Results 31 to 40 of about 11,871 (158)
Magnetic helicity of the Parker field
The Astrophysical Journal, 1987 The topological properties of the interplanetary magnetic field are discussed based on a calculation of the magnetic helicity of the Parker field. The most striking feature of the helicity is that it is negative north of the heliospheric current sheet and positive south of the current sheet, regardless of the sign of the solar poloidal magnetic field ...
J. W. Bieber +2 more
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Helicity of the solar magnetic field [PDF]
Proceedings of the International Astronomical Union, 2010 AbstractHelicity measures complexity in the field. Magnetic helicity is given by a volume integral over the scalar product of magnetic field B and its vector potential A. A direct computation of magnetic helicity in the solar atmosphere is not possible due to unavailability of the observations at different heights and also due to non-uniqueness of A ...
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Magnetic localization and control of helical robots for clearing superficial blood clots
APL Bioengineering, 2019 This work presents an approach for the localization and control of helical robots during removal of superficial blood clots inside in vitro and ex vivo models.
Islam S. M. Khalil +6 more
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Electric Currents along Astrophysical Jets
Galaxies, 2017 Astrophysical black holes and their surrounding accretion disks are believed to be threaded by grand design helical magnetic fields. There is strong theoretical evidence that the main driver of their winds and jets is the Lorentz force generated by these
Ioannis Contopoulos
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Magnetohydrodynamical Models of Helical Magnetic Fields in Spiral Arms [PDF]
Symposium - International Astronomical Union, 1969 A circular arm with elliptical cross-section is used as a model of the spiral arm. It is demonstrated magnetohydrodynamically that interstellar gas may flow in a helical path along the axis of the arm and interstellar helical magnetic lines of force can spiral around it.
Mitsuaki Fujimoto, Masanori Miyamoto
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Inherent and Local Magnetic Field Structures in Jets from Active Galactic Nuclei
Galaxies, 2021 In theoretical models for the electromagnetic launching of astrophysical jets, a helical magnetic (B)-field component is generated through the winding up of an initial longitudinal field component by the rotation of the cental black hole and accretion ...
Denise C. Gabuzda
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Swimming Characteristics of Bioinspired Helical Microswimmers Based on Soft Lotus-Root Fibers
Micromachines, 2017 Various kinds of helical swimmers inspired by E. coli bacteria have been developed continually in many types of researches, but most of them are proposed by the rigid bodies.
Jia Liu +5 more
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Magnetic field of complex helical conductors [PDF]
Archives of Electrical Engineering, 2013 Abstract Transmission of the electric power is accompanied with generation of low - frequency electromagnetic fields. Electromagnetic compatibility studies require that the fields from sources of electric power be well known. Unfortunately, many of these sources are not defined to the desired degree of accuracy. This applies e.g. to the case of the
Krzysztof Budnik, Wojciech Machczyński
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Independent Control and Path Planning of Microswimmers with a Uniform Magnetic Field
Advanced Intelligent Systems, 2022 Artificial bacteria flagella (ABFs) are magnetic helical microswimmers that can be remotely controlled via a uniform, rotating magnetic field. Previous studies have used the heterogeneous response of microswimmers to external magnetic fields for ...
Lucas Amoudruz, Petros Koumoutsakos
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Estimate of the Primordial Magnetic Field Helicity
Physical Review Letters, 2001 Physical Review ...
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