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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

VIBRATION OPTIMIZATION OF A PAssIVE sUsPENsION sYsTEM VIA GENETIC ALGORITHM

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International Journal of Modeling, simulation, and scientific Computing 2013年第1期4卷 1-21页

作者： s.d.JABEEN school of Applied sciences Haldia Institute of Technology Haldia 721301 West BengalIndia

In this paper,we have formulated mathematical models to optimize the bouncing transmissibility of the sprung mass of the half car system with passengers’seat suspensions considering different road *** corresponding problem has been solved with the help of advanced real coded Genetic Algorithm(GA).The nonlinearity of suspension spring and damper,which are the most important characteristics of the suspension,has been taken into account in order to validate the model to real *** nonlinear cubic polynomial has been used to describe the spring characteristic and a quadratic polynomial has been used to describe the damper *** coefficients of each polynomial represent the design parameters of the suspension system and are to be *** find these parameters we have formulated a nonlinear optimization problem in which the bouncing transmissibility of the sprung mass at the center of mass has been minimized with respect to technological constraints and the constraints which satisfy the performance as per IsO 2631 *** advanced real coded GA has been used to solve this problem in time domain and the results obtained have been compared to those obtained using the existing design *** objective function and the constraints have been evaluated by simulating the vehicle model over two roads with multiple bumps at uniform velocity.

关键词： Passive suspension vibration behavior road bump genetic algorithm and optimization.

solutions of Fractional Partial differential Equations of Quantum Mechanics

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Advances in Applied Mathematics and Mechanics 2013年第5期5卷 639-651页

作者： s.d.Purohit department of Basic sciences(Mathematics) College of Technology and EngineeringM.P.University of Agriculture and TechnologyUdaipur-313001India

The aimof this article is to investigate the solutions of generalized fractional partial differential equations involving Hilfer time fractional derivative and the space fractional generalized Laplace operators,occurring in quantum *** solutions of these equations are obtained by employing the joint Laplace and Fourier transforms,in terms of the Fox’s *** special cases as solutions of one dimensional non-homogeneous fractional equations occurring in the quantum mechanics are *** results given earlier by saxena et al.[***.,13(2)(2010),pp.177-190]and Purohit and Kalla[***.,44(4)(2011),045202]follow as special cases of our findings.

关键词： Fractional schrodinger equation Laplace transform Fourier transform Hilfer fractional derivative Fox’s H-function and Quantum mechanics

Fabrication of sAW sensor for detecting Chemical Agent

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稀有金属材料与工程 2006年第A03期35卷 433-435页

作者： J H Lee B s Joo J s Huh d d Lee school of Electronic & Electrical Engineering Kyungpook National UniversityKorea dept.of Materials science and Metallurgy Kyungpook National UniversityKorea

sAW sensors using five different types of polymer to detect of chemical agents(dMMP,CH_3CN,CH_2Cl_2,dCP) have been fabricated and its gas response characteristics were extensively *** polymers used as the sensing material are polyisobutylene(PIB),polyepichlorohydrin(PECH),polydimethylsiloxane(PdMs),polyisoprene(PIP)and polybutadiene(PBd).Their thin films were coated on quartz substrate by spin coating *** types of simulants gases,dimethylmethylphosphonate(dMMP),acetonitrile(CH_3CN)and dichloromethane(CH_2Cl_2),dichloropentane(dCP)were used as target gases,instead of the real nerve,blood,choking and vesicant *** spin coating of PIB and PECH,the substrates were heated to 65℃with N_2 flow for 1 h to remove the cyclohexane and ethylacetate which was used as solvent. PdMs was heated to 75℃with N_2 flow for 2 h to remove the ethylacetate which was used as *** and PIP on the substrate were heated to 60℃with N_2 flow for 1 h to remove the benzen which was used as *** sensing characteristics of the sAW sensors were measured by using E-5061A network analyzer.

关键词： sAW dMMP CH3CN CH2Cl2 dCP polymer film

Investigation of third-grade non-Newtonian blood flow in arteries under periodic body acceleration using multi-step differential transformation method

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Applied Mathematics and Mechanics(English Edition) 2015年第11期36卷 1449-1458页

作者： M.HATAMI s.E.GHAsEMI s.A.R.sAHEBI s.MOsAYEBIdORCHEH d.d.GANJI J.HATAMI department of Mechanical Engineering Esfarayen University of Technology Young Researchers and Elite Club Islamic Azad University deptartment of Mechanical Engineering Islamic Azad University department of Mechanical Engineering Babol University of Technology Garmsar Health & Care Center Semnan University of Medical Sciences

In this paper, a non-Newtonian third-grade blood in coronary and femoral arteries is simulated analytically and numerically. The blood is considered as the third- grade non-Newtonian fluid under the periodic body acceleration motion and the pulsatile pressure gradient. The hybrid multi-step differential transformation method （Hybrid-Ms- dTM） and the Crank-Nicholson method （CNM） are used to solve the partial differential equation （PdE）, and a good agreement between them is observed in the results. The effects of the some physical parameters such as the amplitude, the lead angle, and the body acceleration frequency on the velocity and shear stress profiles are considered. The results show that increasing the amplitude, Ag, and reducing the lead angle of body acceleration, 9, make higher velocity profiles on the center line of both arteries. Also, the maximum wall shear stress increases when Ag increases.

