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2023 IEEE Microwaves, Antennas, and Propagation Conference, MAPCON 2023

作者： Vishwakarma, Rahul Yadav, Jyoti Mishra, Abhishek Verma, Amit Srivastava, Kumar Vaibhav Indian Institute of Technology Department of Electrical Engineering Kanpur India Indian Institute of Technology Material Science Programme Kanpur India

ISBN: (纸本)9798350328264

In this paper, a switchable Metamaterial Absorber (MMA) design and simulation based on phase change material (VO2) is presented. VO2 has been used for the switchable behaviour of MMA. The proposed design is having absorption bandwidth of 2.11 to 8.41 GHz covering the S and C bands for normal incidence of electromagnetic waves. When VO2 is in the metallic state, the design works as a wide band absorber whereas in the insulating state, it behaves as a wide band reflector. The design is symmetrical which leads to polarisation insensitive behaviour of MMA. It is stable for oblique incidence response up to 30 degrees for TE polarization and up to 60 degrees for TM polarization. The profile of MMA is 0.098 λL with a periodicity of 0.141 λL where λL corresponds to the lowest frequency. The proposed MMA will be an effective way out of the problem of complex DC biasing circuits and the use of multiple lumped elements in active metamaterial absorbers. © 2023 IEEE.

关键词： absorbers metamaterials phase change materials switchable absorbers

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Characterization of Pineapple Leaves Reinforced Cement Based Composites

Characterization of Pineapple Leaves Reinforced Cement Based...

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Green materials and Electronic Packaging Interconnect technology Symposium, EPITS 2024

作者： Ramli, Rosmamuhamadani Nor Azlan, Alif Akhyar Osman, Syaiful Zakaria, Mohd Nazarudin M. Yahaya, Sabrina Material Science Technology Programme Faculty of Applied Sciences Universiti Teknologi MARA Selangor Shah Alam40450 Malaysia Eco-Technology Programme Faculty of Applied Sciences Universiti Teknnologi MARA Selangor Shah Alam40450 Malaysia Applied Chemistry Programme Faculty of Applied Sciences Universiti Teknnologi MARA Selangor Shah Alam40450 Malaysia

ISBN: (纸本)9789819628704

The cement-based composite material known as concrete is a brittle material. After the formation of a fracture, the material is unable to absorb force and breaks immediately. Cracks can be caused by microcracks or shear stress in the interfacial transition zone between the aggregates, which is the weakest region in the matrix. The strength of concrete is determined by the link between the particles in the concrete matrix. Cracks can also arise as a result of shear stress. As a result of the widespread usage of concrete in construction, this may present a potential risk to safety. In the event that the concrete is not strong enough to absorb tension, it may result in potentially hazardous circumstances, such as accidents that occur close to the building. The use of pineapple leaf fiber (PALF) into the concrete recipe will result in an improvement in its workability. In the course of this investigation, a variety of PLAF concentrations-0, 5, 10, and 15 wt.% were combined with water, cement, and sand. The purpose of the characterisation was to ascertain the water absorptivity of PALF cement-based composites as well as their mechanical parameters, which included compressive and flexural strength. In order to examine the microstructures of the cement composites, the machines that were utilized were the Universal Testing Strength (UTS) and the Scanning Electron Microscopy (SEM). The composite material that was based on cement was produced by combining water, cement, sand, and PALF. The fiber content of the composite material was composed of 0, 5, 10, and 15 wt.%. According to the findings that were obtained, the incorporation of natural fibers resulted in an increase in the flexural toughness of the composite material, which was 0.611 MPa, and the rate of water absorption by the material was 29.9%. Nevertheless, the compressive stress was reduced to 0.977 MPa as a result of the improper distribution of the fiber and the large length of the fiber. Through the utilization o

关键词： Shear stress

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Substrate Engineering for Tuning the Absorption Response of Microwave Absorber

Substrate Engineering for Tuning the Absorption Response of ...

