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Articoli di riviste sul tema "Electromagnetism – materials"

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Autore: Grafiati

Pubblicato: 25 luglio 2024

Ultima modifica: 31 luglio 2024

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1

Xiong, Guang Jie, e Ling Li. "Finite Element Analysis of Electromagnetic Device in Magnetorheological Fluid Brake". Applied Mechanics and Materials 268-270 (dicembre 2012): 1448–52. http://dx.doi.org/10.4028/www.scientific.net/amm.268-270.1448.

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Magnetorheological fluid (MRF) Brake is a newly-developed intelligent brake in which traditional mechanical brake friction pairs are replaced by MRF materials and the electromagnetism devices are very important components. The controllable magnetic fields are generated by electromagnetism devices which can make MRF materials create related braking torque to control the braking performance of the MRF Brake. In this paper, the electromagnetism device consists of several coil sets which can generate electromagnetic fields for MRF Brake. By using finite element analysis, the magnetic fields generated by electromagnetism devices are compared analytically under the different conditions, and then the optimum parameters are obtained such as coil arrangements, excitation currents and air gap distances and etc. All these evidences are helpful to design the structure of electromagnetism devices in MRF Brake.

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2

Ciarlet Jr., Patrick, François Lefèvre, Stéphanie Lohrengel e Serge Nicaise. "Weighted regularization for composite materials in electromagnetism". ESAIM: Mathematical Modelling and Numerical Analysis 44, n. 1 (3 novembre 2009): 75–108. http://dx.doi.org/10.1051/m2an/2009041.

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3

Nicolet, A., F. Zolla, Y. Ould Agha e S. Guenneau. "Geometrical transformations and equivalent materials in computational electromagnetism". COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 27, n. 4 (11 luglio 2008): 806–19. http://dx.doi.org/10.1108/03321640810878216.

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PurposeThis paper aims to review various techniques used in computational electromagnetism such as the treatment of open problems, helicoidal geometries and the design of arbitrarily shaped invisibility cloaks. This seemingly heterogeneous list is unified by the concept of geometrical transformation that leads to equivalent materials. The practical set‐up is conveniently effected via the finite element method.Design/methodology/approachThe change of coordinates is completely encapsulated in the material properties.FindingsThe most significant examples are the simple 2D treatment of helicoidal geometries and the design of arbitrarily shaped invisibility cloaks.Originality/valueThe paper provides a unifying point of view, bridging several techniques in electromagnetism.

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4

Zhang, Zidong, Yaman Zhao, Guohua Fan, Wenjin Zhang, Yao Liu, Jiurong Liu e Runhua Fan. "Paper-based flexible metamaterial for microwave applications". EPJ Applied Metamaterials 8 (2021): 6. http://dx.doi.org/10.1051/epjam/2020016.

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Metamaterial has become a hotspot in many research fields, including electromagnetism, thermodynamics and mechanics, as it can offers additional design freedom for material to obtain novel properties. Especially for the electromagnetic devices, various interesting electromagnetic properties which cannot be found in nature materials can be realized, such as negative refraction, invisible cloak, etc. Herein, we provide an overview of paper-based metamaterial for microwave application. This work reviews the metamaterial realized on paper substrate, including the fabrication techniques, application fields, as well as the outlook on future directions of the paper-based metamaterial for the readership.

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5

Achille Ecladore, Tchahou Tchendjeu, Yungho Edickson Bobo e Nfah Eustace Mbaka. "Design and Realization of a Controlled Electromagnetic Breaking System". Journal of Engineering 2023 (14 agosto 2023): 1–12. http://dx.doi.org/10.1155/2023/1426506.

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Industrial machines with sharp moving blades are extremely dangerous to workers. These machines often rotate for some time (called the run-down time) before completely stopping due to little or no brakes. In the case where brakes are used, they are mechanical in nature and are associated with problems of wear out and frequent maintenance among others. In this paper, we proposed a mathematical model and implementation of an electromagnet and design and construction of a mechanical support frame and a controller for the electromagnetic braking system. The electromagnetic braking system works on the principle of electromagnetism. To realize the semicircular electromagnets, we coil the gauge wires several times around a ferromagnetic core material. The electromagnet was connected to a 12 V 7 Ah battery and was used to lift a load whose mass and corresponding weight were predetermined using a scale balance. The magnetic force generated was equal to the amount of maximum load it could lift. The mechanical frame, on which the electromagnets, motor, battery, switches, and chain drive system were mounted, was designed using SolidWorks and constructed by measuring, cutting, and joining of iron materials. A microcontroller and a power MOSFET were used in the control circuit to drive the electromagnet. Major results such as the realized electromagnets and the magnitude of the electromagnetic force (1.43 N) produced by the electromagnets are presented. The mechanical frame and the control circuit are also presented. The braking force was greater than the rotation torque of the disc, and hence braking was achieved.

