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multi-Band metamaterial Antenna for Terahertz Applications

Computers, materials & Continua 2023年第1期74卷 1765-1782页

作者： Adel Y.I.Ashyap m.inam m.R.Kamarudin m.H.Dahri Z.A.Shamsan K.Almuhanna F.Alorifi Faculty of Engineering Technology Universiti Tun Hussein Onn Malaysia(UTHM)Batu Pahat86400JohorMalaysia Centre for Telecommunication Research&Innovation(CETRI) Faculty of Electrical and Electronic Engineering TechnologyUniversiti Teknikal Malaysia Melaka(UTeM)Melaka76100Malaysia Department of Electronic Engineering Dawood University of Engineering and Technology74800KarachiPakistan Electrical Engineering Department College of EngineeringImam Mohammad Ibn Saud Islamic UniversityRiyadhSaudi Arabia

A multi-band metamaterial antenna is proposed to operate at the terahertz(THz)band for medical *** proposed structure is designed on a polyimide as a support layer,and its radiating elements are made of ***,the design is started with a conventional shape showing a single operating frequency at 1.1 *** achieve a multi-band operating frequency,the conventional shape was replaced with the proposed metamaterial as a radiating patch that has properties not exist in *** multi-band frequencies are obtained without compromising the overall size of the *** overall size is 600×600×25μm^(3).The operating frequencies are 0.36,0.49,0.69,0.87,and 1.04 THz.A full ground plane is used to behave as isolation between the design and the human body *** proposed design is investigated on free space and on the human body model,showing excellent performance in both *** achieved gains for the following frequencies 0.36,0.49,0.69,0.87,and 1.04 THz are 4.81,6.5,8.41,6.02,and 7.96 dB,respectively,while the efficiencies are 83.91%,96.28%,90.80%,91.71%,and 92.99%,*** conventional design was modified to have a partial ground to show the benefit of using the full *** design is loaded on the human body model and its performance is *** efficiency and gain are 6.61 dB and 95.58.7%for the case of no human body model,and 4.26 dB and 40.30%for the case of using a human body ***,the proposed metamaterial antenna will be useful for future medical applications in the THz band.

关键词： THz 5G a multi-band metamaterials 6G WBAN

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Asymmetric Patch Element Reflectarray with Dual Linear and Dual Circular Polarization

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Computers, materials & Continua 2022年第12期73卷 6085-6101页

作者： m.Hashim Dahri m.H.Jamaluddin m.inam m.R.Kamarudin F.C.Seman A.Y.I.Ashyap Z.A.Shamsan K.Almuhanna F.Alorifi Department of Electronic Engineering Dawood University of Engineering and TechnologyKarachiSindh74800Pakistan Wireless Communication Centre Universiti Teknologi Malaysia81301Johor BahruMalaysia Centre for Telecommunication Research&Innovation(CETRI) Faculty of Electrical and Electronic Engineering TechnologyUniversiti Teknikal Malaysia Melaka(UTeM)Melaka76100Malaysia Faculty of Electrical and Electronic Engineering Universiti Tun Hussein Onn MalaysiaBatu Pahat86400JohorMalaysia Electrical Engineering Department College of EngineeringImam Mohammad Ibn Saud Islamic UniversityRiyadhSaudi Arabia

A reflectarray antenna consisting of asymmetrical patch elements is proposed,which is capable of producing dual linear and dual circular polarized operation at 26GHz *** main purpose of this design is to support four different polarizations using the same patch *** proposed reflectarray has a single layer configuration with a linearly polarized feed and circular ring slots in the ground *** patch element is designed from a square patch element by tilting its one vertical side to some optimized inclination.A wide reflection phase range of 600°is obtained with the asymmetric patch element during unit cell measurements.A 332 element circular aperture reflectarray is designed with the proposed configuration and experimentally validated with a linearly polarized prime feed *** different orientations of mirror and non-mirror asymmetric patch elements on the surface of reflectarray are *** linear polarization is obtained with the mirror orientation of the asymmetric patch elements on the surface of ***,asymmetric patch elements without mirror orientation are demonstrated to produce dual circular polarization with the same linearly polarized feed.A maximum measured gain of 24.4 dB and 26.1 dB is achieved for dual linear and dual circular polarization,*** respective measured efficiencies are 28%and 41.3%,which are supported by amaximum−3 dB gain bandwidth of 13.8%and 11.5%.The circular polarization operation of the reflectarray is also supported by a 6 dB axial ratio bandwidth of 9.2%.The proposed asymmetric patch reflectarray antenna with polarization diversity,wide bandwidth and high gain is suitable to be used in many high frequency applications of 5G communication.

