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Analytical behavior of weakly dispersive surface and internal waves in the ocean

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Journal of Ocean Engineering and Science 2022年第4期7卷 305-312页

作者： Mohammad Asif Arefin md.Abu Saeed M.ali akbar M.Hafiz Uddin Department of Mathematics Jashore University of Science and TechnologyJashore7408Bangladesh Department of Applied Mathematics University of RajshahiRajshahi6205Bangladesh

The(2+1)-dimensional interaction of a Riemann wave propagating along the y-axis with a long wave along the x-axis is described by the space-time fractional Calogero-Degasperis(CD)and fractional poten-tial Kadomstev-Petviashvili(PKP)*** can be modeled according to the Hamiltonian structure,the lax pair with the non-isospectral problem,and the pain level *** proposed equations are widely used in beachfront ocean and coastal engineering to describe the propagation of shallow-water waves,demonstrate the propagation of waves in dissipative and nonlinear media,and reveal the propagation of waves in dissipative and nonlinear *** this paper,we have established further exact solutions to the nonlinear fractional partial differential equation(NLFPDEs),namely the space-time fractional CD and fractional PKP equations using the modified Rieman-Liouville fractional derivative of Jumarie through the two variable(G/G,1/G)-expansion *** far as trigonometric,hyperbolic,and rational function so-lutions containing parameters are concerned,solutions are acquired when unique characteristics are as-signed to the ***,the solitary wave solutions are generated from the solutions of the traveling *** is important to observe that this method is a realistic,convenient,well-organized,and ground-breaking strategy for solving various types of NLFPDEs.

关键词： Two variable(G/G,1/G)-expansion method Exact solution Traveling wave solutions Solitary wave solutions The space-time fractional CD equation The space-time fractional PKP equation

Wave profile analysis of a couple of(3+1)-dimensional nonlinear evolution equations by sine-Gordon expansion approach

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Journal of Ocean Engineering and Science 2022年第3期7卷 272-279页

作者： md.Rezwan Ahamed Fahim Purobi Rani Kundu md.Ekramul Islam M.ali akbar M.S.Osman Department of Mathematics Pabna University of Science and TechnologyBangladesh Department of Applied Mathematics University of RajshahiBangladesh Department of Mathematics Faculty of ScienceCairo UniversityGiza 12613Egypt Department of Mathematics Faculty of Applied ScienceUmm Alqura UniversityMakkah 21955Saudi Arabia

The(3+1)-dimensional Kadomtsev-Petviashvili and the modified KdV-Zakharov-Kuznetsov equations have a significant impact in modern science for their widespread applications in the theory of long-wave propagation,dynamics of shallow water wave,plasma fluid model,chemical kinematics,chemical engineering,geochemistry,and many other *** this article,we have assessed the effects of wave speed and physical parameters on the wave contours and confirmed that waveform changes with the variety of the free factors in *** a result,wave solutions are extensively analyzed by using the balancing condition on the linear and nonlinear terms of the highest order and extracted different standard wave configurations,containing kink,breather soliton,bell-shaped soliton,and periodic *** extract the soliton solutions of the high-dimensional nonlinear evolution equations,a recently developed approach of the sine-Gordon expansion method is used to derive the wave solutions *** sine-Gordon expansion approach is a potent and strategic mathematical tool for instituting ample of new traveling wave solutions of nonlinear *** study established the efficiency of the described method in solving evolution equations which are nonlinear and with higher dimension(HNEEs).Closed-form solutions are carefully illustrated and discussed through diagrams.

关键词： Sine-Gordon expansion approach Kadomtsev-Petviashvili equation modified KdV-Zakharov-Kuznetsov equation soliton solutions

The static and cidal effects of veterinary antibiotics on soil microorganisms in the presence of organic and mineral amendments

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Soil Ecology Letters 2023年第4期5卷 125-135页

作者： ali akbar Safari Sinegani Mehdi Rashtbari Department of Soil Science College of AgricultureBu-Ali Sina UniversityHamadan ***Iran Department of Soil and Plant Microbiome Institute of PhytopathologyChristian-Albrechts-University of KielKielGermany

●Gentamicin initially decreased microbial activity comparative to penicillin higher.●Recovery was comparatively high in oxytetracycline treated soils.●Organic amendments improved the resilience indices.●Unexpectedly the qCO_(2) decreased in the antibiotic treated soils.●The static effects of the applied antibiotics were higher than their cidal *** study aimed to describe the static and cidal adverse effects of antibiotics on soil microbial activity resulting from manure ***,in the present study,the treatments included:without antibiotics;application of gentamicin,oxytetracycline,and penicillin each in different concentrations(50,100,and 200 mg kg−1 dry soil).They were applied in soils treated with and without organic and mineral conditioners(cow manure,biochar,and nano-zeolite).Soil microbial respiration and metabolic quotient were studied at three time periods(1−7,7−30,and 30−90 days)during a 90-day incubation of the treated *** applied to the soil samples significantly decreased soil basal respiration(BR)values compared to those of the control,and the most significant decrease was observed for *** had a short intensive impact,alleviated by manure and biochar,on soil *** a significant initial reduction in substrate-induced respiration(SIR),gentamicin application then caused a substantial increase in SIR *** metabolic quotient decreased in the antibiotic-treated *** study revealed that the static effects of the applied antibiotics in soil were greater than the cidal effects.

