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Uniform and Homogeneous Growth of Copper Nanoparticles on Electrophoretically Deposited Carbon Nanotubes Electrode for Nonenzymatic Glucose Sensor

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Acta Metallurgica Sinica(English Letters) 2016年第10期29卷 889-894页

作者： Syeda Ammara Shahzadi Shamaila Rehana Sharif Sheeba Ghani Nosheen zafar Department of Physics University of Engineering and Technology Department of Physics Forman Christian College (A Chartered University)

The multiwalled carbon nanotubes thin-film-based electrode was fabricated by electrophoretic deposition and modified with copper （Cu） nanoparticles to fabricate Cu/CNTs nanocomposite sensor for nonenzymatic glucose detection. The expensive glassy carbon electrode was replaced by fluorine-doped tin oxide glass containing CNTs film to confine the Cu nanoparticles growth by electrodeposition through cyclic voltammetry （CV）. The ultraviolet visible and X-ray diffraction analysis revealed the successful deposition of Cu nanoparticles on the CNTs-modified electrode. The atomic force microscopy images confirrqed the morphology of electrodeposited Cu on CNTs film as uniformly dispersed particles. The electrocatalytic activity of electrode to the glucose oxidation was investigated in alkaline medium by CV and amperometric measurements. The fabricated sensor exhibited a fast response time of less than 5 s and the sensitivity of 314 μA rnM^-1 cm^-2 with linear concentration range （0.02-3.0 mM） having detection limit 10.0 μM. Due to simple preparation of sensor, Cu/CNTs nanocomposite electrodes are a suitable candidate for reliable determination of glucose with good stability.

关键词： Electrophoretic deposition (EPD) Fluorine-doped tin oxide (FTO) substrate Carbon nanotubes Copper nanoparticles Nonenzymatic electrocatalysis Glucose sensor

Mass dependence of pion-induced fission cross sections on the level density parameter

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Chinese Physics C 2012年第9期36卷 831-835页

作者： zafar Yasin Warda Iram M.Ikram Shahzad Physics Division PINSTECHP.O.NiloreIslamabadPakistan Physics Department Islamia UniversityBahawalpurPakistan

Fission probabilities and fission cross sections strongly depend on the mass number of the target and energy of the projectile. In this research work, a cascade-exciton model （using CEM95 computer code） has been implemented to observe the dependence of pion-induced fission cross sections and fission probabilities on the target mass and ratio of the level density parameter in fission to neutron emission. The analysis has been performed for both the positive and negative pions as the projectile at 80, 100 and 150 MeV energies. The computed cross sections satisfactorily reproduced the experimental findings when compared with the available experimental data in the literature. We observed a smooth dependence at 150 MeV, and a sharper dependence at 80 and 100 MeV pion energy, in the fissility region above 29.44.

关键词： CEM95 fission cross section level density parameter

Laboratory scale studies on removal of chromium from industrial wastes

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Journal of Environmental Sciences 2003年第3期15卷 417-422页

作者： M.A.Baig Mohsin Mir Shazad Murtaza zafar I. Bhatti Institute of Environmental Science & Engineering National University of Science & EngineeringInstitute of Environmental Science & Engineering National University of Science & EngineeringInstitute of Environmental Science & Engineering National University of Science & EngineeringInstitute of Environmental Science & Engineering National University of Science & Engineering Rawalpindi PakistanRawalpindi PakistanRawalpindi PakistanRawalpindi Pakistan

Chromium being one of the major toxic pollutants is discharged from electroplating and chrome tanning processes and is also found in the effluents of dyes, paint pigments, manufacturing units etc. Chromium exists in aqueous systems in both trivalent (Cr 3+) and hexavalent (Cr 6+) forms. The hexavalent form is carcinogenic and toxic to aquatic life, whereas Cr 3+ is however comparatively less toxic. This study was undertaken to investigate the total chromium removal from industrial effluents by chemical means in order to achieve the Pakistan NEQS level of 1 mg/L by the methods of reduction and precipitation. The study was conducted in four phases. In phase Ⅰ, the optimum pH and cost effective reducing agent among the four popular commercial chemicals was selected. As a result, pH of 2 was found to be most suitable and sodium meta bisulfate was found to be the most cost effective reducing agent respectively. Phase Ⅱ showed that lower dose of sodium meta bisulfate was sufficient to obtain 100 % efficiency in reducing Cr 6+ to Cr 3+, and it was noted that reaction time had no significance in the whole process. A design curve for reduction process was established which can act as a tool for treatment of industrial effluents. Phase Ⅲ studies indicated the best pH was 8.5 for precipitation of Cr 3+ to chromium hydroxide by using lime. An efficiency of 100 % was achievable and a settling time of 30 minutes produced clear effluent. Finally in Phase Ⅳ actual waste samples from chrome tanning and electroplating industries, when precipitated at pH of 12 gave 100 % efficiency at a settling time of 30 minutes and confirmed that chemical means of reduction and precipitation is a feasible and viable solution for treating chromium wastes from industries.

