Article
Chemistry, Physical
Pei Han, Chaoyang Wu, Jieyu Tai, Hao Zhang, Guizhe Zhao, Qihui Chen, Yaqing Liu
Summary: Ferrite Fe3O4 and graphene oxide (GO) were covalently bonded and reduced to fabricate microwave absorbing material (MAM) with high absorption performance. The Fe3O4-rGO hybrid nanocomposites showed excellent impedance matching characteristics and a minimum reflection loss (RLmin) of -47.46 dB at a thickness of 3.5 mm. XPS and FT-IR spectroscopy confirmed the formation of amide bonds between modified Fe3O4 and functional GO. SEM, EDS, TEM, and Raman spectroscopy were used to analyze the morphology and structure of the hybrid nanocomposites.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Engineering, Multidisciplinary
Yue Zhou, Shi-jun Wang, Dian-sen Li, Lei Jiang
Summary: Graphene composite aerogels exhibit excellent microwave absorption properties and are a versatile material. By utilizing various dielectric and conductive mechanisms, the material's microwave absorption performance is enhanced. The material not only has outstanding absorption properties, but also performs well in terms of mechanical properties and heat resistance.
COMPOSITES PART B-ENGINEERING
(2021)
Article
Chemistry, Multidisciplinary
Congyi Qian, Xiaohui Liang, Mei Wu, Xingxin Zhang
Summary: By adjusting the ratio of Fe3O4 and rGO, a lightweight microwave-absorbing material with a strong electromagnetic-absorption capability of practical significance in the field of electromagnetic compatibility was obtained.
Article
Materials Science, Multidisciplinary
Fanglan Fan, Zhichao Hu, Yuling Ye, Xiaonan Liu
Summary: Annular Fe3O4 magnetic particles were prepared by hydrothermal method, mixed with polyaniline (PANI) and graphene oxide in ethanol solution. The structure and composition of the composites were analyzed and the microwave absorption performance was evaluated. It was found that the Fe3O4/rGO@PANI composite showed excellent EM absorption capacity, making it a potential high-performance electromagnetic wave-absorbing material.
Article
Chemistry, Physical
Longqi Yang, Yan Wang, Zhao Lu, Runrun Cheng, Nian Wang, Yongfei Li
Summary: In order to solve the problem of electromagnetic pollution, we have successfully synthesized a multi-dimensional graphene-based aerogel decorated with one-dimensional carbon nanotubes and metal-organic framework derivatives. The composite material exhibits excellent microwave absorption properties due to its multi-dimensional gradient, defects, heterogeneous interfaces, and unique porous structure. The optimum absorption performance of -58.8 dB is achieved with a filler loading of 20 wt%, a thickness of 1.8 mm, and an effective absorption bandwidth of 7.6 GHz, covering the entire Ku-band.
Article
Chemistry, Inorganic & Nuclear
Guoxin Ding, Chenfeng Sun, Meiyi Wang, Guojun Cheng, Jun Liu, Yuexiang Hu
Summary: The construction of multihollow lightweight wave absorbing materials is a future goal. In this study, CoFe-LDH was grown on RGO surfaces and composites with different morphologies and wave-absorbing properties were obtained. The composites exhibited excellent microwave absorption performance.
INORGANIC CHEMISTRY COMMUNICATIONS
(2024)
Article
Chemistry, Physical
Luo Kong, Sihan Luo, Guiqin Zhang, Hailong Xu, Tong Wang, Jianfeng Huang, Xiaomeng Fan
Summary: For non-magnetic materials, polarization and conductivity loss are crucial factors affecting electromagnetic wave absorption properties. The study focuses on heterogeneous interfacial polarization, using carbon nanotubes/pyrolytic carbon hollow microspheres (CNTs/PyC HMs) with numerous interfaces. The crystallization degree of CNTs can be adjusted, leading to enhanced conductivity differences and interfacial polarization intensity. CNTs/PyC HMs with a special hollow structure exhibit excellent dielectric loss capability, making them suitable for electromagnetic wave absorption applications.
