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Unique Outcomes of Internal Heat Generation and Thermal Deposition on Viscous Dissipative Transport of Viscoplastic Fluid over a Riga-Plate

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Communications in Theoretical Physics 2018年第1期69卷 68-76页

作者： Z.Iqbal Ehtsham azhar Zaffar Mehmood E.N.Maraj Department of Mathematics Faculty of Sciences HITEC University

Boundary layer stagnation point flow of Casson fluid over a Riga plate of variable thickness is investigated in present article. Riga plate is an electromagnetic actuator consists of enduring magnets and gyrated aligned array of alternating electrodes mounted on a plane surface. Physical problem is modeled and simplified under appropriate transformations. Effects of thermal radiation and viscous dissipation are incorporated. These differential equations are solved by Keller Box Scheme using MATLAB. Comparison is given with shooting techniques along with RangeKutta Fehlberg method of order 5. Graphical and tabulated analysis is drawn. The results reveal that Eckert number,radiation and fluid parameters enhance temperature whereas they contribute in lowering rate of heat transfer. The numerical outcomes of present analysis depicts that Keller Box Method is capable and consistent to solve proposed nonlinear problem with high accuracy.

关键词：液体粘滞运输消散 MATLAB 板可变厚度飞机表面

Systematic study of Ce^(3+) on the structural and magnetic properties of Cu nanosized ferrites for potential applications

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Journal of Rare Earths 2018年第2期36卷 156-164页

作者： Majid Niaz Akhtar A.B.Sulong M.N.Akhtar Muhammad azhar Khan Department of Physics Muhammad Nawaz Sharif University of Engineering and Technology (MNSUET) Department of Mechanical and Materials Engineering Faculty of Engineering and Built Environment Universiti Kebangsaan Malaysia (UKM) Institute of Pure and Applied Biology Department of ZoologyBahaudin Zakariya University Department of Physics The Islamia University of Bahawalpur

Ce^（3＋） substituted Cu-spinel nanoferrites CuCe_xFe_（2-x）O_4（x=0.00, 0.02, 0.04, 0.06, 0.08 and 0.10） were synthesized via sol-gel self-combustion hybrid route. Single phase spinel ferrite of Cu nanoferrites were examined using X-ray diffraction（XRD） analysis whereas the multiphase structure was observed as Ce contents increased from x=0.06. Field emission scanning electron microscopy（FESEM）, Thermogravimetric and differential thermal analysis（TGA and DTA） and Fourier transform infrared spectroscopy（FTIR） were used to find out the morphology phase and metal stretching vibrations of Ce^（3＋） substituted nanocrystalline ferrites. The crystallite size was increased and found in the range of 25-91 nm. The agglomerations in Cu ferrite samples increase as the Ce^（3＋） concentration increases. The magnetic properties such as remanence, saturation magnetization, coercivity, Bohr magneton and magnetocrystalline anisotropy constant（K） were determined using M-H loops recorded from a vibrating sample magnetometer（VSM）. Saturation magnetization, remanence and coercivity are increased as the Ce^（3＋）contents increase in Cu nanocrystalline samples. Moreover, law of approach to saturation（LoA） was used to calculate the maximum value of saturation for Ce-doped Cu nanoferrites. The soft magnetic behaviour of the Cu nanoferrite is observed as compared to the samples substituted with the increased Ce contents in Cu nanocrystalline ferrite. Bohr magneton and magnetocrystalline anisotropy are found to increase with the substitution of rare earth Ce^（3＋） contents in Cu spinel nanocrystalline ferrite. Cedoped Cu nanocrystalline ferrites with excellent properties may be suitable for potential applications in sensing, security, switching, core, multilayer chip inductor, biomedical and microwave absorption applications.