关键词： 5G reflectarray polarization diversity circular polarization

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Linearly Polarized millimeter Wave Reflectarray with mutual Coupling Optimization

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Computers, materials & Continua 2022年第8期72卷 2397-2410页

作者： m.inam m.H.Dahri m.R.Kamarudin A.Y.I.Ashyap m.H.Jamaluddin N.H.Sulaiman m.A.Khan Z.A.Shamsan K.Almuhanna F.Alorifi Centre for Telecommunication Research&Innovation(CETRI) Faculty of Electrical and Electronic Engineering TechnologyUniversiti Teknikal Malaysia Melaka(UTeM)Melaka76100Malaysia Dawood University of Engineering and Technology Karachi City Sindh74800Pakistan Faculty of Electrical and Electronic Engineering Universiti Tun Hussein Onn MalaysiaBatu Pahat86400JohorMalaysia Wireless Communication Centre Universiti Teknologi MalaysiaJohor Bahru81301Malaysia Faculty of Computing and Engineering Quest International UniversityIpoh30250PerakMalaysia Balochistan University of Information Technology(FICT) Engineering and Management SciencesQuettaPakistan Electrical Engineering Department College of EngineeringImam Mohammad Ibn Saud Islamic UniversityRiyadhSaudi Arabia

This work provides the design and analysis of a single layer,linearly polarized millimeter wave reflectarray antenna with mutual coupling *** analysis was carried out at 26GHz design frequency using the simulations of the reflectarray unit cells as well as the periodic reflectarray *** simulated results were verified by the scattering parameter and far-fieldmeasurements of the unit cell and periodic arrays,*** agreement between the simulated and measured results was observed in all the *** from the unit cells and reflectarray,the waveguide and horn antenna were also fabricated to be used in the *** measured scattering parameter results of the proposed circular ring unit cells provided a maximum reflection loss of 2.8 dB with phase errors below 10°.On the other hand,the measured far-field results of the 20×20 reflectarray antenna provided a maximum gain of 26.45 dB with a maximum 3 dB beam width of 12°and 1 dB gain drop bandwidth of 13.1%.The performance demonstrated by the proposed reflectarray antenna makes it a potential candidate to be used in modern-day applications such as 5th Generation(5G)and 6th Generation(6G)communication systems.

关键词： Reflectarray millimeter wave antenna mutual coupling antenna measurements

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Triple-Band metamaterial Inspired Antenna for Future Terahertz(THz)Applications

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Computers, materials & Continua 2022年第7期72卷 1071-1087页

作者： Adel Y.I.Ashyap S.Alamri S.H.Dahlan Z.Z.Abidin m.inam Abbasi Huda A.majid m.R.Kamarudin Y.A.Al-Gumaei m.Hashim Dahri Center for Applied Electromagnetic(EmCenter) Faculty of Electrical and Electronic EngineeringUniversiti Tun Hussein Onn Malaysia(UTHM)Batu Pahat86400JohorMalaysia Faculty of Engineering Electrical Engineering Dep. Al Baha UniversityAlaqiq65799Al-BahaSaudi Arabia Advanced Telecommunication Research Center(ATRC) Faculty of Electrical and Electronic EngineeringUniversiti Tun Hussein Onn Malaysia(UTHM)Batu Pahat86400JohorMalaysia Faculty of Electrical and Electronic Engineering Technology Universiti Teknikal Malaysia MelakaHang Tua Jaya76100Durian TunggalMelakaMalaysia Department of mathematics Physicsand Electrical EngineeringNorthumbria UniversityNE18ST Newcastle Upon TyneUK Department of Electronic Engineering Dawood University of Engineering and TechnologyKarachi74800Pakistan

For future healthcare in the terahertz(THz)band,a triple-band microstrip planar antenna integrated with metamaterial(mTm)based on a polyimide substrate is *** frequencies of operation are 500,600,and 880 *** triple-band capability is accomplished by etching metamaterial on the patch without affecting the overall antenna *** of a partial ground plane,a full ground plane is used as a buffer to shield the body from back radiation emitted by the *** overall dimension of the proposed antenna is 484×484μm^(2).The antenna’s performance is investigated based on different crucial factors,and excellent results are *** gain for the frequencies 500,600,880GHz is 6.41,6.77,10.1 dB,respectively while the efficiency for the same frequencies is 90%,95%,96%,*** research has been conducted by mounting the presented antenna on a single phantom layer with varying dielectric *** results show that the design works equally well with and without the phantom model,in contrast to a partially ground antenna,whose performance is influenced by the presence of the phantom *** a result,the presented antenna could be helpful for future healthcare applications in the THz band.

