Electromagnetic properties of three-dimensional wire arrays: photons, plasmons, and equivalent circuits

2003 ◽  
Author(s):  
Gennady Shvets ◽  
Andrey K. Sarychev ◽  
Vladimir M. Shalaev
Keyword(s):  
Three Dimensional ◽  
Electromagnetic Properties ◽  
Equivalent Circuits ◽  
Wire Arrays

scholarly journals A Review on Additive Manufacturing Possibilities for Electrical Machines

Energies ◽  
2021 ◽  
Vol 14 (7) ◽  
pp. 1940
Author(s):  
Muhammad Usman Naseer ◽  
Ants Kallaste ◽  
Bilal Asad ◽  
Toomas Vaimann ◽  
Anton Rassõlkin
Keyword(s):  
Additive Manufacturing ◽  
Large Scale ◽  
Three Dimensional ◽  
Electrical Machines ◽  
Electromagnetic Properties ◽  
Scale Production ◽  
Performance Parameters ◽  
Large Scale Production ◽  
One Step ◽  
Manufacturing Techniques

This paper presents current research trends and prospects of utilizing additive manufacturing (AM) techniques to manufacture electrical machines. Modern-day machine applications require extraordinary performance parameters such as high power-density, integrated functionalities, improved thermal, mechanical & electromagnetic properties. AM offers a higher degree of design flexibility to achieve these performance parameters, which is impossible to realize through conventional manufacturing techniques. AM has a lot to offer in every aspect of machine fabrication, such that from size/weight reduction to the realization of complex geometric designs. However, some practical limitations of existing AM techniques restrict their utilization in large scale production industry. The introduction of three-dimensional asymmetry in machine design is an aspect that can be exploited most with the prevalent level of research in AM. In order to take one step further towards the enablement of large-scale production of AM-built electrical machines, this paper also discusses some machine types which can best utilize existing developments in the field of AM.

scholarly journals Electromagnetic Properties of Disordered Three-Dimensional Mixtures

IEEE Access ◽  
2013 ◽  
Vol 1 ◽  
pp. 778-788 ◽  
Author(s):  
Austin J. Pickles ◽  
Ian M. Kilgore ◽  
Michael B. Steer
Keyword(s):  
Three Dimensional ◽  
Electromagnetic Properties

Three-dimensional heterostructured ZnSe nanoparticles/Si wire arrays with enhanced photodetection and photocatalytic performances

2013 ◽  
Vol 1 (7) ◽  
pp. 1345-1351 ◽  
Author(s):  
Yi-Hsin Chen ◽  
Wun-Shan Li ◽  
Chun-Yi Liu ◽  
Chiu-Yen Wang ◽  
Yu-Cheng Chang ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Znse Nanoparticles ◽  
Wire Arrays ◽  
Photocatalytic Performances

Theory to Help the Use of Electromagnetic Flow Meters

2002 ◽  
Author(s):  
Xiao-Zhang Zhang
Keyword(s):  
Pipe Wall ◽  
Three Dimensional ◽  
Electromagnetic Properties ◽  
Reasonable Accuracy ◽  
Flow Meter ◽  
Flow Meters ◽  
Electromagnetic Flow ◽  
Gas Liquid Flow ◽  
Electromagnetic Flow Meter ◽  
Theory Research

Compared with other flow meters, the theory of electromagnetic flow meter is well developed. Until now, we are able to predict the three dimensional characteristics of this kind of flow meters with reasonable accuracy. This has given much help to the designers to improve the flow meters. On the other hand, the theory can offer a tool for the users of this kind of flow meters to judge the application situations, estimate the possible measurement error, etc. This paper introduces the recent work of the author on the theory of the electromagnetic flow meter. The basic physical conceptions and equations are given with a brief history review of the theory research. Several examples are given of using the theory to analyze the meters’ behavior in different application situations. They are: effect of the conducting pipe connections; errors caused by a pipe wall of different electromagnetic properties; gas-liquid flow and errors caused by a relative motion of the probe.

Equivalent Circuits of the Elastic Field

1944 ◽  
Vol 11 (3) ◽  
pp. A149-A161
Author(s):  
Gabriel Kron
Keyword(s):  
Steady State ◽  
Reference Frames ◽  
Three Dimensional ◽  
Elastic Field ◽  
Companion Paper ◽  
Theory Of Elasticity ◽  
Equivalent Circuits ◽  
Two Dimensional ◽  
Arbitrary Boundary ◽  
Nonlinear Stress

Abstract This paper presents equivalent circuits representing the partial differential equations of the theory of elasticity for bodies of arbitrary shapes. Transient, steady-state, or sinusoidally oscillating elastic-field phenomena may now be studied, within any desired degree of accuracy, either by a “network analyzer,” or by numerical- and analytical-circuit methods. Such problems are the propagation of elastic waves, determination of the natural frequencies of vibration of elastic bodies, or of stresses and strains in steady-stressed states. The elastic body may be non-homogeneous, may have arbitrary shape and arbitrary boundary conditions, it may rotate at a uniform angular velocity and may, for representation, be divided into blocks of uneven length in different directions. The circuits are developed to handle both two- and three-dimensional phenomena. They are expressed in all types of orthogonal curvilinear reference frames in order to simplify the boundary relations and to allow the solution of three-dimensional problems with axial and other symmetry by the use of only a two-dimensional network. Detailed circuits are given for the important cases of axial symmetry, cylindrical co-ordinates (two-dimensional) and rectangular co-ordinates (two- and three-dimensional). Nonlinear stress-strain relations in the plastic range may be handled by a step-by-step variation of the circuit constants. Nonisotropic bodies and nonorthogonal reference frames, however, require an extension of the circuits given. The circuits for steady-state stress and small oscillation phenomena require only inductances and capacitors, while the circuits for transients require also standard (not ideal) transformers. A companion paper deals in detail with numerical and experimental methods to solve the equivalent circuits.

