scholarly journals Determination of the quiet time current sheet thickness using Geotail CPI data and nonlinear dynamics modeling

2006 ◽  
Vol 111 (A6) ◽  
Author(s):  
D. L. Holland ◽  
B. H. Richards ◽  
I. H. M. Ronquist ◽  
J. A. Ansher ◽  
W. R. Paterson ◽  
...  
Keyword(s):  
Nonlinear Dynamics ◽  
Current Sheet ◽  
Sheet Thickness ◽  
Dynamics Modeling ◽  
Quiet Time

DETERMINATION OF LIGHT SHEET THICKNESS IN PIV

1995 ◽  
Vol 2 (3) ◽  
pp. 259-266 ◽  
Author(s):  
Mahmoud F. Maghrebi ◽  
Kiyosi Kawanisi ◽  
Shoitiro Yokosi
Keyword(s):  
Sheet Thickness ◽  
Light Sheet

Current sheet thickness of the outer boundary of the magnetosphere as observed by four CLUSTER satellites

2007 ◽  
Vol 45 (3) ◽  
pp. 268-272 ◽  
Author(s):  
E. V. Panov ◽  
S. P. Savin ◽  
J. Büchner ◽  
A. Korth
Keyword(s):  
Current Sheet ◽  
Outer Boundary ◽  
Sheet Thickness

scholarly journals Electric fields and double layers in plasmas

1987 ◽  
Vol 5 (2) ◽  
pp. 233-255 ◽  
Author(s):  
Nagendra Singh ◽  
H. Thiemann ◽  
R. W. Schunk
Keyword(s):  
Magnetic Field ◽  
Current Sheet ◽  
Electric Fields ◽  
Sheet Thickness ◽  
High Density ◽  
Effective Length ◽  
Double Layers ◽  
Low Density ◽  
Ambient Magnetic Field ◽  
Cold Plasmas

Various mechanisms for driving double layers in plasmas are briefly described, including applied potential drops, currents, contact potentials, and plasma expansions. Some dynamic features of the double layers are discussed. These features, as seen in simulations, laboratory experiments and theory, indicate that double layers and the currents through them undergo slow oscillations, which are determined by the ion transit time across an effective length of the system in which the double layers form. It is shown that a localized potential dip forms at the low potential end of a double layer, which interrupts the electron current through it according to the Langmuir criterion, whenever the ion flux into the double is disrupted. The generation of electric fields perpendicular to the ambient magnetic field by contact potentials is also discussed. Two different situations have been considered; in one, a low-density hot plasma is sandwiched between high-density cold plasmas, while in the other a high-density current sheet permeates a low-density background plasma. Perpendicular electric fields develop near the contact surfaces. In the case of the current sheet, the creation of parallel electric fields and the formation of double layers are also discussed when the current sheet thickness is varied. Finally, the generation of electric fields (parallel to an ambient magnetic field) and double layers in an expanding plasma are discussed.

Nonlinear dynamics modeling and performance prediction for underactuated AUV with fins

2015 ◽  
Vol 84 (1) ◽  
pp. 237-249 ◽  
Author(s):  
Xiao Liang ◽  
Ye Li ◽  
Zhouhua Peng ◽  
Jundong Zhang
Keyword(s):  
Nonlinear Dynamics ◽  
Performance Prediction ◽  
Dynamics Modeling ◽  
Underactuated Auv ◽  
And Performance

Observational determination of the adiabatic index in the quiet time plasma sheet

1989 ◽  
Vol 16 (6) ◽  
pp. 563-566 ◽  
Author(s):  
C. Y. Huang ◽  
C. K. Goertz ◽  
L. A. Frank ◽  
G. Rostoker
Keyword(s):  
Plasma Sheet ◽  
Adiabatic Index ◽  
Quiet Time

CHARACTERIZATION OF FLOW CURVES FOR ULTRA-THIN STEEL SHEETS WITH THE IN-PLANE TORSION TEST

2021 ◽  
pp. 1-25
Author(s):  
Fabian Stiebert ◽  
Heinrich Traphöner ◽  
Rickmer Meya ◽  
A. Erman Tekkaya
Keyword(s):  
Sheet Thickness ◽  
High Strength ◽  
Torsion Test ◽  
New Method ◽  
Bulge Test ◽  
Thin Sheets ◽  
Flow Curves ◽  
Steel Sheets