关键词： THz metamaterial triple-band wireless body area networks(WBAN)

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Improved Sequencing Heuristic DSDV Protocol Using Nomadic mobility model for FANETS

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Computers, materials & Continua 2022年第2期70卷 3653-3666页

作者： inam Ullah Khan muhammad Abul Hassan muhammad Fayaz Jeonghwan Gwak muhammad Adnan Aziz Department of Electronic Engineering Isra University(SEAS)Islamabad44000Pakistan Department of Computing and Technology Abasyn University Peshawar25000Pakistan Deparment of Computer Engineering Jeju National UniversityJejuKorea Department of Software Korea National University of TransportationChungju27469Korea Department of Biomedical Engineering Korea National University of TransportationChungju27469Korea Department of AI Robotics Engineering Korea National University of TransportationChungju27469Korea Department of IT&Energy Convergence(BK21 FOUR) Korea National University of TransportationChungju27469Korea

most interesting area is the growing demand of flying-IoT mergers with smart ***,aerial vehicles,especially unmanned aerial vehicles(UAVs),have limited capabilities for maintaining node energy *** order to communicate effectively,IoT is a key element for smart *** improving network performance,routing protocols can be deployed in flying-IoT to improve latency,packet drop rate,packet delivery,power utilization,and average-end-to-end ***,in literature,proposed techniques are verymuch complex which cannot be easily implemented in realworld *** issue leads to the development of lightweight energyefficient routing in flying-IoT *** paper addresses the energy conservation problem in *** paper presents a novel approach for the internet of flying vehicles using DSDV ***-DSDV gives the notion of bellman-ford algorithm consisting of routing updates,information broadcasting,and stale *** shows optimal results in comparison with other contemporary routing *** mobility model is utilized in the scenario of flying networks to check the performance of routing protocols.

关键词： Flying-IoT DSR smart cities UAV’s FANETS

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Influence of macro-Topography on Damage Tolerance and Fracture Toughness of monolithic Epoxy for Tribological Applications

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World Journal of Engineering and Technology 2016年第2期4卷 335-360页

作者： Rasheed Atif Fawad inam Department of mechanical and Construction Engineering Faculty of Engineering and Environment Northumbria University Newcastle upon Tyne UK

Influence of topographical features on mechanical properties of monolithic epoxy samples has been studied. The topographical features studied include waviness (Wa), roughness average (Ra), root mean square value (Rq), and maximum roughness height (Rmax or Rz). The Rz of as-cast monolithic epoxy samples was 13.93 μm. By treating with velvet cloth, the Rz value significantly decreased to 2.28 μm. The Rz value of monolithic epoxy sample treated with abrasive paper 1200P was 4.85 μm which was also lower than that of as-cast monolithic epoxy samples. However, Rz values significantly increased by treating with abrasive papers 320P and 60P and became 20.32 μm and 39.32 μm, respectively. It was interesting to note that although Ra, Wa, and Rq, all increased by treating the monolithic epoxy samples with abrasive paper 1200P, however, Rz decreased by abrasive paper 1200P. A weight loss of up to 17% was observed in monolithic epoxy samples after the treatment with the abrasive papers. Both V-shaped and U-shaped notches were produced on the surfaces of the samples. The mechanical properties were significantly degraded due to surface notches mainly because of the associated stress concentration effect. The topographical features also influenced the dynamic mechanical properties and fracture mode.

