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Biomedical and Environmental Sciences 2020年第11期33卷 882-886页

作者： Sania Naz Muhammad Majid Muhammad Zia department of biotechnology quaid-i-azam university islamabad pakistan 45320 department of Pharmacy quaid-i-azam university islamabad pakistan 45320

The exploitation of nanotechnology has increased in all ramifications due to the spectacular potential of nano-products(NPs).Among the nanoproducts,iron oxide(Fe2 O3)NPs has attracted more scientific attentions due it... 详细信息

关键词： characteristics. iron Oxide

Decoding molecular mechanisms:brain aging and Alzheimer's disease

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Neural Regeneration Research 2025年第8期20卷 2279-2299页

作者： Mahnoor Hayat Rafay Ali Syed Hammad Qaiser Mohammad Uzair Khalid Al-Regaiey Roaa Khallaf Lubna Abdullah Mohammed Albassam imdad Kaleem Xueyi Wang Ran Wang Mehwish SBhatti Shahid Bashir Atta-ur-Rahman School of Applied Biosciences(ASAB) National University of Sciences and Technology(NUST)IslamabadPakistan department of biotechnology Quaid-i-Azam UniversityIslamabadPakistan department of Biological Sciences Faculty of Basic&Applied SciencesInternational Islamic University Islamabad(IIUI)IslamabadPakistan department of Bioengineering King Fahd University of Petroleum and MineralsDhahranSaudi Arabia department of Physiology College of MedicineKing Saud UniversityRiyadhSaudi Arabia department of Neurology Neuroscience CenterKing Fahad Specialist HospitalDammamSaudi Arabia department of Mental Health Neuroscience CenterKing Fahad Specialist HospitalDammamSaudi Arabia department of Biosciences Commission on Science and Technology for Sustainable Development in the South(COMSATS University)IslamabadPakistan department of Psychiatry The First Hospital of Hebei Medical UniversityShijiazhuangHebei ProvinceChina Mental Health institute of Hebei Medical university ShijiazhuangHebei ProvinceChina department of Neurobiology and Behavior University of CaliforniaIrvineCAUSA Neuroscience Center King Fahad Specialist Hospital DammamDammamSaudi Arabia

The complex morphological,anatomical,physiological,and chemical mechanisms within the aging brain have been the hot topic of research for *** aging process alters the brain structure that affects functions and cognitions,but the worsening of such processes contributes to the pathogenesis of neurodegenerative disorders,such as Alzheimer's *** these observable,mild morphological shifts,significant functional modifications in neurotransmission and neuronal activity critically influence the aging *** these changes is important for maintaining cognitive health,especially given the increasing prevalence of age-related conditions that affect *** review aims to explore the age-induced changes in brain plasticity and molecular processes,differentiating normal aging from the pathogenesis of Alzheimer's disease,thereby providing insights into predicting the risk of dementia,particularly Alzheimer's disease.

关键词： Alzheimer’s disease brain aging cognitive health dementia molecular mechanisms neuronal activity neuroplasticity neurotransmission

Biomathematical study of time-dependent flow of a Carreau nanofluid through inclined catheterized arteries with overlapping stenosis

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Journal of Central South university 2017年第11期24卷 2725-2744页

作者： Ashfaq Ahmed Sohail Nadeem department of Mathematics Quaid-I-Azam UniversityIslamabad 45320Pakistan

