检索结果-南通市图书馆

Hybrid Isothermal model for the Ferrohydrodynamic Chemically Reactive Species

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2019年第4期71卷 384-392页

作者： Noor muhammad S.Nadeem.m.T.mustafa Department of mathematics Quaid-I-Azam University 45320 Department of mathematics Statistics & Physics Qatar University

A hybrid isothermal model for the homogeneous-heterogeneous reactions in ferrohydrodynamic boundary layer ?ow is established. The characteristics of Newtonian heating and magnetic dipole in a ferro?uid due to a stretchable surface is analyzed for three chemical species. It is presumed that the isothermal cubic autocatalator kinetic gives the homogeneous reaction and the ?rst order kinetics gives the heterogeneous(surface) reaction. The analysis is carried out for equal diffusion coe?cients of all autocatalyst and reactions. Heat ?ux is examined by incorporating Fourier's law of heat conduction. Characteristics of materialized parameters on the magneto-therm.mechanical coupling in the ?ow of a chemically reactive species are investigated. Further, the heat transfer rate and friction drag are depicted for the ferrohydrodynamic chemically reactive species. It is evident that the Schmidt number has increasing behavior on the rate of heat transfer in the boundary layer. Comparison with available results for speci?c cases is found an excellent agreement.

关键词： ferromagnetic fluid hybrid chemically reactive species Newtonian heating heat transfer friction drag

Spectral features and antibacterial properties of Cu-doped ZnO nanoparticles prepared by sol-gel method

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2016年第7期25卷 459-465页

作者： Alireza Samavati A F Ismail Hadi Nur Z Othaman m K mustafa Centre for Sustainable Nanomaterials Ibnu Sina Institute for Scientific and Industrial ResearchUniversiti Teknologi Malaysia Advanced m.mbrane Technology Research Centre (AmTEC) Universiti Teknologi Malaysia Faculty of Science Technology and Human Development Universiti Tun Hussein Onn Malaysia

Zn（1-x）Cux O（x=0.00, 0.01, 0.03, and 0.05） nanoparticles are synthesized via the sol-gel technique using gelatin and nitrate precursors. The impact of copper concentration on the structural, optical, and antibacterial properties of these nanoparticles is demonstrated. Powder x-ray diffraction investigations have illustrated the organized Cu doping into ZnO nanoparticles up to Cu concentration of 5%（x = 0.05）. However, the peak corresponding to CuO for x= 0.01 is not distinguishable. The images of field emission scanning electron microscopy demonstrate the existence of a nearly spherical shape with a size in the range of 30–52 nm. Doping Cu creates the Cu–O–Zn on the surface and results in a decrease in the crystallite size. Photoluminescence and absorption spectra display that doping Cu causes an increment in the energy band gap. The antibacterial activities of the nanoparticles are examined against Escherichia coli（Gram negative bacteria）cultures using optical density at 600 nm and a comparison of the size of inhibition zone diameter. It is found that both pure and doped ZnO nanoparticles indicate appropriate antibacterial activity which rises with Cu doping.

关键词： Cu-doped ZnO nanoparticles photoluminescence antibacterial E.coli

Role of compositional changes on thermal,magnetic,and mechanical properties of Fe-P-C-based amorphous alloys

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2022年第1期31卷 472-479页

作者： Indah Raya Supat Chupradit mustafa m Kadhim mustafa Z mahmoud Abduladheem Turki Jalil Aravindhan Surendar Sukaina Tuama Ghafel Yasser Fakri mustafa Alexander N Bochvar Chemistry Department Faculty of Mathematics and Natural ScienceHasanuddin UniversityMakassarSouth Sulawesi90245Indonesia Department of Occupational Therapy Faculty of Associated Medical SciencesChiang Mai UniversityChiang Mai50200Thailand Department of Dentistry Kut University CollegeKutWasit52001Iraq College of Technical Engineering The Islamic UniversityNajafIraq Department of Pharmacy Osol Aldeen University CollegeBaghdadIraq Department of Radiology and medical Imaging College of Applied Medical SciencesPrince Sattam Bin Abdulaziz UniversityAl-Kharj 11942Saudi Arabia Faculty of Health University of CanberraCanberraACTAustralia Faculty of Biology and Ecology Yanka Kupala State University of Grodno230023 GrodnoBelarus Department of Pharmacology Saveetha Dental College and HospitalSaveetha Institute of Medical and Technical SciencesChennaiIndia Scientific Research Center Al-Ayen UniversityThi-Qar64001Iraq Department of Pharmaceutical Chemistry College of PharmacyUniversity of MosulMosulIraq Department of materials Physics Eotvos Lorand UniversityPázmány Péter sétány 1/ABudapest1117Hungary

