Imaging Electric Signals of a Magnetic Field Transducer with Hysteretic Interference for Testing Metals in Pulsed Magnetic Fields

2020 ◽  
Vol 56 (11) ◽  
pp. 907-914
Author(s):  
V. V. Pavlyuchenko ◽  
E. S. Doroshevich
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Pulsed Magnetic Fields ◽  
Magnetic Field Transducer ◽  
Electric Signals

scholarly journals Martensitic transformation in the systems based on Fe-Ni compositions in strong pulsed magnetic fields

2021 ◽  
pp. 22-29 ◽  
Author(s):  
I. Zolotarevskii
Keyword(s):  
Magnetic Field ◽  
Martensitic Transformation ◽  
Magnetic Fields ◽  
Temperature Dependence ◽  
Strong Magnetic Field ◽  
Low Temperatures ◽  
Strong Dependence ◽  
Magnetic Interaction ◽  
Iron Alloys ◽  
Pulsed Magnetic Fields

Purpose of work. To ascertain the causes of the abnormally large displacement of the martensitic point in steels and iron alloys in strong pulsed magnetic fields at low temperatures. Research methods. Generalization of experimental and theoretical investigations of the strong magnetic field influence on the martensitic transformation in steels and iron alloys, taking into account the magnetic state of austenite. The obtained results. The distributions of the martensitic point displacement ΔMS from the content of the main component - iron and the temperature of the martensitic γ → α- transformation beginning (martensitic point MS) in different experiments are obtained. It is shown that the obtained temperature dependence ΔMS(MS) in a strong magnetic field at low temperatures decomposes into two components, one of which correlates with the generalized Clapeyron-Clausius equations, and the other is opposite to it. In addition, it was found that steels and alloys with intense γ → α- transformation in a magnetic field contain at least 72.5% iron (wt), which at low temperatures in the fcc structure is antiferromagnetic. Scientific novelty. The anomalous temperature dependence of the distribution ΔMS(MS) in a strong magnetic field is explained on the basis of quantum representations of the magnetic interaction of atoms in the Fe-Ni system. This effect is associated with a number of other invar effects, in particular, with an abnormally large spontaneous and forced magnetostriction, a strong dependence of the resulting exchange integral on the interatomic distance. The point of view according to which in these alloys in a magnetic field γ → α- transformation occurs by the type of “magnetic first kind phase transformation” is substantiated. It is assumed that the nucleation of the martensitic phase in a magnetic field occurs in (at) local regions of γ- phase with disoriented atomic magnetic moments (with high compression and increased forced magnetostriction). Practical value. The information obtained in this work provides grounds for explaining the kinetic features of the transformation of austenite into martensite in steels and iron alloys.

Effect of Pulsed Magnetic Fields on Cholesterol and Tryglyceride Levels in Rats Study of Field Intensity and Length of Exposure

1996 ◽  
Vol 51 (7-8) ◽  
pp. 603-606 ◽  
Author(s):  
A. Bellossi ◽  
V. Pouvreau-Quillien ◽  
C. Rocher ◽  
M. Ruelloux
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Field Intensity ◽  
Plasma Levels ◽  
Pulsed Magnetic Field ◽  
Pulsed Magnetic Fields ◽  
Minute Exposure ◽  
Linear Effect ◽  
Non Linear Effect ◽  
Non Linear

Abstract In a previous work a decrease in cholesterol and triglyceride plasma levels was observed in rats 24 hours after their exposure to a 12 Hz 6 mT pulsed magnetic field (PMF). This time, a study of intensity effects of a 12 Hz PMF for a sixty-minute exposure and of length of exposure for a 12 Hz 6 mT PMF took place. Non-linear effect-dose relationships were ob­ served for the PMF intensity as well as for the length of exposure used. The highest decreases in cholesterol and triglyceride levels were obtained after to a sixty-minute exposure with 1.5 mT and 12 mT.

scholarly journals Neutron and X-ray Diffraction from Exotic Magnets in Pulsed Magnetic Fields

2014 ◽  
Vol 70 (a1) ◽  
pp. C149-C149
Author(s):  
Bruce Gaulin
Keyword(s):  
Magnetic Field ◽  
Low Temperature ◽  
Magnetic Fields ◽  
Capacitor Bank ◽  
Pulsed Magnetic Fields ◽  
New Materials ◽  
X Ray Diffraction ◽  
Time Resolved ◽  
X Ray ◽  
Helmholtz Coils