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6

Luo, Zhi Ping, Chao Liu e Ma Ji Luo. "Study on Skin Effect in PEMFC with Dynamic Current". Advanced Materials Research 347-353 (ottobre 2011): 3246–50. http://dx.doi.org/10.4028/www.scientific.net/amr.347-353.3246.

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The main materials of polymer electrolyte membrane fuel cell (PEMFC) are carbon (C) and Stainless Steel (Fe). The dynamic current of PEMFC will cause nonuniform distribution of current density in these materials. Simple models which materials are carbon (C) and Stainless Steel (Fe) are used in testing. A testing device using electromagnetic method was set up to detect the induced electromotive force in models. Theoretical calculations using electromagnetism and mathematics are set up to calculate the current density distribution of models. It is shown from the comparison between calculated values of the formula and measured values that the dynamic current of PEMFC will cause skin effect.

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7

Boller, C., I. Altpeter, G. Dobmann, M. Rabung, J. Schreiber, K. Szielasko e R. Tschuncky. "Electromagnetism as a means for understanding materials mechanics phenomena in magnetic materials". Materialwissenschaft und Werkstofftechnik 42, n. 4 (aprile 2011): 269–78. http://dx.doi.org/10.1002/mawe.201100761.

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8

Dmitriyev, Valery P. "Elasticity and Electromagnetism". Meccanica 39, n. 6 (dicembre 2004): 511–20. http://dx.doi.org/10.1007/s11012-004-6057-8.

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9

Lohrengel, Stephanie, e Serge Nicaise. "SINGULARITIES AND DENSITY PROBLEMS FOR COMPOSITE MATERIALS IN ELECTROMAGNETISM". Communications in Partial Differential Equations 27, n. 7-8 (7 gennaio 2002): 1575–623. http://dx.doi.org/10.1081/pde-120005849.

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10

Dobrzynski, Léonard. "Interface response theory of electromagnetism in composite dielectric materials". Surface Science Letters 180, n. 2-3 (febbraio 1987): A57. http://dx.doi.org/10.1016/0167-2584(87)90216-7.

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11

Dobrzynski, Léonard. "Interface response theory of electromagnetism in composite dielectric materials". Surface Science 180, n. 2-3 (febbraio 1987): 505–17. http://dx.doi.org/10.1016/0039-6028(87)90223-8.

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12

Gralak, Boris. "Negative index materials: at the frontier of macroscopic electromagnetism". Comptes Rendus. Physique 21, n. 4-5 (16 dicembre 2020): 343–66. http://dx.doi.org/10.5802/crphys.29.

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13

Gong, Yansheng, e Na Liu. "Advanced Numerical Methods for Graphene Simulation with Equivalent Boundary Conditions: A Review". Photonics 10, n. 7 (22 giugno 2023): 712. http://dx.doi.org/10.3390/photonics10070712.

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Since the discovery of graphene, due to its excellent optical, thermal, mechanical and electrical properties, it has a broad application prospect in energy, materials, biomedicine, electromagnetism and other fields. A great quantity of researches on the physical mechanism of graphene has been applied to engineering in electromagnetism and optics. To study the properties of graphene, different kinds of numerical methods such as the mixed finite element method (Mixed FEM), the mixed spectral element method (Mixed SEM), Method of Auxiliary Sources (MAS), discontinuous Galerkin time-domain method (DGTD) and interior penalty discontinuous Galerkin time domain (IPDG) have been developed for simulating the electromagnetic field effects of graphene and equivalent boundary conditions such as impedance transmission boundary condition (ITBC), surface current boundary condition (SCBC), impedance matrix boundary condition (IMBC) and surface impedance boundary condition (SIBC) have been employed to replace graphene in the computational domain. In this work, the numerical methods with equivalent boundary conditions are reviewed, and some examples are provided to illustrate their applicability.

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Saxena, Prashant. "On the General Governing Equations of Electromagnetic Acoustic Transducers". Archive of Mechanical Engineering 60, n. 2 (1 giugno 2013): 231–46. http://dx.doi.org/10.2478/meceng-2013-0015.

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In this paper, we present the general governing equations of electrodynamics and continuum mechanics that need to be considered while mathematically modelling the behaviour of electromagnetic acoustic transducers (EMATs). We consider the existence of finite deformations for soft materials and the possibility of electric currents, temperature gradients, and internal heat generation due to dissipation. Starting with Maxwell’s equations of electromagnetism and balance laws of nonlinear elasticity, we present the governing equations and boundary conditions in incremental form in order to solve wave propagation problems of boundary value type.