This work aimed to tune the comprehensive properties of Fe-P-C-based amorphous system through investigating the role of microalloying process on the crystallization behavior,glass forming ability(GFA),soft magnetic features,and mechanical *** minor addition of elements into the system,it was found that the simultaneous microalloying of Ni and Co leads to the highest GFA,which was due to the optimization of compositional heterogeneity and creation of near-eutectic ***,the FeCoNiCuPC amorphous alloy exhibited the best anelastic/viscoplastic behavior under the nanoindentation test,which was owing to the intensified structural fluctuations in the ***,the improved plasticity by the extra Cu addition comes at the expense of magnetic properties,so that the saturation magnetization of this alloying system is significantly decreased compared to the FeCoPC amorphous alloy with the highest soft magnetic *** total,the results indicated that a combination of added elemental constitutes,i.e.,Fe69Co5Ni5Cu1P13C7 composition,provides an optimized state for the comprehensive properties in the alloying system.

关键词： Fe-based alloy saturation magnetization glass forming ability viscoplastic

Analytical and Approximate Solutions for Complex Nonlinear Schr?dinger Equation via Generalized Auxiliary Equation and Numerical Schemes

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2019年第11期71卷 1267-1274页

作者： mostafa m.A.Khater Dian-Chen Lu Raghda A.m.Attia mustafa Inc Department of mathematics Faculty of ScienceJiangsu UniversityChina Science Faculty Firat University23119 ElazigTurkey

This article studies the performance of analytical, semi-analytical and numerical scheme on the complex nonlinear Schr¨odinger(NLS) equation. The generalized auxiliary equation method is surveyed to get the explicit wave solutions that are used to examine the semi-analytical and numerical solutions that are obtained by the Adomian decomposition method, and B-spline schemes(cubic, quantic, and septic). The complex NLS equation relates to many physical phenomena in different branches of science like a quantum state, fiber optics, and water waves. It describes the evolution of slowly varying packets of quasi-monochromatic waves, wave propagation, and the envelope of modulated wave groups, respectively. moreover, it relates to Bose-Einstein condensates which is a state of matter of a dilute gas of bosons cooled to temperatures very close to absolute zero. Some of the obtained solutions are studied under specific conditions on the parameters to constitute and study the dynamical behavior of this model in two and three-dimensional.

关键词： complex NLS equation generalized auxiliary equation method adomian decomposition method B-splines schemes(cubic&quintic&septic)

Defining the effect of sweep tillage tool cutting edge geometry on tillage forces using 3D discrete element modelling

在线全文

学校读者我要写书评

暂无评论

Information Processing in Agriculture 2015年第2期2卷 130-141页

作者： mustafa Ucgul John m.Fielke Chris Saunders Barbara Hardy Institute School of EngineeringUniversity of South AustraliaMawson LakesSA 5095Australia

