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Computational Investigation of Multiband EMNZ Metamaterial Absorber for Terahertz Applications

Computers, Materials & Continua 2022年第5期71卷 3905-3920页

作者： Ismail Hossain Md Samsuzzaman Mohd Hafiz Baharuddin Norsuzlin Binti Mohd Sahar mandeep singh jit singh Mohammad Tariqul Islam Space Science Center Universiti Kebangsaan Malaysia43600UKM BangiSelangorMalaysia Department of Computer and Communication Engineering Faculty of Computer Science and EngineeringPatuakhali Science and Technology UniversityBangladesh Department of Electrical Electronic and Systems EngineeringFaculty of Engineering and Built EnvironmentUniversiti Kebangsaan MalaysiaMalaysia

This study presents an Epsilon Mu near-zero(EMNZ)nanostructured metamaterial absorber(NMMA)for visible regime *** resonator and dielectric layers are made of tungsten(W)and quartz(fused),where the working band is expanded by changing the resonator layer’s *** to perfect impedance matching with plasmonic resonance characteristics,the proposed NMMA structure is achieved an excellent absorption of 99.99%at 571 THz,99.50%at 488.26 THz,and 99.32%at 598 THz *** absorption mechanism is demonstrated by the theory of impedance,electric field,and power loss density distributions,*** geometric parameters are explored and analyzed to show the structure’s performance,and a near-field pattern is used to explain the absorption mechanism at the resonance frequency *** numerical analysis method describes that the proposed structure exhibited more than 80%absorbability between 550 and 900 *** Computer Simulation Technology(CST Microwave Studio 2019)software is used to design the proposed ***,CSTHFSS interference is validated by the simulation data with the help of the finite element method(FEM).The proposed NMMA structure is also exhibits glucose concentration sensing capability as *** the proposed broadband absorber may have a potential application in THz sensing,imaging(MRI,thermal,color),solar energy harvesting,light modulators,and optoelectronic devices.

关键词： Metamaterial absorber terahertz applications multiband EM near zero nanostructured visible regime applications

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Inkjet Printed Metamaterial Loaded Antenna for WLAN/WiMAX Applications

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Computers, Materials & Continua 2022年第5期71卷 2271-2284页

作者： Farhad Bin Ashraf Touhidul Alam Md Tarikul Islam mandeep jit singh Norbahiah Binti Misran Mohammad Tariqul Islam Department of Electrical Engineering Polytechnique MontréalMontréalQC H3T 1J4Canada Space Science Centre(ANGKASA) Institute of Climate Change(IPI)Universiti Kebangsaan MalaysiaBangi43600SelangorMalaysia Department of Electrical Electronic and Systems EngineeringFaculty of Engineering and Built EnvironmentUniversiti Kebangsaan MalaysiaMalaysia

In this paper,the design and performance analysis of an Inkjetprinted metamaterial loaded monopole antenna is presented for wireless local area network(WLAN)and worldwide interoperability for microwave access(WiMAX)*** proposed metamaterial structure consists of two layers,one is rectangular tuning fork-shaped antenna,and another layer is an inkjet-printed metamaterial *** metamaterial layer is designed using four split-ring resonators(SRR)with an H-shaped inner structure to achieve negative-index metamaterial *** metamaterial structure is fabricated on low-cost photo paper substrate material using a conductive inkbased inkjet printing technique,which achieved dual negative refractive index bands of 2.25–4.25 GHz and 4.3–4.6 *** antenna is designed using a rectangular tuning fork structure to operate at WLAN and WiMAX *** antenna is printed on 30×39×1.27 mm3 Rogers RO3010 substrate,which shows wide impedance bandwidth of 0.75 GHz(2.2 to 2.95 GHz)with 2 dB realized gain at 2.4 *** integrating metamaterial structure,the impedance bandwidth becomes 1.25 GHz(2.33 to 3.58 GHz)with 2.6 dB realized gain at 2.4 *** antenna bandwidth and gain have been increased using developed quad SRR based metasurface by 500 MHz and 0.6 dBi ***,the proposed quad SRR loaded antenna can be used for 2.4 GHz WLAN bands and 2.5 GHz WiMAX *** contribution of this work is to develop a cost-effective inject printed metamaterial to enhance the impedance bandwidth and realized the gain of a WLAN/WiMAX antenna.

