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Some exact solutions of the oscillatory motion of a generalized second grade fluid in an annular region of two cylinders

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Acta mechanica Sinica 2010年第4期26卷 541-550页

作者： A.mahmood C.Fetecau N.A.Khan m.jamil Department of mathematics COMSATS Institute of Information Technology Department of mathematics Technical University of Iasi Department of mathematics University of Karachi Abdus Salam School of mathematical Sciences GC University

The velocity field and the associated shear stress corresponding to the longitudinal oscillatory flow of a generalized second grade fluid, between two infinite coaxial circular cylinders, are determined by means of the Laplace and Hankel transforms. Initially, the fluid and cylinders are at rest and at t = 0＋ both cylinders suddenly begin to oscillate along their common axis with simple harmonic motions having angular frequencies Ω1 and Ω2. The solutions that have been obtained are presented under integral and series forms in terms of the generalized G and R functions and satisfy the governing differential equation and all imposed initial and boundary conditions. The respective solutions for the motion between the cylinders, when one of them is at rest, can be obtained from our general solutions. Furthermore, the corresponding solutions for the similar flow of ordinary second grade fluid and Newtonian fluid are also obtained as limiting cases of our general solutions. At the end, the effect of different parameters on the flow of ordinary second grade and generalized second grade fluid are investigated graphically by plotting velocity profiles.

关键词： Generalized second grade fluid Velocity field Shear stress Longitudinal oscillatory flow Laplace and Hankel transforms

A simulation study of the e^+/e^- sensitivity of a low resistive phosphate glass electrode in a RPC using GEANT mC

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Chinese Physics C 2010年第3期34卷 359-362页

作者： m.jamil J.T.Rhee Y.J.Jeon Institute for Advanced Physics Department of Physics Konkuk University Liquid Crystal Research Center Konkuk University

The resistivity of conventional glass is quite high and is unacceptable in a high rate environment. Low resistive glass-electrodes could be a solution for this problem. The present study reports the e^＋/e^- simulation results of an RPC detector made from low resistive phosphate glass electrodes. The detailed geometrical configuration of the content materials which are the essential components of the glass of the RPC detector have been created with the GEANT4 simulation code. Two different types of particle sources, i.e. for e^＋/e^- , have been located on the detectors surface to evaluate the performance of the phosphate glass RPC. Both of the particles have been simulated as a function of their respective energies in the range of 0.1 meV 1.0 GeV. The present simulation work has shown that the resistive electrode plays an important role for the particle production in the RPC configuration.

关键词： monte Carlo simulation resistive plate chamber GEANT4 simulation

Effects of Catalysis and Separator Functionalization on High-Energy Lithium–Sulfur Batteries:A Complete Review

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Energy & Environmental materials 2023年第3期6卷 333-355页

作者： muhammad Kashif aslam Sidra jamil Shahid Hussain maowen Xu Key Laboratory of Luminescence Analysis and molecular Sensing(Southwest University) Ministry of EducationSchool of Materials and EnergySouthwest UniversityChongqing 400715China School of materials Science and Engineering Jiangsu UniversityZhenjiang 212013China

Lithium–sulfur(Li-S)batteries have the advantages of high theoretical specific capacity(1675 mAh g^(−1)),rich sulfur resources,low production cost,and friendly environment,which makes it one of the most promising next-generation rechargeable energy storage ***,the“shuttle effect”of polysulfide results in the passivation of metal lithium anode,the decrease of battery capacity and coulombic efficiency,and the deterioration of cycle *** realize the commercialization of Li-S batteries,its serious“shuttle effect”needs to be *** commercial separators are ineffective to suppress this effect because of its large pore ***,it is an effective strategy to modify the separator surface and introduce functional modified *** addition to the blocking strategy,the catalysis of polysulfide conversion reaction is also an important factor hindering the migration of *** this review,the principles of separator modification,functionalization,and catalysis in Li-S batteries are ***,the research trend of separator functionalization and polysulfide catalysis in the future is prospected.

