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Heat Transfer Analysis for Dropwise-Filmwise Hybrid surface of steam on Vertical Plate

Journal of Thermal science 2021年第3期30卷 962-972页

作者： ALHAsHEM Abdulwahab khan Jamil school of Technological studies Public Authority for Applied Education and TrainingSafat 13092Kuwait Mechanical Engineering Department College of Engineering and ComputingUniversity of South CarolinaColumbiaSC 29201USA

A model is proposed to predict and evaluate the heat transfer characteristics of dropwise-filmwise hybrid *** is approached by modifying the original drop-size distribution,which is defined for fully dropwise condensation(DWC)and making it applicable for dropwise-filmwise condensation(DFC).The modification is achieved by simulation work to determine two parameters:the area fraction occupied by large drops f and the ratio of the maximum radius of newly formed drops to that of larger drops γ.simulation results show a good agreement with the literature for fully DWC and provide a correlation for each parameter with respect to DWC region width in the DFC hybrid *** present model evaluates the heat transfer performance of DFC by utilizing these correlations.A comparison is made between the proposed model with experimental work from the literature and results show a good *** changing filmwise condensation(FWC)region width significantly affects the overall heat transfer performance,utilizing smaller width to that of DWC region has the advantage over fully ***,surface renewal within the hydrophobic region is controlled by adjusting the DWC region *** the ratio of drop maximum diameter to DWC region width is unity,surface renewal is achieved by drops merging to adjacent FWC regions *** the ratio is less than unity,surface renewal is achieved by sweeping of departing drops within the hydrophobic region and by *** each case,an optimum DWC region width which corresponds to the maximum DFC heat flux is defined.

关键词： dropwise-filmwise hybrid surface dropwise condensation region width filmwise condensation region width drop-size distribution maximum radius to region width ratio

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The Fractional Investigation of Fornberg-Whitham Equation Using an Efficient Technique

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Computer Modeling in Engineering & sciences 2023年第4期135卷 259-273页

作者： Hassan khan Poom Kumam Asif Nawaz Qasim khan shahbaz khan Department of Mathematics AbdulWali Khan UniversityMardan23200Pakistan Department of Mathematics Near East University TRNCMersin10Turkey Center of Excellence in Theoretical and Computational science(TaCs-CoE)&KMUTTFixed Point Research Laboratory Room SCL 802 Fixed Point LaboratoryScience Laboratory BuildingDepartments of MathematicsFaculty of ScienceKing Mongkut’s University of Technology Thonburi(KMUTT)Bangkok10140Thailand Department of Medical Research China Medical University HospitalChina Medical UniversityTaichung40402Taiwan

In the last few decades,it has become increasingly clear that fractional calculus always plays a very significant role in various branches of applied *** this reason,fractional partial differential equations(FPDEs)are of more importance to model the different physical processes in nature more ***,the analytical or numerical solutions to these problems are taken into serious consideration and several techniques or algorithms have been developed for their *** the current work,the idea of fractional calculus has been used,and fractional FornbergWhithamequation(FFWE)is represented in its fractional view ***-knownmethod which is residual power series method(RPsM),is then implemented to solve *** are discussed through graphs and tables which conform to the higher accuracy of the proposed *** solutions at different fractional orders are obtained and shown to be convergent toward an integer-order *** the RPsM procedure is simple and straightforward,it can be extended to solve other FPDEs and their systems.

关键词： Caputo derivative fractional partial differential equations fornberg-whitham residual power series method

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significance of activation energy and Wu's slip features in Cross nanofluid with motile microorganisms

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Communications in Theoretical Physics 2020年第10期72卷 1-11页

作者： sami Ullah khan Hassan Waqas Taseer Muhammad Muhammad Imran Malik Zaka Ullah Department of Mathematics COMSATS University IslamabadSahiwal 57000Pakistan Department of Mathematics Government College UniversityFaisalabad 38000Pakistan Department of Mathematics College of SciencesKing Khalid UniversityAbha 61413Saudi Arabia Department of Mathematics Faculty of ScienceKing Abdulaziz UniversityJeddah 21589Saudi Arabia

The current article investigates the impact of the bioconvection in an unsteady flow of magnetized Cross nanofluid with gyrotactic microorganisms and activation energy over a linearly stretched *** analysis has been performed by utilizing the realistic Wu's slip boundary and zero mass flux *** effects of nonlinear thermal radiation and the activation energy are also *** governing flow equations are deduced to a dimensionless form by considering suitable transformations which are numerically targeted via a shooting *** physical visualization of each physical parameter governing the flow problem has been displayed graphically for distribution of velocity,temperature,concentration and motile *** numerical treatment for the variation of skin friction coefficient,local Nusselt number,local sherwood number and motile density number is performed in tabular forms.

