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Transport mechanism in chemically reactive hybrid nanofluid flow containing gyrotactic micro-organisms over a curved oscillatory surface

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Applied mathematics and mechanics(English Edition) 2025年第1期46卷 177-192页

作者： m.nAVEED m.ImRAn T.ASGHAR z.ABBAS Department of mathematics Division of Science and TechnologyUniversity of Education Department of mathematics The Islamia University of Bahawalpur

This paper examines the transport analysis, including both heat transfer and mass transfer, in hybrid nanofluid flow containing gyrotactic microorganisms towards a curved oscillatory surface. The influence of magnetic fields is also inspected in terms of their physical characteristics. To depict the phenomena of transport, modified versions of both Fick's and Fourier's laws are used. Additionally, the characteristics of both heterogeneous and homogeneous chemical reactions are also incorporated. Utilizing a curvilinear coordinate system, the flow problem is formulated as partial differential equations(PDEs)for momentum, concentration, microorganism field, and energy. An analytical solution to the obtained flow equations is achieved utilizing the homotopy analysis method(HAm).The effects of significant flow parameters on the pressure and microorganism fields, velocity, oscillation velocity, concentration, and temperature distributions are shown via graphs. Furthermore, the variations in skin friction, mass transfer rate, heat transfer rate, and local motile number due to different involved parameters are presented in tables and are analyzed in detail. Graphical results indicate that the curves of velocity and temperature fields are enhanced as the values of the solid volume fraction variables *** is also verified that the concentration rate field decreases as the values of the homogeneous reaction strength parameter and the radius of curvature parameter increase, and it increases with the Schmidt number and the heterogeneous reaction strength *** outcomes show a favorable response of the motile number to advanced values of the Peclet number, the Schmidt number, the microorganism difference parameter, and the bio-convective lewis number.

关键词： hybrid nanofluid oscillating curved stretchable sheet gyrotactic microorganism Cattaneo-Christov heat and mass flux chemical reaction analytical solution O368

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RESEARCH On lASER DIRECT DEPOSITIOn PROCESS OF Ti-6Al-4V AllOY

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Acta metallurgica Sinica(English letters) 2007年第3期20卷 171-180页

作者： S.Y. Gao Y.z. zhang l.k. Shi B.l. Du m.z. Xi H.z. Ji mechanical Engineering College Yanshan University O~mhuangdao 066004 China Beijing General Research Institute for nonferrous metals Beijing 100088 China

laser direct deposition （lDD） of metallic components is an advanced technology of combining CAD/CAm （computer aided design/computer aided manufacturing）, high power laser, and rapid prototyping. This technology uses laser beam to melt the powders fed coaxiaUy into the molten pool by the laser beam to fabricate fuUy dense metallic components. The present article mainly studies the lDD of Ti-6Al-4V alloy, which can be used to fabricate aircraft components. The mechanical properties of the Ti-6Al-4V alloy, fabricated by lDD, are obtained using the tension test, and the oxygen content of used powders and deposited specimens are measured. In the present article, it can be seen that the mechanical properties obtained using this method are higher than the ones obtained by casting, and equal to those got by wrought anneal. One aircraft part has been made using the lDD process. Because of this aircraft part, with sophisticated shape, the effect of the laser scanning track on the internal soundness of the deposited part was discussed.

关键词： laser direct deposition Ti-6Al-4V alloy mechanical property depositing process aircraft component

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TRAnSFORmATIOn BEHAVIOR OF Ti_(50-x/2)ni_(50-x/2)Cu_x AllOYS

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Acta metallurgica Sinica(English letters) 2006年第6期19卷 391-396页

作者： J. Wang W. Jin m.z. Cao R. Yang Institute of metal Research Chinese Academy of Sciences Shenyang 110016 China Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China

Phase transformation behavior of Ti50-x/2ni50-x/2Cux (x=2, 5, 15) alloys was investigated using differential scanning calorimetry (DSC). The results show that Ti50-x/2ni50-x/2Cux alloys undergo a two-stage martensitic transformation on cooling and transform reversely in one stage on heating when treated at 823k for 5 hours. Heat treatment has no effect on the transformation behavior of Ti49ni49Cu2 alloy but does influence that of Ti47.5ni47.5Cu5 alloy and Ti42.5ni42.5Cu15 alloy. Effect of heat treatment is related with precipitation of CuniTi phase. The maximum recoverable elongation of Ti49ni49Cu2 wire is about 6%.