关键词： catalysis Li-S batteries polysulfides separator functionalization shuttle effect

Effects of AG1 and AG2 QTLs on Nonstructural Carbohydrate and Seed management Options for Rice Seedling Growth and Establishment under Flooding Stress

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Rice science 2020年第6期27卷 515-528页

作者： Satyen mONDAL m.jamil Hasan Tofayel Ahmed m.Giashuddin miah Pompe C.Sta Cruz Abdel m.ISmAIL International Rice Research Institute DAPO Box 7777Metro Manilathe Philippines Bangladesh Rice Research Institute Gazipur 1701Bangladesh University of the Philippines Los Banos CollegeLaguna 4031the Philippines Bangabandhu Sheikh mujibur Rahman Agricultural University Gazipur 1706Bangladesh

Rice(Oryza sativa)plants acquired excess photosynthates in the form of nonstructural carbohydrates(NSCs)in their stems and *** keen interest in rice NSC,the dynamics of NSC accumulation,translocation and re-accumulation have not yet been well ***1 and AG2 QTLs associated with flooding tolerance through catalyzing starch into soluble sugar in germinating *** we conducted three experiments,greenhouse and field to lay the groundwork for large-scale diversity studies on grain NSC and some agronomic traits under direct-seeded rice(DSR)system,using elite lines incorporating AG1,AG2 and AG1-AG2 QTLs into the popular varieties PSB Rc82 and Ciherang-Sub1 along with the donors Kho Hlan On(AG1)and ma-Zhan Red(AG2).In germinating seedlings,soluble sugars increased,while starch concentration decreased gradually especially in the tolerant checks and AG1-AG2 introgression lines under flooded *** sugar accumulation in stem started to increase from the vegetative stage and peaked at the panicle initiation stage then gradually decreased towards the maturity *** Sub1-AG lines had higher sugar and starch concentrations at different growth stages than other genotypes in wet season 2016 and dry season *** survival rate was positively correlated with the stem NSC at the early vegetative stage(21 days after sowing),and stem NSC was positively associated with plant height at different growth *** the tested seeding rate,the most suitable seeding rate,4 g/m2 with shallow burial depth(0.5 cm),resulted in better seedling establishment,relatively higher seedling vigor index and higher leaf area index under flooding in DSR *** of AG1-AG2 QTLs had no any negative impact on nonstructural carbohydrate,germination rate,and growth and biomass production.

关键词： anaerobic germination crop establishment direct-seeded rice flooding nonstructural carbohydrate seeding rate seeding depth

Structural and optical properties of thermally reduced graphene oxide for energy devices

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Chinese Physics B 2017年第8期26卷 346-352页

作者： Ayesha jamil Faiza mustafa Samia aslam Usman Arshad muhammad Ashfaq Ahmad Department of Physics COMSATS Institute of Information TechnologyLahore 54000Pakistan

Natural intercalation of the graphite oxide, obtained as a product of Hummer＇s method, via ultra-sonication of water dispersed graphite oxide has been carried out to obtain graphene oxide（GO） and thermally reduced graphene oxide（RGO）.Here we report the effect of metallic nitrate on the oxidation properties of graphite and then formation of metallic oxide（mO） composites with GO and RGO for the first time. We observed a change in the efficiency of the oxidation process as we replaced the conventionally used sodium nitrate with that of nickel nitrate Ni（NO_3）_2, cadmium nitrate Cd（NO_3）_2,and zinc nitrate Zn（NO_3）_2. The structural properties were investigated by x-ray diffraction and observed the successful formation of composite of mO–GO and mO–RGO（m = Zn, Cd, Ni）. We sought to study the effect on the oxidation process through optical characterization via UV-Vis spectroscopy and Fourier Transform Infrared（FTIR） ***, Thermo Gravimetric Analysis（TGA） was carried out to confirm 〉 90% weight loss in each process thus proving the reliability of the oxidation cycles. We have found that the nature of the oxidation process of graphite powder and its optical and electrochemical characteristics can be tuned by replacing the sodium nitrate（NaNO_3） by other metallic nitrates as Cd（NO_3）_2, Ni（NO_3）_2, and Zn（NO_3）_2. On the basis of obtained results, the synthesized GO and RGO may be expected as a promising material in antibacterial activity and in electrodes fabrication for energy devices such as solar cell, fuel cell,and super capacitors.

