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# Electromagnetics - Science topic

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Publications related to Electromagnetics (10,000)
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High-quality-factor (high-Q-factor) electromagnetic resonance plays an important role in sensor applications. Previously proposed gas refractive index sensors are often limited by the large cavity length or microscale fabrication process in practical applications. Recently, ultra-high Q factor resonance based on the bound state in the continuum (BI...
Article
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The modular multilevel converter (MMC) based high-voltage dc (HVDC)-connected offshore wind farm (OWF) is power electronic converter dominated power system, where the conventional current differential protection may not operate effectively. Based on the basic operation principle of the current differential relay, this paper points out that the phas...
Article
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The active/passive heatsinks have recently garnered much attention due to their benefit to keep the temperature of the electronic device and PCB/ICs in a certain range. They are expected both to perform a maximum cooling thermally and to have a minimum of the radiation in electromagnetic terms since it causes electromagnetic interference (EMI) in d...
Article
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In this paper, a simultaneous application of geometric modification on patch elements and electromagnetic band gap (EBG) electromagnetic bandgap structures (hybrid method) has been suggested for 3.5 GHz wireless communication applications, to minimize the mutual coupling between radiating elements of microstrip array antennas. The suggested EBG slo...
Article
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Nowadays, smart devices have become a major part of human life, and this need has led to an increase in the demand for these devices, prompting major telecommunications companies to compete with each other to acquire the bulk of this market. This competition led to a significant increase in the number of mobile towers, to expand the coverage area....
Conference Paper
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A topological photonic insulator (TPI) provides a platform for the robust transfer of electromagnetic (EM) energy against structural disorder and sharp bendings. Here, we examine the robust propagation of the THz waves in the presence of 4 sharp bendings as well as unit cell defect present in the topological channel. This work would be useful for d...
Article
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The rational design of magnetic composites has great potential for electromagnetic (EM) absorption, particularly in the low‐frequency range of 2–8 GHz. However, the scalable synthesis of such magnetic absorbers with both high magnetic content and good dispersity remains challenging. In this study, a confined diffusion strategy is proposed to fabric...
Article
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Programmable Logic Controller (PLC) adalah perangkat elektronik yang digunakan untuk memantau dan mengontrol suatu sistem proses otomatis. Dalam modul PLC, kabel dan komponen memainkan peran penting dalam memastikan kinerja dan operasi yang efisien. Kabel yang digunakan dalam modul PLC biasanya berupa kabel industri yang tahan terhadap lingkungan y...
Article
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Electromagnetic (EM) waves that bypass obstacles to achieve focus at arbitrary positions are of immense significance to communication and radar technologies. Small-sized and low-cost metasurfaces enable the accomplishment of this function. However, the magnitude-phase characteristics are challenging to analyze when there are obstacles between the m...
Preprint
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Pre-merger gravitational-wave (GW) sky-localisation of binary neutron star (BNS) and neutron star black hole (NSBH) coalescence events, would enable telescopes to capture precursors and electromagnetic (EM) emissions around the time of the merger. We propose a novel astrophysical scenario that could provide early-warning times of hours to days befo...
Preprint
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For the electromagnetic field in (D+1)-dimensional locally de Sitter (dS) spacetime, we analyze the effects of a generalized cosmic string type defect on the vacuum expectation value of the energy-momentum tensor. For the Bunch-Davies vacuum state, the topological contributions are explicitly extracted in both the diagonal and off-diagonal componen...
Article
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Modul masukan PLC (Programmable Logic Controller) adalah bagian dari sistem PLC yang bertanggung jawab untuk menerima masukan dari sensor atau perangkat lain dan mengirimkan informasi ini ke unit kontrol utama PLC. Modul masukan memiliki banyak jenis, seperti input digital yang menerima masukan berupa sinyal biner, input analog yang menerima masuka...
Article
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Fe3GeTe2 provides an ideal system for the study of itinerant ferromagnetism. However, the Curie temperature (Tc) below room temperature limits its further in‐depth research and wide applications. Here, the Tc of 224 K for Fe3GeTe2 is greatly increased to 496 K for Fe3GeTe2/FeTe2/Fe3Ge by temperature‐induced self‐decomposition doping, contributing t...