Article
Materials Science, Ceramics
Yinhe Lin, Majid Niaz Akhtar, Nidal H. Abu-Hamdeh, Smain Bezzina, Hoi Huynh Tan, Zhe Wang
Summary: A flower-like MoS2 (D) and Ni microsphere (M) composite absorber was successfully fabricated and showed synergistic performance in terms of absorption efficiency and reflection loss, suitable for microwave absorption applications.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Multidisciplinary
Li Chang, Yu-Ze Wang, Xin-Ci Zhang, Lin Li, Hua-Zhang Zhai, Mao-Sheng Cao
Summary: The advent of the intelligent era has brought convenience to our lives but also brought threats from electromagnetic radiation. It is urgent to develop new electromagnetic wave absorption materials with lightweight, strong absorption, tunable absorption frequency, and wideband absorption. In this study, a novel electromagnetic wave absorber was obtained by constructing La0.8CoO3-rGO nanocomposite. The hybridization ratio of La0.8CoO3 and rGO was found to affect the microwave absorption properties. The La0.8CoO3-rGO nanocomposite showed excellent absorption performance and potential for high-efficiency microwave absorbers.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2024)
Article
Nanoscience & Nanotechnology
Yue Wu, Yue Zhao, Ming Zhou, Shujuan Tan, Reza Peymanfar, Bagher Aslibeiki, Guangbin Ji
Summary: This study synthesized CuS@rGO aerogels and investigated their pore structure, absorption properties, radar cross section, and infrared emissivity by modulating the additive amounts and reduction methods. The results showed that the aerogels exhibited excellent absorption performance in the ultrabroad bandwidth, effectively reduced the radar cross section, and possessed thermal insulation and infrared stealth versatility.
NANO-MICRO LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Fan Zhang, Siyang Shang, Yaya Li, Bingbing Fan, Rui Zhang, Biao Zhao, Hongxia Lu, Chengliang Ma
Summary: This study presents a strategy for the controlled synthesis of MXene foams with tailored dielectric properties. The addition of reduced graphene oxide and NiO particles enables the tuning of the complex permittivity and permeability of the MXene-based composites. The resulting composites exhibit a minimal reflection loss at 7.5 GHz, highlighting their potential as lightweight and multifunctional microwave absorbers.
Article
Chemistry, Multidisciplinary
Bushi Dai, Tao Qi, Mengjie Song, Mingqian Geng, Yuxiang Dai, Yang Qi
Summary: In this study, carbon sphere/Fe3O4 nanocrystal composites were synthesized using a simple strategy to enhance the electromagnetic wave absorption performance of carbon spheres. The synthesized composite material exhibited excellent electromagnetic wave absorption properties and provided new ideas for the design of lightweight, ultra-thin carbon-based electromagnetic wave absorbent composites.
Article
Materials Science, Multidisciplinary
Chenxing Xin, Jing Zhang, Ton Peijs, Yan Li
Summary: A Fe3O4/rGO reinforced photocurable resin composite with a gyroid structure was fabricated by digital light processing (DLP) 3D printing. The composite, coated with Fe3O4/rGO nanoparticles, exhibited excellent microwave absorption performance and the opportunity for electromagnetic wave reflection/refraction/transmission.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Lingyun Kong, S. Lakshmana Kumar, Mohamad Reda A. Refaai, Ali Hassan, S. Geerthik, V. Mohanavel
Summary: By mixing magnetic nanoparticles with dielectric materials such as polymers, the researchers were able to control the complex permittivity and permeability of HoFeO3 nanoparticles. The aim of this study was to enhance the microwave absorption properties of HoFeO3 nanoparticles in the ku-band frequency by coating them with two different polymers with unique dielectric properties. The researchers found that coating HoFeO3 nanoparticles with Poly(EDOT-co-CIn) using the co-precipitation technique improved their impedance match and microwave absorption efficacy. The resulting HoFeO3/Poly (EDOT-co-CIn) nanocomposite showed excellent reflection loss and absorption bandwidth characteristics.
Article
Chemistry, Physical
Xiao-Ying Fu, Qi Zheng, Lin Li, Mao-Sheng Cao
Summary: Honeycomb-like MoSe2@reduced graphene oxide (RGO) composites were successfully constructed using a one-step solvothermal method, exhibiting properties of multi-band absorption. The optimized composite showed excellent microwave absorption performance, making it suitable for the development of efficient multifunctional EM wave absorbers.