关键词： thermal properties of graphene oxide and reduced graphene oxide optical properties structuralproperties fuel cell composite materials

Analysis of b→cτν¯_(τ)anomalies using weak effective Hamiltonian with complex couplings and their impact on various physical observables

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Chinese Physics C 2024年第8期48卷 56-75页

作者： muhammad Arslan Tahira Yasmeen Saba Shafaq Ishtiaq Ahmed muhammad jamil aslam Department of Physics Quaid-i-Azam UniversityIslamabad 45320Pakistan Department of Physics International Islamic UniversityIslamabad 44000Pakistan National Center for Physics Islamabad 44000Pakistan

Recently,the experimental measurements of the branching ratios and different polarization asymmetries for processes occurring through flavor-changing-charged current(b→cτν¯_(τ))transitions by BABAR,Belle,and LHCb have revealed some significant differences from the corresponding Standard model(Sm)*** has triggered an interest to search for physics beyond the Sm in the context of various new physics(NP)models and using the model-independent weak effective Hamiltonian(WEH).Assuming left-handed neutrinos,we add the dimension-six vector,(pseudo-)scalar,and tensor operators with complex Wilson coefficients(WCs)to the Sm *** 60%,30%,and 10%constraints resulting from the branching ratio of B_(c)→τν¯_(τ),we reassess the parametric space of these new physics WCs accommodating the current anomalies based on the most recent HFLAV data of R_(τ/μ,e)(D)and R_(τ/μ,e)(D^(*))and Belle data of F_(L)(D^(*))and P_(τ)(D^(*)).We find that the allowed parametric region of left-handed scalar couplings strongly depends on the constraints of the B_(c)→τν¯_(τ)branching ratio,and the maximum pull from the Sm predictions results from themetric region changes significantly if we extend the analysis by adding LHCb data of R_(τ/μ)(J/ψ)and R_(τ/ℓ)(Λ_(c)).Furthermore,due to the large uncertainties in the measurements of R_(τ/μ)(J/ψ)and R_(τ/ℓ)(X_(c)),we derive the sum rules which complement them with R_(τ/μ,e)(D)and R_(τ/μ,e)(D^(*)).Using the best-fit points of the new complex WCs along with the latest measurements of R_(τ/μ,e)(D(^(*))),we predict the numerical values of the observable R_(τ/ℓ)(Λ_(c)),R_(τ/μ)(J/ψ),and R_(τ/ℓ)(X_(c))from the sum *** simultaneous dependence of abovementioned physical observables on the NP WCs is established by plotting their correlation with R_(D) and R_(D^(*)),which are useful to discriminate between various NP *** find that the most significant impact of NP results from the WC C^(S)_(L)=4C^(T).Fi

关键词： B meson anomalies new physics complex coupling HFLAV

Enhancing pharmaceutical potential and oral bioavailability of Allium cepa nanosuspension in male albino rats using response surface methodology

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Asian Pacific Journal of Tropical Biomedicine 2022年第1期12卷 26-38页

作者： Fatiqa Zafar Nazish Jahan Shaukat Ali Saba jamil Riaz Hussain Saba aslam Department of Chemistry University of SahiwalSahiwalPakistan Department of Chemistry University of AgricultureFaisalabadPakistan Department of Chemistry University of OkaraOkaraPakistan Govt.Graduate College for Women Sargodha RoadFaisalabadPakistan