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15

Ding, Yu Bin, e Guo Ping Zhang. "Advances in Research on Left-Handed Met Materials". Applied Mechanics and Materials 130-134 (ottobre 2011): 1016–19. http://dx.doi.org/10.4028/www.scientific.net/amm.130-134.1016.

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Left-handed metamaterials, of which the dielectric constant and the magnetic permeability are sim-ultaneously negative , are a kind of electromagnetism materials. This paper gives a introduction to the basic principles of left-handed materials , and expatiates on the preparation ways of this materials in microwave region ,infrared region and visible light region.

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16

Gibbons, Gary, e Marcus Werner. "The Gravitational Magnetoelectric Effect". Universe 5, n. 4 (1 aprile 2019): 88. http://dx.doi.org/10.3390/universe5040088.

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Electromagnetism in spacetime can be treated in terms of an analogue linear dielectric medium. In this paper, we discuss the gravitational analogue of the linear magnetoelectric effect, which can be found in multiferroic materials. While this is known to occur for metrics with non-zero mixed components, we show how it depends on the choice of spatial formalism for the electromagnetic fields, including differences in tensor weight, and also on the choice of coordinate chart. This is illustrated for Langevin–Minkowski, four charts of Schwarzschild spacetime, and two charts of pp gravitational waves.

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17

Ericksen, J. L. "Electromagnetism in steadily rotating matter". Continuum Mechanics and Thermodynamics 17, n. 5 (27 gennaio 2006): 361–71. http://dx.doi.org/10.1007/s00161-005-0003-4.

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18

ESCOLANO, JOSÉ, e BASILIO PUEO. "ACOUSTIC EQUATIONS IN THE PRESENCE OF RIGID POROUS MATERIALS ADAPTED TO THE FINITE-DIFFERENCE TIME-DOMAIN METHOD". Journal of Computational Acoustics 15, n. 02 (giugno 2007): 255–69. http://dx.doi.org/10.1142/s0218396x07003287.

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Finite-difference time-domain (FDTD) method has been successfully developed to model electromagnetic systems in recent years. Since acoustics and electromagnetism share certain undulatory properties, a natural adaptation of this technique has been developed too. Several acoustics problems, such as room acoustics, require the use of fibrous tangles to attenuate the propagation speed of sound waves. Notwithstanding, although free air acoustic propagation is known, FDTD technique is not developed yet to model fibrous materials. To characterize this behavior, only a few and measurable set of parameters must be considered. In this paper, a new approach for modeling fibrous materials analysis using FDTD is presented and validated. A set of simulations covering various packing densities of a real fibrous material is performed. Loudspeaker cabinets, virtual acoustics and room acoustics are situations in which this method can be applied.

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Berdnyk, Serhii, Andrey Gomozov, Dmitriy Gretskih, Viktor Kartich e Mikhail Nesterenko. "Approximate boundary conditions for electromagnetic fields in electrodmagnetics". RADIOELECTRONIC AND COMPUTER SYSTEMS, n. 3 (4 ottobre 2022): 141–60. http://dx.doi.org/10.32620/reks.2022.3.11.

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The results of an analytical review of literature sources on the use of approximate boundary conditions for electromagnetic fields of impedance type in solving boundary value problems of electromagnetism for more than 80 recent years are presented. During this period, the impedance approach was generalized to various electrodynamic problems, in which its use made it possible to significantly expand the limits of mathematical modeling, which adequately considers the physical properties of real boundary surfaces. More than eighty years have passed since the publication of approximate boundary conditions for electromagnetic fields. The meaning and value of these conditions lies in the fact that they allow solving diffraction problems about fields outside well-conducting bodies without considering the fields inside them, which greatly simplifies the solution. Since then, numerous publications have been devoted to the application of impedance boundary conditions, the main of which (according to the authors) are presented in this paper. Particular attention is paid to the characteristics of electrically thin impedance vibrators and film-type surface structures as a personal contribution of the authors to the theory of impedance boundary conditions in electromagnetism. The subject of research in this article is the analysis of the limits and conditions for the correct application of impedance boundary conditions. The goal is to systematize the results of using the concept of approximate impedance boundary conditions for electromagnetic fields in problems of electrodynamics based on an analytical review of literature sources. The following results were obtained. The types of metal-dielectric structures are presented, for which methods of theoretical determination of the values of surface impedances for film-type structures are currently known, which are the most promising for creating technological control elements on their basis in centimeter and millimeter wavelength devices. Conclusions. The materials of this paper do not pretend to be a complete reference book covering all the results and aspects of the development of the concept of approximate impedance type boundary conditions in problems of electromagnetism over the past decades. Simultaneously, the authors hope that the information presented in this paper will be useful to specialists in the field of theoretical and applied electrodynamics, as well as graduate students, young scientists and students who are just mastering radiophysics and radio engineering specialties.

