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Chinese Physics Letters 2011年第7期28卷 202-205页

作者： T.Hayat M.Mustafa s.obaidat Department of Mathematics Quaid-I-Azam University 45320Islamabad 44000Pakistan Department of Mathematics College of ScienceKing Saud UniversityP.O.Box 2455Riyadh 11451Saudi Arabia Research Centre for Modeling and simulation National University of Sciences and TechnologySector H-12IslamabadPakistan

Magnetohydrodynamic(MHD)mixed convection stagnation-point flow and heat transfer of power-law fluids towards a stretching surface is *** homotopy analysis method(HAM)is used in finding the series solution for a nonlinear *** form solutions for velocity and temperature fields are presented in the limiting *** results are *** is found that velocity and temperature are decreasing functions of power law *** computations for shear stress coefficient and local Nusselt number are *** present results are also compared with the existing numerical solution in a limiting sense.

关键词： problem limiting stretching

Exact solutions on MHD Flow Past an Accelerated Porous Plate in a Rotating Frame

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Chinese Physics Letters 2011年第5期28卷 168-171页

作者： T.Hayat Liaqat Ali.Khan R.Ellahi s.obaidat Department of Mathematics Quaid-i-Azam University Islamabad Pakistan Department of Mathematics King Saud UniversityRiyadhSaudi Arabia Department of Mathematics Military College MurreePakistan Department of Mathematics FBASIIUIH-10 SectorPakistan

We present an analysis of an electrically conducting viscous fluid over a porous plate in a rotating *** plate starts impulsively from rest relative to the rotating fluid moving with uniform acceleration in its own *** solutions are developed for both large and small *** addition,skin friction is *** variations of magnetic field and porosity are displayed and *** is noted that steady state behavior is not achieved even under the simultaneous effects of suction,magnetic field and rotation.

关键词： rotating plate viscous

series solution for Rotating Flow of an Upper Convected Maxwell Fluid over a stretching sheet

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Communications in Theoretical Physics 2011年第10期56卷 740-744页

作者： M.sajid Z.Iqbal T.Hayat s.obaidat Theoretical Plasma Physics Division PINSTECHP.O.Nilore Islamabad 44000Pakistan Department of Mathematics Quaid-i-Azam University 45320 Islamabad 44000Pakistan Department of Mathematics College of ScienceKing Saud UniversityP.O.Box.2455Riyadh 11451Saudi Arabia

为在一个旋转框架的上面的对流传热的麦克斯韦(UCM ) 液体的二维的流动的方程被建模。产生方程被一条边界层途径首先简化然后由一个 homotopy 分析方法(火腿) 解决了。系列答案的集中通过剩余错误曲线被讨论。影响的结果粘弹性并且旋转... 详细信息

为在一个旋转框架的上面的对流传热的麦克斯韦(UCM ) 液体的二维的流动的方程被建模。产生方程被一条边界层途径首先简化然后由一个 homotopy 分析方法(火腿) 解决了。系列答案的集中通过剩余错误曲线被讨论。影响的结果粘弹性并且旋转参数被阴谋并且讨论。

关键词：旋转参数流体流动对流 Ma 拉伸流动方程麦克斯韦同伦分析

Homotopy solution for stagnation-Point Flow

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Communications in Theoretical Physics 2012年第2期57卷 290-294页

作者： T.Hayat Ansa Rafique M.Y.Malik s.A.shehzad s.obaidat Department of Mathematics Quaid-i-Azam University 45320Islamabad 44000Pakistan Department of Mathematics College of SciencesKing Saud UniversityP.O.Box 2455Riyadh 1145Saudi Arabia

This article reports the homotopy solution for stagnation point flow of a non-Newtonian *** incompressible second grade fluid impinges on the wall either orthogonally or *** resulting nonlinear problems have been solved by a homotopy analysis method(HAM).Convergence of the series solutions is *** solutions are compared with the numerical solutions presented in a study [***-Linear Mech.43(2008) 941].Excellent agreement is noted between the numerical and series solutions.