关键词： antibiotic resistance metabolic quotient microbial respiration soil resilience

The green fuel from carbon waste： optimization and product selectivity model studies

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International Journal of Coal Science & Technology 2018年第3期5卷 399-410页

作者： Hossein Atashi Fatemeh Rezaeian ali akbar Mirzaei Department of Chemical Engineering University of Sistan and Baluchestan Zahedan Iran Department of Chemistry University of Sistan and Baluchestan Zahedan Iran

Increase in greenhouse gases, has made scientists to substitute alternative fuels for fossil fuels. Nowadays, converting biomass into liquid by Fischer-Tropsch synthesis is a major concern for alternative fuels （gasoline, diesel etc.）. Selectivity of Fischer-Tropsch hydrocarbon product （green fuel） is an important issue. In this study, the experimental data has been obtained from three factors; temperature, H2/CO ratio and pressure in the fixed bed micro reactor. T = 543-618 （K）, P = 3-10 （bar）, H2/CO = 1-2 and space velocity = 4500 （l/h） were the reactor conditions. The results of product modeling for methane （CH4）, ethane （C2H6）, ethylene （C2H4） and CO conversion with experimental data were compared. The effective parameters and the interaction between them were investigated in the model. H2/CO ratio and pressure and interaction between pressure and H2/CO in ethane selectivity model and CO conversion and interaction between temperature and H2/CO ratio in methane selectivity model and ethylene gave the best results. To determine the optimal conditions for light hydrocarbons, ANOVA and RSM were employed. Finally, products optimization was done and results were concluded.

关键词： Selectivity model Fischer-Tropsch synthesis Green fuel Optimization Fixed bed micro reactor Alternative fuels

Dynamic simulation of the effect of time-dependent variation of pH on response variable of the tailing thickener of coal washing plant

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International Journal of Coal Science & Technology 2019年第1期6卷 127-137页

作者： Mehdi Rahimi ali akbar Abdollahzadeh Bahram Rezai Department of Mining and Metallurgical Engineering Amirkabir University of Technology TehranIran Department of Mining Engineering University of KashanKashanIran

Dynamic simulation approach can be used for understanding the nonlinear behavior in mineral processing circuits. In this study, the gel point, the main parameters of batch flux density function and the main parameters of effective solid stress were determined at different conditions (pH, flocculant dosage and particle size). Therefore, the main parameters of phenome no logical model of sedimentation and thickening were determined as a functio n of particle size, pH and flocculant dosages using the result of experimental tests and Curve expert professional software. Then, the dynamic simulation was carried out for the industrial thickener of coal washing plant and the time-dependent variation of response variables was investigated by time-dependent variation of pH of input feed to thickener using the obtained equations. It was observed that it is possible to predict the thickener behavior as a function of time for time dependent variation of pH of input feed to the thickener of coal washing plant using obtained equations that it was not possible using phenomenological model of thickener alone.

关键词： Dynamic simulation Dewatering Ideal continuous thickener Thickener behavior Time-dependent variation of pH

Numerical simulation of incipient particle motion

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International Journal of Sediment Research 2020年第1期35卷 1-14页

作者： ali Nasrollahi ali akbar Salehi Neyshabouri Goodarz Ahmadi Masoud Montazeri Namin Civil Engineering Department Tarbiat Modares University Department of Mechanical and Aeronautical Engineering Clarkson University Civil Engineering Department University of Tehran

A two-dimensional(2 D) computational model for simulation of incipient sediment motion for noncohesive uniform and non-uniform particles on a horizontal bed was developed using the Discrete Element Method(DEM).The model was calibrated and verified using various experimental data reported in the literature and compared with different theories of incipient particle *** analysis was done and the effects of relevant parameters were *** addition to hydrodynamic forces such as drag,shear lift and Magnus force,the particle-particle interaction effects were included in the *** asymptotic critical mobility number was evaluated for various critical particle Reynolds numbers(R*) in the range of very small and very large R*.The obtained curve is classified into four *** was found that in the linear region,the drag force has the principal role on the initiation of ***,the critical mobility number is independent of particle diameter.A procedure for estimating the critical shear velocity directly from the information on particle diameter and roughness height was ***,the mechanism of incipient motion for the different regions was studied and the effect of different forces on the incipient particle motion was *** was found that the maximum effects of lift and Magnus forces were,respectively,less than ten and twenty percent of the total *** drag force,however,was typically the dominant force accounting for majority of the net hydrodynamic force acting on sediment particles at the onset of incipient motion.