关键词： Topography Fracture Toughness monolithic Epoxy mechanical Properties Fractography

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Periodic surface functional group density on graphene via laserinduced substrate patterning at Si/SiO2 interface

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Nano Research 2020年第9期13卷 2332-2339页

作者： Karolina A.Drogowska-Horna inam mirza Alvaro Rodriguez Petr Kovaricek Juraj Sladek Thibault J.-Y.Derrien mindaugas Gedvilas Gediminas Raciukaitis Otakar Frank Nadezhda m.Bulgakova martin Kalbac J.Heyrovsky Institute of Physical Chemistry of the Czech Academy of Sciences Dolejskova 2155/318223 PragueCzech Republic HiLASE Centre Institute of Physics of the Czech Academy of SciencesZa Radnict 82825241 Dolni BrezanyCzech Republic Faculty of Nuclear Sciences and Physical Engineering Czech Technical University in PragueBrehova 78/711519Czech Republic Center for Physical Sciences and Technology Savanoriu Ave.231LT-023000VilniusLithuania

Controlling the spatial distribution of functional groups on two-dimensional(2D)materials on a micrometer scale and below represents a fascinating opportunity to achieve anisotropic(opto)electronic properties of these *** patterns of covalent functionalization can lead to pericxJic potentials in the monolayer;however,creating such superstructures is very ***,we describe an original approach to the periodic functionalization of graphene induced by substrate patterning using a pulsed ***-induced periodic surface structures(LIPSS)are produced on silicon wafers with thermally-grown oxide *** irradiation conditions for the formation of UPSS confined at the SiO2/Si interface have been *** imprint their periodicity to the reactivity of the monolayer graphene placed on the substrate via modulation of its local doping *** method is clean,straightforward and scalable with high spatial resolution.

关键词： two-dimensional(2D)materials graphene functionalization laser-induced periodic surface structures(LIPSS) periodic patterns Raman spectroscopy atomic force microscopy(AFm)

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Clinical profile,diagnostic yield,and procedural outcomes of single balloon enteroscopy:A tertiary care hospital experience

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World Journal of Gastrointestinal Endoscopy 2022年第9期14卷 555-563页

作者： maha inam masood m Karim Umar Tariq Faisal Wasim Ismail medical College Aga Khan University HospitalKarachi 74800Pakistan Department of medicine Aga Khan University HospitalKarachi 74800Pakistan

BACKGROUND Single balloon enteroscopy(SBE)allows ease of access for small bowel visualization and has multiple diagnostic and therapeutic *** provides the advantage of performing various therapeutic interventions alongside the diagnostic *** has also been considered a relatively safe procedure with no major *** To investigate the indications,safety,and clinical yield of SBE,and determine its effect on disease *** A retrospective,descriptive study was conducted at a tertiary care hospital in Karachi,*** records of 56 adult patients(≥18 years)who underwent SBE between July 2013 and December 2021 were reviewed and data were collected using a structured proforma.A descriptive analysis of the variables was performed using Statistical Package of Social Sciences Version *** are reported as the mean±SD for quantitative variables and numbers and percentages for qualitative *** data are reported as *** A total of 56 patients who underwent 61 SBE procedures were *** mean age was 50.93±16.16 years,with 53.6%of them being ***(39.3%)and diabetes mellitus(25.0%)were the most common pre-existing *** gastrointestinal bleed(39.3%)was the most common indication for enteroscopy,followed by chronic diarrhea(19.7%)and unexplained anemia(16.4%).The majority of procedures were performed in the endoscopy suite(90.2%)under monitored anaesthesia care(93.4%).most procedures were diagnostic(91.8%)and completed without complications(95.1%).The depth of examination ranged from 95 cm to 500 cm with a mean of 282.05±90.04 *** most common findings were inflammation and ulcerations(29.5%),followed by masses(19.7%)and vascular malformations(14.8%).As a result of the findings,a new diagnosis was made in 47.5%of the cases and a previous one was ruled out in 24.6%of them;65.6%of the cases had a change in *** SBE is a suitable modality for investigatin

关键词： Single balloon enteroscopy Small bowel diseases Gastrointestinal bleed Small bowel endoscopy Small bowel Balloon-assisted enteroscopy

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合成阿昔洛韦稳定和磷脂稳定的银纳米粒子用于在不同介质中选择性识别Hg2+和氯氧化铜

合成阿昔洛韦稳定和磷脂稳定的银纳米粒子用于在不同介质中选择性...