关键词： Metamaterial epsilon negative antenna split ring resonator WiMAX WLAN

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Experimental investigation into the effects of Argemone biodiesel/diesel blends on cyclic variations in a multi-cylinder CRDI engine

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Clean Energy 2023年第2期7卷 363-374页

作者： Abhinav Sharma Prem Kumar Sarbjot singh Sandhu mandeep singh Department of Mechanical Engineering Dr B R Ambedkar National Institute of TechnologyJalandhar-144011PunjabIndia

Internal combustion engines suffer from high cyclic variations that result in higher emissions,lower efficiency,higher fuel consump-tion and poor *** purpose of this study is to investigate how Argemone mexicana biodiesel(AGB)/diesel blended fuels affect the cyclic variability of combustion parameters such as maximum cylinder pressure(Pmax)and indicated mean effective pressure(IMEP)in a four-cylinder turbocharged intercooled common-rail direct injection engine under various engine loading *** chemical and physical properties of AGB produced from *** oil were measured and compared according to the ASTM D6751 *** various volumetric ratios,AGB and diesel fuel were blended as D100,AB10(10%AGB+90%D100),AB20(20%AGB+80%D100)and AB30(30%AGB+70%D100).The IMEP and Pmax time-series data were collected over 200 consecutive cycles at low,partial and high engine loads at a constant engine speed of 2000 *** coefficients of variation(COV)of combustion parameters(Pmax and IMEP)were measured for different AGB/diesel blends and found to be within acceptable *** results show that COV_(Pmax) and COV_(IMEP) decrease as the engine load *** was observed that at low load,AB10 has the lowest COV(Pmax,IMEP),and at partial and high load,AB20 has the lowest COV(Pmax,IMEP)among all the blends.

关键词： indicated mean effective pressure cyclic variations biodiesel diesel engine Argemone mexicana biodiesel

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RSS-Based Indoor Localization System with Single Base Station

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Computers, Materials & Continua 2022年第3期70卷 5437-5452页

作者： Samir Salem Al-Bawri Mohammad Tariqul Islam mandeep jit singh Mohd Faizal Jamlos Adam Narbudowicz Max J.Ammann Dominique M.M.P.Schreurs Space Science Centre Climate Change InstituteUniversiti Kebangsaan MalaysiaBangi43600Malaysia Department of Electrical Electronic and Systems EngineeringFaculty of Engineering and Built EnvironmentUniversiti Kebangsaan MalaysiaUKMBangi43600SelangorMalaysia Faculty of Mechanical Engineering Universiti Malaysia PahangPekan26600PahangMalaysia Antenna and High Frequency Research Centre School of Electrical&Electronic EngineeringDublin Institute of TechnologyDublin 8Ireland Department of Electrical Engineering Division ESAT-TELEMICKU LeuvenBelgium

The paper proposes an Indoor Localization System(ILS)which uses only one fixed Base Station(BS)with simple non-reconfigurable *** proposed algorithm measures Received Signal Strength(RSS)and maps it to the location in the room by estimating signal strength of a direct line of sight(LOS)signal and signal of the first order reflection from the *** algorithm is evaluated through both simulations and empirical measurements in a furnished open space office,sampling 21 different locations in the *** is demonstrated the system can identify user’s real-time location with a maximum estimation error below 0.7 m for 80%confidence Cumulative Distribution Function(CDF)user level,demonstrating the ability to accurately estimate the receiver’s location within the *** system is intended as a cost-efficient indoor localization technique,offering simplicity and easy integration with existing wireless communication *** comparable single base station localization techniques,the proposed system does not require beam scanning,offering stable communication capacity while performing the localization process.

关键词： Indoor localization localization techniques received signal strength

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Agreement in experimental and theoretically obtained electrocaloric effect in optimized Bi^(3+)doped PbZr_(0.52)Ti_(0.48)O_(3)material

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Journal of Advanced Dielectrics 2022年第3期12卷 17-27页

作者： Shubhpreet Kaur Mehak Arora Sunil Kumar Parambir singh Malhi mandeep singh Anupinder singh Department of Physics Guru Nanak Dev UniversityAmritsar143001 PunjabIndia Department of Chemistry Guru Nanak Dev UniversityAmritsar143001 PunjabIndia

This work harmonizes the experimental and theoretical study of electrocaloric effect(ECE)in(Pb_(0.8)Bi_(0.2))(Zr_(0.52)Ti_(0.48))O_(3)solid solution by optimizing sintering ***^(3+)-doped PbZr_(0.52)Ti_(0.48)O_(3)solid solutions were synthesized by the conventional solid-state reaction *** samples were prepared by varying the sintering temperature.X-ray diffraction study con-firms the crystalline nature of all the *** immense value of polarization has been acquired in the optimized *** maximum adiabatic temperature change of order 2.53 K with electrocaloric strength of 1.26 K mm kV^(−1)has been achieved *** a comparatively close value of ECE has been acquired from the theoretical calculations using a phenomeno-logical ***,a large value(218 mJ cm^(−3))of thermal energy conversion has been obtained using the Olsen cycle.