Article
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For the mineral exploration in complex terrain areas, the semi-airborne transient electromagnetic (SATEM) technology is one of the most powerful methods due to its high efficiency and low cost. However, since the mainstream SATEM systems only observe the component dBz/dt and the data are usually processed by simple interpretation or one-dimensional...
Preprint
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The paper focuses on applying the octonions to study the wave-particle duality in the electromagnetic and gravitational fields, exploring the influencing factors and special cases of the wave-particle duality. J. C. Maxwell first utilized the quaternions to describe the electromagnetic theory. Nowadays , some scholars are able to depict simultaneou...
Preprint
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Neural operators have emerged as a powerful tool for solving partial differential equations in the context of scientific machine learning. Here, we implement and train a modified Fourier neural operator as a surrogate solver for electromagnetic scattering problems and compare its data efficiency to existing methods. We further demonstrate its appli...
Article
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As an important component of hydrogen fuel cell vehicles, the air compressor with an air foil bearing rotates at tens of thousands of revolutions per minute. The heat generation concentration problem caused by the high-speed motor loss seriously affects the safe and normal operation of the motor, so it is very important to clarify the loss distribu...
Article
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As permanent magnet claw pole machine (PMCPM) is designed with a complex 3D magnetic structure, the 3D finite element method (FEM) is commonly used for its accurate performance analysis. However, using 3D FEM will consume a long time in the initial design stage. Its analysis time can be saved greatly by using the analytical method (AM) or equivalen...
Preprint
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In this work, we introduce a Berry phase model, which is very important in physics relative to the frontals in de Sitter-2 space. We also examine electromagnetic curves associated with orthonormal vectors of spacelike frontals and timelike frontals in de-Sitter 2-space. We give the Rytov curves by using orthonormal frame of spacelike frontals and t...
Article
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We discuss a method of analysis of symmetric electromagnetic components with magnetic media based on magnetic group theory. In this description, some of the irreducible corepresentations assume complex values exp(iθ) with the real parameter θ. A possible physical interpretation of this parameter is given. We demonstrate the application of the symme...
Article
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Variable damping shock absorbers have received extensive attention for their efficient vibration reduction performance, and air springs have also been widely used in high-end commercial vehicles due to their nonlinear stiffness characteristics. This paper presents a novel semi-active cab suspension integrated with an air spring and a variable dampi...
Preprint
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The ALLIANCE code is developed to solve a new set of four-dimensional electromagnetic drift-kinetic equations in slab geometry [J. Plasma Phys. 88 905880117 (2022)]. The nonlinear equations are useful for the study of magnetized plasma systems at scales comparable to, or larger than the ion gyroradius. In particular, it is suited for the study the...
Preprint
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We discuss the potential of using detectors aimed for searching long-lived particles~(LLP) at the high-luminosity LHC run, to probe the neutrino dipole models. This is achieved by taking the heavy neutral leptons~(HNL) of the models as candidates of the LLPs.Taking into account the dipole couplings to the weak bosons, $d_{W,Z}$, which control the p...
Article
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The transportation of oil and gas through pipelines is an integral aspect of the global energy infrastructure. It is crucial to ensure the safety and integrity of these pipelines, and one way to do so is by utilizing an inspection tool called a smart pig. This paper reviews various smart pigs used in steel oil and gas pipelines and classifies them...
Article
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It is a challenge to detect pre-seismic anomalies by using only one dataset due to the complexity of earthquakes. Therefore, it is a promising direction to use multiparameteric data. The earthquake cross partial multi-view data fusion approach (EQ-CPM) is proposed in this paper. By using this method, electromagnetic data and seismicity indicators a...
Article
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Returns of gravitational wave astronomy will largely benefit from the detection and identification of electromagnetic (EM) signatures to gravitationalwave sources. Kilonovae (KNe) are promising EM counterparts to compact binary mergers, offering to astronomers and nuclear astrophysicists a unique window to advance knowledge on the heavy-element nuc...