关键词： pulsatile blood third-grade non-Newtonian fluid differential transforma-tion method (dTM) femoral artery coronary artery

Radiogenic source Identification for the Helium Production-diffusion Equation

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Communications in Computational Physics 2013年第6期14卷 1-20页

作者： Gang Bao todd A.Ehlers Peijun Li department of Mathematics Zhejiang UniversityHangzhou 310027China department of Mathematics Michigan State UniversityEast LansingMI 48824USA department of Geosciences Wilhelmstrasse 56Universitat TubingenD-72074TubingenGermany department of Mathematics Purdue UniversityWest LafayetteIN 47907USA

Knowledge of helium diffusion kinetics is critical for materials in which helium measurements are made,particulary for *** most cases the helium ages were younger than expected,an observation attributes to diffusive loss of helium and the ejection of high energy alpha *** it is important to accurately calculate the distribution of the source term within a *** this paper,the prediction of the helium concentrations as function of a spatially variable source term are *** the forward and inverse solutions are *** the assumption of radially symmetric geometry,an analytical solution is deduced based on the eigenfunction *** regularization methods,the Tikhonov regularization and the spectral cutoff regularization,are considered to obtain the regularized *** estimates with optimal convergence order are shown between the exact solution and the regularized *** examples are presented to illustrate the validity and effectiveness of the proposed methods.

关键词： Inverse source problem production-diffusion equation Tikhonov regularization

Flexible ultra-thin super-resolution endoscopy

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science China(Physics,Mechanics & Astronomy) 2024年第3期67卷 171-172页

作者： George s.d.Gordon department of Electrical and Electronic Engineering University of NottinghamNottingham NG7 2RDUK

In recent years, multimode fiber(MMF) has become an important tool for high-resolution endoscopic imaging in narrow channels(e.g., in the brain via needles or inside blood vessels) due to its high mode density and fine diameter, typically stacle to widespread deployment in applications is that realistic perturbations, including bending, twisting and changes in temperature, cause unacceptable image degradation.

关键词： fiber resolution typically

Effects of laser phase transformation hardening parameters on heat input and hardened-bead profile quality of unalloyed titanium

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Transactions of Nonferrous Metals society of China 2010年第6期20卷 1078-1091页

作者： d.s.BAdKAR K.s.PANdEY G.BUVANAsHEKARAN Maulana Azad National Institute of Technology Welding Research Institute Bharat Heavy Electricals Limited

Laser transformation hardening(LTH)of unalloyed titanium of 1.6 mm-thick sheet,nearer to AsTM Grade 3 of chemical composition was investigated using 2 kW CW Nd:YAG *** effects of laser power(750-1 250 W),scanning speed(1 000-3 000 mm/min)and focal point position(from-10 to-30 mm)on the heat input,and hardened-bead geometry(*** bead width(HBW),hardened depth(Hd)and angle of entry of hardened bead profile with the surface(AEHB))were investigated using response surface methodology(RsM).The experimental plan is based on Box-Behnken design matrix *** and quadratic polynomial equations for predicting the heat input and the hardened bead geometry were *** results indicate that the proposed models predict the responses adequately within the limits of hardening parameters being *** is suggested that regression equations can be used to find optimum hardening conditions for desired criteria.

关键词： laser transformation hardening response surface methodology(RsM) unalloyed titanium titanium hardened-bead profile

Genotoxicity of Pesticide Waste Contaminated soil and Its Leachate

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Biomedical and Environmental sciences 2004年第3期17卷 257-265页

作者： s.d.sIVANEsAN K.KRIsHNAMURTHI s.d.WACHAsUNdER T.CHAKRABARTI Environmental Biotechnology division Environmental Biotechnology DivisionInstrumentation Division National Environmental Engineering Research Institute Nehru Marg Nagpur-440 020 IndiaEnvironmental Biotechnology Division

Objective Improper land disposal of hazardous waste can result in leaching of hazardous constituents which may contaminate ground and surface water leading to adverse impact on human health and environment consequences. The present study utilized mammalian cell culture for the genotoxicity assessment of waste and its leachate. Methods Genotoxic potential and chemical analysis of pesticide derived tarry waste contaminated soil extract and its leachate was assessed using in vitro human lymphocyte cultures and GC-Ms. Results The investigation revealed that the soil extract could cause significant to highly significant genotoxicity in the form of dNA strand break at 25 mL (Pd 200 mL (Pd chromosomal aberration at 25 mL (Pd 50 mL and 100 mL (Pd cause significant dNA strand break and chromosomal aberration only at 100 mL and 200 mL (Pdose levels. Conclusion The genotoxicity observed is attributed to carbaril and tetra methyl naphthyl carbamate, the major ingredients of the extracts, as revealed by GC-Ms.

关键词： Genotoxicity soil extract Leachate dNA strand break Chromosomal aberration Gas chromatography mass spectrometery (GC-Ms) Fluorimetric analysis of dNA unwinding assay (FAdU)