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Multifunctional MXene/Carbon Nanotube Janus Film for Electromagnetic Shielding and Infrared Shielding/Detection in Harsh Environments

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Nano-Micro Letters 2024年第10期16卷 543-560页

作者： tufail hassan Aamir Iqbal Byungkwon Yoo Jun Young Jo Nilufer Cakmakci Shabbir Madad Naqvi Hyerim Kim Sungmin Jung Noushad Hussain Ujala Zafar Soo Yeong Cho Seunghwan Jeong Jaewoo Kim Jung Min Oh Sangwoon Park Youngjin Jeong Chong Min Koo School of Advanced Materials Science and Engineering Sungkyunkwan UniversitySeobu-ro 2066Jangan-guSuwon-siGyeonggi-do 16419Republic of Korea Department of Materials Science and Engineering Soongsil UniversitySeoul 06978Republic of Korea Institute of Advanced Composite Materials Korea Institute of Science and Technology92 Chudong-roBongdong-eupWanju-gunJeollabuk-do 55324Republic of Korea R&D Center INNOMXENE Co. Ltd.Daejeon 34365Republic of Korea School of Chemical Engineering Sungkyunkwan UniversitySeobu-ro 2066Jangan-guSuwon-siGyeonggi-do 16419Republic of Korea

Multifunctional,flexible,and robust thin films capable of operating in demanding harsh temperature environments are crucial for various cutting-edge *** study presents a multifunctional Janus film integrating highly-crystalline Ti_(3)C_(2)T_(x) MXene and mechanically-robust carbon nanotube(CNT)film through strong hydrogen *** hybrid film not only exhibits high electrical conductivity(4250 S cm^(-1)),but also demonstrates robust mechanical strength and durability in both extremely low and high temperature environments,showing exceptional resistance to thermal *** hybrid Janus film of 15μm thickness reveals remarkable multifunctionality,including efficient electromagnetic shielding effectiveness of 72 dB in X band frequency range,excellent infrared(IR)shielding capability with an average emissivity of 0.09(a minimal value of 0.02),superior thermal camouflage performance over a wide temperature range(−1 to 300℃)achieving a notable reduction in the radiated temperature by 243℃ against a background temperature of 300℃,and outstanding IR detection capability characterized by a 44%increase in resistance when exposed to 250 W IR *** multifunctional MXene/CNT Janus film offers a feasible solution for electromagnetic shielding and IR shielding/detection under challenging conditions.

关键词： MXene/carbon nanotube Janus film Electromagnetic interference shielding Infrared shielding Thermal camouflage Infrared detection

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Processing investigation and optimization for hybrid thermoplastic composites

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Journal of University of Science and Technology Beijing 2007年第2期14卷 185-189页

作者： M tufail Department of Industrial & Manufacturing Engineering NED University of Engineering & Technology Karachi Pakistan

A thermoplastic based composite material is suitable for automobile and aerospace applications. The recyclability of thermoplastic and clean processing further enhance its use. The only limitation encountered in using this material is its high-melt viscosity. Various techniques have been developed to overcome this problem. Commingled materials are one of such methods adopted for making proper use of thermoplastic. A major problem observed during the use of a commingled material is its de-commingling, wherein, the uniform distribution of fiber and thermoplastic yam gets disturbed and affects the final quality of the composite. The effects of the braiding process on laminate quality were investigated. Flat plaques were produced by braiding the commingled yam, using a 48- carrier braiding machine. The braids （and control woven samples） were subsequently heated and consolidated in a nonisothermal compression molding operation. Prior to the manufacture of the ＇best quality＇ plaques, a series of moldings were produced under different consolidation conditions, to study the dependence of properties on the process variables. This enabled a processing window to be established for each material and helped to separate the respective effects of yam handling, textile processing, and consolidation on laminate properties.

关键词： polypropylene commingled yam braiding consolidation

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Gain-Enhanced Metamaterial Based Antenna for 5G Communication Standards

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Computers, Materials & Continua 2020年第9期64卷 1587-1599页

作者： Daniyal Ali Sehrai Fazal Muhammad Saad hassan Kiani Ziaul Haq Abbas Muhammad tufail Sunghwan Kim Department of Electrical Engineering City University of Science and Information TechnologyPeshawar25000Pakistan Faculty of Electrical Engineering Ghulam Ishaq Khan Institute of Engineering Sciences and TechnologyTopi23640Pakistan Department of Mechatronics Engineering University of Engineering and TechnologyPeshawar25000Pakistan School of Electrical Engineering University of UlsanUlsan44610Korea