Article
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In this paper, a weighted arctangent function is used in conjunction with the spectral method to generate a land–sea junction composite rough surface under the spatially homogeneous and time-stationary hypotheses. The exponential correlation function and the Joint North Sea Wave Project (JONSWAP) spectrum, combined with an experiment-verified shoal...
Article
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Dynamic characteristics of large permanent magnet direct‐drive generators (PMDGs) considering electromagnetic–structural coupling effects are analyzed in this study. Using the conformal mapping method, the scalar magnetic potential of the air gap magnetic field considering the slot effect is calculated. On the basis of the discrete current element...
Article
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BaTiO3 (BTO) nanoparticles produced by wet chemistry methods were embedded in several types of flexible materials in order to fabricate flexible electronic devices. Starting from the produced nanoparticle dielectric properties, flexible material dielectric properties were tested for high electromagnetic frequencies (30 GHz–2 THz) using time domain...
Preprint
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We propose a spatio-temporal mixing kinematic data estimation method to estimate the shape of the colon with deformations caused by colonoscope insertion. Endoscope tracking or a navigation system that navigates physicians to target positions is needed to reduce such complications as organ perforations. Although many previous methods focused to tra...
Article
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The ForwArd Search ExpeRiment (FASER) is an experiment searching for new light and weakly-interacting particles at CERN’s Large Hadron Collider. FASER is composed of different sub-detectors, including silicon microstrip detectors, scintillator counters and an electromagnetic calorimeter. In this paper, a new preshower detector for the FASER experim...
Article
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Electromagnetic (EM) wave pollution is harmful to human health and environment, thus it is absolutely important to develop new electromagnetic wave absorbing materials. MAX phases have been attracted more attention as a potential candidate for electromagnetic wave absorbing materials due to their high conductivity and nanolaminated structure. Herei...
Article
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We determined the emissivity of molten oxides using a commercially available pyrometer combined and an electromagnetic levitation system based on the liquid Fe emissivity and its melting temperature. Our method for determining molten oxide emissivity is based on immiscible molten oxides and liquid Fe. From the processes, we obtained 0.80 ± 0.03 for...
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Introduction: High-fidelity simulation of the radar echo from the wind turbine (WT) for accurate acquisition of Doppler features, is the key issue in addressing radiation interference from the wind farm on the nearby radar station. In view of the limitation of the conventional scattering center-based equivalent model to reflect the complex surface...
Article
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Radio holographic measurements using the MeerKAT telescope are presented for each of its supported observing bands, namely UHF (544–1087 MHz), L (856–1711 MHz), and S (1750–3499 MHz). Because the UHF -band receiver design is a scaled version of that of the L band, the electromagnetic performance in these two bands are expectedly similar to one anot...
Article
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A metodologia adotada por muitas escolas para a disciplina de física resulta no corpo discente a sensação de que todo o conhecimento por ela transmitido não está contido no seu cotidiano, ou pertence a uma realidade totalmente diferente da sua, resultando em questionamentos sobre o porquê se deve aprender aquele conteúdo e sua utilização na vida. E...
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This work investigated the dynamic responses and evaluated the performance of a two-degree-of-freedom (2DOF) coupled coil-magnet electromagnetic vibration harvester excited at low frequencies. Three different connection modes with individual, in-series, and in-parallel configurations of the transduction coils were considered. Such approach was take...
Preprint
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Keywords: Lorentz invariance, action, relativistic mechanics, post-Newtonian forces, electromagnetic induction, accelerated frames, inertial forces, Mach's principle, mass anisotropy // This paper is about a novel extension to relativistic particle mechanics. This extension is exploiting the usual assumption that Hamilton’s action be a Lorentz inv...
Preprint
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Based on a microscopic model, we use a functional integral approach to evaluate the quantum interaction energy between two neutral atoms. Each atom is coupled to the electromagnetic (EM) field via a dipole term, generated by an electron bound to the nucleus via a harmonic potential. We show that the resulting expression for the energy becomes the V...