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20

Wang, Jun, Jing Lou, Jia Fu Wang, Shao Bo Qu, Hong Liang Du e Tie Jun Cui. "Ferroelectric composite artificially-structured functional material: multifield control for tunable functional devices". Journal of Physics D: Applied Physics 55, n. 30 (4 aprile 2022): 303002. http://dx.doi.org/10.1088/1361-6463/ac5e8b.

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Abstract Artificially-structured functional materials (AFMs) are artificial media that combine the advantages of nature materials and artificial structures to produce excellent and unexpected properties. Ferroelectric materials have key features in possessing spontaneous polarizations, which can be switched by using electric field, temperature, and strain. This review article attempts to provide a comprehensive insight into the current development of ferroelectric composite AFMs, and to introduce a developing subject in realizing multifield controls for tunable functional devices. Some typical ferroelectric materials and their multifield tunable mechanisms are summarized in detail. The incorporation of ferroelectric materials can yield various designs of AFMs to modulate electromagnetic waves. Recent progress of typical designs with different tuning strategies for active AFMs are illustrated and compared, including the metamaterials, metasurfaces, heterojunctions, superlattices, and their hybrid designs. This scientific subject involves interesting research topics of electromagnetism, electronics, optoelectronics, and ferroelectrics, which is significant to bring novel functionalities via multifield controls.

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21

Peng, Chang, Li Qiu, Ke Shen Gong e Ding Jun Wang. "Research on Workpiece Deformation in Electromagnetic Forming Process with Finite Element Method". Advanced Materials Research 989-994 (luglio 2014): 2702–4. http://dx.doi.org/10.4028/www.scientific.net/amr.989-994.2702.

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Electromagnetic forming is a kind of processing technology that use lorentz force to make rapid prototyping of metal workpiece, which can significantly improve the metal forming performance,and it is expected to become an emerging technology that alternative to traditional machining to process light alloy materials. Based on the understanding the basic structure of the electromagnetic coupling on the basis of physical process of electromagnetic forming, this article adopt ANSYS sequential coupling method to simulate the electromagnetic coupling process of electromagnetic structure, and analysis of tube electromagnetic forming and plate of workpiece in the process of free bulging deformation behavior. The solenoid coil tubing have an axis of symmetry due to bulging, and it’s electromagnetism load and constraint has symmetry, so its formability is uniform in hoop direction. When the plank free bulge, the distribution of the electromagnetic force caused by the flat spiral coil is not uniform,and the artifacts accelerate fastest in the part of the radius of coil 1/2, but the center area of the workpiece’s forming height is highest.

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Chesnel, Lucas, e Patrick Ciarlet,. "Compact Imbeddings in Electromagnetism with Interfaces between Classical Materials and Metamaterials". SIAM Journal on Mathematical Analysis 43, n. 5 (gennaio 2011): 2150–69. http://dx.doi.org/10.1137/100810903.

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23

Chen, Hua, Junjiang Chen, Weijun Wang e Huan Lin. "Research on Electromagnetic Sensitivity Properties of Sodium Chloride during Microwave Heating". High Temperature Materials and Processes 39, n. 1 (17 marzo 2020): 54–62. http://dx.doi.org/10.1515/htmp-2020-0048.

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AbstractThe multimode resonant cavity is the most common cavity. The material often shows on selective heating performance during the heating process due to the effect of microwave heating having a closely relationship with the electromagnetism parameters. This paper is based on finite difference time domain method (FDTD) to establish the electromagnetic-thermal model. The electromagnetic sensitivity property parameters of sodium chloride including relative dielectric constant, loss angle tangent and water content of sodium chloride is studied during the heating and drying process. The heating rate and the electric field distribution of sodium chloride, at the different water content, were simulated with the electromagnetic characteristic parameters changing. The results show that with the electromagnetic sensitivity property parameters varying, the electric field strength, heating rate and steady-state temperature of the heating material will all have a variety in the cavity. Some measures are proposed to improve the heating efficiency and ensure the stability of the microwave heating system in the industrial application.

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Szczygłowski, Jan, Paweł Kopciuszewski, Krzysztof Chwastek, Mariusz Najgebauer e Wiesław Wilczyński. "The accuracy of loss prediction in magnetic materials". Archives of Electrical Engineering 60, n. 1 (1 marzo 2011): 59–66. http://dx.doi.org/10.2478/v10171-011-0006-7.

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The accuracy of loss prediction in magnetic materialsThe paper presents a formula useful for prediction of loss density in soft magnetic materials, which takes into account multi-scale energy dissipation. A universal phenomenologicalP(Bm, f) relationship is used for loss prediction in chosen soft magnetic materials. A bootstrap method is used to generate additional data points, what makes it possible to increase the prediction accuracy. A substantial accuracy improvement for estimated model parameters is obtained in the case, when additional data points are taken into account. The proposed description could be useful both for device designers and researchers involved in computational electromagnetism.

