scholarly journals Paper-based flexible metamaterial for microwave applications

2021 ◽  
Vol 8 ◽  
pp. 6
Author(s):  
Zidong Zhang ◽  
Yaman Zhao ◽  
Guohua Fan ◽  
Wenjin Zhang ◽  
Yao Liu ◽  
...  
Keyword(s):  
Negative Refraction ◽  
Electromagnetic Properties ◽  
Paper Substrate ◽  
Future Directions ◽  
Microwave Application ◽  
Electromagnetic Devices ◽  
Research Fields ◽  
Invisible Cloak ◽  
Application Fields ◽  
Design Freedom

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.

scholarly journals Machine Learning for Design Optimization of Electromagnetic Devices: Recent Developments and Future Directions

2021 ◽  
Vol 11 (4) ◽  
pp. 1627
Author(s):  
Yanbin Li ◽  
Gang Lei ◽  
Gerd Bramerdorfer ◽  
Sheng Peng ◽  
Xiaodong Sun ◽  
...  
Keyword(s):  
Machine Learning ◽  
Design Optimization ◽  
Optimization Methods ◽  
Machine Learning Algorithms ◽  
Cloud Services ◽  
Robust Design Optimization ◽  
Support Vector ◽  
Future Directions ◽  
Electromagnetic Devices ◽  
Recent Developments

This paper reviews the recent developments of design optimization methods for electromagnetic devices, with a focus on machine learning methods. First, the recent advances in multi-objective, multidisciplinary, multilevel, topology, fuzzy, and robust design optimization of electromagnetic devices are overviewed. Second, a review is presented to the performance prediction and design optimization of electromagnetic devices based on the machine learning algorithms, including artificial neural network, support vector machine, extreme learning machine, random forest, and deep learning. Last, to meet modern requirements of high manufacturing/production quality and lifetime reliability, several promising topics, including the application of cloud services and digital twin, are discussed as future directions for design optimization of electromagnetic devices.

NONRECIPROCAL ELECTROMAGNETIC DEVICES IN GYROMAGNETIC PHOTONIC CRYSTALS

2013 ◽  
Vol 28 (02) ◽  
pp. 1441010 ◽  
Author(s):  
ZHI-YUAN LI ◽  
RONG-JUAN LIU ◽  
LIN GAN ◽  
JIN-XIN FU ◽  
JIN LIAN
Keyword(s):  
Magnetic Field ◽  
Band Gap ◽  
Electromagnetic Waves ◽  
Experimental Studies ◽  
Magnetic Surface ◽  
Electromagnetic Properties ◽  
Edge States ◽  
Bragg Scattering ◽  
Electromagnetic Devices ◽  
Gap Opening

Gyromagnetic photonic crystal (GPC) offers a promising way to realize robust transport of electromagnetic waves against backscattering from various disorders, perturbations and obstacles due to existence of unique topological electromagnetic states. The dc magnetic field exerting upon the GPC brings about the time-reversal symmetry breaking, splits the band degeneracy and opens band gaps where the topological chiral edge states (CESs) arise. The band gap can originate either from long-range Bragg-scattering effect or from short-range localized magnetic surface plasmon resonance (MSP). These topological edge states can be explored to construct backscattering-immune one-way waveguide and other nonreciprocal electromagnetic devices. In this paper we review our recent theoretical and experimental studies of the unique electromagnetic properties of nonreciprocal devices built in GPCs. We will discuss various basic issues like experimental instrumental setup, sample preparations, numerical simulation methods, tunable properties against magnetic field, band degeneracy breaking and band gap opening and creation of topological CESs. We will investigate the unidirectional transport properties of one-way waveguide under the influence of waveguide geometries, interface morphologies, intruding obstacles, impedance mismatch, lattice disorders, and material dissipation loss. We will discuss the unique coupling properties between one-wave waveguide and resonant cavities and their application as novel one-way bandstop filter and one-way channel-drop filter. We will also compare the CESs created in the Bragg-scattering band gap and the MSP band gap under the influence of lattice disorders. These results can be helpful for designing and exploring novel nonreciprocal electromagnetic devices for optical integration and information processing.

scholarly journals Preparation and Conductive and Electromagnetic Properties of Fe3O4/PANI Nanocomposite via Reverse In Situ Polymerization

2019 ◽  
Vol 2019 ◽  
pp. 1-9
Author(s):  
Di Zhang ◽  
Huaiyin Chen ◽  
Ruoyu Hong
Keyword(s):  
In Situ Polymerization ◽  
Rapid Development ◽  
Chloroform Solution ◽  
Electromagnetic Properties ◽  
Network Analyzer ◽  
The Novel ◽  
Electromagnetic Devices ◽  
Ft Ir ◽  
Polymerization Method

