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Simultaneous effects of MHD and Joule heating on the fundamental flows of a Casson liquid with slip

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Propulsion and Power Research 2021年第2期10卷 118-129页

作者： K.Ramesh Arshad Riaz zahoor ahmad Dar Department of Mathematics Symbiosis Institute of TechnologySymbiosis International(Deemed University)Pune412115India Department of Mathematics Division of Science and TechnologyUniversity of EducationLahore54770Pakistan Department of Mathematics Lovely Professional UniversityJalandhar144411India

Magnetic field plays a significant role in innumerable fields like mechanical,chemical,biological and medical *** examples include power generation systems,magnetohydrodynamic(MHD)accelerators,liquid metal fluids,cooling of nuclear reactors,hightemperature plasmas,chemical processing equipment and electronic *** view of these facts,the current investigation discusses the fundamental flows of a Casson fluid in horizontal parallel plates(three fundamental situations considered such as the plate walls progresses in the conflicting directions,the progress of lower plate in the flow direction and other is in fixed position,and the progress of the plates in the flow direction respectively).Influences of radiation,velocity slip,porous medium and Joule heating are considered into *** flow situation is assumed in Cartesian coordinate *** momentum and energy equations are transformed into non-dimensional system utilizing appropriate nondimensional *** exact solutions of the non-dimensional differential equations have been *** pictorial representations are provided for the velocity as well as temperature characteristics in all the mentioned *** is concluded by graphical approach that velocity is enhanced in the case of increasing Darcy’s parameter and boundary slip while reduced for the large magnetic *** the other hand,it is found that slip factor is reducing the heat transfer rate while magnetic field is giving rise to it.

关键词： Casson fluid Viscous dissipation Joule heating Porous medium Thermal radiation Magnetofluiddynamics

Analysis of the dielectric properties of R410A Gas as an alternative to SF_(6)for high-voltage applications

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High Voltage 2019年第1期4卷 41-48页

作者： Bakhtiar Khan Jawad Saleem Faisal Khan Gul Faraz Rizwan ahmad Naveed Ur Rehman zahoor ahmad Department of Electrical Engineering COMSATS University IslamabadAbbottabad CamusPakistan

Electric power industry is extensively using gas-insulated systems for the transmission and distribution of electrical *** high-voltage technology,the gas insulation is dominated by Sulphur-hexafluoride(SF_(6))since the early *** is a greenhouse gas and has long atmospheric *** paper proposes comparatively more environmental friendly R410 gas as an alternative to SF_(6)for high-voltage *** validate the performance and theoretical concepts,it has been analysed *** gases air and carbon dioxide were mixed with the base gas R410A to reduce the liquification temperature and global warming *** strength of R410A was tested for DC as well as AC voltage,results were compared with that of SF_(6)and other alternatives available in literature,and the results were *** self-recoverability test of R410A was performed and the synergistic effect of the mixed gases was ***,this work has discovered that R410A is the suitable alternative to SF_(6)for high-voltage applications.

关键词： R410A gases high

Alterations in Growth and Yield of Camelina Induced by Different Planting Densities under Water Deficit Stress

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Phyton-International Journal of Experimental Botany 2020年第3期89卷 587-597页

作者： Ejaz ahmad Waraich Zeeshan Ahmed zahoor ahmad Rashid ahmad Murat Erman Fatih Cig Ayman El Sabagh Department of Agronomy University of AgricultureFaisalabad38040Pakistan Institute of Ecology and Geography Chinese Academy of SciencesXinjiang830011China Cele National Station of Observation and Research for Desert-Grassland Ecosystem Institute of Ecology and GeographyChinese Academy of SciencesXinjiang848300China Department of Field Crops Faculty of AgricultureCukurova UniversityAdana1380Turkey Department of Field Crops Faculty of AgricultureSiirt UniversitySiirt56100Turkey Agronomy Department Faculty of AgricultureKafr El Sheikh UniversityKafr Elsheikh33511Egypt

Camelina(Camelina sativa L.)is famous for its oil quality and unique fatty acid *** and yield of crops reduced under water deficit *** threat such as drought or water deficit condition is the emerging problem which creates the negative impact on the growth of *** upon the current situation a pot study was performed in rain out-shelter to explore the effect of different plant densities(15,10 and 5 plants per pot)on growth and seed yield of two camelina genotypes under normal(100%WHC)and water deficit(60%WHC)conditions by using completely randomized design with factorial arrangement having three *** indicated that individual effects of plant densities and water deficit stress levels considerably influenced the growth and seed yield of camelina but interaction effects did not indicate any significant *** values of leaf area index(LAI)and crop growth rate(CGR)were recorded in P_(3) treatment(15 plants per pot).However,maximum values of leaf area duration(LAD),net assimilation rate(NAR),yield and yield components were observed in the treatment P_(1)(5 plants per pot).Water deficit condition(60%WHC)significantly minimized the growth,seed yield(0.82 g/m^(2))and yield components of camelina *** camelina genotypes(611 and 618)did not differ significantly under water deficit conditions.