关键词： Ferroelectrics solid-state reaction method electrocaloric effect energy harvesting

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Three co-located resistance genes confer resistance to leaf rust and stripe rust in wheat variety Borlaug 100

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The Crop Journal 2022年第2期10卷 490-497页

作者： Bowei Ye Ravi P.singh Chan Yuan Demei Liu mandeep S.Randhawa Julio Huerta-Espino Sridhar Bhavani Evans Lagudah Caixia Lan College of Plant Science&Technology Huazhong Agricultural UniversityWuhan 430070HubeiChina International Maize and Wheat Improvement Center(CIMMYT) Apdo.Postal 6-64106600 Mexico D.F.Mexico Qinghai Provincial Key Laboratory of Crop Molecular Breeding Northwest Institute of Plateau BiologyChinese Academy of ScienceXining 810008QinghaiChina Campo Experimental Valle de México INIFAP Apdo.Postal 1056230ChapingoEdo.de MexicoMexico CSIRO Agriculture&Food GPO Box 1600CanberraACT 2601Australia

Leaf rust(LR) and stripe rust(YR) are important diseases in wheat producing areas worldwide and cause severe yield losses under favorable environmental conditions when susceptible varieties are grown. We determined the genetic basis of resistance to LR and YR in variety Borlaug 100 by developing and phenotyping a population of 198 F6 recombinant inbred lines derived from a cross with the susceptible parent Apav#1. LR and YR phenotyping were conducted for 4 and 3 seasons, respectively, at CIMMYT research stations in Mexico under artificial epidemics. Mendelian segregation analyses indicated that 3–5 LR and 2 YR genes conferred resistance in Borlaug 100. Lr46/Yr29(1 BL), Yr17(2 AS) and Yr30(3 BS) were present in the resistant parent and segregated in the RIL population based on characterization by molecular markers linked to these genes. When present alone, Lr46/Yr29 caused average 13% and 16% reductions in LR and YR severities, respectively, in RILs. Similarly, Yr17 and Yr30 reduced YR severities by 57% and 11%, respectively. The Yr30 and the Yr17 translocation were also associated with 27% and 14% reductions, respectively, in LR severity, indicating that the 3 BS and 2 AS chromosomal regions likely carry new slow rusting LR resistance genes, temporarily designated as Lr B1 and Lr B2, respectively. Additive effects of Yr30*Yr17, Yr29*Yr17 and Yr29*Yr30 on YR and LR were significant and reduced YR severities by 56%,55%, and 45%, respectively, and LR severities by 34%, 40%, and 45%, respectively. Furthermore, interaction between the three genes was also significant, with mean reductions of 70% for YR and 54% for LR severities. Borlaug 100, or any one of the 21 lines with variable agronomic traits but carrying all three colocated resistance loci, can be used as resistance sources in wheat breeding programs.

关键词： Co-located resistance loci Common wheat Gene interaction Puccinia triticina Puccinia striiformis Triticum aestivum

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The mechanism and effects of subgrade fluidisation under ballasted railway tracks

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Railway Engineering Science 2020年第2期28卷 113-128页

作者： Buddhima Indraratna mandeep singh Thanh Trung Nguyen Centre for Geomechanics and Railway Engineering University of WollongongWollongong CityNSW 2522Australia Australian Research Council(ARC)Industrial Transformation Training Centre ITTC-RailUniversity of WollongongWollongong CityNSW 2522Australia

The rapid growth in railway infrastructure and the construction of high-speed heavy-haul rail network,especially on ground that is basically unsuitable,poses challenges for geotechnical engineers because a large part of the money invested in the development of railway lines is often spent on track *** fact around the world,the mud pumping of subgrade fines is one of the common reasons why track performance deteriorates and track stability is *** article presents a series of laboratory tests to examine following aspects of mud pumping:(1)the mechanisms of subgrade fluidisation under undrained condition,(2)the effects of mud pumping on the engineering characteristics of ballast,and(3)the use of vertical drains to stabilize subgrade under cyclic *** undrained cyclic triaxial testing on vulnerable soft subgrade was performed by varying the cyclic stress ratio(CSR)from 0.2 to 1.0 and the loading frequency f from 1.0 to 5.0 *** is seen from the test results that for a specimen compacted at an initial dry density of 1790 kg/m3,the top portion of the specimen fluidises at CSR=0.5,irrespective of the applied loading *** cyclic railway loading,the internal redistribution of water at the top of the subgrade layer softens the soil and also reduces its *** response to these problems,this paper explains how the inclusion of vertical drains in soft subgrade will help to prevent mud pumping by alleviating the build-up of excess pore pressures under moving train loads.

