NMR study of spectral densities over a large frequency range for intermolecular relaxation in liquids: Pair correlation effects

1983 ◽  
Vol 78 (9) ◽  
pp. 5809-5815 ◽  
Author(s):  
J. P. Albrand ◽  
M. C. Taieb ◽  
P. H. Fries ◽  
E. Belorizky
Keyword(s):  
Pair Correlation ◽  
Correlation Effects ◽  
Frequency Range ◽  
Spectral Densities ◽  
Nmr Study ◽  
Large Frequency ◽  
Intermolecular Relaxation

Double membrane sensors for liquid viscosity and mass density facilitating measurements in a large frequency range

2010 ◽  
Author(s):  
Martin Heinisch ◽  
Thomas Voglhuber-Brunnmaier ◽  
Alexander Niedermayer ◽  
Bernhard Jakoby ◽  
Erwin K Reichel
Keyword(s):  
Mass Density ◽  
Liquid Viscosity ◽  
Frequency Range ◽  
Double Membrane ◽  
Large Frequency

Single‐mode cw dye laser with large frequency range tunability

1974 ◽  
Vol 24 (3) ◽  
pp. 142-144 ◽  
Author(s):  
S. Liberman ◽  
J. Pinard
Keyword(s):  
Single Mode ◽  
Dye Laser ◽  
Frequency Range ◽  
Large Frequency

Outstanding Stellar Microwave Flares in 1986

1987 ◽  
Vol 7 (1) ◽  
pp. 55-59 ◽  
Author(s):  
O. B. Slee ◽  
G. J. Nelson ◽  
R. T. Stewart ◽  
Alan E. Wright ◽  
David L. Jauncey ◽  
...  
Keyword(s):  
Magnetic Fields ◽  
Main Sequence ◽  
Relativistic Electrons ◽  
Spectral Indices ◽  
Frequency Range ◽  
High Brightness ◽  
Brightness Temperatures ◽  
Simultaneous Measurements ◽  
Gyrosynchrotron Emission ◽  
Large Frequency

AbstractWe describe bright microwave events that were first detected with the Parkes 64-m telescope at 8.4 or 22 GHz from six active-chromosphere stars. In some flares spectral data were obtained over a large frequency range from simultaneous measurements with the Parkes reflector (8.4 or 22 GHz), the Tidbinbilla interferometer (8.4 and 2.29 GHz), the Fleurs synthesis telescope (1.42 GHz) and the Molonglo Observatory synthesis telescope (0.843 GHz). Data on circular polarization were obtained from the Parkes observations at 8.4 GHz.The stars were in a wide variety of evolutionary states, ranging from a single pre-main-sequence star (HD 36705), two RS CVn binaries (HD 127535, HD 128171), an Algol (HD 132742) and two apparently single K giants (HD 32918 and HD 196818). Their high brightness temperatures, positive spectral indices and low polarization are consistent with optically thick gyrosynchrotron emission from mildly relativistic electrons with average energies 0.5 to 3 MeV gyrating in inhomogeneous magnetic fields of 5 to 100 G.

scholarly journals A technique for non-intrusive greedy piecewise-rational model reduction of frequency response problems over wide frequency bands

2022 ◽  
Vol 12 (1) ◽  
Author(s):  
Davide Pradovera ◽  
Fabio Nobile
Keyword(s):  
Frequency Response ◽  
Order Reduction ◽  
Rational Interpolation ◽  
Frequency Range ◽  
Model Order ◽  
Adaptive Selection ◽  
Rational Models ◽  
Numerical Instabilities ◽  
Large Frequency ◽  
Selection Of

AbstractIn the field of model order reduction for frequency response problems, the minimal rational interpolation (MRI) method has been shown to be quite effective. However, in some cases, numerical instabilities may arise when applying MRI to build a surrogate model over a large frequency range, spanning several orders of magnitude. We propose a strategy to overcome these instabilities, replacing an unstable global MRI surrogate with a union of stable local rational models. The partitioning of the frequency range into local frequency sub-ranges is performed automatically and adaptively, and is complemented by a (greedy) adaptive selection of the sampled frequencies over each sub-range. We verify the effectiveness of our proposed method with two numerical examples.

Pair‐Correlation Effects in a System of Coupled Rotators

1964 ◽  
Vol 41 (7) ◽  
pp. 1937-1946 ◽  
Author(s):  
W. C. Tait ◽  
Hubert M. James
Keyword(s):  
Pair Correlation ◽  
Correlation Effects ◽  
Coupled Rotators

scholarly journals Miniaturized Coplanar Waveguide for Nanostructured Magnetostrictive Multilayer Characterization

Proceedings ◽  
2019 ◽  
Vol 2 (13) ◽  
pp. 851
Author(s):  
Abdelhatif El Fellahi ◽  
Aurélien Mazzamurro ◽  
Jean Claude Gerbedoen ◽  
Yannick Dusch ◽  
Olivier Bou Matar ◽  
...  
Keyword(s):  
Coplanar Waveguide ◽  
Complex Permeability ◽  
Network Analyzer ◽  
Scattering Parameters ◽  
Frequency Range ◽  
Electromagnetic Simulations ◽  
Insertion Losses ◽  
The Magnetic Field ◽  
Large Frequency ◽  
Permeability Spectrum

A miniaturized coplanar waveguide (CPW) on a Y-cut LiNbO3 substrate operating in Radio Frequency region (RF) is proposed for studying of magnetostrictive multi-layered structure. The structure is composed of a 14 × [TbCo2 (3.7 nm)/FeCo (4 nm)] nanostructured multi-layer. Using microtechnology process, the miniaturized CPW has been designed with a 50 µm wide signal line in the frequency range from 6 MHz to 6 GHz. Electromagnetic simulations based on ®Ansys/HFSS demonstrate insertion losses less than 2 dB and show that the magnetic field is more confined in the nanostructured multi-layer placed on top of the micro-sized CPW. By using Vectorial Network Analyzer (VNA) the Ferromagnetic Resonance (FMR) is investigated from the reflection (Sii) or transmission (Sij) coefficients of scattering parameters. An inversion model is finally used to extract the complex permeability spectrum of the thin-film in a large frequency range.

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