 50 mg/L solution in only 3 h. In this paper, dissimilar role of CNT support and Ce dopant in the TiO2 photo-catalysis of phenol was also discussed.

关键词： carbon nanotube (CNT) cerium TiO2 nanocomposite photocatalyst phenol rare earths

NUMERICAL LOCALIZATION OF ELECTROMAGNETIC IMpERFECTIONs FROM A pERTURBATION FORMULA IN THREE DIMENsIONs

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Journal of Computational Mathematics 2008年第2期26卷 149-195页

作者： M.Asch s.M.Mefire LAMFA Université de PicardieCNRs33rue Saint-Leu80039 AmiensFrance CMAp Ecole PolytechniqueCNRSRoute de Saclay91128 PalaiseauFrance

This work deals with the numerical localization of small electromagnetic inhomogeneities. The underlying inverse problem considers, in a three-dimensional bounded domain, the time-harmonic Maxwell equations formulated in electric field. Typically, the domain contains a finite number of unknown inhomogeneities of small volume and the inverse problem attempts to localize these inhomogeneities from a finite number of boundary measurements. Our localization approach is based on a recent framework that uses an asymptotic expansion for the perturbations in the tangential boundary trace of the curl of the electric field. We present three numerical localization procedures resulting from the combination of this asymptotic expansion with each of the following inversion algorithms： the Current projection method, the MUltiple signal Classification （MUsIC） algorithm, and an Inverse Fourier method. We perform a numerical study of the asymptotic expansion and compare the numerical results obtained from the three localization procedures in different settings.

关键词： Inverse problems Maxwell equations Electric fields Three-dimensional inho-mogeneities Electrical impedance tomography Current projection method MUsIC algo-rithm FFT Edge elements Numerical boundary measurements

Approximate energies and thermal properties of a position-dependent mass charged particle under external magnetic fields

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Chinese physics B 2017年第6期26卷 22-30页

作者： M Eshghi H Mehraban s M Ikhdair Young Researchers and Elite Club Central Tehran BranchIslamic Azad UniversityTehranIran Faculty of physics Semnan UniversitySemnanIran Department of physics Faculty of ScienceAn-Najah National UniversityNablusWest BankPalestine Department of Electrical Engineering Near East UniversityNicosiaNorthern CyprusMersin 10Turkey

We solve the schrodinger equation with a position-dependent mass（pDM） charged particle interacted via the superposition of the Morse-plus-Coulomb potentials and is under the influence of external magnetic and Aharonov–Bohm（AB） flux fields. The nonrelativistic bound state energies together with their wave functions are calculated for two spatially-dependent mass distribution functions. We also study the thermal quantities of such a system. Further, the canonical formalism is used to compute various thermodynamic variables for second choosing mass by using the Gibbs formalism. We give plots for energy states as a function of various physical parameters. The behavior of the internal energy, specific heat, and entropy as functions of temperature and mass density parameter in the inverse-square mass case for different values of magnetic field are shown.

关键词： schr?dinger equation Morse-plus-Coulomb potentials position-dependent mass distribution functions perpendicular magnetic and Aharonov–Bohm flux fields

Electron correlation in fast ion-impact single ionization of helium atoms

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Chinese physics B 2015年第1期24卷 240-246页

作者： E.Ghanbari-Adivi s.Eskandari Department of physics and Isfahan Quantum Optics Group (IQOG) Faculty of Science University of Isfahan Isfahan 81746-73441 Iran

A four-body distorted-wave approximation is applied for theoretical analysis of the fully differential cross sections（FDCs） for proton-impact single ionization of helium atoms in their ground states. The nine-dimensional integrals for the partial amplitudes are analytically reduced to closed-form expressions or some one-dimensional integrals which can be easily calculated numerically. Calculations are performed in the scattering and perpendicular planes. The influence of the target static electron correlations on the process is investigated using a number of different bound-state wave functions for the ground state of the helium targets. An illustrative computation is performed for 75-ke V proton–helium collisions and the obtained results are compared with experimental data and other theoretical predictions. Although for small momentum transfers, the comparison shows a reasonable agreement with experiments in the scattering and perpendicular planes, some significant discrepancies are still present at large momentum transfers in these planes. However, our results are compatible and for some cases, better than those of the other sophisticated calculations.

关键词： single ionization four-body collision distorted-wave approximation electron correlation