In this paper, the magnetite/polyaniline (PANI) nanocomposite was prepared by the novel reverse in situ polymerization method. Fe3O4 magnetic nanoparticles were synthesized in situ in PANI chloroform solution to form a suspension containing the Fe3O4/PANI nanocomposite. It overcame the disadvantage of oxidation of the Fe3O4 by the oxidant in conventional method. The Fe3O4/PANI chloroform suspension and the Fe3O4/PANI powder were characterized by FT-IR, TEM, XRD, vibrating sample magnetometer, Gouy magnetic balance, conductivity meter, and vector network analyzer. It is demonstrated that the Fe3O4/PANI suspension has a good electrical conductivity that is up to 2.135 μS/cm at the optimal ratio of reactants. The Fe3O4 nanoparticles are well dispersed in the PANI network with a particle size of about 10 nm. Fe3O4/PANI powder has high saturation magnetization and magnetic susceptibility, as well as a broad application prospect in the field of electromagnetic devices. The Fe3O4/PANI powder exhibits an excellent microwave absorption behavior, which can be an outstanding candidate for the rapid development of broadband shielding materials.

scholarly journals Review of Passive Electromagnetic Devices for Vibration Damping and Isolation

2019 ◽  
Vol 2019 ◽  
pp. 1-16 ◽  
Author(s):  
Efren Diez-Jimenez ◽  
Rocco Rizzo ◽  
Maria-Jesus Gómez-García ◽  
Eduardo Corral-Abad
Keyword(s):  
Lower Cost ◽  
Mechanical Vibration ◽  
Vibration Damping ◽  
Technology Readiness ◽  
Damping Capacity ◽  
Electromagnetic Devices ◽  
Technology Readiness Level ◽  
Recent Developments ◽  
Readiness Level ◽  
Application Fields

Passive electromagnetic devices for vibration damping and isolation are becoming a real alternative to traditional mechanical vibration and isolation methods. These types of devices present good damping capacity, lower cost, null power consumption, and higher reliability. In this work, a state-of-the-art review has been done highlighting advantages and drawbacks, application fields, and technology readiness level of most recent developments. In addition, a general introductory section relates presents key considerations that any engineer, electrical or mechanical, needs to know for a deep comprehension and correct design of these types of devices.

Innovation Management of BSUIN Underground Laboratories

2020 ◽  
Author(s):  
Rüdiger Giese ◽  
Katrin Jaksch
Keyword(s):  
Baltic Sea ◽  
Innovation Management ◽  
Research Areas ◽  
Research Fields ◽  
Research And Innovation ◽  
Research Activities ◽  
The Baltic ◽  
Application Fields ◽  
Innovation Platform ◽  
Areas Of Interest

<p>The Baltic Sea Underground Innovation Network BSUIN is a European research project funded by Interreg Baltic Sea Region. The BSUIN network consists of six underground laboratories in Finland, Sweden, Russia, Poland and Germany with associated business and research partners. Each of the underground laboratories is unique in its geology, underground space and use. The BSUIN aims to build up a platform for innovative research and business concepts for the use of underground infrastructures and also especially for applications after completion of mining activities.</p><p>For an innovation management it is important to identify research and application fields in underground labs for the present but also research areas of interest in the future. Also it is significant to define the relevant research fields, which are more likely to result in innovations and business applications.</p><p>Within BSUIN an innovation platform concept will be established as a guideline for innovation management and support for the innovation processes. For that purpose we questioned aspects of the use of underground labs for users from several kind of customers and users from research and business of small and medium-sized enterprises.</p><p>Here we present an overview of the evaluation of the questionnaire. What are the main aspects which are important for the use of underground labs for research and innovation and especially for business activities? Within BSUIN a concept of an innovation platform concept will be integrated in the BSUIN web based tool. This will allow to apply innovation keywords to site-specific research activities in each BSUIN mine.</p>

scholarly journals Spatial transformation-enabled electromagnetic devices: from radio frequencies to optical wavelengths

2015 ◽  
Vol 373 (2049) ◽  
pp. 20140363 ◽  
Author(s):  
Zhi Hao Jiang ◽  
Jeremy P. Turpin ◽  
Kennith Morgan ◽  
Bingqian Lu ◽  
Douglas H. Werner
Keyword(s):  
Electromagnetic Waves ◽  
Transformation Optics ◽  
Electromagnetic Properties ◽  
Wave Radiation ◽  
Experimental Investigations ◽  
Electromagnetic Spectrum ◽  
Coordinate Transformations ◽  
Electromagnetic Devices ◽  
Optical Wavelengths ◽  
Radio Frequencies

Transformation optics provides scientists and engineers with a new powerful design paradigm to manipulate the flow of electromagnetic waves in a user-defined manner and with unprecedented flexibility, by controlling the spatial distribution of the electromagnetic properties of a medium. Using this approach, over the past decade, various previously undiscovered physical wave phenomena have been revealed and novel electromagnetic devices have been demonstrated throughout the electromagnetic spectrum. In this paper, we present versatile theoretical and experimental investigations on designing transformation optics-enabled devices for shaping electromagnetic wave radiation and guidance, at both radio frequencies and optical wavelengths. Different from conventional coordinate transformations, more advanced and versatile coordinate transformations are exploited here to benefit diverse applications, thereby providing expanded design flexibility, enhanced device performance, as well as reduced implementation complexity. These design examples demonstrate the comprehensive capability of transformation optics in controlling electromagnetic waves, while the associated novel devices will open up new paths towards future integrated electromagnetic component synthesis and design, from microwave to optical spectral regimes.