Article
Engineering, Electrical & Electronic
Rajesh Kumar, Sachin Kumar, Binod Kumar Kanaujia
Summary: This paper proposes a Doherty power amplifier (DPA) structure based on Class-J power amplifier (PA) and Class-J(-1) PA for configurable Internet of Things (IoT) transmitters. The proposed DPA structure achieves wider bandwidth performance, high efficiency, and power gain flatness. Compared to existing DPAs, the proposed DPA exhibits higher efficiency, output power, and compact size.
INTERNATIONAL JOURNAL OF CIRCUIT THEORY AND APPLICATIONS
(2023)
Article
Chemistry, Physical
Ekata Saha, Gopala Ram Bhadu, Joyee Mitra
Summary: Developing bifunctional electrocatalysts for both oxygen and hydrogen evolution reactions (OER and HER) is crucial for clean fuel hydrogen production and renewable energy systems. This study successfully synthesized a series of Ni nanoclusters uniformly dispersed in heteroatom-doped graphitized carbon, demonstrating excellent catalytic activity and stability for OER and HER. Modulation of heteroatom dopants on the carbon matrix improved electron density redistribution and provided additional active sites, enhancing the electrocatalytic performance. This work presents a simplified approach for designing bifunctional electrocatalysts from supramolecular metallogels, opening new possibilities for energy applications.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Computer Science, Information Systems
Ke Wang, Chien-Ming Chen, Mohammad S. Obaidat, Saru Kumari, Sachin Kumar, Jinyi Long
Summary: In recent years, voice-interaction-based control systems have gained attention for implementing IIoT technologies in industrial control systems. The development of automated semantic understanding is important for remote voice control and intelligent management and control. Sorting technologies are crucial in voice-interaction-enabled industrial central control systems. Deep learning methods have been popular for optimizing conventional retrieval-based question answering. This study proposes three deep semantic sorting models based on deep learning, which outperformed state-of-the-art text matching methods in candidate document sorting.
IEEE INTERNET OF THINGS JOURNAL
(2023)
Article
Computer Science, Information Systems
Ghanshyam Singh, Sachin Kumar, Ajay Abrol, Binod Kumar Kanaujia, Vijay Kumar Pandey, Mohamed Marey, Hala Mostafa
Summary: In this paper, a frequency reconfigurable multiband MIMO antenna is developed for 5G communication systems. The antenna element consists of a microstrip line, a divided monopole, and a ground plane. The antenna design includes a split-ring resonator (SRR) for multiple 5G application bands and an RF PIN diode for frequency diversity. The MIMO antenna is designed with improved inter-element isolation by orthogonally locating four antenna elements with connected ground planes. The prototype antenna, developed on an FR-4 substrate, matches the simulated outcomes and has an overall footprint of 70 x 70 x 1.6 mm(3).
Article
Computer Science, Information Systems
Divya Upadhyay, Puneet Garg, Sultan Mesfer Aldossary, Jana Shafi, Sachin Kumar
Summary: In recent years, the IoT and wireless sensor networks have been widely used in healthcare applications, aiming to reduce human errors and improve the accuracy of illness analysis. This paper proposes an IoT-based health monitoring system that can monitor various parameters and provide timely advice to parents or guardians through SMS or emails. The system also employs a clock synchronisation technique to improve the performance and accuracy of the monitoring system.
Review
Immunology
Kiran Singh, Deepa Mehta, Shaurya Dumka, Aditya Singh Chauhan, Sachin Kumar
Summary: Viral quasispecies are distinct but closely related mutants formed by recombination, mutations, competition, and selection pressure. Their origin is attributed to the error-prone replication by polymerase and mutants of RNA replicators. The impact of quasispecies for major human pathogens is reviewed, and the rapid changes in geographical landscapes favor the origin and selection of mutants, posing a significant risk to public health.
Article
Chemistry, Physical
Kinjal K. Joshi, Pratik M. Pataniya, Gopala Bhadu, C. K. Sumesh
Summary: Cu2CoSnS4, Cu2SnS3, Cu2CoS4, Co2SnS3, Cu2S, CoS2, and SnS2 were synthesized through a simple solid-phase approach. The characterized results indicate the formation of pure phase and porous morphology. Among them, Cu2CoSnS4 shows excellent catalytic activity with a low overpotential and high current density for the hydrogen evolution reaction. Moreover, Cu2CoSnS4 exhibits lower Tafel slope and charge transfer resistance compared to other chalcogenide-based electrodes. It also demonstrates good stability under a specific current density in an acidic environment.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Computer Science, Information Systems
Prince Silas Kwesi Oberko, Tianang Yao, Hu Xiong, Saru Kumari, Sachin Kumar
Summary: This article presents a secure access design for smart grids based on the Ethereum blockchain, resolving security issues in the smart energy system. The design includes functions such as identity verification, public-key storage, and revocable lists, ensuring system security under complex theory and multi-attack scenarios.
