Results 271 to 280 of about 12,596 (307)

Bioinspired Geometry-Encoded Rheotactic Navigation of Sound-Driven Microrobots

Sun C, Paskert A, Deng Y, Medany M, Wittkowski R, Ahmed D.   +5 more
europepmc   +1 more source

Some of the next articles are maybe not open access.

Related searches:

LARGE-SCALE COSMOLOGICAL MAGNETIC FIELDS AND MAGNETIC HELICITY

International Journal of Modern Physics D, 2005
Role of cosmological magnetic field and cosmological magnetic helicity for astrophysics is considered. We discuss possible mechanisms for cosmological magnetic field production in the early universe as well as upper observational estimate for such field.
Semikoz, V. B., Sokoloff, D. D.
openaire   +2 more sources

Helical magnetic fields in filaments

Solar Physics, 1994
For both even and odd-numbered solar cycles, right-hand heliform filaments predominate at middle and high latitudes in the northern hemisphere while left-handed ones predominate in the south. This recent discovery has prompted a re-examination of past measurements of magnetic fields in prominences. This re-examination indicates that Rust (1967), in his
D. M. Rust, A. Kumar
openaire   +1 more source

Helical winding’s magnetic field in power transformers

Electrical Engineering, 2009
Helical winding is typically used for low voltage and high current winding of large generator transformers. Due to its distinct design (spiral form, small number of turns and high current), some additional eddy-current losses may be expected. Differences in magnetic field produced by helical and cylinder windings are presented in this paper.
Valković, Zvonimir, Štih, Željko, Janić, Žarko   +2 more
openaire   +3 more sources

Field configurations in Helical magnetic wigglers

Review of Scientific Instruments, 1990
We consider the field configuration produced in a system of two intercalcated concentric coils of radius a and pitch Λ carrying currents in opposite directions (magnetic wigglers). The magnetic field and vector potential inside are obtained exactly at the coils axis and in a multipole-type expansion off the axis.
Miguel Calvo, Otto Rendon
openaire   +1 more source

Quadratic helicity and cosmological magnetic fields

International Journal of Geometric Methods in Modern Physics, 2020
In this work, the quadratic helicity [Formula: see text] is discussed from the physical and topological points of view. We show, after the introduction of a mathematical description of the properties of helicity and quadratic helicity in the context of standard dynamo equations, examples of the importance of these high invariants in cosmological ...
Peter Akhmet’ev, Diego Julio Cirilo-Lombardo, Alexandr Smirnov   +2 more
openaire   +3 more sources

Helical Magnetic Fields in AGN Jets

Journal of Astrophysics and Astronomy, 2014
We establish a simple model to describe the helical magnetic fields in AGN jets projected on the sky plane and the line-of-sight. This kind of profile has been detected in the polarimetric VLBI observation of many blazar objects, suggesting the existence of helical magnetic fields in these sources.
Y. J. Chen, G.-Y. Zhao, Z.-Q. Shen
openaire   +1 more source

Magnetic helicity flux for mean magnetic field equations

Theoretical and Mathematical Physics, 2020
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
openaire   +1 more source

Extragalactic Jets with Helical Magnetic Fields

2009
Extragalactic jets harbor dynamically important, organized magnetic fields. We explore with grid-adaptive, high resolution numerical simulations the morphology of AGN jets pervaded by helical field and flow topologies. We concentrate on the long term evolution of kinetic energy dominated jets, penetrating denser clouds. The jets have near-equipartition
Rony Keppens, Zakaria Meliani
openaire   +2 more sources

Maxwellian field expansion of helical magnet

Proceedings of the 1997 Particle Accelerator Conference (Cat. No.97CH36167), 2002
Three dimensional (3D) magnetic field calculated by the computer code TOSCA was analyzed including the fringing field region. The magnetic field in the median plane was well simulated by a simple function. Off median plane, contributions from the coils should be taken into account.
K. Hatanaka, T. Katayama, T. Tominaka
openaire   +1 more source