关键词： Ce-doped Cu nanocrystalline ferrites X-ray diffraction(XRD) Scanning electron microscopy(SEM) Transmission electron microscopy(TEM) Fourier transform infrared(FTIR) Vibrating sample magnetometer(VSM)

Two-Dimensional Materials in Large-Areas: Synthesis, Properties and Applications

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Nano-Micro Letters 2020年第5期12卷 119-152页

作者： Ali Zavabeti Azmira Jannat Li Zhong azhar Ali Haidry Zhengjun Yao Jian Zhen Ou College of Materials Science and Technology Nanjing University of Aeronautics and AstronauticsNanjing 211100People’s Republic of China Department of Chemical Engineering The University of MelbourneParkvilleVIC 3010Australia School of Engineering RMIT UniversityMelbourneVIC 3000Australia

Large-area and high-quality two-dimensional crystals are the basis for the development of the next-generation electronic and optical *** synthesis of two-dimensional materials in wafer scales is the first critical step for future technology uptake by the industries;however,currently presented as a significant *** efforts have been devoted to producing atomically thin two-dimensional materials with large lateral dimensions,controllable and uniform thicknesses,large crystal domains and minimum *** this review,recent advances in synthetic routes to obtain high-quality two-dimensional crystals with lateral sizes exceeding a hundred micrometres are *** of the achieved large-area two-dimensional crystals in electronics and optoelectronics are summarised,and advantages and disadvantages of each approach considering ease of the synthesis,defects,grain sizes and uniformity are discussed.

关键词： Two-dimensional materials Large-area Electronics Optoelectronics Defect engineering

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软弱泥质砂岩地层中输水隧洞稳定性研究

岩土力学 2022年第S2期43卷 626-639页

作者： Muhammad Usman azhar 周辉杨凡杰高阳朱勇路新景房后国耿轶君中国科学院武汉岩土力学研究所岩土力学和工程国家重点实验室湖北武汉430071 中国科学院大学北京100049 黄河工程咨询有限公司河南郑州450003

泥质砂岩属于黏土岩,具有典型的遇水软化特征。在泥质砂岩富水地层中进行隧道开挖是地下工程的一个挑战性问题。研究了围岩软化与未软化条件下泥质砂岩地层中输水隧洞的稳定性和支护时间。首先,介绍了泥质砂岩遇水软化的力学试验结果;然... 详细信息

泥质砂岩属于黏土岩,具有典型的遇水软化特征。在泥质砂岩富水地层中进行隧道开挖是地下工程的一个挑战性问题。研究了围岩软化与未软化条件下泥质砂岩地层中输水隧洞的稳定性和支护时间。首先,介绍了泥质砂岩遇水软化的力学试验结果;然后,采用基于Hoek-Brown强度准则的岩体参数评价方法,评估泥质砂岩在围岩软化与未软化条件下的力学参数;再后,以兰州水源地引水隧洞为依托工程,采用数值模拟方法对泥质砂岩隧洞软化与未软化工况的围岩稳定性进行了计算分析,得出泥质砂岩遇水软化对隧洞安全性存在显著影响;最后,采用位移收敛法,研究了泥质砂岩软化与未软化工况中,保障隧洞施工安全的合理支护时机。研究表明,泥质砂岩未软化工况中,可考虑隧道围岩初期支护在距掌子面4~5m位置实施;而在泥质砂岩遇水软化工况中,初期支护建议在掌子面开挖后立刻支护。研究成果可为泥质砂岩地层隧洞的安全施工提供依据。

关键词：泥质砂岩遇水软化隧洞稳定性数值分析收敛约束法支护时机

Disintegration of uncertainties associated with real-time multi-satellite precipitation products in diverse topographic and climatic area in Pakistan

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Journal of Mountain Science 2021年第3期18卷 716-734页

作者： Muhammad MASOOD Ghulam NABI Muhammad BABUR Aftab Hussain azhar Muhammad KALEEM ULLAH Centre of Excellence in Water Resources Engineering University of Engineering&Technology GT-RoadLahore 54890Pakistan Civil Engineering Department University of Central PunjabLahore 54782Pakistan Directorate of Hydrology Pakistan Water&Power Development Authority(WAPDA)MDO-WAPDAMangla Dam10200Pakistan Civil Engineering Department University of LahoreLahore 54000Pakistan