关键词： microstructure transformation shape memory Ti-ni-Cu

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nUmERICAl SOlUTIOnS FOR A nEARlY CIRCUlAR CRACk WITH DEVElOPInG CUSPS UnDER SHEAR lOADInG

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Acta mechanica Solida Sinica 2011年第5期24卷 439-449页

作者： n.m.A.nik long l.F.koo z.k.Eshkuvatov Department of mathematics Faculty of ScienceUniversity Putra malaysia Institute for mathematical Research University Putra malaysia

In this paper, we study the behavior of the solution at the crack edges for a nearly circular crack with developing cusps subject to shear loading. The problem of finding the resulting force can be written in the form of a hypersingular integral equation. The equation is then trans-formed into a similar equation over a circular region using conformal mapping. The equation is solved numerically for the unknown coefficients, which will later be used in finding the stress intensity factors. The sliding and tearing mode stress intensity factors are evaluated for cracks and displayed graphically. Our results seem to agree with the existing asymptotic solution.

关键词： nearly circular crack numerical method Galerkin method stress intensity factors hypersingular integral equation shear loading conformal mapping

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The dynamics of a nanosecond gas discharge development with an extended slot cathode in argon

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Plasma Science and Technology 2020年第12期22卷 78-88页

作者： n A ASHURBEkOV k O ImInOV G S SHAkHSInOV m.z.zAkARYAEVA k m RABADAnOV Dagestan State University Faculty of PhysicsMakhachkala 367000Russia Institute of Physics DFRC of RASMakhachkala 367015Russia

The article presents the results of an experimental study and numerical modelling for the formation and development dynamics of a high-voltage transverse nanosecond discharge generated by a slot cathode in an argon medium at a pressure range of 1–10 Torr. numerical modelling was carried out under similar experimental conditions for the processes of formation and propagation of ionisation waves, electron density distribution, excited atom and average electron energy in the discharge gap, including the cavity inside the cathode. At a pressure of p=1 Torr, a classical version of a high-voltage discharge is demonstrated to take place with no penetration of the plasma into the cathode cavity and no observed hollow cathode effect. An increase in gas pressure to 5 Torr leads to a penetration of plasma into the cathode cavity with the formation of a cathodic potential drop(CPD) region. Electrons emitted from the side surfaces of the cavity pass through the CPD region without collisions, oscillate inside the cathode cavity;the hollow cathode effect is fully manifested. At р=10 Torr, the modelling results qualitatively coincide with the results at р=5 Torr;in this case, however, hardly any accelerated electrons are observed in the gap between the electrodes, due to their energetic relaxation both inside the cathode cavity and when exiting from it. In both cases, the plasma structure formed at the exit of the cathode cavity involves a concentration of charged particles an order of magnitude higher than that in the rest of the gap, leading to a self-limiting discharge current effect. The results of the numerical modelling are in good agreement with experimental data.

关键词： nanosecond gas discharge numerical simulation argon excited atoms

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Simulation of the spatio-temporal evolution of the electron energy distribution function in a pulsed hollow-cathode discharge

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Plasma Science and Technology 2023年第3期25卷 87-94页

作者： n A ASHURBEkOV k O ImInOV k m RABADAnOV G S SHAkHSInOV m.z.zAkARYAEVA m B kURBAnGADzHIEVA Dagestan State University Department of Physics Harbin Institute of Technology Institute of Physics Dagestan Federal Research CenterRussian Academy of Sciences

This article presents the 2D simulation results of a nanosecond pulsed hollow cathode discharge obtained through a combination of fluid and kinetic *** spatio-temporal evolution of the electron energy distribution function(EEDF)of the plasma column and electrical characteristics of the nanosecond pulsed hollow cathode discharge at a gas pressure of 5 Torr are *** results show that the discharge development starts with the formation of an ionization front at the anode *** ionization front splits into two parts in the cathode cavity while propagating along its lateral *** ionization front formation leads to an increase in the fast isotropic EEDF component at its front,as well as in the anisotropic EEDF *** accelerated electrons enter the cathode cavity,which significantly contributes to the formation of the highenergy EEDF component and EEDF anisotropy.

关键词： pulsed nanosecond discharge electron energy distribution fuinction hollow cathode electron kinetics gas discharge

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Stress Intensity Factor for the Interaction between a Straight Crack and a Curved Crack in Plane Elasticity

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Acta mechanica Solida Sinica 2016年第4期29卷 407-415页

作者： m.R.Aridi n.m.A.nik long z.k.Eshkuvatov Institute for mathematical Research Universiti Putra Malaysia College of Foundation and General Studies Universiti Tenaga Nasional mathematics Department Faculty of Science Universiti Putra Malaysia

Formulation in terms of hypersingular integral equations for the interaction between straight and curved cracks in plane elasticity is obtained using the complex variable functions method. The curved length coordinate method and a suitable numerical scheme are used to solve such integrals numerically for the unknown function, which are later used to find the stress intensity factor, SIF.