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2023 IEEE Microwaves, Antennas, and Propagation Conference, MAPCON 2023

作者： Yadav, Jyoti Mishra, Abhishek Vishwakarma, Rahul Srivastava, Kumar Vaibhav Ramkumar, J. Indian Institute of Technology Material Science Programme Kanpur India Indian Institute of Technology Department of Electrical Engineering Kanpur India Indian Institute of Technology Department of Mechanical Engineering Kanpur India

ISBN: (纸本)9798350328264

In this manuscript, the idea of substrate engineering is proposed and studied. The study is performed over a resistive patch printed on top of various 3D printable substrates. Two 3D printable fibers are used for the purpose: one is polylactic acid (PLA) and the other is conductive acrylonitrile butadiene styrene (CABS). The substrate design and composition are optimized for lowering overall thickness improving bandwidth, and quality factor. At last, a unit cel design is proposed for X-band absorption. More than 90% absorption is achieved up to 45° for both TE and TN polarization. The unit cell has 4-fold symmetry and is mounted on top of a honeycomb substrate made up of a composition of PLA and CABS fiber having 50% mixing by volume. © 2023 IEEE.

关键词： Additive manufacturing honeycomb Microwave absorbers substrate engineering

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Design of Improved Gain Dual Band Rectenna for RF Energy Harvesting Applications

Design of Improved Gain Dual Band Rectenna for RF Energy Har...

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2022 Wireless Power Week, WPW 2022

作者： Fatima, Farheen Thakur, Aditya Chandravanshi, Sandhya Akhtar, M. Jaleel Indian Institute of Technology Kanpur Department of Electrical Engineering UP Kanpur India Indian Institute of Technology Kanpur Material Science Programme Department UP Kanpur India

ISBN: (数字)9781665484459

ISBN: (纸本)9781665484459

In this paper, a dual band rectenna comprising a rectifier and the corresponding antenna is designed for the GSM 1.8 GHz and WLAN/WiMAX 2.5 GHz band. The dual band antenna in the present situation is chosen to be a coplanar waveguide fed slotted bow tie radiator, which is integrated with the artificial magnetic conductor kept at a distance of 10 mm from its surface to increase the overall gain of antenna. Thereafter, a dual band rectifier along with the corresponding matching network are deigned and integrated with the proposed antenna configuration. The designed rectenna is analyzed numerically using EM and circuit simulation tools of ADS Software. It is found that the simulated RF-dc conversion efficiency of designed rectenna is nearly 50% at 1.8 GHz, whereas at 2.5 GHz it is 25% corresponding to input power of-4 dBm. © 2022 IEEE.

关键词： Rectifying circuits

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Thermally Switchable Wideband Metamaterial Absorber using Vanadium Dioxide

Thermally Switchable Wideband Metamaterial Absorber using Va...

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Microwaves Antennas and Propagation Conference (MAPCON)

作者： Rahul Vishwakarma Jyoti Yadav Abhishek Mishra Amit Verma Kumar Vaibhav Srivastava Department of Electrical Engineering Indian Institute of Technology Kanpur India Material Science Programme Indian Institute of Technology Kanpur India

In this paper, a switchable Metamaterial Absorber (MMA) design and simulation based on phase change material (VO 2 ) is presented. VO 2 has been used for the switchable behaviour of MMA. The proposed design is having absorption bandwidth of 2.11 to 8.41 GHz covering the S and C bands for normal incidence of electromagnetic waves. When VO 2 is in the metallic state, the design works as a wide band absorber whereas in the insulating state, it behaves as a wide band reflector. The design is symmetrical which leads to polarisation insensitive behaviour of MMA. It is stable for oblique incidence response up to 30 degrees for TE polarization and up to 60 degrees for TM polarization. The profile of MMA is $0.098 \lambda_{L}$ with a periodicity of $0.141 \lambda_{L}$ where $\lambda_{L}$ corresponds to the lowest frequency. The proposed MMA will be an effective way out of the problem of complex DC biasing circuits and the use of multiple lumped elements in active metamaterial absorbers.