关键词：同伦分析滞点不可压缩流体非线性问题非线性力学流体流动数值解 HAM

FOG COMPUTING ENABLED INTERNET OF EVERYTHING

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China Communications 2019年第3期16卷 I0001-I0003页

作者： Zhaolong Ning Lei Guo Joel Rodrigues Mohammad s.obaidat the school of software Dalian University of Technology Northeastern University the National Institute of Telecommunications the Instituto de Telecomunicacoes the Internet of Things Research Group CNPq the King Abdullah Ⅱ school of Information Technology University of Jordan sCs

With the rapid development of ubiquitous networks and smart cities,the connection and communication of Internet of Everything(IoE)have drawn great attention from both academia and *** main challenge for constructing IoE is to enable real-time communication and high-efficiency computing among mobile *** fog computing is promising to lower communication delay and offload network ***,how to realize fog-enabled communication and computing in IoE with high-dynamic and heterogeneous network characters has not been fully ***,deployment and reliable communications among fog nodes are also challenging.

关键词： FOG COMPUTING INTERNET OF EVERYTHING

Effect of Eu3+,Bi3+,and Li+ doping on luminescent property of GdNbO4

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Journal of Rare Earths 2024年第1期42卷 66-75页

作者： s.W.Wi Y.s.Lee Department of Physics and Integrative Institute of Basic sciences Soongsil University

We investigated the emission properties of Eu3+-doped GdNbO4-based oxide phosphors,aiming at improving the Eu3+emission by codoping of Bi3+and Li+.Eu3+singly doped,Eu3+and Bi3+doubly doped,and Eu3+,Bi3+,and Li+triply doped GdNbO4were prepared using a high-temperature solid-state reaction *** red-orange emissions from Eu3+in the singly doped samples are significantly improved by the codoping of Bi3+,mainly due to the energy transfer from Bi3+to Eu3+.The additional codoping of Li+is found to increase the Eu3+emission *** improvement might be attributed to the increase in the photoluminescent quantum yield originating from larger grain sizes and better crystallinity.A detailed analysis of the X-ray diffraction pattern and the asymmetric ratio estimated from the photoluminescence spectra show that the local lattice environment around Eu3+in GdNbO4does not change significantly with the codoping of Bi3+and Li+.Our results indicate that Li+doping is a promising way to improve the emission properties of rare-earth ion-doped GdNbO4phosphors.

关键词： Eu 3+ GdNbO 4 Codoping of Li + Photoluminescence sensitizer Rare earths

Tribological behavior of lubricant-impregnated porous polyimide

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Friction 2024年第4期12卷 711-725页

作者： Jinbang LI Ningning ZHOU Janet s.s.WONG school of Mechanical Engineering and Mechanics Ningbo UniversityNingbo 315211China Beijing Key Laboratory of Long-life Technology of Precise Rotation and Transmission Mechanisms Beijing Institute of Control EngineeringBeijing 100029China Department of Mechanical Engineering Imperial College LondonLondon SW72AZUK

Porous materials impregnated with lubricants can be used in conditions where limited lubricant is *** this work,three porous polyimides(PPI)with different densities were ***(PAO)impregnated PPI(iPPI)discs were rubbed against steel and sapphire *** operando observations of the iPPI-sapphire contacts show that oil is released under an applied load,forming a meniscus around *** at the outlet is created at high sliding *** amount of released oil increases with increasing PPI *** moduli,E*,estimated based on the actual contact size show that trapped oil in iPPIs contributes to load *** higher speeds,tribological rehydration of the contact occurs in low density iPPI,with that E*rises with *** high density PPIs,high speeds give a constantly high E*which is limited by the viscoelastic properties of the PPI network and possibly the rate of oil *** of iPPI-steel contacts is governed by the mechanical properties of the PPI,the flow of the lubricant,and the roughness of the PPI *** low-and medium-density(highly porous,high roughness)PPIs,large amount of oil is released,and lubrication is mainly via lubricant restricted in the contact in the pores and possibly tribological *** high density(low porosity)PPI,with lower roughness,hydrodynamic lubrication is achieved which gives the lowest *** results show that polymeric porous materials for effective lubrication require the optimization of its surface roughness,stiffness,oil flow,and oil retentions.

