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Slip effects on unsteady mixed convection of hybrid nanofluid flow near the stagnation point

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Applied Mathematics and Mechanics(English Edition) 2022年第4期43卷 547-556页

作者： N.A.ZAINAL R.nazar K.NAGANTHRAN I.POP Department of Mathematical Sciences Faculty of Science and TechnologyUniversiti Kebangsaan MalaysiaBangi 43600Malaysia Fakulti Teknologi Kejuruteraan Mekanikal dan Pembuatan Universiti Teknikal Malaysia MelakaHang Tuah JayaDurian Tunggal 76100Malaysia Institute of Mathematical Sciences Faculty of ScienceUniversiti MalayaKuala Lumpur 50603Malaysia Center for Data Analytics Consultancy and ServicesFaculty of ScienceUniversiti MalayaKuala Lumpur 50603Malaysia Department of Mathematics Babes-Bolyai UniversityR-400084 Cluj-NapocaRomania

The unsteady mixed convection of the Al_(2)O_(3)-Cu/H_(2)O hybrid nanofluid flow near the stagnation point past a vertical plate is *** bvp4c technique is used to solve the resulting ordinary differential *** combined effects of the velocity and thermal slip are *** effects of different relevant physical parameters are studied *** results show that the heat transfer rate is reduced when the volume fraction of the nanoparticles increases,while the unsteadiness parameter has an opposite effect in the opposing *** presence of the slip parameter is proven to increase the skin friction coefficient while reduce the local Nusselt number in the buoyancy opposing flow.A contradictory result is observed in the buoyancy assisting ***,the heat transfer rate is reduced in the buoyancy of the assisting and opposing flows when the thermal slip effect is considered.

关键词： hybrid nanofluid mixed convection unsteady flow stagnation point

Source code fragment summarization with small-scale crowdsourcing based features

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Frontiers of Computer Science 2016年第3期10卷 504-517页

作者： Najam nazar He JIANG Guojun GAO Tao ZHANG Xiaochen LI Zhilei REN Key Laboratory for Ubiquitous Network and Service Software of Liaoning Province School of Software Dalian University of Technology Dalian 116621 China State Key Laboratory of Software Engineering Wuhan University Wuhan 430072 China Department of Computing The Hong Kong Polytechnic University Hong Kong China

Recent studies have applied different approaches for summarizing software artifacts, and yet very few efforts have been made in summarizing the source code fragments available on web. This paper investigates the feasibility of generating code fragment summaries by using supervised learning algorithms. We hire a crowd of ten individuals from the same work place to extract source code features on a cor- pus of 127 code fragments retrieved from Eclipse and Net- Beans Official frequently asked questions （FAQs）. Human an- notators suggest summary lines. Our machine learning algo- rithms produce better results with the precision of 82% and perform statistically better than existing code fragment classi- fiers. Evaluation of algorithms on several statistical measures endorses our result. This result is promising when employing mechanisms such as data-driven crowd enlistment improve the efficacy of existing code fragment classifiers.

关键词： summarizing code fragments supervised learning crowdsourcing

Darcy-Forchheimer flows of copper and silver water nanofluids between two rotating stretchable disks

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Applied Mathematics and Mechanics(English Edition) 2017年第12期38卷 1663-1678页

作者： T.HAYAT H.nazar M.IMTIAZ A.ALSAEDI Department of Mathematics Quaid-i-Azam UniversityIslamabad 44000Pakistan Nonlinear Analysis and Applied Mathematics(NAAM)Research Group Department ofMathematicsFaculty of ScienceKing Abdulaziz UniversityJeddah 21589Saudi Arabia Department of Mathematics University of WahWahcantt 47040Pakistan

This investigation describes the nanofluid flow in a non-Darcy porous medium between two stretching and rotating disks. A nanofluid comprises of nanoparticles of silver and copper. Water is used as a base fluid. Heat is being transferred with thermal radiation and the Joule heating. A system of ordinary differential equations is obtained by appropriate transformations. Convergent series solutions are obtained. Effects of various parameters are analyzed for the velocity and temperature. Numerical values of the skin friction coefficient and the Nusselt number are tabulated and examined. It can be seen that the radial velocity is affected in the same manner with both porous and local inertial parameters. A skin friction coefficient depicts the same impact on both disks for both nanofluids with larger stretching parameters.