关键词： hypersingular integral equation complex variable function method curved length coordinate method stress intensity factor

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numerical solutions for cracks in an elastic half-plane

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Acta mechanica Sinica 2019年第1期35卷 212-227,I0006页

作者： n.R.F.Elfakhakhre n.m.A.nik long z.k.Eshkuvatov mathematics Department Faculty of ScienceUniversiti Putra Malaysia43400 SerdangSelangorMalaysia Institute for mathematical Research Universiti Putra Malaysia43400 SerdangSelangorMalaysia Faculty of Science and Technology Universiti Sains Islam Malaysia71800 NilaiNegeri SembilanMalaysia

The behavior of the stress intensity factor at the tips of cracks subjected to uniaxial tension σχ^∞= p with traction-free boundary condition in half-plane elasticity is investigated. The problem is formulated into singular integral equations with the distribution dislocation function as unknown. In the formulation, we make used of a modified complex potential. Based on the appropriate quadrature formulas together with a suitable choice of collocation points, the singular integral equations are reduced to a system of linear equations for the unknown coefficients. numerical examples show that the values of the stress intensity factor are influenced by the distance from the cracks to the boundary of the half-plane and the configuration of the cracks.

关键词： Elastic half-plane multiple cracks Singular integral equation Sine-shaped crack

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Spectral measurements of hypervelocity flow in an expansion tunnel

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Acta mechanica Sinica 2019年第1期35卷 24-31,I0002页

作者： C.k.Yuan k.zhou Y.F.liu z.m.Hu z.l.Jiang State key laboratory of High-Temperature Gas Dynamic Institute of MechanicsChinese Academy of SciencesBeijing 100190China School of Engineering Sciences. University of Chinese Academy of Sciences Beijing 100049China China Academy of Aerospace Aerodynamics Beijing 100074China

Atmospheric reentry vehicles and planetary probes fly through the atmosphere at hypervelocity speed. At such speed, there is a significant proportion of heat load to the vehicle surface due to radiative heating. Accurate prediction needs a good knowledge of the radiation spectrum properties. In this paper, a high-speed camera and spectrograph coupled to an intensified charge-coupled device have bee n impleme nted to inv estigate the rad i at io n flow over a semi-cylinder model. The experiments were carried out in the JF16 expansi on timnel with secondary shock velocity of 7.9 km·s^-1. Results show that the emissio n spectrum comprises several atomic lines and molecular band systems. We give detailed data of the radiation spectrum, shock shape, shock detached distance and radiation intensity varying with space and wavelength. This valuable experimental dataset will be helpful to validate computational fluid dynamics codes and radiation models, which equates to increased prediction accuracy of radiation heating. Also, some suggestions for spectral measurement in hypervelocity flow field were list in the end.

关键词： Spectral measurement Hypervelocity flow Radiation Expansion tunnel

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Twisted Pair Cable Fault Diagnosis via Random Forest machine learning

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Computers, materials & Continua 2022年第6期71卷 5427-5440页

作者： n.B.Ghazali F.C.Seman k.Isa k.n.Ramli z.z.Abidin S.m.mustam m.A.Haek A.n.z.Abidin A.Asrokin Faculty of Electrical and Electronic Engineering Universiti Tun Hussein Onn MalaysiaBatu PahatJohor Tm Research&Development CyberjayaMalaysia

Applying the fault diagnosis techniques to twisted pair copper cable is beneficial to improve the stability and reliability of internet access in Digital Subscriber line(DSl)Access network *** network performance depends on the occurrence of cable fault along the copper ***,most of the telecommunication providers monitor the network performance degradation hence troubleshoot the present of the fault by using commercial test gear on-site,which may be resolved using data analytics and machine learning *** paper presents a fault diagnosis method for twisted pair cable fault detection based on knowledge-based and data-driven machine learning *** DSl Access network is emulated in the laboratory to accommodate VDSl2 Technology with various types of cable fault along the cable distance between 100 m to 1200 ***,the line operation parameters and loop line testing parameters are collected and used to ***,the feature transformation,a knowledge-based method,is utilized to pre-process the fault ***,the random forests algorithms(RFs),a data-driven method,are adopted to train the fault diagnosis classifier and regression algorithm with the processed fault ***,the proposed fault diagnosis method is used to detect and locate the cable fault in the DSl Access network *** results show that the cable fault detection has an accuracy of more than 97%,with less minimum absolute error in cable fault localization of less than 11%.The proposed algorithm may assist the telecommunication service provider to initiate automated cable faults identification and troubleshooting in the DSl Access network System.

关键词： Twisted pairs random forest machine learning cable fault DSl

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