Fast frequency sweep of metallic antennas using frequency-independent reaction and enhanced gap source model

2017 ◽  
Vol 31 (11-12) ◽  
pp. 1093-1100 ◽  
Author(s):  
Ping Du ◽  
Yu Shao ◽  
Cheng Wang
Keyword(s):  
Source Model ◽  
Frequency Sweep ◽  
Frequency Independent ◽  
Independent Reaction

The Rubber Elasticity of Poly(N-isopropylacrylamide) Hydrogel Networks

2013 ◽  
Vol 812 ◽  
pp. 210-215
Author(s):  
Nadia Adrus ◽  
Mathias Ulbricht
Keyword(s):  
Mesh Size ◽  
Rubber Elasticity ◽  
Frequency Sweep ◽  
Rheological Measurements ◽  
Rheological Data ◽  
Frequency Independent ◽  
Typical Range ◽  
Good Agreement

We report here on the characterization of classical bulk poly (N-isopropylacrylamide) (PNIPAAm) hydrogel networks. The classical PNIPAAm hydrogels were prepared from N-isopropylacrylamide (NIPAAm) as a main monomer and N,N-methylenebisacrylamide (MBAAm) as a crosslinker. The viscoelastic character of bulk hydrogels was examined using rheological measurements under frequency sweep mode (20 °C). A range of frequency, ω from 0.1 to 100 rad/s, was employed as this is a typical range for rubber plateau. Within this range, almost frequency independent of storage moduli (G'; ~ 104 Pa as a function of hydrogel compositions were obtained. Indeed, the perfect soft-rubbery behaviour of PNIPAAm hydrogels could be confirmed and thus enabled the estimation of mesh size. Interestingly, the mesh size rubbery hydrogels determined from rheological data was in a good agreement to that from swelling experiments (~ 4 to 9 nm).

Frequency-independent smart interference suppression for multi-standard transceivers

2012 ◽  
Author(s):  
Erwin J.G. Janssen ◽  
Dusan Milosevic ◽  
Peter G.M. Baltus ◽  
Arthur H.M. van Roermund ◽  
Hooman Habibi
Keyword(s):  
Interference Suppression ◽  
Frequency Independent

Frequency sweep implementation of adaptive multi-level substructuring

1997 ◽  
Author(s):  
Jeffrey Bennighof ◽  
Matthew Kaplan ◽  
Jeffrey Bennighof ◽  
Matthew Kaplan
Keyword(s):  
Frequency Sweep ◽  
Multi Level
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