This work is concerned with the analysis of blood flow through inclined catheterized arteries having a balloon(angioplasty) with time-variant overlapping stenosis. The nature of blood in small arteries is analyzed mathematically by considering it as a Carreau nanofluid. The highly nonlinear momentum equations of nanofluid model are simplified by considering the mild stenosis case. The formulated problem is solved by a homotopy perturbation expansion in terms of a variant of the Weissenberg number to obtain explicit forms for the axial velocity, the stream function, the pressure gradient, the resistance impedance and the wall shear stress distribution. These solutions depend on the Brownian motion number, thermophoresis number, local temperature Grashof number G_r and local nanoparticle Grash of number B_r. The results were also studied for various values of the physical parameters, such as the Weissenberg number W_i, the power law index n, the taper angle φ, the maximum height of stenosis δ~*, the angle of inclination α, the maximum height of balloon σ~*, the axial displacement of the balloon z_d~*,the flow rate F and the Froud number Fr. The obtained results show that the transmission of axial velocity curves through a Newtonian fluid(Wi=0, n=1, Gr=0, Br=0, Nt=0, Nb≠0) is substantially lower than that through a Carreau nanofluid near the wall of balloon while the inverse occurs in the region between the balloon and stenosis. The streamlines have a clearly distinguished shifting toward the stenotic region and this shifting appears near the wall of the balloon, while it has almost disappeared near the stenotic wall and the trapping bolus in the case of horizontal arteries and Newtonian fluid(Wi=0, n=1, Gr=0, Br=0, Nt=0, Nb≠0) does not appear but for the case of Carreau nanofluid bolus appears.

关键词： overlapping stenosed artery nanofluid Grashof number Brownian motion thermophoresis pharmacology

Low Energy Plasma Focus as an intense X-ray Source for Radiography

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Plasma Science and Technology 2004年第3期6卷 2296-2300页

作者： S.Hussain M.Zakaullah Shujaat Ali A.Waheed department of Physics quaid-i-azam university 45320 islamabad PakistanDepartment of Physics Quaid-i-Azam University 45320 Islamabad PakistanDepartment of Physics Quaid-i-Azam University 45320 Islamabad PakistanPINSTECH P. O. Box 2151 44000 Islamabad Pakistan

Study on X-ray emission from a low energy (1.8 kJ) plasma focus devicepowered by a 9 μF capacitor bank, charged at 20 kV and giving peak discharge current of about 175kA by using a lead-inserted copper-tapered anode is reported. The X-ray yield in different energywindows is measured as a function of hydrogen filling pressure. The maximum yield in 4π-geometry isfound to be (27.3+-1.1) J and corresponding wall plug efficiency for X-ray generation is 1.52+-0.06%. X-ray emission, presumably due to bombarding activity of electrons in current sheath at theanode tip was dominant, which is confirmed by the pinhole images. The feasibility of the device asan intense X-ray source for radiography is demonstrated.

关键词： plasma focus X-ray source radiography

Nanocellulose isolation characterization and applications:a journey from non-remedial to biomedical claims

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Bio-Design and Manufacturing 2019年第3期2卷 187-212页

作者： Sania Naz Joham S.Ali Muhammad Zia department of biotechnology Quaid-i-Azam University IslamabadIslamabadPakistan

Cellulose is a renewable,biodegradable,ecofriendly and sustainable *** market of nanocellulose is comprehensively very high due to its *** of nanocellulose from bacteria and plant results in different morphology and size of ***,mechanical strength,biofabrication,crystallinity,high surface area per unit mass,hydrophilicity,porosity,transparency and non-toxicity of bacterial cellulose make it more *** extravagant nanoscaled three-dimensional network of cellulosic structures possess extraordinary properties for biomedical application,evidencing its usage in skin therapy,cardiovascular implants,cartilage meniscus implants,tissue engineering,bone tissue and neural implants,wound care products,drug delivery agents,tablet modification,tissue engineered urinary conduits,and synthesis of artificial *** due to potential benefits associated with nanocellulose effective and efficient techniques are required for the isolation of nanocellulose that should be economical,ecofriendly and non-toxic.

关键词： Nanocellulose Plant and bacterial source Extraction Applications

Decoherence and Multipartite Entanglement of Non-inertial Observers

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Chinese Physics Letters 2012年第2期29卷 17-20页

作者： M.Ramzan department of Physics Quaid-i-Azam UniversityIslamabad 45320Pakistan

The decoherence effect on multipartite entanglement in non-inertial frames is *** GHZ state is considered to be shared between partners with one partner in the inertial frame whereas the other two are in accelerated ***-tangle and π-tangles are used to quantify the entanglement of the multipartite system influenced by phase damping and phase flip *** is seen that for the phase damping channel,entanglement sudden death (ESD) occurs for p > 0.5 in the infinite acceleration *** the other hand,in the case of the phase flip channel,ESD behavior occurs at p =*** is also seen that entanglement sudden birth (ESB) occurs in the case of phase flip channel just after ESD,i.e.p > ***,it is seen that the effect of the environment on multipartite entanglement is much stronger than that of the acceleration of non-inertial frames.