The energy required for tillage processes accounts for a significant proportion of total energy used in crop *** many tillage processes decreasing the draft and upward vertical forces is often desired for reduced fuel use and improved penetration,*** studies have proved that the discrete element modelling(DEm)can effectively be used to model the soil–tool *** his study,Fielke(1994)[1]examined the effect of the various tool cutting edge geometries,namely;cutting edge height,length of underside rub,angle of underside clearance,on draft and vertical *** this paper the experimental parameters of Fielke(1994)[1]were simulated using 3D discrete element modelling *** the simulations a hysteretic spring contact model integrated with a linear cohesion model that considers the plastic deformation behaviour of the soil hence provides better vertical force prediction was *** parameters were determined by comparing the experimental and simulation results of angle of repose and penetration *** results of the study showed that the simulation results of the soil-various tool cutting edge geometries agreed well with the experimental results of Fielke(1994)[1].The modelling was then used to simulate a further range of cutting edge geometries to better define the effect of sweep tool cutting edge geometry parameters on tillage *** extra simulations were able to show that by using a sharper cutting edge with zero vertical cutting edge height the draft and upward vertical force were further reduced indicating there is benefit from having a really sharp cutting *** extra simulations also confirmed that the interpolated trends for angle of underside clearance as suggested by Fielke(1994)[1]where correct with a linear reduction in draft and upward vertical force for angle of underside clearance between the ranges of-25 and-5°,and between-5 and 0°.The good correlations give confidence to recommend further invest

关键词： DEm Cutting edge geometry

Constraints on unconsolidated pyroclastic flow sediments related REE enrichments originated from potassic-alkaline Gölcük stratovolcano: Darıdere-Direkli-Yakaören (DDY) table 4deposits, southwestern Anatolia of Turkey

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Geochimica 2021年第6期40卷 926-944页

作者： murat Budakoglu Ali Tugcan Unluer Zeynep Doner Huseyin Kocaturk mustafa Kaya mustafa Kumral m.Sezai Kirikoglu Department of Geological Engineering Faculty of MinesIstanbul Technical UniversityIstanbulTurkey

In the last five decades,Rare Earth Elements(REE)are mostly produced from carbonatite complexes and alkaline magmatic *** this respect,pyroclastic flows produced by the potassic-alkaline Gölcük volcanism in the Isparta(SW,Turkey)angle stand out as an important target area where REE enrichments can be *** study focuses on the REE potential,geochemical and mineralogical characteristics of REE-bearing minerals as well as formation modeling of unconsolidated pyroclastic flows in Darıdere-Direkli-Yakaören(DDY)deposits in ***-bearing minerals of DDY deposits which contain abundant trachytic-trachyandesitic rock fragments were determined as fluorapatite,britholite,and chevkinite by using XRD and SEm–EDX *** to the geochemical analysis,the vast majority of RREE(up to 996 ppm)content is LREE such as La,Ce and ***ıdere is the most REE enriched region followed by Yakaören and Direkli regions in terms of LREE(574.9 ppm),relative to mREE(38.5 ppm)and HREE(5.28 ppm)*** results are also on par with subduction-related Italian extrusive carbonatites such as Polino,Cupaello and San *** DDY deposits can also be comparable with intraplate extrusive REE deposits in terms of LREE enrichments,however,HREE,Nb,Th and Zr values are generally *** RREE concentrations tend to rise with the increasing contents of alkaline elements(Na and K),HFSE(such as Nb and U),as well as LILE(Ba,Sr and Rb)and are negatively affected by sedimentary carbonate *** economic value of the DDY deposits can gain importance due to the increasing global demand for LREE’s.

关键词： Pyroclastic flows Rare Earth Elements(REE) Apatite Britholite Chevkinite Alkaline-Ultrapotasic magmatism

Influence of Non-linear Radiation Heat Flux on Rotating maxwell Fluid over a Deformable Surface: A Numerical Study

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2018年第4期69卷 461-466页

作者： m.mustafa A.mushtaq T.Hayat A.Alsaedi School of Natural Sciences (SNS) National University of Sciences and Technology (NUST) Research Centre for modeling and Simulation (RCmS) National University of Sciences and Technology (NUST) Department of mathematics Quaid-I-Azam University 45320 Department of mathematics Faculty of Science King Abdulaziz University