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Wang, Xu Ai, Run Hua Fan, Zhi Cheng Shi, Min Chen, Ke Lan Yan, Kai Sun, Qing Hou, Zi Dong Zhang e Lei Qian. "Double Negative Property in Co/YIG Prepared by Low Temperature Impregnation Process". Materials Science Forum 816 (aprile 2015): 107–12. http://dx.doi.org/10.4028/www.scientific.net/msf.816.107.

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Impregnation method was used for fabricating Co/YIG (Y3Fe5O12) composites under low temperature, and the electromagnetic properties were tuned by adjusting the content (0 wt% - 35 wt%) and microstructure of the metal in composites. The XRD and SEM were used to analyze the phase and microstructure. Electromagnetism properties including reactance, permittivity and permeability of the composites were tested using impedance analyzer (10 MHz~1 GHz). The results indicated that, the high cobalt content leads to the formation of three-dimensional cobalt networks on the pore walls of porous YIG gradually, and their electromagnetic properties have also been changed significantly with the Co content increasing. Especially, double negative properties were achieved in Co/YIG composites when the content of Co reached 35 wt% at the frequency band of 575 MHz-1 GHz. The appearance of double negative properties in cermets provides promising applications in electromagnetic stealth materials, microwave antenna, and traveling wave tubes.

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Mohamodhosen, Bilquis Bibi Safoorah, Frederic Gillon, Mounaim Tounzi e Loïc Chevallier. "Topology optimisation using nonlinear behaviour of ferromagnetic materials". COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 37, n. 6 (5 novembre 2018): 2211–23. http://dx.doi.org/10.1108/compel-12-2017-0522.

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Purpose The purpose of this paper is to propose a methodology to seek the optimal topology of electromagnetic devices using the density method while taking into account the non-linear behaviour of ferromagnetic materials. The tools and methods used are detailed and applied to a three-dimensional (3D) electromagnet for analysis and validation. Resulting topologies with and without the non-linear behaviour are investigated. Design/methodology/approach The polynomial mapping is used with the density method for material distribution in the optimisation domain. To consider the non-linear behaviour of the materials, an analytical approximation based on the Marrocco equation is used and combined with the polynomial mapping to solve the problem. Furthermore, to prevent the occurrence of intermediate materials, a weighted sum of objectives is used in the optimisation problem to eliminate these undesired materials. Findings Taking into account the non-linear materials behaviour and 3D model during topology optimisation (TO) is important, as it produces more physically feasible and coherent results. Moreover, the use of a weighted sum of objectives to eliminate intermediate materials increases the number of evaluations to reach the final solution, but it is efficient. Practical implications Considering non-linear materials behaviour yields results closer to reality, and physical feasibility of structures is more obvious in absence of intermediate materials. Originality/value This work tackles an obstacle of TO in electromagnetism which is often overlooked in literature, that is, non-linear behaviour of ferromagnetic materials by proposing a methodology.

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Boller, C., I. Altpeter, G. Dobmann, M. Rabung, J. Schreiber, K. Szielasko e R. Tschuncky. "ChemInform Abstract: Electromagnetism for Understanding of the Material Behavior of Magnetic Materials". ChemInform 42, n. 43 (29 settembre 2011): no. http://dx.doi.org/10.1002/chin.201143258.

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Mitsek, O. I., e V. M. Pushkar. "Electromagnetism of REM. Quantum Theory". METALLOFIZIKA I NOVEISHIE TEKHNOLOGII 40, n. 6 (24 ottobre 2018): 713–28. http://dx.doi.org/10.15407/mfint.40.06.0713.

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Mikki, Said. "On the Topological Structure of Nonlocal Continuum Field Theories". Foundations 2, n. 1 (31 dicembre 2021): 20–84. http://dx.doi.org/10.3390/foundations2010003.