关键词： frames acceleration infinite

Dynamics of Fermionic Geometric Discord beyond Single-Mode Approximations

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Chinese Physics Letters 2013年第6期30卷 34-37页

作者： M.Ramzan department of Physics Quaid-i-Azam UniversityIslamabad 45320Pakistan

Geometric quantum discord of fermionic systems in the relativistic regime,that is,beyond the single-mode approximation,is *** is shown that geometric quantum discord for the fermionic systems in non-inertial frames converges at an infinite acceleration limit,which means that the fermionic systems become independent of the choice of Unruh modes(qR)beyond single-mode *** discord may vanish or be retained depending upon the level of mixedness of the fermionic *** dynamics of geometric discord are investigated under amplitude damping,depolarizing,phase damping and flipping *** vanishing behavior of discord is seen for a higher level of decoherence in the infinite acceleration *** depolarizing channel dominantly affects the fermionic geometric discord as compared to the amplitude and phase damping *** implies that the depolarizing channel has most destructive influence on the discord of the fermionic ***,the flipping channels have a symmetrical effect on the ***,the discord heavily depends on the mixedness parameter of the quantum state of the fermionic systems in accelerated frames beyond single-mode approximation.

关键词： quantum infinite frames

Quantum Stackelberg Duopoly in a Noninertial Frame

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Chinese Physics Letters 2011年第7期28卷 5-8页

作者： Salman Khan M.Khalid Khan department of Physics Quaid-i-Azam UniversityIslamabad 45320Pakistan

We study the influence of the Unruh effect on quantum Stackelberg *** is shown that the acceleration of a noninertial frame strongly affects the payoffs of the *** validation of the subgame perfect Nash equilibrium is limited to a particular range of acceleration of the noninertial *** benefit of the initial state entanglement in the quantum form of the duopoly in the inertial frame is adversely affected by the *** duopoly can become a follower advantage only in a small region of the acceleration.

关键词： acceleration Stackelberg Quantum

Multiparty Quantum Cryptographic Protocol

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Chinese Physics Letters 2008年第10期25卷 3543-3546页

作者： M. Ramzan M. K. Khan department of Physics quaid-i-azam university islamabad 45320 Pakistan

We propose a multiparty quantum cryptographic protocol. Unitary operators applied by Bob and Charlie, on their respective qubits of a tripartite entangled state encoding a classical symbol that can be decoded at Alice＇s end with the help of a decoding matrix. Eve＇s presence can be detected by the disturbance of the decoding matrix. Our protocol is secure against intercept resend attacks. Furthermore, it is eifficient and deterministic in the sense that two classical bits can be transferred per entangled pair of qubits. it is worth mentioning that in this protocol, the same symbol can be used for key distribution and Eve＇s detection that enhances the etfficiency of the protocol.

关键词： the power-law exponents precipitation durative abrupt precipitation change

Analytic homotopy solution of generalized three-dimensional channel flow due to uniform stretching of the plate

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Acta Mechanica Sinica 2007年第5期23卷 503-510页

作者： AhmerMehmood AsifAli department of Mathematics Quaid-i-Azam University45320Islamabad 44000Pakistan

in this communication a generalized three- dimensional steady flow of a viscous fluid between two infinite parallel plates is considered. The flow is generated due to uniform stretching of the lower plate in x- and y-directions. it is assumed that the upper plate is uniformly porous and is subjected to constant injection. The governing system is fully coupled and nonlinear in nature. A complete analytic solution which is uniformly valid for all values of the dimensionless parameters β Re and λ is obtained by using a purely analytic technique, namely the homotopy analysis method. Also the effects of the parameters β Re and λ on the velocity field are discussed through graphs.

关键词： Generalized three-dimensional flow Viscous fluid Stretching sheet Channel flow Homotopy analysis method