Dielectric properties of strontium sodium niobate ceramics using the microwave cavity perturbation technique

2003 ◽  
Vol 39 (2) ◽  
pp. 112-115 ◽  
Author(s):  
Jaimon Yohannan ◽  
Joe Jacob ◽  
Anil Lonappan ◽  
K. T. Mathew
Keyword(s):  
Dielectric Properties ◽  
Perturbation Technique ◽  
Microwave Cavity ◽  
Sodium Niobate ◽  
Cavity Perturbation ◽  
Microwave Cavity Perturbation

Microwave cavity perturbation technique: Part I: Principles

1993 ◽  
Vol 14 (12) ◽  
pp. 2423-2457 ◽  
Author(s):  
Olivier Klein ◽  
Steve Donovan ◽  
Martin Dressel ◽  
George Grüner
Keyword(s):  
Perturbation Technique ◽  
Microwave Cavity ◽  
Cavity Perturbation ◽  
Microwave Cavity Perturbation

Microwave cavity perturbation technique: Part II: Experimental scheme

1993 ◽  
Vol 14 (12) ◽  
pp. 2459-2487 ◽  
Author(s):  
Steve Donovan ◽  
Olivier Klein ◽  
Martin Dressel ◽  
Kàroly Holczer ◽  
George Grüner
Keyword(s):  
Perturbation Technique ◽  
Microwave Cavity ◽  
Experimental Scheme ◽  
Cavity Perturbation ◽  
Microwave Cavity Perturbation

scholarly journals Rapid, non-invasive characterization of the dispersity of emulsions via microwaves

2018 ◽  
Vol 9 (34) ◽  
pp. 6975-6980 ◽  
Author(s):  
Yuqiang Yan ◽  
Sergio Gonzalez-Cortes ◽  
Benzhen Yao ◽  
Daniel R. Slocombe ◽  
Adrian Porch ◽  
...  
Keyword(s):  
Perturbation Technique ◽  
New Method ◽  
Microwave Cavity ◽  
Non Invasive ◽  
Cavity Perturbation ◽  
Microwave Cavity Perturbation

Here we report an entirely new method for the non-intrusive interrogation and characterisation of emulsions based on the microwave cavity perturbation technique.

scholarly journals Ammonia storage studies on H-ZSM-5 zeolites by microwave cavity perturbation: correlation of dielectric properties with ammonia storage

2015 ◽  
Vol 4 (2) ◽  
pp. 263-269 ◽  
Author(s):  
M. Dietrich ◽  
D. Rauch ◽  
U. Simon ◽  
A. Porch ◽  
R. Moos
Keyword(s):  
Dielectric Properties ◽  
Catalytic Reduction ◽  
Nox Reduction ◽  
Microwave Cavity ◽  
Laboratory Setup ◽  
Scr Catalysts ◽  
Ammonia Storage ◽  
Cavity Perturbation ◽  
Acidic Sites ◽  
Microwave Cavity Perturbation

Abstract. To meet today's emission standards, the ammonia-based selective catalytic reduction (SCR) has become the major NOx control strategy for light and heavy diesel engines. Before NOx reduction can proceed, adsorption of ammonia on the acidic sites of the catalyst is necessary. For improvements in efficiency and control of the exhaust gas aftertreatment, a better understanding of the ammonia storage on the acidic sites of zeolite-based SCR catalysts is needed. Thereby, the correlation of dielectric properties of the catalyst material itself with the ammonia storage is a promising approach. Recently, a laboratory setup using microwave cavity perturbation to measure the dielectric properties of catalyst material has been described. This study shows the first experimental data on zeolite-based SCR materials in their H-form. The SCR powder samples are monitored by microwave cavity perturbation while storing and depleting ammonia, both with and without admixed NOx at different temperatures. Its complex dielectric permittivity is found to correlate closely with the stored mass of ammonia. The influence of the temperature and the Si / Al ratio of the zeolite to the ammonia storage behavior are also examined. These measurements disclose different temperature dependencies and differing sensitivities to ammonia storage for both real and imaginary parts of the complex permittivity. The apparent constant sensitivity of the real part can be related to the polarity of the adsorbed ammonia molecules, whereas the imaginary part depends on the Si / Al ratio and is related to the conductivity mechanisms of the zeolite material by proton hopping. It provides information about the zeolite structure and the number of (and the distance between) acidic storage sites, in addition to the stored ammonia mass.

Microwave cavity perturbation technique for measurements of the quantum Hall effect

Cryogenics ◽  
2004 ◽  
Vol 44 (3) ◽  
pp. 183-186 ◽  
Author(s):  
V. Krasovitsky ◽  
D. Terasawa ◽  
K. Nakada ◽  
S. Kozumi ◽  
A. Sawada ◽  
...  
Keyword(s):  
Hall Effect ◽  
Quantum Hall Effect ◽  
Perturbation Technique ◽  
Quantum Hall ◽  
Microwave Cavity ◽  
Cavity Perturbation ◽  
Microwave Cavity Perturbation
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