mathematical model for maxwell fluid flow in rotating frame induced by an isothermal stretching wall is explored numerically. Scale analysis based boundary layer approximations are applied to simplify the conservation relations which are later converted to similar forms via appropriate substitutions. A numerical approach is utilized to derive similarity solutions for broad range of Deborah number. The results predict that velocity distributions are inversely proportional to the stress relaxation time. This outcome is different from that observed for the elastic parameter of second grade fluid. Unlike non-rotating frame, the solution curves are oscillatory decaying functions of similarity variable. As angular velocity enlarges, temperature rises and significant drop in the heat transfer coefficient occurs. We note that the wall slope of temperature has an asymptotically decaying profile against the wall to ambient ratio parameter. From the qualitative view point, temperature ratio parameter and radiation parameter have similar effect on the thermal boundary layer. Furthermore, radiation parameter has a definite role in improving the cooling process of the stretching boundary.A comparative study of current numerical computations and those from the existing studies is also presented in a limiting case. To our knowledge, the phenomenon of non-linear radiation in rotating viscoelastic flow due to linearly stretched plate is just modeled here.

关键词： rotating frame maxwell model thermal radiation stretching sheet shooting method boundary layer flow

Solute transport and geochemical modeling of the coastal quaternary aquifer, Delta Dahab Basin, South Sinai, Egypt

在线全文

学校读者我要写书评

暂无评论

Acta Geochimica 2024年第1期43卷 16-39页

作者： Amira Samy mustafa Eissa Seham Shahen moustafa m.Said Rabab m.Abou-shahaba Division of Water Resources and Arid Land Department of HydrogeochemistryDesert Research CenterCairoEgypt Egypt Desalination Research Center of Excellence Desert Research CenterCairoEgypt Center for Water Supply Studies S&E-Physical&Environmental SciencesTexas A&M University Corpus ChristiCorpus ChristiUSA Department of Chemistry Faculty of Science(Girls)Al-Azhar UniversityYousef Abbas StrNasr CityP.O.Box:11754CairoEgypt

The wadi dahab delta is in a dry, arid coastal zone within Egypt’s south Sinai Peninsula’s eastern portion. The primary water source is the Quaternary coastal alluvial aquifer. The groundwater salinity varies from 890to 8213 mg/L, with a mean value of 3417 mg/L. The dissolved major ions have been used to calculate the seawater mixing index(SWmI) using a linear equation that discriminates the groundwater mostly affected by water–rock interaction(SWmI 1>) and other samples mixed with Seawater(SWmI mposition of groundwater for specifically chosen groundwater samples ranges from-0.645‰ to +5.212‰ for δ^(18)O and from-9.582‰ to + 22.778‰ for δ^(2)H, where the seawater represented by a Red Sea water sample(δ^(18)O + 1.64‰-δ^(2)H + 9.80‰) and reject brine water are considerably enriched the isotopic groundwater values. The geochemical NETPATH model constrained by the dissolved significant ions, isotopes, and the rock aquifer forming minerals as phases indicate the mixing percent with the seawater ranges from 9% to 97% of seawater from 91% to 3% of original recharge water. According to the SEAWAT 3-D flow models, seawater has penetrated the Northeastern Dahab delta aquifer, with the intrusion zone extending1500 m inland. The salt dissolution, upwelling of saline water, recharge from the upstream.mountain block, and seawater encroachment are the primary aspects contributing to the deterioration of groundwater quality. These findings may have significance for effective groundwater withdrawal management in arid locations worldwide with similar hydrogeological systems.

关键词： Groundwater geochemistry Seawater intrusion Solute transport SEAWAT

Heat transfer analysis in the flow of Walters' B fluid with a convective boundary condition

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2014年第8期23卷 382-388页

作者： T.Hayat Sadia Asad m.mustafa Hamed H.Alsulami Department of mathematics Quaid-i-Azam University 45320 Department of mathematics Faculty of Science King Abdulaziz University School of Natural Sciences National University of Science and Technology (NUST)

Radiative heat transfer in the steady two-dimensional flow of Walters＇ B fluid with a non-uniform heat source/sink is investigated. An incompressible fluid is bounded by a stretching porous surface. The convective boundary condition is used for the thermal boundary layer problem. The relevant equations are first simplified under usual boundary layer assumptions and then transformed into a similar form by suitable transformations. Explicit series solutions of velocity and temperature are derived by the homotopy analysis method （HAm）. The dimensionless velocity and temperature gradients at the wall are calculated and discussed.

关键词： Walters' B fluid heat source/sink convective boundary condition analytic solution