Metamaterial surfaces play a vital role to achieve the surface waves suppression and in-phase reflection,in order to improve the antenna *** this paper,the performance comparison of a fifth generation(5G)antenna design is analyzed and compared with a metamaterial-based antenna for 5G communication system *** surface is utilized as a reflector due to its in-phase reflection characteristic and high-impedance nature to improve the gain of an *** conventional conducting ground plane does not give enough surface waves suppression which affects the antenna performance in terms of efficiency and gain *** factors are well considered in this work and improved by using the metamaterial *** radiating element of the proposed metamaterial based antenna is made up of copper material which is backed by the substrate,i.e.,Rogers-4003 with a standard thickness,loss tangent and a relative permittivity of 1.524 mm,0.0027 and 3.55,*** proposed antenna with and without metamaterial surface operates at the central frequency of 3.32 GHz and 3.60 GHz,*** traditional antenna yields a boresight gain of 2.76 dB which is further improved to 6.26 dB,using the metamaterial *** radiation efficiency of the proposed metamaterial-based 5G antenna is above 85%at the desired central frequency.

关键词： Metamaterial surface in-phase reflection 5G high gain

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V-Shaped Monopole Antenna with Chichena Itzia Inspired Defected Ground Structure for UWB Applications

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Computers, Materials & Continua 2020年第10期65卷 19-32页

作者： Naeem Ahmad Jan Saad hassan Kiani Fazal Muhammad Daniyal Ali Sehrai Amjad Iqbal Muhammad tufail Sunghwan Kim Department of Electrical Engineering Iqra National UniversityPeshawar25000Pakistan Department of Electrical Engineering City University of Science and Information TechnologyPeshawar25000Pakistan Department of Electrical Engineering Multimedia UniversityCyberjaya63100Malaysia Department of Mechatronics Engineering University of Engineering and TechnologyPeshawar25000Pakistan Department of Electrical Engineering University of UlsanUlsan44610Korea

Due to rapid growth in wireless communication technology,higher bandwidth requirement for advance telecommunication systems,capable of operating on two or higher bands with higher channel capacities and minimum distortion losses is *** this paper,a compact Ultra-Wideband(UWB)V-shaped monopole antenna is *** response is achieved by modifying the ground plane with Chichen Itzia inspired rectangular staircase *** proposed V-shaped is designed by incorporating a rectangle,and an inverted isosceles triangle using FR4 *** size of the antenna is 25 mm×26 mm×1.6 *** proposed V-shaped monopole antenna produces bandwidth response of 3 GHz Industrial,Scientific,and Medical(ISM),Worldwide Interoperability for Microwave Access(WiMAX),(IEEE 802.11/HIPERLAN band,5G sub 6 GHz)which with an additional square cut amplified the bandwidth response up to 8 GHz ranging from 3.1 GHz to 10.6 GHz attaining UWB defined by Federal Communications Commission(FCC)with a maximum gain of 3.83 *** antenna is designed in Ansys *** for key performance parameters of the antenna are *** measured results are in good agreement with the simulated *** to flat gain,uniform group delay,omni directional radiation pattern characteristics and well-matched impedance,the proposed antenna is suitable for WiMAX,ISM and heterogeneous wireless systems.

关键词： V-shape monopole gain staircase ultra-wideband omni-directional defected ground structure

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Lump and travelling wave solutions of a(3+1)-dimensional nonlinear evolution equation

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Journal of Ocean Engineering and Science 2024年第2期9卷 164-172页

作者： Kalim U.Tariq Raja Nadir tufail Department of Mathematics Mirpur University of Science and TechnologyMirpurAJK 10250Pakistan

In this paper,the(3+1)-dimensional nonlinear evolution equation is studied *** bilinear form of given model is achieved by using the Hirota bilinear *** a result,the lump waves and col-lisions between lumps and periodic waves,the collision among lump wave and single,double-kink soliton solutions as well as the collision between lump,periodic,and single,double-kink soliton solutions for the given model are ***,some new traveling wave solutions are developed by applying the exp(−φ(ξ))expansion *** 3D,2D and contours plots are drawn to demonstrate the nature of the nonlinear model for setting appropriate set of *** a result,a collection of bright,dark,periodic,rational function and elliptic function solutions are *** applied strategies appear to be more powerful and efficient approaches to construct some new traveling wave structures for various contemporary models of recent era.

