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Journal of materials Science & Technology 2016年第11期32卷 1129-1136页

作者： m.nasir bashir A.S.m.A.Haseeb Abu Zayed mohammad Saliqur Rahman m.A.Fazal Department of mechanical Engineering University of Malaya

Rapid Cu diffusion is one of the main causes of electromigration（Em） failure in lead-free solder *** this study, an effort has been made to investigate the detrimental effects of Em on microstructure and mechanical performance of solder joint by introducing Co nanoparticles（NP） doped flux at the interface between SAC305 solder and copper substrate. Em tests were conducted on un-doped SAC305 and Co-doped SAC305 solder joints for different time intervals, with the maximum duration of 1128 h. A DC current was applied to the both types of solder joints to achieve a current density of 1 × 104A/cm2. Em tests were performed in an oil bath maintained at a constant temperature of 80 °C. It is found that Codoped flux significantly reduced the formation of cracks and voids at the cathode interface. Co atoms entered into the lattice of Cu6Sn5 leading to the formation of（Cu, Co）6Sn5. This thermodynamically stabilized the interfacial intermetallic（ImC） layers both at the anode and cathode sides and suppressed the change in their thickness. The average anodic growth rate of（Cu, Co）6Sn5 interfacial ImC in the doped sample was about one order of magnitude lower compared with that of Cu6Sn5 in the un-doped ***-NP also improved the tensile strength considerably before and after Em. The report suggests that the reliability of solder joint during Em can be improved by using Co-NP doped flux.

关键词： Electromigration damages Tensile strength Intermetallic compounds Nanoparticles Reliability

Effect of Fiber Loadings and Treatment on Dynamic mechanical, Thermal and Flammability Properties of Pineapple Leaf Fiber and Kenaf Phenolic Composites

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Journal of Renewable materials 2018年第4期6卷 383-393页

作者： m.Asim m.Jawaid m.nasir N.Saba Laboratory of Biocomposite Technology Institute of Tropical Forestry and Forest Products(INTROP)Universiti Putra Malaysia43400 SerdangSelangorMalaysia Department of Chemical Engineering College of EngineeringKing Saud UniversityRiyadhSaudi Arabia Composite Wood Forest Product DivisionForest Research Institute248006 DehradunIndia

This study deals with the analysis of dynamic mechanical,thermal and flammability properties of treated and untreated pineapple leaf fiber(PALF)and kenaf fiber(KF)phenolic *** indicated that storage modulus was decreased for all composites with increases in temperature and pattern of slopes for all composites,having almost the same values of E′at glass transition temperature(Tg).The peak of the loss modulus of pure phenolic composites was shown to be much *** the addition of kenaf/PALF,peaks were higher and shifted towards a high *** Tan delta peak height was low for pure phenolic composites and maximum for 60%PALF phenolic ***-Cole analysis was carried out to understand the phase behavior of the composite *** analysis(TGA)results indicated that pure phenolic composites have better thermal stability than PALF and kenaf phenolic *** and horizontal UL-94 tests were conducted and showed pure phenolic resin is highly fire *** overall results showed that treated KF composites enhanced the dynamic mechanical and thermal properties among all PALF/KF composites.

关键词： Pineapple leaf fiber kenaf fiber phenolic resin dynamic mechanical analysis thermogravimetric analysis flammability

ZnSe/ITO thin films:candidate for CdTe solar cell window layer

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Journal of Semiconductors 2017年第9期38卷 14-18页

作者： A.A.Khurram m.Imran Nawazish A.Khan m.nasir mehmood Industrial Technology Development National Centre for PhysicsIslamabadPakistan materials Science Laboratory Department of PhysicsQuaid-i-Azam UniversityIslamabadPakistan Optics Lab PINSTECHNilorePakistan

The crystal structure, electrical and optical properties of ZnSe thin films deposited on an In203 ：Sn （ITO） substrate are evaluated for their suitability as the window layer of CdTe thin film solar cells. ZnSe thin films of 80, 90, and 100 nm thickness were deposited by a physical vapor deposition method on Indium tin oxide coated glass substrates. The lattice parameters are increased to 5.834 A when the film thickness was 100 rim, which is close to that of CdS. The crystallite size is decreased with the increase of film thickness. The optical transmission analysis shows that the energy gap for the sample with the highest thickness has also increased and is very close to 2.7 eV. The photo decay is also studied as a function of ZnSe film thickness.