关键词： tannery waste effluents reduction precipitation efficiency chromium

Bioactive compounds in banana fruits and their health benefits

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Food Quality and Safety 2018年第4期2卷 183-188页

作者： Jiwan S.Sidhu Tasleem A.zafar Department of Food Science&Technology College of Life SciencesKuwait University13060-SafatKuwait

Banana is an edible fruit and is herbaceous flowering plant belonging to the genus Musa and the family *** is also eaten as cooked vegetable(and is then called plantains).All the edible banana fruits are seedless(parthenocarpic)and belong to two main species,Musa acuminata Colla and Musa balbisiana *** hybrid from these two species Musa x paradisiaca *** also available *** banana is native to Indomalaya and Australia,Papua New Guinea was the first to domesticate this *** has now spread to almost 135 countries around the *** per 2016 data,nearly 28 per cent of the total world’s banana production comes from India and *** group banana,being the main export item from the banana-exporting countries,usually refers to soft,sweet,and dessert banana in the Western countries,but the plantain bananas have firm,starchy fruit which is suitable for cooking as a *** is known to be rich not only in carbohydrates,dietary fibres,certain vitamins and minerals,but is also rich in many health-promoting bioactive *** composition including various bioactives and their health contributions has been reviewed in this paper.

关键词： banana fruit nutritional value phytochemicals bioactives phenolics biogenic amines.

Trichosanthes dioica Roxb.: A vegetable with diverse pharmacological properties

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Food Science and Human Wellness 2018年第1期7卷 34-48页

作者： Mahia Khandaker Saleha Akter Mohammad zafar Imam Department of Biotechnology Bangabandhu Sheikh Mujibur Rahman Agricultural UniversitySalnaGazipur 1706Bangladesh Department of Pharmacy Primeasia UniversityHBR Tower9 BananiDhaka 1213Bangladesh Department of Pharmacy Stamford University Bangladesh51 Siddeswari RoadDhaka 1217Bangladesh

Trichosanthes dioica *** a climber of the Cucurbitaceae family mainly found in tropical *** fruit is widely consumed as a vegetable and different parts of this plant are used in the traditional medicine to treat various types of human *** this review,we critically analyzed and presented the scientific studies on *** available in three electronic databases ***,Web of Science and Google *** aim was to find the scientific basis of the traditional use to understand the plant’s potential in *** have found promising antihyperglycemic,antihyperlipidemic,antitumor,cytotoxic,arsenic poisoning ameliorative,anti-inflammatory,antidiarrheal,and varieties of pharmacological activities of *** types of bioactive compounds have been identified and isolated from *** including peptides namely trichosanthin and lectin;a number of triterpenes like cucurbitacin B,euphol,α-amyrin,-amyrin,lupeol,taraxerol,betulin,and karounidiol;sterols,steroidal saponin,tannin,flavonoids *** contains a number of well-known bioactive phytochemicals and the plant has shown an array of pharmacological activities in *** review will expand our understanding of the therapeutic potential of *** and their phytochemical basis which may help in further research on this species.

关键词： Trichosanthes dioica Pointed gourd Cucurbitaceae Ethnomedicine Ethnopharmacology

A Differential Quadrature Based Approach for Volterra Partial Integro-Differential Equation with a Weakly Singular Kernel

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Computer Modeling in Engineering & Sciences 2020年第9期124卷 915-935页

作者： Siraj-ul-Islam Arshed Ali Aqib zafar Iltaf Hussain Department of Basic Sciences and Islamiat University of Engineering and Technology PeshawarKhyber PakhtunkhwaPakistan Department of Mathematics Islamia College PeshawarKhyber PakhtunkhwaPakistan

Differential quadrature method is employed by numerous researchers due to its numerical accuracy and computational efficiency,and is mentioned as potential alternative of conventional numerical *** this paper,a differential quadrature based numerical scheme is developed for solving volterra partial integro-differential equation of second order having a weakly singular *** scheme uses cubic trigonometric B-spline functions to determine the weighting coefficients in the differential quadrature approximation of the second order spatial *** advantage of this approximation is that it reduces the problem to a first order time dependent integro-differential equation(IDE).The proposed scheme is obtained in the form of an algebraic system by reducing the time dependent IDE through unconditionally stable Euler backward method as time *** scheme is validated using a homogeneous and two nonhomogeneous test *** of the system matrix and numerical convergence of the method are analyzed for spatial and temporal domain discretization *** of results of the present approach with Sinc collocation method and quasi-wavelet method are also made.