关键词： magnetohydrodynamics (MHD) nanofluid stretchable rotating disk non-Darcy porous medium thermal radiation

Impact of anisotropic slip on the stagnation-point flow past a stretching/shrinking surface of the Al2O3-Cu/H2O hybrid nanofluid

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Applied Mathematics and Mechanics(English Edition) 2020年第9期41卷 1401-1416页

作者： N.A.ZAINAL R.nazar K.NAGANTHRAN I.POP Department of Mathematical Sciences Faculty of Science and TechnologyUniversiti Kebangsaan MalaysiaUKM Bangi 43600SelangorMalaysia Fakulti Teknologi Kejuruteraan Mekanikal dan Pembuatan Universiti Teknikal Malaysia MelakaDurian Tunggal 76100MelakaMalaysia Department of Mathematics Babes-Bolyai UniversityCluj-Napoca 400084Romania

The characteristics of heat transfer in the three-dimensional stagnationpoint flow past a stretching/shrinking surface of the Al2O3-Cu/H2O hybrid nanofluid with anisotropic slip are *** partial differential equations are converted into a system of ordinary differential equations by valid similarity *** simplified mathematical model is solved computationally by the bvp4c approach in the MATLAB operating *** solving method is capable of generating more than one solutions when suitable initial guesses are *** results are proven to have dual solutions,which consequently lead to the application of a stability analysis that verifies the achievability of the first *** findings reveal infinite values of the dual solutions at several measured parameters causing the non-appearance of the turning points and the critical *** skin friction increases with the addition of nanoparticles,while the escalation of the anisotropic slip effect causes a reduction in the heat transfer rate.

关键词： anisotropic slip three-dimensional flow stagnation-point hybrid nanofluid

Unsteady flow of a Maxwell hybrid nanofluid past a stretching/shrinking surface with thermal radiation effect

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Applied Mathematics and Mechanics(English Edition) 2021年第10期42卷 1511-1524页

The non-Newtonian fluid model reflects the behavior of the fluid flow in global manufacturing progress and increases product ***,the present work strives to analyze the unsteady Maxwell hybrid nanofluid toward a stretching/shrinking surface with thermal radiation effect and heat *** partial derivatives of the multivariable differential equations are transformed into ordinary differential equations in a specified form by applying appropriate *** resulting mathematical model is clarified by utilizing the bvp4c *** control parameters are investigated to see how they affect the *** results reveal that the skin friction coefficient increases by adding nanoparticles and suction *** inclusion of the Maxwell parameter and thermal radiation effect both show a declining tendency in the local Nusselt number,and as a result,the thermal flow efficacy is *** reduction of the unsteadiness characteristic,on the other hand,considerably promotes the improvement of heat transfer *** existence of more than one solution is proven,and this invariably leads to an analysis of solution stability,which validates the first solution viability.

关键词： non-Newtonian fluid Maxwell fluid hybrid nanofluid stretching/shrinking surface thermal radiation

Developing a phenomenological model to simulate single and mixed scale formation during flow in porous media:Coupling a salt precipitation model with an ion transport equation under dynamic conditions

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Petroleum Research 2024年第1期9卷 17-36页

作者： Erfan Hosseini Dana Mohammad nazar Negar Hosseini Mohammad Sarmadivaleh Exploration Directorate National Iranian Oil Company(NIOC)TehranIran Institute of Physical Chemistry and Polymer Physics Leibniz Institute of Polymer Research DresdenDresdenGermany Department of Petroleum Engineering Islamic Azad University(IAU)IlamIran WA School of Mines:Minerals Energy and Chemical EngineeringCurtin UniversityPerthWestern AustraliaAustralia

Water flooding and pressure maintenance are recommended to improve oil recovery practices after low recovery of petroleum reservoirs occurs during primary *** crystal formation is a frequent occurrence when using these *** experimental,numerical,and theoretical studies have been done on the mechanisms underlying scaling and permeability reduction in porous media;however,there has not been a satisfactory model *** study developed a phenomenological model to predict formation damage caused by salt *** with existing models,which provide a scaling tendency,the proposed model predicts the profile of scale *** salt precipitation model simulates reactive fluid flow through porous media.A thermodynamic,kinetic,and flow hydrodynamic model was developed and coupled with the ion transport equation to describe the movement of ***,a set of carefully designed dynamic experiments were conducted and the data were compared with the model *** forecasts and experimental data were observed to have an average absolute error(AAE)ranging from 0.68%to 5.94%,which indicates the model's suitability.

