Application of Magnetovision Scanning System for Detection of Dangerous Objects

2015 ◽  
Vol 220-221 ◽  
pp. 355-360
Author(s):  
Michał Nowicki ◽  
Roman Szewczyk
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Measurement System ◽  
Field Vector ◽  
Magnetic Field Vector ◽  
Scanning System ◽  
Passive Detection ◽  
Weak Magnetic Fields ◽  
The Magnetic Field

This paper presents application of magnetovision scanning system for detection of dangerous objects in weak magnetic fields. Measurement system was developed to study the magnetic field vector distributions. The measurements of the Earth’s field disturbances caused by dangerous ferromagnetic objects were carried out. The ability for passive detection of hidden dangerous objects and determine their location was demonstrated.

scholarly journals The inference of the magnetic field vector in prominences

2013 ◽  
Vol 8 (S300) ◽  
pp. 101-111
Author(s):  
Bruce W. Lites
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Solar Corona ◽  
Field Vector ◽  
Magnetic Field Vector ◽  
New Techniques ◽  
Field Geometry ◽  
The Magnetic Field

AbstractProminences owe their existence to the presence of magnetic fields in the solar corona. The magnetic field determines their geometry and is crucial to their stability, energetics, and dynamics. This review summarizes techniques for measurement of the magnetic field vector in prominences. New techniques for inversions of full Stokes spectro-polarimetry, incorporating both the Zeeman and Hanle mechanisms for generation and modification of polarization, are now at the forefront. Also reviewed are measurements of the magnetic fields in the photosphere below prominences, and how they may be used to infer the field geometry in and surrounding the prominence itself.

scholarly journals Discovery of weak magnetic fields in four DZ white dwarfs in the local 20 pc volume

2019 ◽  
Vol 630 ◽  
pp. A65 ◽  
Author(s):  
S. Bagnulo ◽  
J. D. Landstreet
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
White Dwarfs ◽  
Field Measurements ◽  
Weak Magnetic Fields ◽  
Polluted Atmosphere ◽  
Highly Sensitive ◽  
Cool White Dwarfs ◽  
The Magnetic Field ◽  
Made In

We report the discovery of weak magnetic fields in three white dwarfs within the local 20 pc volume (WD 0816−310, WD 1009−184, and WD 1532+129), and we confirm the magnetic nature of a fourth star (WD 2138−332) in which we had previously detected a field at a 3σ level. The spectra of all these white dwarfs are characterised by the presence of metal lines and lack of H and He lines, that is, they belong to the spectral class DZ. The polarisation signal of the Ca II H+K lines of WD 1009−184 is particularly spectacular, with an amplitude of 20% that is due to the presence of a magnetic field with an average line-of-sight component of 40 kG. We have thus established that at least 40% of the known DZ white dwarfs with an He-rich atmosphere contained in the 20 pc volume have a magnetic field, while further observations are needed to establish whether the remaining DZ white dwarfs in the same volume are magnetic or not. Metal lines in the spectra of DZ white dwarfs are thought to have originated by accretion from rocky debris, and it might be argued that a link exists between metal accretion and higher occurrence of magnetism. However, we are not able to distinguish whether the magnetic field and the presence of a polluted atmosphere have a common origin, or if it is the presence of metal lines that allows us to detect a higher frequency of magnetic fields in cool white dwarfs, which would otherwise have featureless spectra. We argue that the new highly sensitive longitudinal field measurements that we have made in recent years are consistent with the idea that the magnetic field appears more frequently in older than in younger white dwarfs.

Magnetic fields end-face effect investigation of HTS bulk over PMG with 3D-modeling numerical method

2015 ◽  
Vol 29 (25n26) ◽  
pp. 1542041
Author(s):  
Yujie Qin ◽  
Yiyun Lu
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Numerical Method ◽  
3D Modeling ◽  
Field Vector ◽  
Vector Method ◽  
Hts Bulk ◽  
Levitation System ◽  
Electromagnetic Behavior ◽  
The Magnetic Field

In this paper, the magnetic fields end-face effect of high temperature superconducting (HTS) bulk over a permanent magnetic guideway (PMG) is researched with 3D-modeling numerical method. The electromagnetic behavior of the bulk is simulated using finite element method (FEM). The framework is formulated by the magnetic field vector method (H-method). A superconducting levitation system composed of one rectangular HTS bulk and one infinite long PMG is successfully investigated using the proposed method. The simulation results show that for finite geometrical HTS bulk, even the applied magnetic field is only distributed in [Formula: see text]–[Formula: see text] plane, the magnetic field component Hz which is along the [Formula: see text]-axis can be observed interior the HTS bulk.

scholarly journals DEVICE FOR RESEARCHES OF MAGNETIC FIELD IMPACT UPON “WHEEL-RAIL” FRICTION PAIR CHARACTERISTICS

2020 ◽  
Vol 2020 (1) ◽  
pp. 34-39
Author(s):  
Dmitriy Antipin ◽  
Vladimir Vorob'ev ◽  
Maksim Maslov ◽  
Vadim Korchagin
Keyword(s):  
Magnetic Field ◽  
Friction Pair ◽  
Point Contact ◽  
Field Vector ◽  
Magnetic Field Vector ◽  
Original Design ◽  
Magnetic Conductor ◽  
Magnetizing Force ◽  
The Impact ◽  
The Magnetic Field

The paper is dedicated to the circuit diagram substantiation of the specialized roller bench for researches of the magnetic field impact upon wheel adhesion with a rail. On the basis of the analysis of the experimental plants available at present for the study of the contact interaction of wheels with rails it is defined that two-roller benches are the most efficient for the investigation of different outer factors impact upon wheel adhesion with a rail. Taking into account mentioned above there is offered an original design of the two-roller bench equipped with the device for friction area magnetization. Two cylinders with parallel axes are theoretically a friction pair. Taking into account the presence of a non-concurrency arisen at roller manufacturing and mounting a point contact is realized in the bench. A bench formation is carried out according to a modular approach with the installation of rotary magnetic conductors. For the support of the largest magnetization of a friction area in longitudinal and transverse directions and for the decrease of stray flux in the bench there is realized a series connection of roller friction area with the sources of a magnetizing force. For the substantiation of rotary magnetic conductor position choice regarding a friction area of bench rollers there is carried out an analysis of magnetic field distribution in the friction area depending on the location of magnetic conductors. On the basis of the investigation results it is defined that a change of magnetic conductor position changes the orientation of a magnetic field vector, at that a roller friction area is magnetized in transverse and longitudinal directions. In view of this the bench design offered allows investigating the impact of longitudinal and cross magnetic fields upon friction in the contact of a wheel with a rail. Furthermore, it is defined that at small values of an angle between the direction of a magnetic field vector and the plane of a roller friction area a possibility to exclude the effect of roller magnetic additional loading appears.

scholarly journals Magnetic Absorption of Metal Nanoparticles

2018 ◽  
Vol 63 (10) ◽  
pp. 906 ◽  
Author(s):  
P. M. Tomchuk ◽  
V. M. Starkov
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Wave ◽  
Metal Nanoparticles ◽  
Symmetry Axis ◽  
Field Vector ◽  
Magnetic Field Vector ◽  
Incident Electromagnetic Wave ◽  
The Magnetic Field

The dependences of the magnetic absorption by spheroidal metal nanoparticles on the ratio between the particle curvature radii and the angle between the spheroid symmetry axis and the magnetic field vector of an incident electromagnetic wave are plotted and theoretically analyzed. An interesting result of the research is the growth of the energy absorbed by a spheroidal nanoparticle, as it becomes more oblate.

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