关键词： The Hirota bilinear method Lump wave solution Travelling wave solution Exp(−φ(ξ))expansion technique

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An age-structured model of the human papillomavirus dynamics and optimal vaccine control

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International Journal of Biomathematics 2017年第6期10卷 183-200页

作者： Mo'tassem Al-Arydah tufail Malik Department of General Education Khalifa University of Science and Technology Masdar Institute Masdar City P. O. Box 54224 Abu Dhabi UAE Department of Mathematics Khalifa University of Science and Technology P. O. Box 127788 Abu Dhabi UAE Department of Science and MathematicsArizona State University Mesa AZ 85212 USA

We formulate an age-structured model based on a system of nonlinear partial differen- tial equations to assist the early and catch up female vaccination programs for human papillomavirus （HPV） types 6 and 11. Since these HPV types do not induce permanent immunity, the model, which stratifies the population based on age and gender, has a susceptible-infectious-susceptible （SIS） structure. We calculate the effective reproduction number Rv for the model and describe the local-asymptotic stability of the disease-free equilibrium using Rv. We prove the existence of an endemic equilibrium for Rv 〉 1 for the no vaccine case. However, analysis of the model for the vaccine case reveals that it undergoes the phenomenon of backward bifurcation. To support our theoretical results, we estimate the age and time solution with the given data for Toronto population, when an early and catch up female vaccine program is adopted, and when there is no vaccine. We show that early and catch up female vaccine program eliminates the infection in both male and female populations over a period of 30 years. Finally, we introduce the optimal control to an age-dependent model based on ordinary differential equations and solve it numerically to obtain the most cost-effective method for introducing the catch up vaccine into the population.

关键词： Human papillomavirus age dependence mathematical model cervical can-cer vaccine.

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Design of Solid Electrolytes with Fast Ion Transport:Computation-Driven and Practical Approaches

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Energy Material Advances 2023年第1期4卷 77-111页

作者： Muhammad Khurram tufail Pengbo Zhai Mengyang Jia Ning Zhao Xiangxin Guo College of Physics Qingdao University266071 QingdaoChina College of Materials Science and Engineering Qingdao University266071 QingdaoChina

For next-generation all-solid-state metal batteries,the computation can lead to the discovery of new solid electrolytes with increased ionic conductivity and excellent *** on computational predictions,a new proposed solid electrolyte with a flat energy landscape and fast ion migration is synthesized using traditional synthesis *** the promise of the predicted solid electrolyte candidates,conventional synthetic methods are frequently hampered by extensive optimization procedures and overpriced raw *** is impossible to rationally develop novel superionic conductors without a comprehensive understanding of ion migration *** this review,we cover ion migration mechanisms and all emerging computational approaches that can be applied to explore ion conduction in inorganic *** general illustrations of sulfide and oxide electrolyte structures as well as their fundamental features,including ion migration paths,dimensionalities,defects,and ion occupancies,are systematically *** major challenges to designing the solid electrolyte and their solving strategies are highlighted,such as lattice softness,polarizability,and structural *** addition to an overview of recent findings,we propose a computational and experimental approach for designing high-performance solid *** review article will contribute to a practical understanding of ion conduction,designing,rapid optimization,and screening of advanced solid electrolytes in order to eliminate liquid electrolytes.

关键词： designing electrolyte conduction

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Alow-cost Zeolite from Coal Fly Ash for Sr and Cs Removal from Polluted Seawater

Alow-cost Zeolite from Coal Fly Ash for Sr and Cs Removal fr...

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作者： tufail Muhammad 西南科技大学

学位级别：硕士

随着社会经济和工业发展,粉煤灰的无序堆放对环境污染越来越严重,其对大气、土壤、地下水的污染对人类的健康也造成了一定的威胁。利用粉煤灰作为合成沸石分子筛的原材料,不仅可以为被锶、铯等污染的海水吸附净化提供一种价格低廉、性...

随着社会经济和工业发展,粉煤灰的无序堆放对环境污染越来越严重,其对大气、土壤、地下水的污染对人类的健康也造成了一定的威胁。利用粉煤灰作为合成沸石分子筛的原材料,不仅可以为被锶、铯等污染的海水吸附净化提供一种价格低廉、性能良好的吸附剂,同时也实现了粉煤灰以废治废的资源化利用,有助于减轻粉煤灰造成的环境问题。本文以内蒙古托克托县大唐国际粉煤灰为主要原料,采用碱熔融水热法制备沸石分子筛,研究了合成过程中碱灰比、陈化时间、水热晶化温度、水热晶化时间等试验条件对合成产物的影响,并对试验合成的产物进行了表征。扫描电镜(SEM)可观察到产物中属于粉煤灰中的球状、钝角状、不规则碎屑状颗粒基本消失,合成产物具有N-1型沸石、Na-P1型、方钠石、方沸石典型结构,形状规则,轮廓清晰,分散度较好;X射线衍射(XRD)图谱表明,合成产物具有N-1型沸石、Na-P1型、方钠石、方沸石较强的衍射峰,表明由粉煤灰在适当的试验条件下成功的合成了混合相分子筛。选取含有Cs+、Sr2+的模拟污染海水为处理目标,研究制备的混合相沸石分子筛对Cs+、Sr2+的吸附性能。初步探讨了 Cs+、Sr2+离子浓度、pH、吸附时间、吸附剂投加量等因素对吸附效果的影响,通过原子吸收光谱(AAS)、原子发射光谱(ICP)对吸附后的残留的Cs+、Sr2+进行测定。结果表明:吸附pH为6.0,温度为25℃条件下混合相沸石分子筛和模拟污染海水共静置吸附24h对Cs+、Sr2+去除率效果较好。因此,采用碱熔融水热法制备的沸石分子筛对含有Cs+、Sr2+的受污染海水具有较好的处理效果,在减少环境污染问题的同时也具有良好的潜在工业应用价值。