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An alternative to conventional spacetime is proposed and rigorously formulated for nonlocal continuum field theories through the deployment of a fiber bundle-based superspace extension method. We develop, in increasing complexity, the concept of nonlocality starting from general considerations, going through spatial dispersion, and ending up with a broad formulation that unveils the link between general topology and nonlocality in generic material media. It is shown that nonlocality naturally leads to a Banach (vector) bundle structure serving as an enlarged space (superspace) inside which physical processes, such as the electromagnetic ones, take place. The added structures, essentially fibered spaces, model the topological microdomains of physics-based nonlocality and provide a fine-grained geometrical picture of field–matter interactions in nonlocal metamaterials. We utilize standard techniques in the theory of smooth manifolds to construct the Banach bundle structure by paying careful attention to the relevant physics. The electromagnetic response tensor is then reformulated as a superspace bundle homomorphism and the various tools needed to proceed from the local topology of microdomains to global domains are developed. For concreteness and simplicity, our presentations of both the fundamental theory and the examples given to illustrate the mathematics all emphasize the case of electromagnetic field theory, but the superspace formalism developed here is quite general and can be easily extended to other types of nonlocal continuum field theories. An application to fundamental theory is given, which consists of utilizing the proposed superspace theory of nonlocal metamaterials in order to explain why nonlocal electromagnetic materials often require additional boundary conditions or extra input from microscopic theory relative to local electromagnetism, where in the latter case such extra input is not needed. Real-life case studies quantitatively illustrating the microdomain structure in nonlocal semiconductors are provided. Moreover, in a series of connected appendices, we outline a new broad view of the emerging field of nonlocal electromagnetism in material domains, which, together with the main superspace formalism introduced in the main text, may be considered a new unified general introduction to the physics and methods of nonlocal metamaterials.

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Qin, Faxiang, Mengyue Peng, Diana Estevez e Christian Brosseau. "Electromagnetic composites: From effective medium theories to metamaterials". Journal of Applied Physics 132, n. 10 (14 settembre 2022): 101101. http://dx.doi.org/10.1063/5.0099072.

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Electromagnetic (EM) composites have stimulated tremendous fundamental and practical interests owing to their flexible electromagnetic properties and extensive potential engineering applications. Hence, it is necessary to systematically understand the physical mechanisms and design principles controlling EM composites. In this Tutorial, we first provide an overview of the basic theory of electromagnetism about electromagnetic constitutive parameters that can represent the electromagnetic properties of materials. We show how this corpus allows a consistent construction of effective medium theories and allows for numerical simulation of EM composites to deal with structure–property relationships. We then discuss the influence of spatial dispersion of shaped inclusions in the material medium on the EM properties of composites, which has not been systematically illustrated in the context of this interdisciplinary topic. Next, artificial composites or metamaterials with peculiar properties not readily available in nature are highlighted with particular emphasis on the control of the EM interaction with composites. We conclude by discussing appropriate methods of electromagnetic measurement and practical aspects for implementing composites for specific applications are described. Overall, this Tutorial will serve the purpose of introducing the basics and applications of electromagnetic composites to newcomers in this field. It is also anticipated that researchers from different backgrounds including materials science, optics, and electrical engineering can communicate to each other with the same language when dealing with this interdisciplinary subject and further push forward this advancement from fundamental science to technological applications.

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Wan, Qiu Ming. "Research Progress in Physical Properties and Structural Design of Metamaterials". Materials Science Forum 1027 (aprile 2021): 22–32. http://dx.doi.org/10.4028/www.scientific.net/msf.1027.22.

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The metamaterial is a composite material with reasonable design. Its effective material parameters exceed the effective parameters of component materials, which shows unique properties. The concept of metamaterials has been put forward since 1960s. Nowadays, it almost involves all possible aspects of solids, from the fields of electromagnetism and optics, and mechanics and acoustics to thermology, information and other fields, and there are many research results reported, such as linear and nonlinear, reciprocal and non-reciprocal, steady and unsteady state, active and passive and so on. In this review, we start from the basics, mainly discussing the basic scope and performance characteristics of the metamaterials in optics, electromagnetism, acoustics, thermology and other emerging fields, summarizing the development process and the latest progress of theoretical design as well as experimental practices, making expectations and prospects for the future targets.

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Chen, Ming Baio, Xiao Min Wang, Ri Ping Liu, Qing Xiang Yang, Wen Chang Liu, You Sheng Tao, Jun Yan, Xiao Yi Ma, Jian Li e Pan Pan Zhai. "Methods and Equipment of Vacuum and Electromagnetism Suspending Distillation for Fine of Non-Ferrous Metals". Advanced Materials Research 295-297 (luglio 2011): 1150–55. http://dx.doi.org/10.4028/www.scientific.net/amr.295-297.1150.

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A kind of invention by make the technology excellence band together of vacuum distillation refines and Vacuum and electromagnetism refine. A kind of methods and equipment for fine of Non-ferrous metals, the unusual is: use the electromagnetism force and mix round effect of electro-magnetic induction for heat up and mix round and element distill process under electro-magnetism suspend state of Non-ferrous materials. A kind of equipment and equipment for fine of non-ferrous metals consist of vacuum furnace body, electro-magnetism loop, crucible, condenser and materials vacuum resent device, etc.; The main character is: the electro-magnetism loop is electro-magnetism conductor suspend loop which located the outside or inside the body of the furnace with a tier of insulation and magnetism transmit material. The aim of which is to develop the pureness of the product by electro-magnetism suspend vacuum distillation or deoxidize distillation and efficiency of smelting; reduce the cost of the smelting.