Magnetic fields obtained by discharging a large capacitor bank through Helmholtz coils can be produced in excess of 25 T for relatively short periods of time, ~ 1 msec and longer. When combined with modern facilities for diffraction at modern neutron and synchrotron x-ray sources, one can study the structure and phase diagrams of new materials under extremes of magnetic field. I will present two such studies, each focussing on a new magnetic material which exhibit exotic low temperature states. I will show time-resolved neutron Laue diffraction on the multiferroic magnet MnWO4 [1], and time-resolved synchrotron x-ray studies of large magneto-elastic effects in the geometrically-frustarted pyrochlore magnet Tb2Ti2O7 [2], both in magnetic fields up to ~ 30 T. Such studies of new materials in extreme sample environments can be very revealing as to the nature of their exotic low temperature states.

Exciton Diamagnetic Shifts and Magnetic Field Dependent Linewidths in Ordered and Disordered InGaP Alloys

2001 ◽  
Vol 692 ◽  
Author(s):  
E. D. Jones ◽  
K. K. Bajaj ◽  
G. Coli ◽  
S. A. Crooker ◽  
Yong Zhang ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Order Parameter ◽  
Free Exciton ◽  
Pulsed Magnetic Field ◽  
Pulsed Magnetic Fields ◽  
Exciton Model ◽  
Field Dependent ◽  
Excitonic Transitions ◽  
Lattice Matched

AbstractWe have measured the diamagnetic shifts and photoluminescence linewidths of excitonic transitions in ordered and disordered In0.48 Ga0.52 P alloys, lattice matched to GaAs, in pulsed magnetic fields at 4 and 76K. The pulsed magnetic field ranged between 0 and 50T. The variations diamagnetic shifts with magnetic field in disordered and weakly ordered samples are considerably smaller than those calculated using a free exciton model. For a given magnetic field, the value of the diamagnetic shifts are found to increase with increasing order parameter. Furthermore, for all samples, the diamagnetic shifts at 76K are larger than at 4K suggesting that the excitons are strongly localized.

scholarly journals Influence of pulsed modes of a magnetic field on an electric vortex flow

2021 ◽  
Vol 2088 (1) ◽  
pp. 012050
Author(s):  
D A Vinogradov ◽  
I O Teplyakov ◽  
Yu P Ivochkin ◽  
K A Shihov ◽  
A V Zhidkov
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Liquid Metal ◽  
Vortex Flow ◽  
Fiber Optic ◽  
Pulsed Magnetic Field ◽  
Pulsed Magnetic Fields ◽  
Velocity Transducer

Abstract Using a fiber-optic velocity transducer, the effect of external pulsed magnetic fields on the structure of electrovortex flows is experimentally investigated. It is shown that an external pulsed magnetic field can lead to the appearance of oscillations of significant amplitude in a liquid metal.

A Small-Sized and Battery-Supplied Data Acquisition System for the Electromagnetic Launcher to Measure Pulsed Magnetic Fields

2017 ◽  
Vol 870 ◽  
pp. 85-92
Author(s):  
Rong Gang Cao ◽  
Xiang Cai Xu
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Data Acquisition ◽  
Data Acquisition System ◽  
Acquisition System ◽  
Pulsed Magnetic Fields ◽  
Electromagnetic Launcher ◽  
Contact Surfaces ◽  
Sd Card ◽  
Transient Magnetic Fields

In rail-gun launchers, the main current is pulsed and can reach up to several MA. The width of the pulse is about 2 - 4ms. When pulsed currents are supplied from the pulse power, it will generate a large transient magnetic field around the armature. Meanwhile, the armature will be accelerated up to 2km/s by a large electromagnetic force. In order to research the features of the fields around contact surfaces between rails and the armature, it needs to use a small-sized and battery-supplied data acquisition system to measure pulsed magnetic fields. The B-dot probe acts as a sensor to acquire the transient magnetic fields. All data will be stored in a SD card. The armature and SD card will be caught and fetched back after the launching. The system would be suitable and useful for the electromagnetic launcher design.

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