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Molecular and functional characterization of the American cockroach, Periplaneta americana, Rab5： the first exopterygotan low molecular weight ovarian GTPase during oogenesis

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Insect Science 2018年第5期25卷 751-764页

作者： Mohamed Elmogy Amr A. Mohamed Muhammad tufail Tomohide Uno Makio Takeda Department of Entomology Faculty of Science Cairo University Orman Giza Egypt Department of Plant Protection College of Food and Agriculture Sciences King Saud University Riyadh Saudi Arabia Graduate School of Agricultural Science Kobe University Nada- ku Kobe Japan Laboratory of Biological Chemistry Faculty of Agriculture Department of Biofuncfional Chemistry Kobe University Nada-ku Hyogo Japan

The small Rab GTPases are key regulators of membrane vesicle trafficking. Ovaries of Periplaneta americana （Linnaeus）（Blattodea： Blattidae） have small molecular weight GTP/ATP-binding proteins during early and late vitellogenic periods of oogenesis. However, the identification and characterization of the detected proteins have not been yet reported. Herein, we cloned a cDNA encoding Rab5 from the American cockroach, P. americana, ovaries （PamRab5）. It comprises 796 bp, encoding a protein of 213 amino acid residues with a predicted molecular weight of 23.5 kDa. PamRab5 exists as a single-copy gene in the P. americana genome, as revealed by Southern blot analysis. An approximate 2.6 kb ovarian mRNA was transcribed especially at high levels in the previtellogenic ovaries, detected by Northern blot analysis. The muscle and head tissues also showed high levels of PamRab5 transcript. PamRab5 protein was localized, via immunofluorescence labeling, to germline-derived cells of the oocytes, very early during oocyte differentiation. Immunoblotting detected a ~25 kDa signal as a membrane-associated form revealed after application of detergent in the extraction buffer, and 23 kDa as a cytosolic form consistent with the predicted molecular weight from amino acid sequence in different tissues including ovary, muscles and head. The PamRab5 during late vitellogenic periods is required to regulate the endocytotic machinery during oogenesis in this cockroach. This is the first report on Rab5 from a hemimetabolan, and presents an inaugural step in probing the molecular premises of insect oocyte endocytotic trafficking important for oogenesis and embryonic development.

关键词： endocytosis membrane trafficking oogenesis Periplaneta americana Rab5-GTPase

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Live Migration of Virtual Machines Using a Mamdani Fuzzy Inference System

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Computers, Materials & Continua 2022年第5期71卷 3019-3033页

作者： Tahir Alyas Iqra Javed Abdallah Namoun Ali tufail Sami Alshmrany Nadia Tabassum Department of Computer Science Lahore Garrison UniversityLahore54000Pakistan Faculty of Computer and Information Systems Islamic University of MadinahMadinah42351Saudi Arabia Department of Computer Science Virtual University of PakistanLahore54000Pakistan

Efforts were exerted to enhance the live virtual machines(VMs)migration,including performance improvements of the live migration of services to the *** VMs empower the cloud users to store relevant data and ***,the utilization of servers has increased significantly because of the virtualization of computer systems,leading to a rise in power consumption and storage requirements by data centers,and thereby the running *** center migration technologies are used to reduce risk,minimize downtime,and streamline and accelerate the data center move ***,several parameters,such as non-network overheads and downtime adjustment,may impact the live migration time and server downtime to a large *** virtualizing the network resources,the infrastructure as a service(IaaS)can be used dynamically to allocate the bandwidth to services and monitor the network flow *** to the large amount of filthy retransmission,existing live migration systems still suffer from extensive downtime and significant performance degradation in crossdata-center *** study aims to minimize the energy consumption by restricting the VMs migration and switching off the guests depending on a threshold,thereby boosting the residual network bandwidth in the data center with a minimal breach of the service level agreement(SLA).In this research,we analyzed and evaluated the findings observed through simulating different parameters,like availability,downtime,and outage of VMs in data center *** new paradigm is composed of two forms of detection strategies in the live migration approach from the source host to the destination source machine.

关键词： Cloud computing IaaS data centre storage performance analysis live migration

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