Objective:To enhance the pharmaceutical potential and oral bioavailability of quercetin contents of Allium cepa peel extract by novel nanosuspension ***:Nanoprecipitation approach was successfully used for the formulation of *** obtain pharmaceutical-grade nanosuspension with minimum particle size and polydispersity index,sodium lauryl sulphate was selected as a *** formulation parameters were statistically optimized by the response surface methodology *** optimized nanosuspension was subjected to stability and in vitro dissolution testing and characterized by scanning electron microscopy,atomic force microscopy,Fourier transform infrared spectroscopy,and zeta *** evaluate the preeminence of nanosuspension over coarse suspension,comparative bioavailability studies were carried out in male albino *** pharmaceutical potential of developed nanosuspension was evaluated by antioxidant,antimicrobial,and toxicity ***:The optimized nanosuspension showed an average particle size of 275.5 nm with a polydispersity index and zeta potential value of 0.415 and−48.8 mV,*** force microscopy revealed that the average particle size of nanosuspension was below 100 *** formulated nanosuspension showed better stability under refrigerated *** showed an improved dissolution rate and a 2.14-fold greater plasma concentration of quercetin than coarse ***,the formulated nanosuspension exhibited enhanced antioxidant and antimicrobial potential and was ***:Optimization of nanosuspension effectively improves the pharmaceutical potential and oral bioavailability of Allium cepa extract.

关键词： Allium cepa Nanoprecipitation Pharmaceutical potential Particle size Polydispersity index Stability Toxicity Quercetin

Accretion onto the magnetically Charged Regular Black Hole

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Chinese Physics Letters 2017年第7期34卷 38-40页

作者： m.Azam A.aslam Division of Science and Technology University of Education Lahore 54590 Pakistan

We investigate the accretion process for static spherically symmetric geometry, i.e., magnetically charged regular black hole with isotropic fluid. W＇e obtain generalized expressions for the velocity （u（r））, speed of sound （cs2）, energy density （ρ（r）） and accretion rate （m） at the critical point near the regular black hole during the accretion process. We also plot these physical parameters against fixed values of charge, mass and different values of equation of state parameter to study the process of accretion. We find that radial velocity and energy density of the fluid remain positive and negative as well as rate of change of mass is increased and decreased for dust, stiff, quintessence fluid and phantom-like fluid, respectively.

关键词： Accretion onto the magnetically Charged Regular Black Hole

An Improved Perturb and Observe maximum Power Point Tracking Algorithm for Photovoltaic Power Systems

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Journal of modern Power Systems and Clean Energy 2023年第4期11卷 1165-1175页

作者： Rasool Kahani mohsin jamil m.Tariq Iqbal Department of Electrical and Computer Engineering Memorial University of NewfoundlandSt.John’sA1B 3X5Canada

This paper aims to improve the performance of the conventional perturb and observe(P&O)maximum power point tracking(mPPT)*** the oscillation around the maximum power point(mPP)is the main disadvantage of this technique,we introduce a modified P&O algorithm to conquer this *** new algorithm recognizes approaching the peak of the photovoltaic(PV)array power curve and prevents the oscillation around the *** key to achieve this goal is testing the change of output power in each cycle and comparing it with the change in array terminal power of the previous *** a decrease in array terminal power is observed after an increase in the previous cycle or in the opposite direction,an increase in array terminal power is observed after a decrease in the previous cycle;it means we are at the peak of the power curve,so the duty cycle of the boost converter should remain the same as the previous ***,an optimized duty cycle is introduced,which is adjusted based on the operating point of PV ***,a DC-DC boost converter powered by a PV array simulator is used to test the proposed *** the irradiance changes,the proposed algorithm produces an averageηmPPT of nearly 3.1%greater than that of the conventional P&O algorithm and the incremental conductance(In C)*** addition,under strong partial shading conditions and drift avoidance tests,the proposed algorithm produces an averageηmPPT of nearly 9%and 8%greater than that of the conventional algorithms,respectively.

关键词： Photovoltaic system maximum power point tracking(mPPT) perturb and observe(P&O) boost converter steady-state performance