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33

Auchmann, B., e S. Kurz. "The pairing matrix in discrete electromagnetism". European Physical Journal Applied Physics 39, n. 2 (28 giugno 2007): 133–41. http://dx.doi.org/10.1051/epjap:2007074.

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34

Xie, Y. J., e C. H. Liang. "The generalized functional in electromagnetism". Microwave and Optical Technology Letters 17, n. 4 (marzo 1998): 255–59. http://dx.doi.org/10.1002/(sici)1098-2760(199803)17:4<255::aid-mop11>3.0.co;2-4.

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35

Johnson-Groh, Mara. "Graph neural networks solve Maxwell’s equations numerically". Scilight 2023, n. 11 (17 marzo 2023): 111103. http://dx.doi.org/10.1063/10.0017619.

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36

Post, Evert Jan. "Some Rare Peripheral Implications of Electromagnetism". Electromagnetics 25, n. 5 (luglio 2005): 483–90. http://dx.doi.org/10.1080/02726340590957452.

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37

Birss, R. R. "Integral expressions for incremental work in electromagnetism". Journal of Physics: Condensed Matter 1, n. 31 (7 agosto 1989): 5309–12. http://dx.doi.org/10.1088/0953-8984/1/31/032.

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38

Pfeifer, Robert N. C., Timo A. Nieminen, Norman R. Heckenberg e Halina Rubinsztein-Dunlop. "Optical tweezers and paradoxes in electromagnetism". Journal of Optics 13, n. 4 (4 marzo 2011): 044017. http://dx.doi.org/10.1088/2040-8978/13/4/044017.

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39

Shen, Xuhui. "The Experimental Satellite on Electromagnetism Monitoring". Chinese Journal of Space Science 34, n. 5 (2014): 558. http://dx.doi.org/10.11728/cjss2014.05.558.

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40

Schatten, Kenneth H. "Self field electromagnetism and quantum phenomena". Radiation Effects and Defects in Solids ll, n. 1 (luglio 1994): 233–73. http://dx.doi.org/10.1080/10420159108220507.

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41

Sanogo, Satafa, e Frédéric Messine. "Topology optimization in electromagnetism using SIMP method". COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 37, n. 6 (5 novembre 2018): 2138–57. http://dx.doi.org/10.1108/compel-04-2017-0170.

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PurposeIn this work, the authors deal with topology optimization in electromagnetism using solid isotropic material with penalization (SIMP) method associated with a gradient-based algorithm. The purpose of this study is to propose and investigate the impact of new generalized material interpolation scheme (MIS) used in SIMP approaches.Design/methodology/approachThe variable domains of this kind of electromagnetism design problem are decomposed into small squares which represent a material point (iron here) or void. A least square function where the magnetic ﬁeld in a target zone has to be as close as possible to a ﬁxed one is minimized. Then the binary optimization problem is relaxed to a continuous one. By using the adjoint variable method, the gradient is provided. By penalizing the objective function using MIS, gradient-based algorithms can then be directly applied to provide eﬃcient solutions close to the binary ones.FindingsIn this work, new general MISs are proposed. It is shown on numerous numerical instances that the so-obtained design solutions are more precise to define the zones with or without materials.Research limitations/implicationsOnly the linearity of the materials is addressed because the associated adjoint method needs this assumption. However, the new penalization approaches are not dependent directly on this assumption.Originality/valueThe new MISs are efficiently applied to design of a hall effect thruster (HET) magnetic circuits. Furthermore, these schemes are generic and can then be applied to other topology optimization applications in electromagnetism as well as and in mechanism.

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42

Tarhasaari, T., e L. Kettunen. "Topological Approach To Computational Electromagnetism - Abstract". Journal of Electromagnetic Waves and Applications 15, n. 2 (gennaio 2001): 203–4. http://dx.doi.org/10.1163/156939301x01354.

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43

Igarashi, Hajime, e Kota Watanabe. "Deflation Techniques for Computational Electromagnetism: Theoretical Considerations". IEEE Transactions on Magnetics 47, n. 5 (maggio 2011): 1438–41. http://dx.doi.org/10.1109/tmag.2010.2094998.

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44

Srivastava, Ankit. "Causality and passivity: From electromagnetism and network theory to metamaterials". Mechanics of Materials 154 (marzo 2021): 103710. http://dx.doi.org/10.1016/j.mechmat.2020.103710.

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45

Qu, Bo, Xin Li, Xing-yao Xiang, Shao-wei Wu, Kai Li, Xin Li e Zhi-cong Zheng. "Simulation Analysis of Electromagnetic-Fluid-Temperature Field in Cable Shafts of High-Rise Buildings". Mathematical Problems in Engineering 2023 (8 maggio 2023): 1–11. http://dx.doi.org/10.1155/2023/7825964.