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作者： inam ULLAH 北京化工大学

学位级别：硕士

汞(Hg)和氯氧化铜(CuOxy)是被广泛发现的有毒物质,由于其不利影响而引起了研究人员的极大关注。目前报道的Hg和CuOxy测定方法耗时、灵敏度低、选择性差,并且需要使用昂贵的仪器检测。因此,迫切需要设计和开发高效、经济、灵敏和选择性高... 详细信息

汞(Hg)和氯氧化铜(CuOxy)是被广泛发现的有毒物质,由于其不利影响而引起了研究人员的极大关注。目前报道的Hg和CuOxy测定方法耗时、灵敏度低、选择性差,并且需要使用昂贵的仪器检测。因此,迫切需要设计和开发高效、经济、灵敏和选择性高的Hg和CuOxy传感器。目前,纳米材料由于具有较大的比表面积、独特的表面特性、活性和靶向功能以及较高的稳定性,被广泛用作环境毒素的高灵敏度和选择性传感器。在该研究项目的第一部分,合成了高灵敏度的阿昔洛韦稳定银纳米粒子(AC-AgNPs),并将其作为用于Hg检测的纳米传感器进行了研究。通过化学还原方法合成,然后通过紫外-可见(UV-Vis)光谱、动态光散射(DLS)、傅里叶变换红外(FTIR)光谱和原子力显微镜(AFm)对其进行表征。合成的AC-AgNPs具有44.1nm的小尺寸、均匀的尺寸分布、均匀的形态和-17.4 m V的zeta电位。AC-AgNPs用于检测去离子水、河流和海水样品以及人血浆中的Hg。即使在存在其他金属离子、浓度为2 m的浓缩电解质溶液、pH范围在5到14之间以及人体血浆的情况下,纳米传感器也表现出对Hg传感的高选择性。化学荧光分析检测金属离子工作曲线(Jobs plot工作曲线)的实验结果表明,AC-AgNPs和Hg的结合化学计量比为1:2,检测限为0.035μm。研究结果表明,合成的纳米粒子有用作新型比色传感器的潜力,能够在各种介质中具有选择性并轻松地检测Hg离子。在该项目的第二部分中,通过化学还原反应合成了一种极具选择性和敏感性的Pl-AgNPs(DSPE-PEG,一种磷脂稳定的银纳米粒子),并通过扫描电子显微镜(SEm)、动态光散射(DLS)、傅里叶变换红外(FTIR)光谱、紫外-可见(UV-vis)光谱和XRD。合成的Pl-AgNPs尺寸小(96.23nm),多分散指数(PDI)为0.42,尺寸分布和形态均匀。即使在有对抗性的农药残留、浓缩电解质溶液(2 m)、广泛的p H值(1-14)条件下,Pl-AgNPs仍能检测到去离子水和人血浆中掺入的微量CuOxy。该纳米传感器对检测CuOxy具有高度选择性,检测限为0.0283μm。通过实验观察到Pl-AgNPs和CuOxy之间存在1:2的结合化学计量关系。根据我们目前的研究发现,合成的纳米粒子有望被用于开发一种新型比色传感器,用于选择性和实时检测各种介质中的CuOxy。

关键词：重金属银纳米粒子毒性生态系统量热传感器氯氧化铜

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Immunohistochemical Expression of Biomarkers and Human Papilloma Virus Infection in Esophageal Squamous Cell Carcinoma Patients of Pakistan-HPV and Biomarkers in ESCC

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国际感染病学（电子版） 2019年第1期8卷 1-7页

作者： S.m.Adnan Ali Yumna mirza m.Ozair Awan K.m.inam Pal Zubair Ahmad Office of Academia and Research in Surgery Department of SurgeryAga Khan University Hospital medical College Aga Khan University Hospital Section of General Surgery Department of SurgeryAga Khan University Hospital Section of Histopathology Department of Pathology and Laboratory MedicinesAga Khan University Hospital

Objective To determine HPV infection status and expression of p16, cyclooxygenase-2(COX-2), Cyclin D1 and epidermal growth factor receptor(EGFR) in ESCC patients of Pakistan. methods 51 ESCC patients treated at Aga Khan University Hospital(AKUH) were included. HPV infection status was confirmed via PCR while the expression of the four biomarkers was determined using immunohistochemistry. The correlation of all markers with patient clinicopathological features as well as each other was analyzed. Results HPV infection status and p16 overexpression was found to be negative in all the patients while COX-2, Cyclin D1 and EGFR were overexpressed in 56.9%, 62.7% and 49.0% of the patients respectively. COX-2 showed a significant correlation with tumor invasion while EGFR was shown to be significantly correlated with histological grading and COX-2 expression. Conclusion COX-2 and EGFR can be used as prognostic markers. HPV does not seem to be a causative agent for ESCC in Pakistan.

关键词： COX-2 Cyclin D1 EGFR ESCC HPV

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