关键词： ZnSe thin films ITO substrate XRD optical transmission photodecay

Computing Topological Invariants of Triangular Chandelier Lattice

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Computers, materials & Continua 2020年第6期63卷 1119-1132页

作者： Nazeran Idrees Raghisa Khalid Fozia bashir Farooq Sumiya nasir Department of mathematics Government College University FaisalabadFaisalabad38000Pakistan Department of mathematics Al-Imam Mohammad Ibn Saud Islamic UniversityRiyadh11432Saudi Arabia College of Science and Human Studies Prince Mohammad Bin Fahd UniversityKhobar Dhahran34754Saudi Arabia

A numerical parameter mathematically derived from the graph structure is a topological *** topological index is the first actual choice in QSAR research and these indices are used to build the correlation model between the chemical structures of various chemicals ***,we investigate some old degree-based topological indices like Randic index,sum connectivity index,ABC index,GA index,1st and 2nd Zagreb indices,modified second Zagreb index,redefined version of 1st,2nd and 3rd Zagreb indices,hyper and augmented Zagreb indices,forgotten index and symmetric division degree index,and some new degree-based indices like SK index,SK1 index,SK2 index,and AG1 index of triangular chandelier-lattice(TCL).The results are generalized by using edge partition and closed formulas for topological indices of triangular chandelier-lattice are analysed.

关键词： Topological index Zagreb index graph triangular chandelier-lattice network

Darcy-Forchheimer mangetized flow based on differential type nanoliquid capturing Ohmic dissipation effects

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Propulsion and Power Research 2023年第3期12卷 443-455页

作者： m.Waqas Yunjie Xu m.nasir md mottahir Alam Amjad Ali Pasha Kashif Irshad Bandar m.Fadhl m.S.Kausar NUTECH School of Applied Science and Humanities National University of TechnologyIslamabad 44000Pakistan Department of mechanical Engineeing Lebanese American UniversityBeirutLebanon School of Engineering Huzhou UniversityHuzhou 313000China Faculty of Informatics and Computing University Sultan Zainal AbidinBesut Campus22200 BesutTereng-ganuMalaysia Department of Electrical and Computer Engineering King Abdulaziz UniversityJeddah 21589Saudi Arabia Aerospace Engineering Department King Abdulaziz UniversityJeddah 21589Saudi Arabia Interdisciplinary Research Centre for Renewable Energy and Power System(IRC-REPS) Research InstituteKing Fahd University of Petroleum and Minerals(KFUPM)Dhahran 31261Saudi Arabia mechanical Engineering Department College of Engineering and Islamic ArchitectureUmm Al-Qura UniversityP.O.Box 5555Makkah 21955Saudi Arabia

Hydromagnetic nanoliquid establish an extraordinary category of nanoliquids that unveil both liquid and magnetic *** interest in the utilization of hydromagnetic nanoliquids as a heat transporting medium stem from a likelihood of regulating its flow along with heat transportation process subjected to an externally imposed magnetic *** analysis reports the hydromagnetic nanoliquid impact on differential type(second-grade)liquid from a convectively heated extending *** well-known Darcy-Forchheimer aspect capturing porosity characteristics is introduced for nonlinear *** conditions elaborating heat-mass transportation effect are *** addition,Ohmic dissipation and suction/injection aspects are also a part of this *** analysis is done by implementing the basic relations of fluid *** modeled physical problem is simplified through order *** resulting systems(partial differential expressions)are rendered to the ordinary ones by utilizing the apposite *** solutions are constructed employing homotopy *** and numeric result are addressed comprehensively to elaborate the nature of sundry parameters against physical *** velocity profile is suppressed with increasing Hartmann number(magnetic parameter)whereas it is enhanced with increment in material parameter(second-grade).With the elevation in thermophoresis parameter,temperature and concentration of nanoparticles are accelerated.

关键词： Darcy-Forchheimer magnetized flow Differential type nanoliquid Ohimc dissipation Robin conditions Homotopy algorithm

Bioactivity analysis of the Ta（Ⅴ） doped SiO2–Ca O–Na2O–P2O5 ceramics prepared by solid state sintering method

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Progress in Natural Science:materials International 2016年第1期26卷 41-48页

作者： Rehana Zia madeeha Riaz Nida ul nasir Farhat Saleemi Zora Kayani Safia Anjum Farooq bashir Tousif Hussain Department of Physics Lahore College for Women University Government College for Women University CASP Government College

The main objective of the study was to control the degradation rate of material at a higher degradation rate improving the chemical stability of the material. Ta is known to have good chemical resistance, biocompatibility and show no adverse biological response. In the present study, Si O2–Na2O–Ca O–P2O5bioceramics with different Ta2O5contents was prepared by solid state sintering method at 1000 °C. The as-sintered ceramics were subjected to immersion studies in stimulated body fluid（SBF） for 21 days under static condition and characterized by XRD, FTIR, SEm, and AAS. The findings of the research indicate that the addition of Ta2O5controlled degradability, and all samples showed sufficient bioactivity.