关键词： Improved oil recovery Water flooding Formation damage Scaling tendency Salt precipitation

Detailed investigation of optimized alkali catalyzed transesterification of Jatropha oil for biodiesel production

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Journal of Energy Chemistry 2015年第3期24卷 331-336页

作者： Waqas Ahmed muhammad Faizan nazar Syed Danish Ali Usman Ali Rana Salah Ud-Din Khan National Centre for Physics Quaid-i-Azam University Campus Office of Research Innovation and CommercializationUniversity of Gujrat Department of Chemistry University of Gujrat Sustainable Energy Technologies (SET) Center College of EngineeringPO-Box 800King Saud University

The non-edible oils are believed to be one of the major feedstock for the production of biodiesel in *** the present study,we investigated the production of Jatropha oil methyl esters（JOMEs） via alkali-catalyzed transesterification *** biophysical characteristics of Jatropha oil were found within the optimal range in accordance with ASTM standards as a substitute diesel *** chemical composition and production yield of as-synthesized biodiesel were confirmed by various analytical techniques such as FT-IR,1H NMR,13 C NMR and gas chromatography coupled with mass spectrometry.A high percentage conversion,～96.09%,of fatty acids into esters was achieved under optimized transesterification conditions with 6 ：1 oil to methanol ratio and 0.9 wt% Na OH for 50 min at ～60°***,twelve fatty acids methyl esters（FAME） were quantified in the GC/MS analysis and it was interesting to note that the mass fragmentation pattern of saturated,monounsaturated and diunsaturated FAME was comparable with the literature reported values.

关键词： Jatropha oil methyl esters transesterification biodiesel fuel gas chromatography mass spectrometry

Photosynthesis, Growth and Antioxidant Metabolism in Mustard (Brassica juncea L.) Cultivars Differing in Cadmium Tolerance

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Agricultural Sciences in China 2010年第4期9卷 519-527页

作者： Noushina Iqbal Asim Masood Rahat nazar Shabina Syeed Nafees A Khan Department of Botany Aligarh Muslim University

Two mustard （Brassica juncea L. Czern and Coss.） cultivars, Pusa Jai Kisan and SS2 differing in cadmium （Cd） tolerance were treated with 0, 25 and 50 umol L-1 Cd to study the physiological basis of difference in Cd tolerance. Cultivar SS2 （Cd sensitive） accumulated greater Cd in leaves than Pusa Jai Kisan （Cd tolerant）. Further, SS2 also exhibited higher contents of thiobarbituric acid reactive substances （TBARS） and H2O2 and electrolyte leakage. However, the activities of antioxidant enzymes, catalase （CAT）, ascorbate peroxidase （APX）, dehydroascorbate reduetase （DHAR）, and glutathione reductase （GR） were higher in Pusa Jai Kisan than those in SS2. Contrarily, the activity of superoxide dismutase （SOD） was higher in SS2 than that in Pusa Jai Kisan and was the greatest at 25 umol L-1 Cd. Treatment of 25 umol L-1 Cd induced the maximum activity of enzymes. However, the activity of GR increased up to 50 umol L-1 Cd in both the cultivars. The non-enzymatic antioxidants ascorbate （AsA） and glutathione （GSH） were higher in Pusa Jai Kisan than that in SS2, whereas dehydroascorbate （DHA） and oxidized glutathione （GSSG） were higher in SS2. Photosynthesis and growth were adversely and maximally decreased by 50 umol L-1 Cd treatment in both the cultivars, but SS2 exhibited greater reductions. The protection of photosynthesis and growth and lesser reduction in Pusa Jai Kisan were associated with its capacity to restrict accumulation of Cd in leaves resulting in lower level of TBARS and H2O2 and electrolyte leakage. Moreover, Pusa Jai Kisan exhibited efficient antioxidant metabolism for removal of Cd-induced reactive oxygen species.

关键词： antioxidant metabolism cadmium oxidative stress photosynthesis

Fabrication and Characterization of Crack Free Nano Porous Titanium Dioxide Thin Films by Spray Deposition Technique

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材料科学与工程（中英文版） 2010年第5期4卷 65-70页

作者： Manzar Abbas nazar Abbas Shah Fazali Subhan muhammad Irfan Department of Physics COMSATS Institute of Information Technology Islamabad 45320 Pakistan