关键词： Camelina sativa crop growth rate net assimilation rate planting density water stress

Microwave-assisted pre-ionization experiments on GLAST-Ⅲ

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Plasma Science and Technology 2021年第8期23卷 53-61页

作者： Riaz KHAN Sehrish SHAKIR ahmad ALI Muhammad Khawar AYUB Moazzam NAZIR Zia UR-REHMAN Abdul QAYYUM Muhammad Athar NAVEED Sarfraz ahmad zahoor ahmad Rafaqat ALI Shahid HUSSAIN Pakistan Tokamak Plasma Research Institute P.O.NiloreIslamabad 44000Pakistan Theoretical Physics Division PINSTECHP.O.NiloreIslamabad 44000Pakistan

GLAss Spherical Tokamak(GLAST-Ⅲ)is a spherical tokamak with an insulating vacuum vessel that has a unique single-passage capability for incident *** this work,electron cyclotron resonance heating(ECRH)-assisted plasma pre-ionization in GLAST-Ⅲis explored for three radio-frequency(RF)polarizations(the O-,X-,and M-modes)at different toroidal-field(TF)strengths and filled gas *** optimum hydrogen pressure is identified for efficient plasma pre-ionization.A comparison of the plasma pre-ionizations initiated by the O-,X-,and M-modes shows prominent differences in the breakdown time,location,and wave *** the case of O-mode polarization,microwave absorption occurs for a relatively shorter duration,resulting in a bell-shaped electron-temperature(Te)temporal *** absorption is dominant in the case of the X-mode,leading to a broader Te temporal *** M-mode discharge contains features of both the X-and *** plasma pre-ionization is achieved in the X-mode polarization for the intermediate TF strengths(with a central toroidal magnetic field B0=0.075 T).Traces of the electron-number density show a similar tendency,as revealed by *** results suggest that the X-mode is the best candidate for efficient plasma pre-ionization at low filled gas pressures(10-2 Pa)in small tokamaks.

关键词： GLAST-Ⅲ microwave ECRH pre-ionization polarization

Enhancing Drought Tolerance in Wheat through Improving Morpho- Physiological and Antioxidants Activities of Plants by the Supplementation of Foliar Silicon

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Phyton-International Journal of Experimental Botany 2020年第3期89卷 529-539页

作者： zahoor ahmad Ejaz ahmad Waraich Celaleddin Barutçular Akbar Hossain Murat Erman Fatih CIG Hany Gharib Ayman EL Sabagh Department of Field Crops Faculty of AgricultureUniversity of CukurovaAdana1380Turkey Department of Agronomy University of Agriculture FaisalabadPunjab7800Pakistan Bangladesh Wheat and Maize Research Institute Dinajpur5200Bangladesh Department of Field crops Faculty of AgricultureSiirt UniversitySiirt56100Turkey Department of Agronomy Faculty of AgricultureUniversity of KafrelsheikhKafr el-sheikh33516Egypt

The main objective of the research is to assess the role of foliar application of silicon(Si)for enhancing the survival ability of wheat under drought stress through improving its morphology,physicochemical and antioxidants *** were five doses of Si at the rate of 2,4,6 and 8 mM and a *** completion of seeds germination,pots were divided into four distinct groups at various field capacity(FC)levels,such as 100%FC(well-irrigated condition),75%FC(slight water deficit),50%FC(modest water deficit)and 25%FC(severe water deficit stress condition).Foliar application of Si at the rate of 2,4,6 and 8 mM and a control were given after 30 days of sowing at the tillering stage of *** of the present investigation indicated that increasing the level of water deficit stress reduced the morphological parameters(such as root and shoot fresh and dry-biomass weight)and physico-biochemical events((such as chlorophyll contents by estimating SPAD value),total free amino acid(TFAA),total soluble sugar(TSS),total soluble protein(TSP),total proline(TP),CAT(catalase),POD(peroxidase),SOD(superoxide dismutase)and APX(ascorbate peroxidase))of wheat;while foliar application of Si at 6 mM at tillering stage enhanced the drought tolerance in wheat by increasing morphology and physiochemical characters under all levels of drought ***,antioxidants activities in wheat also enhanced by the application of Si at 6 mM under normal as well as all drought stress ***-fore,it may be concluded that foliar application of Si at 6 mM at the tillering stage of wheat is an important indication for increasing the drought tolerance by improving the morphology,physico-biochemical and antioxidants activities in plants under deficit water(drought)conditions.

