Results 301 to 310 of about 274,179 (326)

Arc lengthening between divergent runners: influence of arc current, geometry, and materials of runners and walls

IEEE Transactions on Components, Packaging, and Manufacturing Technology: Part A, 1998
Arc motion along arc runners enclosing different opening angles from 60/spl deg/ to 150/spl deg/, symmetrically arranged, was investigated in a model switch at currents from 1 kA to 5 kA. Wall distance, wall and runner material were varied. The measured criteria were the lengthening time and the frequency of back-strikes.
E. Gauster, W. Rieder
openaire   +1 more source

A novel electrode geometry for high-current vacuum arcs

Journal of Physics D: Applied Physics, 1977
A new electrode geometry, the stirrup, utilizes its own magnetic field to maintain a diffuse high-current vacuum arc at the centre of the electrode system. This arc is reproducible and stable, and the voltage is hash-free. High-speed photographs of a high-current vacuum arc are shown, together with arc voltage and current oscillograms and ...
M R Barrault, C R Melbourne, P D Prewett
openaire   +1 more source

Effect of Electrode Geometry on Arc Flash Protection Boundary

IEEE Transactions on Industry Applications, 2019
In arc flash hazards calculations, protection boundary can be used to gain insight in personnel protection against thermal injuries. Although IEEE 1584-2002 has provided the calculation guide based on tests with the arcing electrodes in a vertical plane, applications where the traditional vertical arrangement is not directly applicable have been ...
Zhenyuan Zhang, Peng Wang, Shiuan-Hau Rau, Wei-Jen Lee   +3 more
openaire   +1 more source

Wildhaber—Novikov circular arc gears: geometry and kinematics

Proceedings of the Royal Society of London. A. Mathematical and Physical Sciences, 1986
An exact analysis of the geometry and kinematics of the Wildhaber—Novikov (W. -N.) system of high-conformity gears is described. The techniques of gear analysis developed by Dyson (1969) are used to obtain the shape of the gap between the gear teeth in contact at zero load.
openaire   +1 more source

Singularities of Birational Geometry via Arcs and Differential Operators

2021
We study singularities of algebraic varieties, in particular those arising in birational geometry, from several points of view. The first is that of arc schemes: arc schemes parametrize “infinitesimal curves” on a variety, and their geometry reflects properties of singularities.
openaire   +2 more sources

Arc erosion characteristics of pseudospark discharge in multiaperture geometry

Journal of Applied Physics, 2002
Analysis of discharge mechanism in especially designed pseudosparks that facilitate pseudospark characteristic low-erosive conduction at very high currents is presented. The alternate formulation of criterion for transition to arc discharge phase developed here enables us to account for the emergence of arcs at each aperture after a threshold electric ...
Ahmer Naweed, Jochen Kiefer, Constantin Gavrilescu, Willi Neff   +3 more
openaire   +1 more source

Application of CFD for Wire-Arc Nozzle Geometry Improvement

International Thermal Spray Conference, 2003
Abstract The present study was devoted to the optimization of the nozzle exit geometry of a TAFA 9000 wire-arc spray gun. Computational Fluid Dynamic was first used in order to examine the effect of different nozzle configurations, considering small changes operated on the original design.
I. Gedzevicius, R. Bolot, H. Liao, C. Coddet, A.V. Valiulis   +4 more
openaire   +1 more source

Arc flash testing update: Effect of arc electrode geometry and distance on cotton shirt ignition

2014 IEEE IAS Electrical Safety Workshop, 2014
The results of experimental arc testing of a nontreated cotton T-shirt with three different geometrical arc electrode arrangements are presented and discussed. Different geometries of arc electrodes result in different electromagnetic interactions of an arc current with current flowing between arc electrodes that in turn cause very different arc ...
Mikhail Golovkov, Elihu Hoagland
openaire   +1 more source

The effect of cathode geometry on the stability of arcs

Journal of Physics D: Applied Physics, 1969
A new technique is presented for stabilizing free-burning d. c. arcs between graphite electrodes in the current range 400-2000 A. The stability of the arcs is shown to be critically dependent on the cathode geometry, and the possible factors influencing the motion of the arc are discussed.
R W Montgomery, C M H Sharp
openaire   +1 more source

Distance geometry of metric arcs II

Archiv der Mathematik, 1958
Abel, William R., Blumenthal, Leonard M.
openaire   +2 more sources