scholarly journals Rapid inverting of the polarization of a neutron beam using large amplitude oscillating magnetic fields

1970 ◽  
Vol 79 (1) ◽  
pp. 82-92 ◽  
Author(s):  
H. Kendrick ◽  
J.S. King ◽  
S.A. Werner ◽  
A. Arrott
Keyword(s):  
Magnetic Fields ◽  
Neutron Beam ◽  
Large Amplitude

scholarly journals 18. Stellar magnetic fields

1958 ◽  
Vol 6 ◽  
pp. 161-165
Author(s):  
Horace W. Babcock
Keyword(s):  
Magnetic Fields ◽  
Large Amplitude ◽  
Zeeman Effect ◽  
Type A ◽  
Magnetic Fluctuations ◽  
Sharp Line ◽  
Stellar Magnetic Fields ◽  
Observational Program

A report is given of a ten-year observational program directed toward the discovery and investigation of the magnetic fields of stars through the Zeeman effect in their spectra. The emphasis has been on the sharp-line stars of type A, of which ten have been found to show irregular magnetic fluctuations without reversal of polarity, ten others to fluctuate irregularly with occasional reversals of polarity, and six to show essentially periodic variations; of the latter group, four are large-amplitude reversers with periods near one week.

scholarly journals Neutron interferometry, fifth force and axion like particles

2021 ◽  
Vol 81 (12) ◽  
Author(s):  
A. Capolupo ◽  
S. M. Giampaolo ◽  
A. Quaranta
Keyword(s):  
Magnetic Fields ◽  
Neutron Beam ◽  
Phase Difference ◽  
Neutron Interferometry ◽  
Fifth Force ◽  
Neutron Beams ◽  
Detection Strategy ◽  
Interferometric Measurement ◽  
The Future

AbstractWe propose a new possible detection strategy to reveal the fermion–fermion interaction mediated by axions and axion-like particles, based on interferometric measurement of neutron beams. We consider an interferometer in which the neutron beam is split in two sub-beams propagating in regions with differently oriented magnetic fields. The beam paths and the strength of the magnetic fields are set in such a way that the phase difference depends only on the axion-induced interaction. The resulting phase difference is directly related to the presence of axions. Our results show that such a phase might represent, in the future, a tool to probe the existence of axions and axion-like particles or a fifth force with interferometry.

scholarly journals Cyclic fluctuations in the differential rotation of active stars

2006 ◽  
Vol 2 (14) ◽  
pp. 280-281
Author(s):  
Pascal Petit
Keyword(s):  
Magnetic Fields ◽  
Differential Rotation ◽  
Time Scale ◽  
Large Amplitude ◽  
Modeling Tools ◽  
Temporal Fluctuations ◽  
Active Stars ◽  
Stellar Magnetic Fields ◽  
The Impact ◽  
Stellar Dynamo

AbstractDifferential rotation is described in stellar dynamo models as one of the fundamental phenomena governing the amplification of magnetic fields in active stars.Using indirect imaging methods, the measurement of photospheric differential rotation is now achieved on a growing number of very active stars, a fraction of which exhibit temporal fluctuations of potentially large amplitude in their latitudinal shear, on a time-scale of a few years. I first describe the modeling tools on which such analysis is based, then discuss the implications of this observational work on our understanding of stellar dynamos and of the impact stellar magnetic fields may have on the dynamics of convective envelopes.

Zonal flows and magnetic fields driven by large-amplitude Rossby-Alfvén-Khantadze waves in theE-layer ionosphere

2013 ◽  
Vol 118 (12) ◽  
pp. 7822-7833 ◽  
Author(s):  
T. D. Kaladze ◽  
W. Horton ◽  
L. Z. Kahlon ◽  
O. Pokhotelov ◽  
O. Onishchenko
Keyword(s):  
Magnetic Fields ◽  
Large Amplitude ◽  
Zonal Flows

Waves in a time-dependent magnetized electron–positron plasma

1999 ◽  
Vol 61 (1) ◽  
pp. 135-150
Author(s):  
E. T. ROWE
Keyword(s):  
Magnetic Fields ◽  
Large Amplitude ◽  
Phase Speed ◽  
Three Solutions ◽  
Amplitude Wave ◽  
Weak Magnetic Fields ◽  
Electron Positron ◽  
The Magnetic Field ◽  
Large Amplitude Wave ◽  
Insight Into

Waves in a magnetized electron–positron plasma, supporting a large-amplitude electric field E0 of superluminal phase speed, are considered. The case of perturbations with the same phase speed as the large-amplitude wave can be treated exactly, and we restrict our attention to this case, obtaining analytical results. The exact analytical results provide insight into the effect of the magnetic field and the large-amplitude wave on the harmonic structure of the perturbations. Three solutions are found for waves polarized perpendicular to E0. Waves are amplitude-modulated for weak magnetic fields (relative to the strength of the large-amplitude wave) and frequency-modulated for strong magnetic fields. This suggests that frequency modulation may be relevant to pulsars.

scholarly journals Field–Frequency-Dependent Non-linear Rheological Behavior of Magnetorheological Grease Under Large Amplitude Oscillatory Shear

2021 ◽  
Vol 8 ◽  
Author(s):  
Huixing Wang ◽  
Tianxiao Chang ◽  
Yancheng Li ◽  
Shaoqi Li ◽  
Guang Zhang ◽  
...  
Keyword(s):  
Magnetic Fields ◽  
Large Amplitude ◽  
Three Dimensional ◽  
Viscoelastic Behavior ◽  
Shear Thickening ◽  
Oscillatory Shear ◽  
Large Amplitude Oscillatory Shear ◽  
Field Frequency ◽  
Frequency Dependent ◽  
Non Linear

This article investigates the influence of frequency on the field-dependent non-linear rheology of magnetorheological (MR) grease under large amplitude oscillatory shear (LAOS). First, the LAOS tests with different driving frequencies were conducted on MR grease at four magnetic fields, and the storage and loss moduli under the frequency of 0.1, 0.5, 1, and 5 Hz were compared to obtain an overall understanding of the frequency-dependent viscoelastic behavior of MR grease. Based on this, the three-dimensional (3D) Lissajous curves and decomposed stress curves under two typical frequencies were depicted to provide the non-linear elastic and viscous behavior. Finally, the elastic and viscous measures containing higher harmonics from Fourier transform (FT)-Chebyshev analysis were used to quantitatively interpret the influence of the frequency on the non-linear rheology of MR grease, namely, strain stiffening (softening) and shear thickening (thinning), under LAOS with different magnetic fields. It was found that, under the application of the magnetic field, the onset of the non-linear behavior of MR grease was frequency-dependent. However, when the shear strain amplitude increased in the post-yield region, the non-linear rheology of MRG-70 was not affected by the oscillatory frequency.

scholarly journals Magnetization of Rydberg plasmas by electromagnetic waves

2009 ◽  
Vol 76 (1) ◽  
pp. 19-23 ◽  
Author(s):  
J. T. MENDONÇA ◽  
NITIN SHUKLA ◽  
P. K. SHUKLA
Keyword(s):  
Electromagnetic Wave ◽  
Magnetic Fields ◽  
High Frequency ◽  
Large Amplitude ◽  
Electromagnetic Waves ◽  
Ponderomotive Force

AbstractIt is shown that the ponderomotive force of a large-amplitude electromagnetic wave in Rydberg plasmas can generate quasi-stationary magnetic fields. The present result can account for the origin of seed magnetic fields in the ultracold Rydberg plasmas when they are irradiated by the high-frequency electromagnetic wave.

Sign in / Sign up

Export Citation Format

Share Document