关键词： Foliar silicon drought tolerance morphology physiochemical antioxidants wheat

Wi-Fi: WPA2 Security Vulnerability and Solutions

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Wireless Engineering and Technology 2021年第2期12卷 15-22页

作者： zahoor ahmad Najar Roohe Naaz Mir Deaprtment of IT Central University of Kashmir Srinagar India Department of Computer Science and Engineering National Institute of Technology Srinagar India

The Internet of Things (IoT) is an emerging network infrastructure with more than five devices owned by a single user. Wireless connectivity forms the backbone of such infrastructure. IoT uses diverse wireless communication technologies such as IEEE 802.15.4, Wi-Fi, Zigbee, Bluetooth, RFID, BLE (Bluetooth Low Energy), and various other cellular technologies. Wi-Fi is most suitable for IoT Home or office networks. Practically wireless signals do not adhere to the boundaries of the office or home, or organization and impose inherent security risks like information leakage, unauthorized access, other security and privacy threats to networking infrastructure. Therefore Authorization/Association of devices is one of the main security concerns. This paper discusses how unauthorized access to wireless networks (Wi-Fi) can be secured by improving existing WPA2 protocol security.

关键词： Wi-Fi WPA2 SHA-512 IoT

Foliar Application of Phosphorus Enhances Photosynthesis and Biochemical Characteristics of Maize under Drought Stress

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Phyton-International Journal of Experimental Botany 2021年第2期90卷 503-514页

作者： zahoor ahmad Ejaz ahmad Waraich Muhammad Zia ur Rehman Muhammad Ashar Ayub Muhammad Usman Hesham Alharby Atif Bamagoos Celaleddin Barutçular Muhammad Ali Raza FatihÇiğ Ayman El Sabagh Department of Field Crops Faculty of AgricultureÇukurova UniversityAdana01330Turkey Department of Botany University of Central Punjab(UCP)Punjab Group of CollegesBahawalpur63100Pakistan Department of Agronomy University of AgricultureFaisalabad38000Pakistan Institute of Soil and Environmental Science University of AgricultureFaisalabad38000Pakistan Department of Biological Sciences Faculty of ScienceKing Abdulaziz UniversityJeddah21577Saudi Arabia College of Agronomy Sichuan Agricultural UniversityChengdu611130China Department of Field Crops Faculty of AgricultureSiirt UniversitySiirt56100Turkey Department of Agronomy Faculty of AgricultureUniversity of KafrelsheikhKafrelsheikh33516Egypt

Water is essential for the growth period of crops;however,water unavailability badly affects the growth and physiological attributes of crops,which considerably reduced the yield and yield components in ***,a pot experiment was conducted to investigate the effect of foliar phosphorus(P)on morphological,gas exchange,biochemical traits,and phosphorus use efficiency(PUE)of maize(Zea mays L.)hybrids grown under normal as well as water deficit situations at the Department of Agronomy,University of Agriculture Faisalabad,Pakistan in *** different treatments(control and P@8 kg ha^(−1))and four hybrids(Hycorn,31P41,65625,and 32B33)of maize were tested by using a randomized complete block design(RCBD)with three *** showed that the water stress caused a remarkable decline in total soluble protein(9.7%),photosynthetic rate(9.4%)and transpiration rate(13.4%),stomatal conductance(10.2%),and internal CO_(2)rate(20.4%)comparative to well-watered *** increase of 37.1%,36.8%,and 24.5%were recorded for proline,total soluble sugar,and total free amino acid,***,foliar P application minimized the negative impact of drought by improving plant growth,physio-biochemical attributes,and PUE in maize plants under water stress *** the hybrids tested,the hybrid 6525 performed better both under stress and non-stress *** outcomes confirmed that the exogenous application of P improved drought stress tolerance by modulating growth,physio-biochemical attributes,and PUE of maize hybrids.

关键词： Photosynthetic attributes biochemical characters water stress foliar P Maize

基于FPGA的VSC-HVDC实时仿真模型

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基于FPGA的VSC-HVDC实时仿真模型

作者： zahoor ahmad 华北电力大学(北京)

学位级别：硕士

Novel Adder Circuits Based On Quantum-Dot Cellular Automata (QCA)

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Circuits and Systems 2014年第6期5卷 142-152页

作者： Firdous ahmad Ghulam Mohiuddin Bhat Peer zahoor ahmad Department of Computer Science University of Kashmir (J&K) India Department of Electronics & IT University of Kashmir (J&K) India

Quantum-dot cellular automaton (QCA) is a novel nanotechnology that provides a very different computation platform than traditional CMOS, in which polarization of electrons indicates the digital information. This paper demonstrates designing combinational circuits based on quantum-dot cellular automata (QCA) nanotechnology, which offers a way to implement logic and all interconnections with only one homogeneous layer of cells. In this paper, the authors have proposed a novel design of XOR gate. This model proves designing capabilities of combinational circuits that are compatible with QCA gates within nano-scale. Novel adder circuits such as half adders, full adders, which avoid the fore, mentioned noise paths, crossovers by careful clocking organization, have been proposed. Experiment results show that the performance of proposed designs is more efficient than conventional designs. The modular layouts are verified with the freely available QCA Designer tool.

关键词： Novel Adder Circuits Based on Quantum-Dot Cellular Automata (QCA)