Electromagnetic properties of photonic crystals with diamond structure containing defects

2003 ◽  
Vol 18 (9) ◽  
pp. 2214-2220 ◽  
Author(s):  
Shingo Kanehira ◽  
Soshu Kirihara ◽  
Yoshinari Miyamoto ◽  
Kazuaki Sakoda ◽  
Mitsuo Wada Takeda
Keyword(s):  
Photonic Crystals ◽  
Band Gap ◽  
Photonic Band Gap ◽  
Three Dimensional ◽  
Expansion Method ◽  
Electromagnetic Properties ◽  
Diamond Structure ◽  
Multiple Reflections ◽  
Air Cavity ◽  
Photonic Band

Three-dimensional photonic crystals with a diamond structure, which are composed of the TiO2-based ceramic particles dispersed in an epoxy lattice, were fabricated by stereolithography. The diamond structure showed a photonic band gap in the 14.3–17.0 GHz range along the Γ-K 〈110〉 direction, which is close to the band calculation using the plain wave expansion method. Two types of lattice defects—air cavity and dielectric cavity—were introduced into the diamond structure by removing a unit cell of diamond structure or inserting a block of the lattice medium into the air cavity. The transmission of millimeter waves affected by multiple reflections at the defects was measured in the photonic band gap. Resonant frequencies in the defects were calculated and compared with the measurement results.

scholarly journals Numerical study of jets produced by conical wire arrays on the Magpie pulsed power generator

2010 ◽  
Vol 6 (S274) ◽  
pp. 429-432
Author(s):  
Matteo Bocchi ◽  
Jerry P. Chittenden ◽  
Andrea Ciardi ◽  
Francisco Suzuki-Vidal ◽  
Gareth N. Hall ◽  
...  
Keyword(s):  
Magnetic Fields ◽  
Numerical Simulations ◽  
Numerical Study ◽  
Three Dimensional ◽  
Pulsed Power ◽  
Astrophysical Jets ◽  
Power Generator ◽  
Wire Arrays ◽  
Pulsed Power Generator

AbstractWith the aim to model jets produced by conical wire arrays on the MAGPIE generator, and to strengthen the link between laboratory and astrophysical jets, we performed three-dimensional magneto-hydro-dynamic numerical simulations using the code GORGON and successfully reproduced the experiments. We found that a minimum resolution of ~100 μm is required to retrieve the unstable character of the jet. Moreover, arrays with less wires produce more unstable jets with stronger magnetic fields around them.

Digital description model of a three-dimensional arrangement structure of conductive fiber of electromagnetic shielding fabric

2017 ◽  
Vol 29 (1) ◽  
pp. 14-24 ◽  
Author(s):  
Xiuchen Wang ◽  
Yaping Li ◽  
Ying Su ◽  
Zhen Pan ◽  
Zhe Liu
Keyword(s):  
Feature Extraction ◽  
Complex Structure ◽  
Three Dimensional ◽  
Electromagnetic Shielding ◽  
Electromagnetic Properties ◽  
Shielding Effectiveness ◽  
Content Type ◽  
Conductive Fiber ◽  
Feature Parameters ◽  
Conductive Fibers

Purpose The three-dimensional arrangement structure of the conductive fiber is an important factor of the shielding effectiveness of the electromagnetic shielding fabric (EMSF). However, until now, the three-dimensional arrangement structure has not been described because of the complex structure, which leads to many difficulties for the subsequent analysis of the electromagnetic characteristics. Therefore, the purpose of this paper is to propose a feature extraction method to describe the arrangement structure of the conductive fiber based on the three-dimensional calibration and image processing technology, providing a new idea for the above problem. Design/methodology/approach First, the three-dimensional positions of the conductive fibers in the EMSF are calibrated using the VHX-600 3D digital microscope and the MATLAB7.5 software. The arrangement characteristics of the conductive fibers are analyzed, and equivalent twist, cross-sectional content, and average angle of a single fiber are proposed to describe the arrangement characteristic of the conductive fiber. Then, a digital description model of the conductive fiber is constructed according to the feature parameters and its three-dimensional structures are reproduced using CATIA. Finally, the reliability of the model is verified by an FDTD example, and the significance and application of the model are given. Findings The proposed method can provide the feature extraction and description for the complex spatial three-dimensional arrangement structure of conductive fibers. The feature parameters can reflect different micro arrangement features of the conductive fiber. The proposed idea and method can provide a solid foundation for subsequent studies of the electromagnetic properties of the EMSF. Originality/value The study in this paper is of great significance and academic value. This paper provides a new three-dimensional calibration method and constructs multiple feature parameters to describe the complex three-dimensional arrangement structure, providing a new effective method to overcome the problem of the conductive fiber description. The proposed method provides an important basis for the shielding mechanism, transmission characteristics, electromagnetic calculation and product design, and woven technology of the EMSF.

Double Negative Property in Co/YIG Prepared by Low Temperature Impregnation Process

2015 ◽  
Vol 816 ◽  
pp. 107-112 ◽  
Author(s):  
Xu Ai Wang ◽  
Run Hua Fan ◽  
Zhi Cheng Shi ◽  
Min Chen ◽  
Ke Lan Yan ◽  
...  
Keyword(s):  
Low Temperature ◽  
Three Dimensional ◽  
Cobalt Content ◽  
Electromagnetic Properties ◽  
Microwave Antenna ◽  
Impregnation Method ◽  
Double Negative ◽  
Impedance Analyzer ◽  
Traveling Wave Tubes ◽  
Stealth Materials

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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