JOURNAL OF INTERNET TECHNOLOGY
(2023)
Correction
Materials Science, Multidisciplinary
Sachin Kumar, Shiv Brat Singh
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Sachin Kumar, Shiv Brat Singh
Summary: A low-carbon low-alloy steel suitable for Q&P processing was designed by considering the influence of alloying elements on various aspects of transformation and microstructure. The designed steel showed improved strength and elongation due to a more effective exploitation of the TRIP effect. The TRIP behavior depended not only on the amount and carbon content of retained austenite, but also on the morphology of austenite and the characteristics of the surrounding phases.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2023)
Article
Engineering, Electrical & Electronic
Meznah M. Alanazi, Loubna Ouahid, Jameelah S. Al Shahrani, M. A. Abdou, Sachin Kumar
Summary: This paper presents new soliton solutions for ion sound and Langmuir waves (ISALWs) using the Atangana-Baleanu (AB) fractional. The extended sub-equation method (ESEM) is applied to obtain various soliton solutions in trigonometric functions, hyperbolic functions, and other functional forms. The obtained soliton solutions show different shapes, including bell-shaped, single-soliton-shaped, and mixed-type solitons, which are examined using three-dimensional graphics.
OPTICAL AND QUANTUM ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Sachin Kumar, Monika Niwas
Summary: In this work, the perturbed Chen-Lee-Liu (CLL) equation is studied using the generalized Riccati equation mapping method. Soliton solutions are obtained by applying the traveling wave transformation and analyzing the real and imaginary parts of the perturbed CLL equation. The obtained solutions exhibit various dynamic behaviors such as solitary wave solitons, mixed periodic solitons, anti-bell shape solitons, solitary wave with lump solitons, singular type solitons, and periodic wave solitons.
OPTICAL AND QUANTUM ELECTRONICS
(2023)
Article
Regional & Urban Planning
Sachin Kumar, Neeraj Dhiman, Honey Kanojia, Richa Joshi
Summary: This study aims to explore the factors influencing the discontinuance intentions of millennials to use hotel booking apps. A quantitative technique was used to collect data from tourists, and partial least square structural equation modeling (PLS-SEM) was used to validate the proposed model. The study found that significant predictors of discontinuance intentions include usage barrier, values barrier, risk barrier, lack of facilitating conditions, and digital self-efficacy. The findings provide valuable insights for tourism stakeholders and app developers to understand the challenges faced by users of such hotel booking apps.
Article
Biology
Preeti Saini, Bharti Nagpal, Puneet Garg, Sachin Kumar
Summary: This study aims to assess the accuracy of a prediction model for sugarcane yield based on remote sensing-derived products and climate data. By using regression analysis on historical sugarcane yield, climatic parameters, and vegetation condition index (VCI) of 75 districts in six major sugar-producing states of India, a highly accurate empirical model was developed. The results show that incorporating maximum and minimum temperature parameters with remote sensing-derived vegetation indices significantly improves the coefficient of determination of the prediction model.
BRAZILIAN ARCHIVES OF BIOLOGY AND TECHNOLOGY
(2023)
Article
Engineering, Civil
Xindi Ma, Qi Jiang, Mohammad Shojafar, Mamoun Alazab, Sachin Kumar, Saru Kumari
Summary: This paper introduces the challenges of using federated learning in IoT-enabled Maritime Transportation System (MTS) for intelligent control and routing planning. It proposes a mechanism called DisBezant to achieve secure and Byzantine-robust federated learning. The mechanism includes a credibility-based mechanism to resist Byzantine attacks and a privacy-preserving gradient aggregation protocol based on a secure two-party calculation protocol. The effectiveness of DisBezant is verified through experiments.
IEEE TRANSACTIONS ON INTELLIGENT TRANSPORTATION SYSTEMS
(2023)