Article
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Insight into the plasma properties of high-speed ionized flows is key for the validation of predictive aerothermodynamic tools for atmospheric entry applications, namely plasma radiation which will be highly dependent on the flow electron densities, which accordingly need to be accurately estimated. We performed an extensive review on past re-entry...
Article
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Over the past few years, due to the shortage of fossil fuels and their unwanted environmental impacts, the use of renewable energy has vastly increased. Among them is wind power, which has been at the center of attention as one of the most important renewable energies. Many studies have been conducted regarding wind farms with variable speeds. Amon...
Article
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Although vector potentials are more intrinsic physical quantities than magnetic and electric fields, measuring them macroscopically is difficult. A double-nested Helmholtz-type vector potential coil, consisting of an elongated solenoid coil wound around a cylinder, and producing a uniform magnetic vector potential, was developed in this study. The...
Preprint
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We study radiative corrections to neutron beta decay and low-energy (anti)neutrino-nucleon scattering within a top-down effective field theory approach. As it was recently shown, a few electromagnetic and electroweak low-energy coupling constants in heavy-baryon chiral perturbation theory are yet to be determined. Performing matching to the four-fe...
Article
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This manuscript has analyzed a gold-coated photonic crystal fiber-based single-polarization filter with D-shape for a span of wavelength from 1.408 to 1.652 μm with particular applications in S + U bands. An asymmetric arrangement of air holes has been adopted to allow high birefringence and cross-talk. The filter displays strong filtering characte...
Article
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Multifunctional metasurface triggers great interest due to their potential ability to manipulate the propagation of electromagnetic (EM) waves. Here, we propose a novel design of metasurface to realize EM wave magnitude, phase, and radiation manipulation. The metasurface unit cell consists of different structures with various functions. Double-squa...
Article
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The stimulated reservoir volume (SRV) technology extends conventional fracturing technology. Understanding how to effectively and accurately determine modified fracture shape and volume is the key point to evaluating the stimulation effect. Using electromagnetic detection technology can provide a new option for measuring these parameters. By the fi...
Preprint
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Long Term Evolution (LTE) signal is ubiquitously present in electromagnetic (EM) background environment, which make it an attractive signal source for the ambient backscatter communications (AmBC). In this paper, we propose a system, in which a backscatter device (BD) introduces artificial Doppler shift to the channel which is larger than the natur...
Preprint
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In dense stellar clusters like galactic nuclei and globular clusters stellar densities are so high that stars might physically collide with each other. In galactic nuclei the energy and power output can be close, and even exceed, to those from supernovae events. We address the event rate and the electromagnetic characteristics of collisions of main...
Article
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Pengelasan merupakan proses penyambungan secara permanen atau lebih material logam dengan ikatan metalurgi yang dihasilkan pada waktu logam dalam keadaan lumer atau cair. AA5052 jenis paduan dengan kekuatan tertinggi dari kelas yang lebih tidak dapat diolah panas. Kekuatan kelelahannya lebih tinggi dari kebanyakan kelas aluminium lainnya. Alloy 505...
Article
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This paper is concerned with the extractions of electromagnetic characteristic modes (CMs) for lossless dielectric bodies, for which spurious modes are prone to generate using the traditional definition of CMs based on the Poggio–Miller–Chang–Harrington–Wu–Tsai (PMCHWT) equations. It is found that the impedance matrix of PMCHWT equations cannot dis...
Preprint
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Ultra-stripped supernovae are different from other terminal explosions of massive stars, as they show little or no ejecta from the actual supernova event. They are thought to occur in massive binary systems after the exploding star has lost its surface through interactions with its companion. Such supernovae produce little to no kick, leading to th...
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The first evaluation of an ultra-high granularity digital electromagnetic calorimeter prototype using 1.0–5.8 GeV/c electrons is presented. The 25 × 10 ⁶ pixel detector consists of 24 layers of ALPIDE CMOS MAPS sensors, with a pitch of around 30 μm, and has a depth of almost 20 radiation lengths of tungsten absorber. Ultra-thin cables allow for a v...