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Label-free ultra-sensitive colorimetric detection of hepatitis E virus based on oxidase-like activity of MnO2 nanosheets

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Analytical and Bioanalytical Chemistry 2023年第4期415卷 703-713页

作者： Alam, Naveed Ravikumar, Chandan Hunsur Sreeramareddygari, Muralikrishna Somasundrum, Mithran Surareungchai, Werasak School of Bioresources and Technology King Mongkut’s University of Technology Thonburi Bangkok10150 Thailand Centre for Nano and Material Sciences Jain University Jain Global Campus Jakkasandra Post Ramangaram Dist Karnataka 562112 India Pilot Plant Development and Training Institute King Mongkut’s University of Technology Thonburi Bangkok10150 Thailand Bangkok10150 Thailand Nanoscience & Nanotechnology Graduate Programme Faculty of Science King Mongkut’s University of Technology Thonburi Bangkok10140 Thailand Analytical Sciences and National Doping Test Institute Mahidol University Bangkok10400 Thailand

Hepatitis E virus (HEV) is an evolving infectious entity that causes viral hepatitis infections worldwide. Current routine methods of identifying and diagnosing HEV are someway laborious and costly. Based on the biomimicking oxidase-like activity of MnO2 nanosheets, we designed a label-free, highly sensitive colorimetric sensing technique for HEV detection. The prepared MnO2 catalyst displays intrinsic biomimicking oxidase-like catalytic activity and efficiently oxidizes the 3,3′,5,5′-tetramethylbenzidine (TMB) substrate from colorless to blue colored oxidized TMB (oxTMB) product which can be measured at 652 nm by UV–visible spectrum. When the HEV-DNA was added, DNA adsorbed easily on MnO2 surface through physical adsorption and electrostatic interaction which hinders the oxidase-like catalytic activity of MnO2. Upon the introduction of target, the HEV target DNA binds with its complementary ssDNA on the surface of MnO2, the hybridized DNA releases from the surface of MnO2, which leads to recovery of oxidase-like catalytic activity of MnO2. This strategy was applied to construct a colorimetric technique for HEV detection. The approach works in the linear range of 1 fM–100 nM DNA concentration with the limit of detection (LOD) of 3.26 fM (S/N = 3) and quantitative limit (LOQ) of 36.08 fM. The TMB-MnO2 platform was highly selective for HEV target DNA detection when compared with potential interferences. Result of serum sample analysis demonstrates that this sensing system can be used for clinical diagnostic applications. Graphical Abstract: [Figure not available: see fulltext.] © 2022, Springer-Verlag GmbH Germany, part of Springer Nature.

关键词： DNA

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Substrate Engineering for Tuning the Absorption Response of Microwave Absorber

Substrate Engineering for Tuning the Absorption Response of ...

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Microwaves Antennas and Propagation Conference (MAPCON)

作者： Jyoti Yadav Abhishek Mishra Rahul Vishwakarma Kumar Vaibhav Srivastava J. Ramkumar Material Science Programme Indian Institute of Technology Kanpur India Department of Electrical Engineering Indian Institute of Technology Kanpur India Department of Mechanical Engineering Indian Institute of Technology Kanpur India

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Synthesis and characterization of cellulose nanocrystal derived from paper as nanofiller for polymer insulation materials

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materials Today: Proceedings 2024年 97卷 69-74页

作者： Nurul Shafiqah Amirah Badi Mohamad Zul Hilmey Makmud Chin Se Mun Zuhair Jamain Jahimin Asik Khairatun Najwa Mohd Amin Future Material & Sustainable Energy (FuSE) Research Group Faculty of Science and Natural Resources Universiti Malaysia Sabah 88400 Kota Kinabalu Sabah Malaysia Industrial Chemistry Programme Faculty of Science and Natural Resources Universiti Malaysia Sabah 88400 Kota Kinabalu Sabah Malaysia Faculty of Chemical and Process Engineering Technology College of Engineering Technology Universiti Malaysia Pahang Gambang Kuantan 26300 Pahang Malaysia