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High-rise building fires can be characterized by a rapid spreading and are challenging to extinguish. The chimney effect of cable shafts in high-rise buildings will greatly increase the spread speed of fire and smoke, and will also make it harder to put out fires. Therefore, fire-blocking materials or fire protection measures are usually used in cable shafts to slow down or even block the spread of fire. Currently, most of the research focuses on the fire performance of fire protection materials, and there are relatively few studies on the impact of fire-blocking materials on the operation state of cables. Based on the theories of electromagnetism, fluid mechanics, and thermodynamics, the paper establishes a multiphysics simulation model of a double-layer cable shaft. Then, the electromagnetic-fluid-temperature distribution in the cable shaft under rated operating conditions is analyzed, and the influence of the fire-blocking material is discussed. The simulation results show that the firestop material will affect the heat dissipation of the cable, which causes the hot-spot temperature of the cable to slightly increase by 1 to 2°C, and the relative growth rate of its hot-spot temperature rise is close to 6.83%.

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46

HAN, Jung Hoon. "Electromagnetism without Electrons: A Brief History of Thermal Hall Effect". Physics and High Technology 29, n. 6 (30 giugno 2020): 14–20. http://dx.doi.org/10.3938/phit.29.020.

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The past decade has witnessed the rise of the thermal Hall measurement as a sensitive probe of transport properties in solids. Experiments performed on a wide range of materials, such as magnetic insulators, spin ice, kagome spin liquids with both ferromagnetic and antiferromagnetic exchange interactions, a quantum paraelectric, and even high-Tc cuprates, showed the existence of thermal Hall transport phenomena caused by neutral excitations. There is little doubt that an era of electromagnetism without electrons has dawned. This review covers a brief and somewhat personal account of the theory and the experimental developments of the thermal Hall effect as a new discipline of condensed matter physics over the past decade.

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47

Alouges, Francois, Matthieu Aussal e Emile Parolin. "FEM-BEM Coupling for Electromagnetism with the Sparse Cardinal Sine Decomposition",. ESAIM: Proceedings and Surveys 63 (2018): 44–59. http://dx.doi.org/10.1051/proc/201863044.

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This paper presents a FEM-BEM coupling method suitable for the numerical simulation of the electromagnetic scattering of objects composed of dielectric materials and perfect electric conduc- tors. The originality of the approach lies in part in the use of the newly proposed Sparse Cardinal Sine Decomposition SCSD) method for the BEM part of the computation and the fact that the simulation software is almost entirely written in MATLAB. The performance of the method is illustrated by the computation of the electromagnetic scattering by an UAV-like object with two RAM regions proposed in the workshop ISAE EM 2016.

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48

Symalla, Sven, e Mario Liu. "Boundary conditions of the hydrodynamic theory of electromagnetism". Physica B: Condensed Matter 255, n. 1-4 (dicembre 1998): 132–44. http://dx.doi.org/10.1016/s0921-4526(98)00460-8.

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49

Verma, Abhishek, e Jagdeep Singh Gahir. "A Study on Electro-Magnetic Properties of Concrete by Using Steel Fiber and Graphite". IOP Conference Series: Earth and Environmental Science 889, n. 1 (1 novembre 2021): 012073. http://dx.doi.org/10.1088/1755-1315/889/1/012073.

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Abstract This research paper describes the properties of electromagnetism of concrete mix that are sustained to make “Electrically Conductive Concrete”. Thus, the values provide various information on the behaviour of concrete mix and its relation with electromagnetic waves. Steel Fiber and Graphite are conductive materials. The properties of conductive concrete mix that is coarse aggregates, sand and cement can be measured. In the physical significance, the data calculated in X-ray diffraction and Scanning Electronic Microscope was discussed. The contact between the Steel Fiber and graphite is improved to make electrically conductive concrete. The strength is gained continuously till 3% where the maximum strength is gained which is 9.77% higher than the strength achieved by controlled sample. The control sample achieved 26.60MPa, with addition of 1% steel fibers the concrete achieved 29.40MPa, further increase in steel fiber content to 2% gained higher strength of 30.50MPa. The maximum compressive strength of 31.50MPa was achieved with the addition of 3% steel fibers. Further increase in steel fiber content resulted in decrease in strength, though 4% steel fiber reinforced concrete achieved 30.70MPa

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50

Clemens, M., e T. Weiland. "Discrete Electromagnetism With the Finite Integration Technique - Abstract". Journal of Electromagnetic Waves and Applications 15, n. 1 (gennaio 2001): 79–80. http://dx.doi.org/10.1163/156939301x00661.

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