A miniaturized high‐performance broadband absorber based on 2. 5‐D meander lines and magnetic materials at low frequencies

2021 ◽  
Author(s):  
Xuewei Zhang ◽  
Shaobin Liu ◽  
Qiming Yu ◽  
Lingling Wang ◽  
Kun Liao
Keyword(s):  
Magnetic Materials ◽  
High Performance ◽  
Low Frequencies ◽  
Broadband Absorber ◽  
Meander Lines

Technology Development for Transition Metal-Rare Earth High-Performance Magnetic Materials

1973 ◽  
Author(s):  
J. J. Becker ◽  
M. G. Benz ◽  
R. E. Cech ◽  
R. J. Charles ◽  
M. Doser
Keyword(s):  
Rare Earth ◽  
Transition Metal ◽  
Magnetic Materials ◽  
High Performance ◽  
Technology Development

Influence of Materials on the Performance Limits of Microactuators

2007 ◽  
Vol 1052 ◽  
Author(s):  
Prasanna Srinivasan ◽  
S. Mark Spearing
Keyword(s):  
Thin Films ◽  
Shape Memory ◽  
High Performance ◽  
Low Frequency ◽  
Beam Theory ◽  
Performance Limits ◽  
Low Frequencies ◽  
Thermal Actuators ◽  
Work Volume ◽  
Selection Of

AbstractThe selection of actuators at the micro-scale requires an understanding of the performance limits of different actuation mechanisms governed by the optimal selection of materials. This paper presents the results of analyses for elastic bi-material actuators based on simple beam theory and lumped parameter thermal models. Comparisons are made among commonly employed actuation schemes (electro-thermal, piezoelectric and shape memory) at micro scales and promising candidate materials are identified. Polymeric films on Si subjected to electro-thermal heating are optimal candidates for high displacement, low frequency devices while ferroelectric thin films of Pb-based ceramics on Si/ DLC are optimal for high force, high frequency devices. The ability to achieve ∼10 kHz at scales < 100μm make electro-thermal actuators competitive with piezoelectric actuators considering the low work/volume obtained in piezoelectric actuation (∼ 10−8J.m−3.mV−2). Although shape memory alloy (SMA) actuators such as Ni-Ti on Si deliver larger work (∼ 1 J.m−3K−2) than electro-thermal actuators at relatively low frequencies (∼ 1 kHz), the critical scale associated with the cessation of the shape memory effect forms the bounding limit for the actuator design. The built-in compressive stress levels (∼ 1GPa) in thin films of Si and DLC could be exploited for realizing a high performance actuator by electro-thermal buckling.

Design of a Hybrid Acoustic Device Based on Proof-Mass Actuators

2012 ◽  
Author(s):  
Francesco Braghin ◽  
Francesco Castelli-Dezza ◽  
Simone Cinquemani ◽  
Ferruccio Resta
Keyword(s):  
High Performance ◽  
Proof Mass ◽  
Supporting Surface ◽  
Low Frequencies ◽  
High Frequencies ◽  
Sound Reproduction ◽  
Different Types ◽  
Magnetostrictive Actuator ◽  
Acoustic Device

The paper deals with the design of a device for sound reproduction to be fixed to a supporting surface. The device is made up of two different types of acoustic actuators based on different technologies that allow good sound reproduction in the range of frequencies from 20Hz to 20kHz. The generation of sound at high frequencies is demanded to a magnetostrictive actuator, while a more traditional magnetodynamics actuator is used to generate sound at low frequencies. The coupling between these two actuators leads to a device having small overall dimensions and high performance.

Scalable Digital Receiver for Multi-Element Radio Telescopes

2020 ◽  
Vol 09 (04) ◽  
pp. 2050016
Author(s):  
C. R. Subrahmanya ◽  
O. S. Sarun ◽  
Yogindra Abhyankar ◽  
Sajish Chandrababu ◽  
Chinmay Bahulekar
Keyword(s):  
High Performance ◽  
High Spectral Resolution ◽  
Wide Field ◽  
Digital Receiver ◽  
Radio Telescopes ◽  
Low Frequencies ◽  
Receiver Architecture ◽  
Field Programmable ◽  
Element Array ◽  
Entire Array

Modern and upcoming radio telescopes at low frequencies are often characterized by hundreds or thousands of antenna elements operating at wide bandwidths up to about 0.5[Formula: see text]GHz. A spectral correlator for such an array is required to estimate the cross-power spectrum of the response of each element with that of every other element with a high spectral resolution. The resulting all-to-all connectivity between signals from the entire array poses a serious bottleneck. In this paper, we propose a simple digital receiver architecture that interfaces the digitized time series from a large number of antenna elements to a High-Performance Computing (HPC) cluster through a communication switch to overcome the data ingest bottleneck. Each HPC node can then perform wideband processing in steps of finite but significant time-slices for the entire array. We explain in detail the implementation of our architecture for the proposed expansion of the Ooty Wide Field Array (OWFA) into a 1056 element array. Since the proposed digital receiver is based on Field Programmable Gate Array (FPGA), it can be reconfigured for different applications. This is illustrated by considering the case of Phased Array Feeds (PAF) for the proposed expanded Giant Metrewave Radio Telescope (eGMRT).

scholarly journals High performance of low cost soft magnetic materials

2011 ◽  
Vol 34 (7) ◽  
pp. 1407-1413 ◽  
Author(s):  
Josefina M. Silveyra ◽  
Emília Illeková ◽  
Marco Coïsson ◽  
Federica Celegato ◽  
Franco Vinai ◽  
...  
Keyword(s):  
Magnetic Materials ◽  
High Performance ◽  
Low Cost ◽  
Soft Magnetic Materials ◽  
Soft Magnetic
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