关键词： Crystallization Bioactivity Ta2O5 Degradation rate Bioceramic

Effects of f(R) model on Dynamics of Axial Shear-Free Dissipative Fluids

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Communications in Theoretical Physics 2016年第4期65卷 483-491页

作者： m.Sharif Zunaira nasir Department of mathematics University of the Punjab

We present a general analysis on non-static axial system with dissipative shear-free anisotropic fluid using polynomial inflationary f(R) *** study the effects of dissipation on the dynamics of geodesic matter *** leads the system either to rotation-free or expansion-free but not both simultaneously under geodesic *** is found that the system preserves its symmetry in both *** the rotation-free case,when there is no dissipation and Ricci scalar is constant,the axial system reduces to FRW universe *** is exactly the same result obtained in general relativity.

关键词： f(R) gravity dissipative systems self-gravitating systems

Evolution of Dissipative Anisotropic Expansion-Free Axial Fluids

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Communications in Theoretical Physics 2015年第8期64卷 139-144页

作者： m.Sharif Zunaira nasir Department of mathematics University of the Punjab Quaid-i-Azam Campus

A general study of non-static restricted class of axial system with anisotropic dissipative expansion-free fluid under geodesic condition is carried out. It is found that expansion-free model must be dissipative under geodesic condition to preserve axial symmetry. We also investigate this system without geodesic condition. Finally, the role of dissipation is explored via transport equation.

关键词： general relativity dissipative systems analytical

Complexity of charged anisotropic spherically symmetric fluids in f(G)gravity

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Communications in Theoretical Physics 2023年第3期75卷 91-104页

作者： Z Yousaf m Z Bhatti m m m.nasir Department of mathematics University of the PunjabQuaid-i-Azam CampusLahore-54590Pakistan

The previous ideology of complexity factor for the dynamical spheres[Herrera et al 2018,***.D,98,104059]is extended for the influence of charge.A dynamical spherically symmetric non-dissipative and dissipative self-gravitating structure is examined in the presence of maxwell f(G)gravity to examine the complexity *** pattern of evolution is studied with the minimal complexity *** complexity factor remains the same for the structure of fluid distribution,while we examine homologous constraints for the most basic evolution *** calculate the structure scalars which play an important role in order to understand the fundamental properties of the *** fluid is geodesic as well as shearing for the dissipative case and there is a large number of *** the non-dissipative fluid distribution,a shear-free,homogeneous and isotropic,geodesic fluid correlates with the evolving homologous and vanishing complexity *** implication of the condition of vanishing complexity factor and stability are discussed at the end.

关键词： gravitation anisotropy complexity hydrodynamics

Neurogenesis dynamics in the olfactory bulb:deciphering circuitry organization, function, and adaptive plasticity

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Neural Regeneration Research 2025年第6期20卷 1565-1581页

作者： moawiah m.Naffaa Department of Psychology and Neuroscience Duke UniversityDurhamNCUSA Department of Cell Biology Duke University School of MedicineDurhamNCUSA

Adult neurogenesis persists after birth in the subventricular zone, with new neurons migrating to the granule cell layer and glomerular layers of the olfactory bulb, where they integrate into existing circuitry as inhibitory interneurons. The generation of these new neurons in the olfactory bulb supports both structural and functional plasticity, aiding in circuit remodeling triggered by memory and learning processes. However, the presence of these neurons, coupled with the cellular diversity within the olfactory bulb, presents an ongoing challenge in understanding its network organization and function. moreover,the continuous integration of new neurons in the olfactory bulb plays a pivotal role in regulating olfactory information processing. This adaptive process responds to changes in epithelial composition and contributes to the formation of olfactory memories by modulating cellular connectivity within the olfactory bulb and interacting intricately with higher-order brain regions. The role of adult neurogenesis in olfactory bulb functions remains a topic of debate. Nevertheless, the functionality of the olfactory bulb is intricately linked to the organization of granule cells around mitral and tufted cells. This organizational pattern significantly impacts output, network behavior, and synaptic plasticity, which are crucial for olfactory perception and memory. Additionally, this organization is further shaped by axon terminals originating from cortical and subcortical regions. Despite the crucial role of olfactory bulb in brain functions and behaviors related to olfaction, these complex and highly interconnected processes have not been comprehensively studied as a whole. Therefore, this manuscript aims to discuss our current understanding and explore how neural plasticity and olfactory neurogenesis contribute to enhancing the adaptability of the olfactory system. These mechanisms are thought to support olfactory learning and memory, potentially through increased

关键词： network adaptability neurogenesis neuronal communication olfactory bulb olfactory learning olfactory memory synaptic plasticity