The synthesis and characterization of cellulose nanocrystal by utilizing filter paper as the source of material deserves to be an advanced approach. Nanocellulose has received enormous attention due to its unique properties. Being the most abundant organic polymer on earth, nanocellulose is the most suitable candidate for alternative replacement of petroleum-based products. The cellulose was extracted from filter paper by chemical processes involved alkali treatment, bleaching treatment, and acid hydrolysis. Cellulose nanocrystal has been characterized by scanning electron microscopy (SEM), Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD) and Electrical Impedance Spectroscopy (EIS). The dielectric permittivity of the prepared CNC have been investigated in the different temperatures. The nanofiller CNC exhibits a higher real permittivity value at elevated temperatures (60 °C) in the low-frequency region. At high-frequency region, the real permittivity is independent on temperature. In brief, the studies point to the application potential of CNC for future insulation materials.

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Energy Optimization in Laser Micro-machining of Transparent Metamaterial Absorber

Energy Optimization in Laser Micro-machining of Transparent ...

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Microwaves Antennas and Propagation Conference (MAPCON)

作者： Sudeb Bhattacharya Rajkumar Kajal Chaudhary Kumar Vaibhav Srivastava J. Ramkumar Department of Electrical Engineering Indian Institute of Technology Kanpur India Department of Mechanical Engineering Indian Institute of Technology Kanpur India Material Science Programme Indian Institute of Technology Kanpur India

ISBN: (纸本)9781665452045

Radar cross section (RCS) reduction is thoroughly studied among electrical engineers so as to attain stealth capabilities of any object of interest. One particular kind of absorber which is in high demand is of the transparent and flexible kind. Transparent absorbers find their applications in various defence related applications such as in wind shield of aircraft and vehicles. Manufacturing of transparent metamaterial absorbers is a challenge as it is always a trade off between electrical performance and maintaining optical transparency. In this paper the authors present a technique of optimizing the electrical and optical performance of transparent absorber manufactured with commercially available Polyethylene Terephthalate (PET) coated Indium Tin Oxide (ITO) sheets.

关键词： Microwave antennas Radar cross-sections Polyethylene Indium tin oxide Optical device fabrication Masers Microwave theory and techniques

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Enhancement of Oblique Incidence Performance of a Microwave Absorber using Cylindrical Dielectric Resonator

Enhancement of Oblique Incidence Performance of a Microwave ...

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Microwaves Antennas and Propagation Conference (MAPCON)

作者： Jyoti Yadav Rahul Vishwakarma Mondeep Saikia Kumar Vaibhav Srivastava J. Ramkumar Material Science Programme Indian Institute of Technology Kanpur India Department of Electrical Engineering Indian Institute of Technology Kanpur India Department of Mechanical Engineering Indian Institute of Technology Kanpur India

ISBN: (纸本)9781665452045

Dielectric resonator based microwave absorber is investigated here which provides broad absorption bandwidth with wide angle of incidence. Two designs have been proposed for cylindrical dielectric resonator based unit cell for realization of microwave absorber. In first design, the ring dielectric resonator is investigated, whereas for second design the concentric cylinder along with ring dielectric resonator is used in unit cell geometry. The proposed absorbers work in C, X and Ku bands which establishes the structure to have broadband absorptivity signature over a wide range of incident angles. The advantages of these absorbers are ultra-broadband absorption without using multiple layers of resistive sheets or any other bulky elements. Moreover, the absorbers are completely 3D printable and economically efficient if we want to extend the technology to large scale manufacturing.

关键词： Fabrication Microwave technology Polarization Three-dimensional displays Absorption Simulation Three-dimensional printing

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