Article
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We examine the effect of resonant absorption of electromagnetic signals in a silicon semiconductor plasma layer when the dielectric plate is placed behind it both experimentally and numerically. It is shown that such plate acts as a dielectric resonator and can significantly increase the electromagnetic energy absorption in the semiconductor for ce...
Article
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We report a measurement of the transition amplitude ratio χ of an electric quadrupole ( E2 ) to a magnetic dipole ( M1 ) of the 6P 1/2 →6P 3/2 transition in atomic thallium. We utilized the electromagnetically induced transparency (EIT) mechanism and the sideband-bridging technique to resolve the isotopic transitions and their hyperfine manifold. O...
Preprint
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It is known that materials with broken time-reversal symmetry can have Hall responses. Here we show that in addition to the conventional currents, either linear or nonlinear in the electric field, another Hall current can occur in the time-reversal breaking materials within the second-order response to in-plane electric and vertical magnetic fields...
Preprint
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Knowledge of aquifer parameters is essential for managing groundwater resources. Parameters such as porosity and specific yield are among the basic features to describe the hydrogeological conditions of a region. In this research, the Electromagnetic method is compared with Geoelectrical soundings. Data collection was made available by field reconn...
Article
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We have observed a significant enhancement in the energy deposition by 25– $$100~\textrm{GeV}$$ 100 GeV photons in a $$1~\textrm{cm}$$ 1 cm thick tungsten crystal oriented along its $$\langle 111 \rangle$$ ⟨ 111 ⟩ lattice axes. At $$100~\textrm{GeV}$$ 100 GeV , this enhancement, with respect to the value observed without axial alignment, is more t...
Article
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A total artificial heart (TAH) represents a challenge in medical science to provide a survival perspective for patients with severe cardiac problems. Although cardiac transplantation represents the optimal therapeutic solution for end-stage heart failure, its application is limited by organ shortages. However, innovative technologies that can fit t...
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In order to improve the energy conversion performance and efficiency of the bi-stable piezoelectric-electromagnetic composite energy collector, based on the typical piezoelectric- electromagnetic composite energy collector, a tri-stable piezoelectric-electromagnetic composite energy collector with electromagnetic power generation device was develop...
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Since the CSES (China Seismo-Electromagnetic Satellite) has been in orbit, it has detected a large number of constant-frequency electromagnetic disturbances (CFEDs), which are horizontal lines on the spectrum. In this paper, we present an algorithm for automatic recognition of CFEDs based on computer vision technology. The relevant results are of g...
Article
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With a view to reducing harmonic content in electrical power systems, and, consequently, improving power quality level, filters and other harmonic compensation devices are widely used. In the category of filters, they can be distinguished into two classes that are related to the operating mode, active or passive, both widely known and applied in el...
Article
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We extend the three-dimensional noncommutative relations of the position and momentum operators to those in the four dimension. Using the Seiberg-Witten (SW) map, we give the Heisenberg representation of these noncommutative algebras and endow the noncommutative parameters associated with the Planck constant, Planck length and cosmological constant...
Article
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We have developed an algorithm dedicated to timing reconstruction in highly granular calorimeters (HGC). The performance of this algorithm is evaluated on an electromagnetic calorimeter (ECAL) with geometries comparable to the electromagnetic compartment (CE-E) of the CMS endcap calorimeter upgrade at HL-LHC and conceptual Particle Flow oriented EC...
Preprint
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There is significant uncertainty about the potential effects of a high-altitude electromagnetic pulse (HEMP) detonation on the bulk electric system. This study attempts to account for such uncertainty, in using Monte-Carlo methods to account for speculated range of effect of HEMP contingency. Through task parallelism and asynchronous processing tec...
Article
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A measurement of the inclusive cross section of in-flight electron-positron annihilation to photons, e+e−→γγ, is presented using the PADME detector at the Laboratori Nazionali di Frascati. A beam of 430 MeV positrons, corresponding to a center-of-mass energy of 20 MeV, strikes a thin diamond target. The two photons produced in the interaction are d...