关键词： Incipient motion Shields curve Numerical simulation Drag force Lift force Magnus force Discrete Element Method

Natural Propulsion with Lorentz Force and Nanoparticles in a Bioinspired Lopsided Ciliated Channel

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Journal of Bionic Engineering 2017年第1期14卷 172-181页

作者： Noreen Sher akbar Liaqat ali Khan Zafar Hayat Khan Nazir Ahmed Mir DBS&H CEME National University of Sciences and Technology Islamabad Pakistan Basic Science Department Ripha International University Islamabad Pakistan Department of Mathematics University of Malakand Chakdara Dir (Lower) Khyber Pakhtunkhwa Pakistan

The transportation of biological and industrial nanofluids by natural propulsion like cilia movement and self-generated contraction-relaxation of flexible walls has tremendous applications in various fields. Inspired by multidisciplinary invention in this direction, a fuid mechanical model is proposed to study the Magneto-hydrodynamics （MHD） and heat transfer for nanofluids fabricated by the dispersion of nanoparticles in water as base fluid. The steady flow is induced by metachronal wave propulsion due to beating cilia. The flow regime is asymmetric channel. The flow is restricted under the low Reynolds number and long wavelength approximations. Cilia boundary conditions for velocity components are employed to find the exact solutions. The impacts of pertinent physical parameters on temperature profile, velocity profile, pressure, and stream lines are computed numerically. It is observed that velocity is inversely proportional to magnetic Reynolds number, Reynolds number, Strommer＇s number and velocity is directly proportional to flow rate. It is analyzed that temperature is inversely proportional to Strommer＇s number and magnetic Reynolds number and directly proportional to Brinkmann number and flow rate. The temperature is maximum at the center of the channel and it starts decreasing towards the boundary walls.

关键词： copper water nanoparticles induced magnetic field asymmetric ciliated channel

Promoter effect on the CO_2-H_2O formation during Fischer-Tropsch synthesis on iron-based catalysts

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Journal of Natural Gas Chemistry 2010年第2期19卷 193-197页

作者： ali Nakhaei Pour Seyed Mehdi Kamali Shahri Yahya Zamani akbar Zamanian Research Institute of Petroleum Industry (RIPI) of National Iranian Oil Company Gas Research DivisionP.O.Box 14665-137TehranIran

The effects of Mg,La and Ca promoters on primary and secondary CO2 and H2O formation pathways during Fischer-Tropsch synthesis on precipitated Fe/Cu/SiO2 catalysts are *** chemisorbed oxygen atoms in the primary pathway formed in the CO dissociation steps reacted with co-adsorbed hydrogen or carbon monoxide to produce H2O and CO2,*** secondary pathway was the water-gas shift *** results indicated that the CO2 production led to an increase in both primary and secondary pathways,and H2O production decreased when surface basicity of the catalyst increased in the order Ca 〉 Mg 〉 La.

关键词： Ca promoter Mg promoter La promoter Fischer-Tropsch synthesis iron-based catalyst water-gas shift reaction

Generalized and Improved(G′/G)-Expansion Method Combined with Jacobi Elliptic Equation

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Communications in Theoretical Physics 2014年第6期61卷 669-676页

作者： M.ali akbar Norhashidah Hj.Mohd.ali E.M.E.Zayed School of Mathematical Sciences Universiti Sains Malaysia Department of Applied Mathematics University of Rajshahi Mathematics Department Faculty of Science Zagazig University

In this article, we propose an alternative approach of the generalized and improved （G＇/G）-expansion method and build some new exact traveling wave solutions of three nonlinear evolution equations, namely the Boiti- Leon-Pempinelle equation, the Pochhammer-Chree equations and the Painleve integrable Burgers equation with free parameters. When the free parameters receive particular values, solitary wave solutions are constructed from the traveling waves. We use the Jacob/elliptic equation as an auxiliary equation in place of the second order linear equation. It is established that the proposed algorithm offers a further influential mathematical tool for constructing exact solutions of nonlinear evolution equations.

关键词： Boiti-Leon-Pempinelle equation Painleve integrable burgers equation Pochhammer-Chree equa-tion (GI/G)-expansion method traveling wave solutions