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Arshad Khan,Dolat Khan,Ilyas Khan,Farhad Ali,Faizan ul Karim,Kottakkaran Sooppy Nisar 한국자기학회 2019 Journal of Magnetics Vol.24 No.2
This paper studies magnetohydrodynamic (MHD) flow of Brinkman type nanofluids with the influence of heat generation, chemical reaction and thermal radiation. The f luid i s taken ov er a v ertical plate flat p assing through a porous medium. Four distinct types of nano particles (Cu, Ag, TiO₂ and Al₂O₃) are taken in a base fluid H₂O. The vertical plate with constant temperature is oscillating in its own plane. The flow is described by the partial deferential equations with suitable initial and boundary conditions. The Laplace transform method is used to obtain the exact solutions for velocity, temperature and concentration. These solutions are interpreted graphically using computational software Mathcad-15 to analyze the influence of embedded parameters such as Brinkman parameter, permeability of porous medium, chemical reaction parameter, nano particle volume fraction, heat generation parameter, magnetic parameter and radiation parameter. Skin-friction, Sherwood number and Nusselt number are calculated mathematically.
Ilyas, Afshan,Ayyub, Mohammad,Khan, M. Rizwan,Husain, Mohammed Aslam,Jain, Abhinandan The Korean Institute of Electrical and Electronic 2018 Transactions on Electrical and Electronic Material Vol.19 No.3
Solar photovoltaic systems have evolved as a prominent renewable source of energy owing to its eco-friendly nature, long lifetime, and low maintenance requirement. However, its conversion efficiency is very low. Different maximum power point tracking (MPPT) techniques have been used to extract maximum power from the photovoltaic system. In this study, the perturb and observe (P&O) MPPT algorithm, which is practically implemented on an Arduino Uno board and simulated in Matlab/Simulink under the same environmental conditions, is used to track the maximum power. Different parameters of a Simulink-based PV module and a practical photovoltaic module are obtained and compared. The main advantages of the P&O MPPT algorithm are its low cost and easy implementation. However, it may fail to track the maximum operating point under varying environmental conditions.
Electrical and thermal properties of a-(Se70Te30)100-χ (Se98Bi2)χ (0≤χ≤20) alloys
ZishanH.Khan,M.Zulfequar,M.Ilyas,M.Husain,Kh.SelimaBegum 한국물리학회 2002 Current Applied Physics Vol.2 No.2
In electrical properties, the dc conductivity and photoconductivity measurements have been made in vacuum evaporated thinlms of a-(Se70Te30)100. x(Se98Bi2)x system, in the temperature range (308355 K). It has been observed that dc conductivity andactivation energy depend on the Bi concentration. Photocurrent dependence on incident radiation has also been observed whichfollow the power law (Iph / Fc). Transient photocurrent exhibits the non-exponential decay time. All these parameters show that theand crystallization temperatures is studied to calculate the activation energy for thermal relaxation and activation energy forcrystallization. The composition dependence of the activation energy for thermal relaxation and activation energy for crystallizationis discussed in terms of the structure of SeTeBi glassy system.. 2002 Elsevier Science B.V. All rights reserved.
Afshan Ilyas,Mohammad Ayyub,M. Rizwan Khan,Mohammed Aslam Husain,Abhinandan Jain 한국전기전자재료학회 2018 Transactions on Electrical and Electronic Material Vol.19 No.3
Solar photovoltaic systems have evolved as a prominent renewable source of energy owing to its eco-friendly nature, longlifetime, and low maintenance requirement. However, its conversion effi ciency is very low. Diff erent maximum power pointtracking (MPPT) techniques have been used to extract maximum power from the photovoltaic system. In this study, theperturb and observe (P&O) MPPT algorithm, which is practically implemented on an Arduino Uno board and simulated inMatlab/Simulink under the same environmental conditions, is used to track the maximum power. Diff erent parameters ofa Simulink-based PV module and a practical photovoltaic module are obtained and compared. The main advantages of theP&O MPPT algorithm are its low cost and easy implementation. However, it may fail to track the maximum operating pointunder varying environmental conditions.