关键词： Mud pumping Ballasted track Subgrade fluidisation Fouled ballast Prefabricated vertical drains

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Paradoxical Low Flow Low Gradient Severe Aortic Stenosis—An Under-Recognized Entity

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Case Reports in Clinical Medicine 2022年第2期11卷 31-36页

作者： Phillip Crane mandeep singh Kalsi Matias Yudi Naveen Sharma Department of Cardiology The Northern Hospital Melbourne Australia Department of Cardiology Austin Health Melbourne Australia

Some patients with severe aortic stenosis (AS), due to restrictive cardiac physiology, paradoxically have relatively low flow and low gradients across stenotic aortic valves despite preserved left ventricular (LV) systolic function. It results in symptoms and reduced quality of life and carries a high mortality. Whilst this form of severe AS, termed paradoxical low flow low gradient (pLFLG), is well reported, patients with this diagnosis experience inappropriate barriers to aortic valve replacement (AVR), the only efficacious treatment. We present the case of an 88-year-old female with 12 months of exertional dyspnoea on a background of hypothyroidism and hypercholesterolemia. Transthoracic echocardiogram (TTE) revealed LV hypertrophy, with a small LV cavity size and reduced stroke volume, yet normal systolic function. A heavily calcified aortic valve was identified with severe aortic stenosis, based on valve area, yet with incongruous mean transvalvular gradient of 25 mmHg (severe ≥ 50 mmHg). Following exclusion of other differential diagnoses, her symptoms were attributed to paradoxical LFLG severe AS. She was however declined definitive transcatheter aortic valve implantation (TAVI) due to her paradoxically low mean aortic gradient. Following further deterioration in her symptoms and supportive quantification of poor exercise performance, she was ultimately re-referred, accepted, and underwent TAVI. Following her AVR, the patient experiences significant improvement in both symptoms and quality of life after only one month. Paradoxical LFLG severe AS remains a well-documented yet under recognized disease. It carries high morbidity and mortality if untreated, yet is significantly less likely to be referred and accepted for intervention. With its prevalence expected to rise with an ageing population, this case serves as a timely reminder for clinicians to address the under recognition of important pathology.

关键词： Paroxysmal Low Flow Low Gradient Doppler Echocardiography Aortic Valve Stenosis Aortic Valve Implantation Valvular Heart Disease

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The modified magnetodielectric response in KNN-CZFMO based particulate multiferroic composite system

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Journal of Advanced Dielectrics 2020年第5期10卷 58-68页

作者： Kulwinder Kaur mandeep singh Jaspal singh Sanjeev Kumar Department of Physics Punjabi UniversityPatiala 147002India Applied Sciences Department Punjab Engineering College(Deemed to be University)Chandigarh 160012India

Lead-free multiferroic composites of 1−x(K_(0.5)Na_(0.5)NbO_(3−x))(Co_(0.6)Zn_(0.4))(Fe_(1.7)Mn_(0.3))O_(4)(KNN-CZFMO),where x=0.0,0.1,0.2,0.3,0.4,0.5 and 1.0,have been investigated for their structural,morphological,electrical,magnetic,dielectric and magneto-dielectric *** of KNN and CZFMO crystal structure in each composite has been confirmed from X-ray diffrac-tion analysis(XRD).Cuboidal-shaped grains of KNN and spherical-shaped grains of CZFMO have been observed by scanning electron microscopy(SEM).The room temperature ferroelectric behavior as confirmed by polarization versus electric field(P-E)hysteresis loops has been found to be decreasing with increasing CZFMO *** magnetic ordering with the increase in CZFMO concentration in the prepared composites has been observed by magnetization versus magnetic field(M-H)hysteresis *** electrical conductivity of composites has been studied using Jonscher’s universal power *** room temperature dielectric constant(ε′)and dielectric loss(tanδ)have been observed to decrease with the increase in the frequency of the applied external electric *** dielectric relaxation behavior has been observed using curve fitting analysis via the Havriliak-Negami relaxation *** value of the magnetodielectric(MD)effect~−11%at a frequency of 1 kHz with the applied magnetic field of 1 T has been achieved for 0.9 KNN−0.1 CZFMO(x=0.1)composite in the present research work.

关键词： Multiferroics composites magnetodielectric effect

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Continuous B scan ultrasound guided post-traumatic sub-periosteal orbital hematoma drainage: An advantage over routine needle drainage procedure

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World Journal of Emergency Medicine 2019年第4期10卷 248-250页

作者： Amar Pujari Pallavi singh Ayushi Sinha Shreya Nayak mandeep S.Bajaj Rajendra Prasad Centre for Ophthalmic Sciences All India Institute of Medical Sciences

Dear editor,Traumatic orbital haemorrhage is an unfortunate complication with potential vision-threatening consequences.[1-3]The collection of blood can occur anywhere along the potential free orbital spaces,[4]but the subperiosteal collection of the blood is an important clinical variant where careful and timely intervention can give commendable rewards to the surgeon as well as to the patient.[1,2]Subperiosteal hematoma could be traumatic or non-traumatic,in turns,the non-traumatic cases may be due to bleeding tendency as in cases of leukaemia.

关键词： Traumatic orbital haemorrhage unfortunate complication consequences

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