Two-Dimensional Oxides: Recent Progress in Nanosheets

2018 ◽  
Vol 233 (1) ◽  
pp. 117-165 ◽  
Author(s):  
Richard Hinterding ◽  
Armin Feldhoff
Keyword(s):  
Recent Progress ◽  
Three Dimensional ◽  
Two Dimensional ◽  
Research Fields ◽  
Promising Application ◽  
Optical And Mechanical Properties ◽  
Application Fields ◽  
New Research ◽  
Novel Applications

Abstract Two-dimensional (2D) materials have been widely investigated for the last few years, introducing nanosheets and ultrathin films. The often superior electrical, optical and mechanical properties in contrast to their three-dimensional (3D) bulk counterparts offer a promising field of opportunities. Especially new research fields for already existing and novel applications are opened by downsizing and improving the materials at the same time. Some of the most promising application fields are namely supercapacitors, electrochromic devices, (bio-) chemical sensors, photovoltaic devices, thermoelectrics, (photo-) catalysts and membranes. The role of oxides in this field of materials deserves a closer look due to their availability, durability and further advantages. Here, recent progress in oxidic nanosheets is highlighted and the benefit of 2D oxides for applications discussed in-depth. Therefore, different synthesis techniques and microstructures are compared more closely.

The Left-Handed Properties of the Composite Medium Composed of Ferrite Cubes’ Array and Copper Net

2010 ◽  
Vol 434-435 ◽  
pp. 343-345 ◽  
Author(s):  
Li Hui Zhang ◽  
Yang Bai ◽  
Jin Xu Li ◽  
Li Jie Qiao
Keyword(s):  
Negative Refraction ◽  
Composite Medium ◽  
Negative Permittivity ◽  
Electromagnetic Properties ◽  
Pass Band ◽  
Negative Permeability ◽  
Wave Amplification ◽  
Left Handed ◽  
Negative Role ◽  
Difference Time

Left-handed material (LHM), whose permittivity and permeability are both negative, has attracted much attention due to its exotic electromagnetic properties, such as negative refraction, backward wave propagation and evanescent wave amplification. The microwave left-handed property of a composite medium composed of ferrite cubes’ array and copper net was studied using the method of finite difference time domain in this paper. An obvious left-handed pass band emerged when ferrite cubes were combined with longitudinal copper wires, because the ferrite produced negative permeability by the ferromagnetic resonance and the copper wires produced negative permittivity by the plasma. With the addition of horizontal copper wires, the transmission intensity of the pass band was gradually weakened. It can be concluded that the horizontal wires played a negative role in realizing the composite LHM with ferrite cubes and copper net. This work gives an instructive direction to the fabrication of 3D LHMs.

scholarly journals Plenty of Room at the Bottom: Nanotechnology as Solution to an Old Issue in Enhanced Oil Recovery

2018 ◽  
Vol 8 (12) ◽  
pp. 2596 ◽  
Author(s):  
Pablo Druetta ◽  
Patrizio Raffa ◽  
Francesco Picchioni
Keyword(s):  
Enhanced Oil Recovery ◽  
Oil Recovery ◽  
Real Life ◽  
The Past ◽  
Research Fields ◽  
Scientific Disciplines ◽  
Past Half Century ◽  
Manufacturing Methods ◽  
Application Fields ◽  
Past Half

During the past half-century, the prefix “nano” attached to several words, such as “technology”, “motors”, “device”, and so on has denoted cutting-edge research fields and topics at the forefront of classical scientific disciplines. Possible application fields have been frequently evoked, even if real-life examples are still difficult to find. The present review analyzes how nanotechnology is utilized in enhanced oil recovery (EOR) processes so as to increase the efficiency of mature oilfields. Nanotechnology in EOR is classified into three categories: nanoparticles/nanofluids, nanoemulsions, and nanocatalysts. The advantages at the nanoscale are also described and discussed, including an overview of manufacturing methods as well as the concerns about their possible environmental impacts. Clearly, nanotechnology has the potential to boost EOR techniques, although there are still many questions and drawbacks to be tackled.

Sign in / Sign up

Export Citation Format

Share Document