关键词： polyimide porous material friction mechanism polymer limited lubrication

Enhancing fatigue performance of AZ31 magnesium alloy components fabricated by cold metal transfer-based wire arc directed energy deposition through LPB

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Journal of Magnesium and Alloys 2024年第4期12卷 1638-1662页

作者： shambhu Kumar Manjhi srikanth Bontha A.s.s.Balan Department of Mechanical Engineering National Institute of Technology KarnatakaSurathkalSrinivasanagarMangaloreKarnataka 575025India

Cold Metal Transfer-Based Wire Arc Directed Energy Deposition(CMT-WA-DED)presents a promising avenue for the rapid fabrication of components crucial to automotive,shipbuilding,and aerospace ***,the susceptibility to fatigue of CMT-WA-DED-produced AZ31 Mg alloy components has impeded their widespread adoption for critical load-bearing *** this study,a comprehensive investigation into the fatigue behaviour of WA-DED-fabricated AZ31 Mg alloy has been carried out and compared to commercially available wrought AZ31 *** findings indicate that the as-deposited parts exhibit a lower fatigue life than wrought Mg alloy,primarily due to poor surface finish,tensile residual stress,porosity,and coarse grain microstructure inherent in the WA-DED *** Plasticity Burnishing(LPB)treatment is applied to mitigate these issues,which induce significant plastic deformation on the *** treatment resulted in a remarkable improvement of fatigue life by 42%,accompanied by a reduction in surface roughness,grain refinement and enhancement of compressive residual stress ***,during cyclic deformation,WA-DED specimens exhibited higher plasticity and dislocation density compared to both wrought and WA-DED+LPB specimens.A higher fraction of Low Angle Grain Boundaries(LAGBs)in WA-DED specimens contributed to multiple crack initiation sites and convoluted crack paths,ultimately leading to premature *** contrast,wrought and WA-DED+LPB specimens displayed a higher percentage of High Angle Grain Boundaries(HAGBs),which hindered dislocation movement and resulted in fewer crack initiation sites and less complex crack paths,thereby extending fatigue *** findings underscore the effectiveness of LPB as a post-processing technique to enhance the fatigue performance of WA-DED-fabricated AZ31 Mg alloy *** study highlights the importance of LPB surface treatment on AZ31 Mg components produced by CMT-WA-DED to remove surface d

关键词： Wire arc additive manufacturing AZ31 Mg alloy Low plasticity burnishing Low cycle fatigue test strain amplitude

Ren-integrable and ren-symmetric integrable systems

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Communications in Theoretical Physics 2024年第3期76卷 62-69页

作者： s Y Lou school of Physical science and Technology Ningbo UniversityNingbo315211China

A new type of symmetry,ren-symmetry,describing anyon physics and corresponding topological physics,is ***-symmetry is a generalization of super-symmetry which is widely applied in super-symmetric physics such as super-symmetric quantum mechanics,super-symmetric gravity,super-symmetric string theory,super-symmetric integrable systems and so *** and Grassmann numbers are,in some sense,dual conceptions,and it turns out that these conceptions coincide for the ren situation,that is,a similar conception of ren-number(R-number)is devised for *** particular,some basic results of the R-number and ren-symmetry are exposed which allow one to derive,in principle,some new types of integrable systems including ren-integrable models and ren-symmetric integrable *** examples of ren-integrable KdV-type systems and ren-symmetric KdV equations are explicitly given.

关键词： symmetries integrable systems anyon physics extended supersymmetry ren-symmetry

First evidence for chiral wobbling of triaxial nuclei

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Nuclear science and Techniques 2024年第7期35卷 4-7页

作者： s.Frauendorf Department of Physics and Astronomy University of Notre DameNotre DameIN 46556USA

Chirality(Greek“handiness”)is a property of many com-plex *** molecules exist in two forms,one being the mirror image of the *** for our hands,it is impossible to make the images identical by a suitable *** two forms are called left-handed and *** have the same binding energy,because the electro-magnetic interaction,which holds the molecule together,does not change under a *** properties that are insensitive to the geometry are also the *** different geometry is the reason why the left-handed form turns the polarization plane of transmitted light in one direction by some angle while the right-handed form turns it in the oppo-site direction by the same ***,the geometrical differences between the two species may have other *** two species of the carvon molecule shown in Fig.1 taste quite differently.

关键词： turns Chiral mirror