关键词： Cross nanofluid nonlinear thermal radiation gyrotactic motile microorganism Wu's slip shooting technique

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Interdependence of friction, wear, and noise: A review

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Friction 2021年第6期9卷 1319-1345页

作者： Kevin LONTIN Muhammad khan Cranfield University MK430ALUK

Phenomena of friction,wear,and noise in mechanical contacts are particularly important in the field of tribomechanics but equally complex if one wants to represent their exact relationship with mathematical *** have been made to describe these phenomena with different approaches in *** efforts have been compiled in different reviews but most of them treated friction,wear mechanics,and acoustic noise ***,an in-depth review that provides a critical analysis on their interdependencies is still *** this review paper,the interdependencies of friction,wear,and noise are analysed in the mechanical contacts at asperitical *** origin of frictional noise,its dependencies on contact’s mechanical properties,and its performance under different wear conditions are critically reviewed.A discussion on the existing mathematical models of friction and wear is also provided in the last section that leads to uncover the gap in the existing *** review concludes that still a comprehensive analytical modelling approach is required to relate the interdependencies of friction,noise,and wear with mathematical expressions.

关键词： noise acoustic emission wear friction

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Electrical features of radio-frequency atmospheric pressure helium discharge with and without dielectric electrodes

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Plasma science and Technology 2019年第2期21卷 60-67页

作者： H AsHRAF s Z A sHAH H I A QAZI M A khan s HUssAIN M A BADAR s NIAZ M sHAFIQ Department of Physics University of Sargodha Department of Physics Quaid-i-Azam University

A comparative study of radio-frequency atmospheric pressure glow discharge(rf APGD)generated in helium with and without dielectric electrodes to investigate the effect of electrodes insulation on electrical features of APGD is presented. In the α mode, both the rf APGDs remain volumetric, stable and uniform. In the γ mode, the APGD without dielectric electrodes shrinks into a constricted plasma column whereas APGD with dielectric electrodes remains stable and retains the same volume without plasma constriction even at higher densities of discharge current. A comparison of electrical features of both rf APGDs in normal and abnormal glow discharge regimes is presented. In both APGDs with and without dielectric electrodes,impedance measurements have been performed and compared with equivalent circuit *** measured impedance data is found to be in good agreement with simulated data.

关键词： radiofrequency atmospheric pressure glow discharge dielectric electrodes plasma stability control

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Monte-Carlo simulation of a stochastic differential equation

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Plasma science and Technology 2017年第12期19卷 6-14页

作者： Arif ULLAH Majid khan M KAMRAN R khan 盛正卯 Hefei National Laboratory for Physical sciences at the Microscale University of Science and Technology of ChinaHefei 230026People's Republic of China Department of Physics Quaid-i-Azam University Islamabad Pakistan Department of Physics Institute of Fusion Theory and SimulationsZhejiang UniversityHangzhou 310027People's Republic of China Department of Physics COMSATS Institute of Information TechnologyChack ShahzadIslamabadPakistan Department of Physics Abdul Wali Khan University23200 MardanKPKPakistan

For solving higher dimensional diffusion equations with an inhomogeneous diffusion coefficient,Monte Carlo（MC） techniques are considered to be more effective than other algorithms, such as finite element method or finite difference method. The inhomogeneity of diffusion coefficient strongly limits the use of different numerical techniques. For better convergence, methods with higher orders have been kept forward to allow MC codes with large step size. The main focus of this work is to look for operators that can produce converging results for large step sizes. As a first step, our comparative analysis has been applied to a general stochastic ***, our formulization is applied to the problem of pitch angle scattering resulting from Coulomb collisions of charge particles in the toroidal devices.

关键词： Monte-Carlo simulation stochastic differential equations toroidal plasmas numerical methods

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Brain-derived neurotrophic factor signaling in the neuromuscular junction during developmental axonal competition and synapse elimination

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Neural Regeneration Research 2025年第2期20卷 394-401页

作者： Josep Tomàs Víctor Cilleros-Mañé Laia Just-Borràs Marta Balanyà-segura Aleksandra Polishchuk Laura Nadal Marta Tomàs Carolina silvera-simón Manel M.santafé Maria A.Lanuza Unitat d’Histologia i Neurobiologia(UHNeurob) Facultat de Medicina i Ciències de la SalutUniversitat Rovira i VirgiliReusSpain

During the development of the nervous system,there is an overproduction of neurons and *** competition between neighboring nerve endings and synapses performing different activity levels leads to their elimination or *** have extensively studied the involvement of the brain-derived neurotrophic factor-Tropomyosin-related kinase B receptor neurotrophic retrograde pathway,at the neuromuscular junction,in the axonal development and synapse elimination process versus the synapse *** purpose of this review is to describe the neurotrophic influence on developmental synapse elimination,in relation to other molecular pathways that we and others have found to regulate this *** particular,we summarize our published results based on transmitter release analysis and axonal counts to show the different involvement of the presynaptic acetylcholine muscarinic autoreceptors,coupled to downstream serine-threonine protein kinases A and C(PKA and PKC)and voltage-gated calcium channels,at different nerve endings in developmental *** dynamic changes that occur simultaneously in several nerve terminals and synapses converge across a postsynaptic site,influence each other,and require careful studies to individualize the mechanisms of specific *** describe an activity-dependent balance(related to the extent of transmitter release)between the presynaptic muscarinic subtypes and the neurotrophin-mediated TrkB/p75NTR pathways that can influence the timing and fate of the competitive interactions between the different axon *** downstream displacement of the PKA/PKC activity ratio to lower values,both in competing nerve terminals and at postsynaptic sites,plays a relevant role in controlling the elimination of supernumerary ***,calcium entry through L-and P/Q-subtypes of voltage-gated calcium channels(both channels are present,together with the N-type channel in developing nerve terminals)contributes to red