关键词： Partial integro-differential equation differential quadrature cubic trigonometric B-spline functions weakly singular kernel

An Efficient Energy Aware Routing Mechanism for Wireless Body Area Networks

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Computers, Materials & Continua 2022年第1期70卷 1111-1126页

作者： Wejdan Wasel Aljaghthami Mohammad Haseeb zafar Afraa Zuhair Attiah Faculty of Computing and Information Technology King Abdulaziz UniversityJeddah21589Saudi Arabia

The accelerated development of wireless network technology has resulted in the emergence of Wireless Body Area Network(WBAN),which is a technology commonly used in the medical *** consists of tiny sensor nodes that interconnect with each other and set in the human body to collect and transmit the patient data to the physician,to monitor the patients *** nodes typically have limited battery energy that led to a shortage of network ***,energy efficiency is considered one of the most demanding challenges in routing design for *** proposed routing mechanisms inWBAN did not cover the source node energy and energy harvesting ***,this study proposes an Efficient Energy Aware Routing(EEAR)*** paper constructs a path cost function that considers three parameters:residual energy,number of hops to the sink,and the distance between the ***,data aggregationwith filtration and hybrid energy harvesting technique are used to extend the network lifetime,reduce the network traffic load,andmaintain the source node *** simulations using MATLAB have been performed to evaluate the performance of the proposed *** is contrasted with the two latest schemes,called Priority-based Congestion-avoidance Routing Protocol(PCRP)and Energy Efficient Routing Protocol(EERP).The results show the significant performance of theEEARmechanism in terms of network lifetime,residual energy,network stability,and throughput.

关键词： Wireless body area network routing protocol energy efficiency network lifetime energy harvesting

Morphology and features of Cambrian oncoids and responses to palaeogeography of the North China Platform

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Journal of Palaeogeography 2020年第2期9卷 150-167页

作者： En-Zhao Xiao Ming-Xiang Mei Shu Jiang Tehseen zafar School of Earth Sciences and Resources China University of Geosciences(Beijing)Beijing 100083China Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education and Faculty of Earth Resources China University of Geosciences(Wuhan)Wuhan 430074China Institute of Geochemistry Chinese Academy of SciencesGuiyang 550081China Institute of Geology University of the PunjabLahore 54590Pakistan

The Cambrian strata in the North China Platform are fully exposed. A wide variety of carbonate oncoids with different shapes occur in the Xuzhuang and Zhangxia formations(Miaolingian Series) from six Cambrian sections in the study area. A comprehensive study involving outcrop description, microscopic observation, scanning electron microscopy(SEM), energy dispersive X-ray spectroscopy(EDX), X-ray diffraction(XRD), and carbon and oxygen isotope analysis is conducted to determine the facies, morphology, internal structure, and geochemical properties of the oncoids. The oncoids are divided into six types based on their morphology and internal *** and ultrastructural observations reveal typical microbial fossils(Girvanella) and microbially-related sediments(framboidal pyrite), indicating the biogenicity of the oncoids. Additionally, the XRD and carbon and oxygen isotope analysis results suggest that the formational environments of these oncoids are different due to terrestrial influences. Statistical data on the oncoids from the six sections show that there are obvious differences in the types of oncoids and the proportions of different varieties in each section. The spatial differences in the oncoid morphologies are associated with different palaeogeographic settings. The rough oncoid growth patterns developed in nearshore environments were influenced by terrigenous debris and steep terrain, whereas the delicate oncoid growth patterns developed in offshore environments were less affected by terrestrial factors and were featured by more stable depositional processes related to microbial mats.

关键词： Morphological classification Microbial m at Girvonello Carbon and oxygen isotopes Miaolingian series North China

Mass Transfer of MHD Nanofluid in Presence of Chemical Reaction on A Permeable Rotating Disk with Convective Boundaries, Using Buongiorno’s Model

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Computer Modeling in Engineering & Sciences 2018年第7期116卷 31-49页

作者： Muhammad Shoaib Arif Yasir Nawaz Mairaj Bibi zafar Ali Department of Mathematics Air UniversityPAF Complex E-9Islamabad44000Pakistan Department of Mathematics Comsats UniversityPark Road Chak Shahzad CampusIslamabad44000Pakistan

This communiquéis opted to study the flow of nanofluid because of heated disk rotation subjected to the convective boundaries with chemical reaction of first *** Buongiorno’s model for nanofluids is used due to its wide range of applications and the rotating disk under investigation is *** magneto Reynolds parameter and boundary layer assumptions are carried out to formulate the *** system of nonlinear partial differential equations governing the flow problem is converted into the set of ordinary differential equations by using particular relations known as Von Karman *** complicated set of coupled ordinary differential equations with complicated boundary conditions is set to solve by an analytical technique Homotopy Analysis Method(HAM).Whereby the results obtained by the aforementioned method are provided analytically and analyzed *** validation of the work is confirmed by providing comparison of previous works in tabular *** of chemical reaction parameter on mass transfer rate is also highlighted tabularly for its *** and Sherwood numbers calculated and compared to the like literature and found in good agreement.

关键词： Chemical reaction rotating disk nanoparticles velocity slip magnetic effect.