Satellite-based Precipitation Estimates(SPEs)have gained importance due to enhanced spatial and temporal resolution,particularly in Indus basin,where raingauge network has fewer observation stations and drainage area is laying in many *** of SPEs is based on indirect mechanism,therefore,assessment and correction of associated uncertainties is *** the present study,disintegration of uncertainties associated with four prominent real time SPEs,IMERG,TMPA,CMORPH and PERSIANN has been conducted at grid level,regional scale,and summarized in terms of regions as well as whole study area *** bias has been disintegrated into hit,missed,false biases,and Root Mean Square Error(RMSE)into systematic and random errors.A comparison among gauge-and satellite-based precipitation estimates at annual scale,showed promising result,encouraging use of real time SPEs in the study *** grid basis,at daily scale,from box plots,the median values of total bias(-0.5 to 0.5 mm)of the used SPEs were also encouraging although some under/over estimations were noted in terms of hit bias(-0.15 to 0.05 mm/day).Relatively higher values of missed(0.3 to 0.5 mm/day)and false(0.5 to 0.7 mm/day)biases were *** detected average daily RMSE,systematic errors,and random errors were also comparatively ***-scale spatial distribution of uncertainties revealed lower values of uncertainties in plain areas,depicting the better performance of satellite-based products in these ***,in areas of high altitude(>4000 m),due to complex topography and climatic conditions(orographic precipitation and glaciated peaks)higher values of biases and errors were *** barriers and point scale gauge data could also be a cause of poor performance of SPEs in these areas,where precipitation is more on ridges and less in valleys where gauge stations are usually *** system’s size and intensity can also be a reason of higher biases,because M

关键词： Satellite precipitation Real-time Error characterization IMERG Indus Basin

A Numerical Investigation of Nanocomposite of Copper and Titanium Dioxide in Water Based Fluid Influenced by Instigated Magnetic Region

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Communications in Theoretical Physics 2018年第8期69卷 239-248页

作者： Z.Iqbal Ehtsham azhar E.N.Maraj Zaffar Mehmood Department of Mathematics Faculty of Sciences HITEC University

Presence of external electrical field plays a vital role in heat transfer and fluid flow phenomena. Keeping this in view present article is a numerical investigation of stagnation point flow of water based nanoparticles suspended fluid under the influence of induced magnetic field. A detailed comparative analysis has been performed by considering Copper and Titanium dioxide nanoparticles. Utilization of similarity analysis leads to a simplified system of coupled nonlinear differential equations, which has been tackled numerically by means of shooting technique followed by Runge-Kutta of order 5. The solutions are computed correct up to 6 decimal places. Influence of pertinent parameters is examined for fluid flow, induced magnetic field, and temperature profile. One of the key findings includes that magnetic parameter plays a vital role in directing fluid flow and lowering temperature profile. Moreover, it is concluded that Cu-water based nanofluid high thermal conductivity contributes in enhancing heat transfer efficiently.

关键词：液体流动二氧化物水基 Runge-Kutta 磁性钛铜流动现象

High HbA1c is associated with higher risk of ischaemic stroke in Pakistani population without diabetes

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Stroke & Vascular Neurology 2016年第3期1卷 133-139页

作者： Ali Zohair Nomani sumaira Nabi Shahzad Ahmed Mansoor Iqbal Haris Majid Rajput Suhail Rao Department of Neurology Pakistan institute of Medical SciencesIslamabadPakistan

Context:The role of glycated haemoglobin(HbA1c)in the prediction of ischaemic stroke in individuals without diabetes is ***:We performed a study to analyse the role of HbA1c in the risk prediction of ischaemic stroke in Pakistani population without *** further studied the difference between HbA1c values of individuals with diabetes and without diabetes with *** and design:Single centre,case–*** and methods:In phase I,a total of 233 patients without diabetes with ischaemic stroke and 245 as controls were *** of HbA1c levels,lipid profiles and blood pressure recordings with ischaemic stroke was *** phase II,comparison was done between diabetics and nondiabetics with *** analysis:Comparison of the mean variables was performed with Student’s *** regression analysis with ischaemic stroke as the dependent variable was performed for phase ***:In phase I,the ischaemic stroke group had significantly higher HbA1c levels(5.9±2.9%vs 5.5±1.6%)compared with controls(p0.05).Conclusions:Higher HbA1c indicated a significantly increased risk for ischaemic *** HbA1c value above 5.6%(prediabetic range)predicted future risk of stroke and efforts to maintain glucose level within the normal range(≤5.6%)in individuals with high cardiovascular risk are important.