Abstract The in-plane torsion test is a shear test that has already been successfully used to determine flow curves up to high strains for thin sheets with thicknesses between 0.5 mm and 3.0 mm. In the same way as with other shear tests, the formation of wrinkles is a major challenge in determining flow curves with the in-plane torsion test, especially when testing ultra-thin sheets with a thickness between 0.1 mm and 0.5 mm. A new method for suppressing wrinkling is introduced, in which the formation of wrinkles is avoided by arranging and gluing single sheets to multi-layered specimens. The influence of the used adhesive on the determination of flow curves is negligible. The proposed method is used to identify flow curves for two materials, the high strength steel TH620 and the soft steel TS230, used in the packaging industry. The Materials are tested in sheet thicknesses between 0.17 mm and 0.6 mm. The determined equivalent plastic strains for the TH620 with a sheet thickness of 0.20 mm, could be increased from 0.38 (bulge-test) to over 0.8 with the new method by using four-layered specimens.

scholarly journals Magnetic turbulence and particle dynamics in the Earth’s magnetotail

2003 ◽  
Vol 21 (9) ◽  
pp. 1947-1953 ◽  
Author(s):  
G. Zimbardo ◽  
A. Greco ◽  
A. L. Taktakishvili ◽  
P. Veltri ◽  
L. M. Zelenyi
Keyword(s):  
Magnetic Field ◽  
Current Sheet ◽  
Sheet Thickness ◽  
Particle Dynamics ◽  
Particle Simulation ◽  
Mhd Waves ◽  
Magnetic Fluctuations ◽  
Magnetic Turbulence ◽  
Magnetospheric Configuration And Dynamics ◽  
Interplanetary Physics

Abstract. The influence of magnetic turbulence in the near-Earth magnetotail on ion motion is investigated by numerical simulation. The magnetotail current sheet is modelled as a magnetic field reversal with a normal magnetic field com-ponent Bn , plus a three-dimensional spectrum of magnetic fluctuations dB which represents the observed magnetic turbulence. The dawn-dusk electric field Ey is also considered. A test particle simulation is performed using different values of Bn and of the fluctuation level dB/B0. We show that when the magnetic fluctuations are taken into account, the particle dynamics is deeply affected, giving rise to an increase in the cross tail transport, ion heating, and current sheet thickness. For strong enough turbulence, the current splits in two layers, in agreement with recent Cluster observations.Key words. Magnetospheric physics (magnetospheric configuration and dynamics) – Interplanetary physics (MHD waves and turbulence) – Electromagnetics (numerical methods)

scholarly journals A new current weigher, and a determination of the electromotive force of the normal weston cadmium cell

1907 ◽  
Vol 80 (535) ◽  
pp. 12-18
Keyword(s):  
Current Sheet ◽  
Electromotive Force ◽  
Unit Length ◽  
Screw Thread ◽  
Late Professor ◽  
Convenient Formula ◽  
Association Meeting ◽  
Helical Current ◽  
Mutual Induction

The instrument described is the outcome of conversations between the late Professor J. Viriamu Jones, F. R. S., and one of the authors (W. E. A.), on their return from the British Association Meeting held in Toronto in 1897. Its object was to determine “ the ampere ” as defined in the C. G. S. system, to an accuracy comparable with that attained in the absolute determination of the ohm by Lorenz’s apparatus, an account of which was given by Professors Ayrton and Jones at the Toronto Meeting. Professor Jones had previously developed a convenient formula for calculating the electromagnetic force between a helical current and a coaxial current sheet, viz., F = γ h γ (M 2 -M 1 ),† where γ h is the current in the helix, the γ current per unit length of the current sheet, and M 1 , M 2 the coefficients of mutual induction of the helix and the two ends of the current sheet respectively. By using coaxial coils with single layers of wire wound in screw-thread grooves, advantage could be taken of the above formula.

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