关键词： acetylcholine release adenosine receptors axonal competition brain-derived neurotrophic factor calcium channels motor end-plate muscarinic acetylcholine receptors postnatal synapse elimination serine kinases tropomyosin-related kinase receptorB

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Non-axisymmetric Homann stagnation-point flow of Walter’s B nanofluid over a cylindrical disk

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Applied Mathematics and Mechanics(English Edition) 2020年第5期41卷 725-740页

作者： M.khan M.sARFRAZ J.AHMED L.AHMAD C.FETECAU Department of Mathematics Quaid-i-Azam UniversityTaxila 47050Pakistan Department of Basic sciences University of Engineering and TechnologySheringal Upper Dir 18000Pakistan Department of Mathematics Shaheed Benazir Bhutto UniversitySheringal Upper Dir 18000Pakistan Academy of Romanian scientists Bucuresti 050094Romania

The study of non-axisymmetric Homann stagnation-point flow of Walter’s B nanofluid along with magnetohydrodynamic(MHD) and non-linear Rosseland thermal radiation over a cylindrical disk in the existence of the time-independent free stream is considered. Moreover, the notable impacts of thermophoresis and Brownian motion are analyzed by Buongiorno’s model. The momentum, energy, and concentration equations are converted into the dimensionless coupled ordinary differential equations via similarity transformations, which are later numerically solved by altering the values of the pertinent parameters. The numerical and asymptotic solutions for the large shear-to-strain rate ratio γ =a/bfor the parameters of the displacement thicknesses and the wall-shear stress are computed by perturbative expansion and analyzed. Furthermore, the technique bvp4c in MATLAB is deployed as an efficient method to analyze the calculations for the non-dimensional velocities, temperature, displacement thickness, and concentration profiles. It is observed that the two-dimensional displacement thickness parameters α andβ are reduced due to the viscoelasticity and magnetic field effects. Moreover, when the shear-to-strain rate ratio approaches infinity, α is closer to its asymptotic value, while βand the three-dimensional displacement thickness parameter δ1 show the opposite *** outcomes of the viscoelasticity and the magnetic field on the skin friction are also determined. It is concluded that ■ reaches its asymptotic behavior when the shearto-strain rate ratio approaches infinity. Meanwhile, ■ shows different results.

关键词： Walter’s B fluid cylindrical disk nanofluid magnetic field non-linear thermal radiation stagnation-point flow

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Women in visual neural regeneration research

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Neural Regeneration Research 2025年第2期20卷 489-490页

作者： Tonia s.Rex David J.Calkins Vanderbilt Eye Institute Vanderbilt University Medical CenterNashvilleTNUSA

The year 2024 marks the 60^(th)anniversary of Title IX and 25 years since the New York Times revealed bias against female faculty members at the Massachusetts Institute of *** take an opportunity here to examine the state of gender bias in a relatively new yet already prominent field,neural regeneration in the visual system,for which there is a well-defined context useful for this *** National Eye Institute(NEI)provided the first round of research funding for its Audacious Goals Initiative(AGI)on visual neural regeneration in 2013 and the last round in ***,we focus on this *** sources included PubMed,the National science Foundation(NsF),the NEI,the Blue Ridge Institute for Medical Research and data from the major professional organization for eye and vision research,the Association for Research in Vision and Ophthalmology(ARVO).

关键词： neural visual Times

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Unlocking hypoglycemia–associated brain microvascular dysfunction:critical insights from proteomic analysis

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Neural Regeneration Research 2025年第6期20卷 1707-1708页

作者： siva s.V.P.sakamuri Anil sakamuri Department of Chemistry Auburn University at MontgomeryMontgomeryALUSA Vascular Biology Center and Department of Medicine Medical College of Georgia at Augusta UniversityAugustaGAUSA

Hypoglycemia-a critical complication linked to worsened brain function in diabetic subjects:Hypoglycemia is characterized by a decline in circulatory glucose levels below sta nda rd physiological *** hypoglycemia,classified as level 1 hypoglycemia,is defined by blood glucose levels below 70 mg/dL and can be effectively addressed through carbohydrate *** hypoglycemia,denoted by blood glucose levels less than 54 mg/dL,poses a life-threatening risk if left *** with type 1 and type 2 diabetes undergoing insulin treatment are particularly susceptible to hypoglycemia due to impaired counterregulatory mechanisms.

关键词： impaired intake critical

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