关键词： diabetes cholesterol cardiovascular

Lithium-ion full cell with high energy density using nickel-rich LiNi_(0.8)Co_(0.1)Mn_(0.1)O_2 cathode and SiO-C composite anode

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International Journal of Minerals,Metallurgy and Materials 2018年第12期25卷 1473-1481页

作者： azhar Iqbal Long Chen Yong Chen Yu-xian Gao Fang Chen Dao-cong Li Institute of Engineering Research Hefei Guoxuan High-Tech Power Energy CO. Ltd

A high-energy-density Li-ion battery with excellent rate capability and long cycle life was fabricated with a Ni-rich layered LiNi_(0.8)Co_(0.1)Mn_(0.1)O_2 cathode and Si O-C composite anode. The LiNi_(0.8)Co_(0.1)Mn_(0.1)O_2 and Si O-C exhibited excellent electrochemical performance in both half and full cells. Specifically, when integrated into a full cell configuration, a high energy density(280 Wh·kg^(-1)) with excellent rate capability and long cycle life was attained. At 0.5 C, the full cell retained 80% of its initial capacity after 200 charge/discharge cycles, and 60% after 600 cycles, indicating robust structural tolerance for the repeated insertion/extraction of Li^+ ions. The rate performance showed that, at high rate of 1 C and 2 C, 96.8% and 93% of the initial capacity were retained, respectively. The results demonstrate strong potential for the development of high energy density Li-ion batteries for practical applications.

关键词： high energy density full cell rate performance high capacity cathode

The Perspective of Covid-19 Vaccines: What Needs to Be Known and Its Expected Effect on the Human Population?

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Journal of Biosciences and Medicines 2022年第10期10卷 34-46页

作者： Syahrul Tuba Widyati Syed azhar Syed Sulaiman Anggi Khairina Hanum Hasibuan Faculty of Military Pharmacy The Republic of Indonesia Défense University Sentul Indonesia Clinical Pharmacy School of Pharmaceutical Science University Sains Malaysia Pulau Pinang Malaysia Faculty of Mathematics and Natural Science Chemistry Department The Republic of Indonesia Défense University Sentul Indonesia

Background: The COVID-19 pandemic is a devastating blow to the entire world community and changes the order of human life. Purpose: All efforts and strategies are being carried out to contain and reduce the spread of the SARS-CoV-2 virus by tightening the health protocol and using vaccines for the public. Currently, several vaccines are available and have passed phase 3 clinical trials, such as vector vaccines (Gamaleya Sputnik V Russia, University of Oxford/AstraZeneca, CanSino, and Janssen Pharmaceutical Companies), mRNA-based vaccines (Moderna/BioNTech/Fosun Pharma/Pfizer), inactivated vaccines (Sinovac and Sinopharm from China, Covaxin from Bharat Biotech India) and adjuvanted recombinant protein nanoparticles (Novavax from the USA), which are expected to be able to suppress the spread of the virus and produce a minimum of 70% herd immunity in a population. This study uses a narrative review from reputable publications and is closely related to the topic. Result: Each vaccine’s efficacy varies from the lowest, namely, the Sinovac vaccine (CoronaVac) 50%, to the highest the Novavax vaccine (NVX-Cov2373) 96% effectivity value. However, further rigorous research is still being carried out to develop an effective and efficient vaccine. Health workers are the last bastion to handle COVID-19 patients. Conclusion: The primary purpose of the present immunization is to prevent and minimize the spread of COVID-19. At this time, the availability of a variety of vaccines is expected to provide strategic answers to the pandemic scenario that has afflicted countries all over the world.

关键词： Vaccine Development and Manufacturing COVID-19 SARS-COV-2 Vaccine