Hamayun, Muhammad,Khan, Sumera Afzal,Khan, Abdul Latif,Rehman, Gauhar,Kim, Youn-Ha,Iqbal, Ilyas,Hussain, Javid,Sohn, Eun-Young,Lee, In-Jung Informa UK (TaylorFrancis) 2010 Mycologia Vol.102 No.5
<P>Gibberellin (GA) production by soil fungi has received little attention, although substantial work has been carried out on other aspects of plant growth promoting fungi (PGPF). In our studies we investigated GA production and growth-promoting capacity of a novel fungal strain isolated from the roots of soil-grown cucumber. Pure cultures of 19 endophytic fungi were tested for shoot length promotion of Waito-C rice to identify the GA production capacity of these fungal isolates. Isolate MH-6 significantly increased shoot length (12.9 cm) of Waito-C, in comparison to control treatments. Bioassay with culture filtrate (CF) of MH-6 also significantly promoted growth attributes of cucumber plants. Analysis of MH-6 CF showed the presence of physiologically active (GA1, 1.97 ng/mL; GA3, 5.18 ng/mL; GA4, 13.35 ng/mL and GA7, 2.4 ng/ mL) in conjunction with physiologically inactive (GA9 [0.69 ng/mL], GA12 [0.24 ng/mL], GA15 [0.68 ng/ mL, GA19 [1.94 ng/mL and GA20 [0.78 ng/mL]) gibberellins. The CF of MH-6 produced greater amounts of GA3, GA4, GA7 and GA19 than wild type Fusarium fujikuroi, a fungus known for high production of GA. The fungal isolate MH-6 was identified as a new strain of Cladosporium sp. on the basis of sequence homology (99%) and phylogenetic analysis of 18S rDNA sequence.</P>
Yasin Muhammad Ilyas,Khan M. I.,Kanwal Shamsa,ALResheedi Dalil Bulayis N.,Fatima Mahvish,Alwadai Norah,Yousef El Sayed,Ihtisham-ul-haq,Iqbal Munawar 한국세라믹학회 2024 한국세라믹학회지 Vol.61 No.4
According to reports, a unique method to improve the efficiency of titanium dioxide (TiO 2) dye-sensitized solar cells (DSSCs) involves inserting foreign ions into the material’s lattice structure before forming the heterostructure. The sol–gel technique has been used to produce films of TiO 2, Cr–TiO 2, TiO 2@Cr–TiO 2, and Cr–TiO 2@TiO 2. A small quantity of rutile phase with the anatase phase was observed in heterostructures, and XRD validated the anatase phase of pure Cr–TiO 2@TiO 2, which contains a large grain size (46 nm). SEM presents numerous well-formed, homogenous grains in the structure of Cr–TiO 2@ TiO 2, providing a large surface area for dye loading in DSSCs. Among all samples, Cr–TiO 2@TiO 2 exhibits a small band gap (Eg) (3.2 eV), and high transmittance in the visible spectrum has been observed by UV–Vis spectroscopy. The Cr–TiO 2@ TiO 2 cell demonstrates high Jsc (7.69 mA-cm −2), Voc (0.79 V), and effi ciency (4.57%). The small recombination resistance, verifi ed from EIS, is responsible for this high efficiency.
Hemodynamic Flow in a Vertical Cylinder with Heat Transfer
Farhad Ali,Anees Imtiaz,Ilyas Khan,Nadeem Ahmad Sheikh,Dennis Ling Chuan Ching 한국자기학회 2018 Journal of Magnetics Vol.23 No.2
In blood, the concentration of red blood cells varies with the arterial diameter. In the case of narrow arteries, red blood cells concentrate around the centre of the artery and there exists a cell-free plasma layer near the arterial wall due to Fahraeus-Lindqvist effect. Due to non-uniformity of the fluid in the narrow arteries, it is preferable to consider the two-phase model of the blood flow. The present article analyzes the heat transfer effects on the two-phase model of the unsteady blood flow when it flows through the stenosed artery under an external pressure gradient. The direction of the artery is assumed to be vertical and the magnetic field is applied along the radial direction of the artery. Blood is considered as a non-Newtonian Casson fluid with uniformly distributed magnetic particles. Both the blood and magnetic particles are moving with distinct velocities. This two-phase problem is modelled using the Caputo-Fabrizio derivative approach and then solved for an exact solution using joint Laplace & Hankel transforms. Effects of pertinent parameters such as Grashoff number, Prandtl number, Casson fluid parameter and fractional parameters, and magnetic field on blood velocity and particle velocity have been shown graphically for both large and small values of time. Both velocity profiles increase with the increase of Grashoff number and Casson fluid parameter and reduce with the increase of magnetic field and Prandtl number. The behaviour of temperature is studied for different values of the fractional parameter.
Naveed Ahmed,Adnan,Umar Khan,Syed Tauseef Mohyud-Din,Ilyas Khan,Kottakkaran Sooppy Nisar 한국자기학회 2020 Journal of Magnetics Vol.25 No.2
The objectives of the research are to explored the heat and mass transport over a paraboloid surface of revolution by taking the effects of Lorentz force, resistive heating and internal heat source. The dimensionless version of the model was attained via similarity transformations. Then, for solution purpose, RK scheme is utilized and performed computations for the flow fields. The influence of different physical quantities on the flow characteristics described comprehensively via graphs. It is examined that the stretching index parameter m opposes the fluid velocity and the temperature enhances for Eckert number. Moreover, significant impacts of the Schmidt number are observed for mass transfer gradient.