Determination of the timing properties of a pulsed positron lifetime beam by the application of an electron gun and a fast microchannel plate

2006 ◽  
Vol 252 (9) ◽  
pp. 3148-3153 ◽  
Author(s):  
A. Laakso ◽  
A. Pelli ◽  
K. Rytsölä ◽  
K. Saarinen ◽  
P. Hautojärvi
Keyword(s):  
Positron Lifetime ◽  
Microchannel Plate ◽  
Electron Gun ◽  
Timing Properties

Free Volume Determination of Azobenzene−PMMA Copolymer by a Pulsed Low-Energy Positron Lifetime Beam with in-Situ UV Illumination

2004 ◽  
Vol 37 (21) ◽  
pp. 8035-8042 ◽  
Author(s):  
John Algers ◽  
Peter Sperr ◽  
Werner Egger ◽  
Laszlo Liszkay ◽  
Gottfried Kögel ◽  
...  
Keyword(s):  
Free Volume ◽  
Positron Lifetime ◽  
Low Energy ◽  
Volume Determination ◽  
Uv Illumination

scholarly journals The determination of the GX 339-4's mass based on its 2010 outburst

2010 ◽  
Vol 6 (S275) ◽  
pp. 327-328
Author(s):  
Tao Chen
Keyword(s):  
Black Hole ◽  
Timing Analysis ◽  
Periodic Oscillation ◽  
Spectral Parameters ◽  
Quasi Periodic Oscillation ◽  
Black Hole Candidate ◽  
Centroid Frequency ◽  
Timing Properties ◽  
The Relationship

AbstractIn this paper we investigate the quasi periodic oscillation (QPO) behavior of the black hole candidate GX 339-4 during its 2010 outburst using RXTE/PCA data. We perform spectral and timing analysis of the observations, where the QPOs are observed. We analyze the relationship between the centroid frequency of QPO and the spectral parameters. The correlation of spectral and timing properties can be used to estimate the mass of black hole with the scaling method. Using this method we estimate a mass of 7.5 ± 0.8 M⊙ of GX 339-4.

Three-Dimensional Electron-Beam Deflection and Missed Joint in Welding Dissimilar Metals

1997 ◽  
Vol 119 (4) ◽  
pp. 832-839 ◽  
Author(s):  
P. S. Wei ◽  
F. K. Chung
Keyword(s):  
Electron Beam ◽  
Electrical Contact ◽  
Three Dimensional ◽  
Electron Gun ◽  
Beam Deflection ◽  
Beam Power ◽  
Dissimilar Metals ◽  
Electrical Contact Resistance ◽  
Paraboloid Of Revolution

Three-dimensional deflection of the electron beam resulting in a missed joint due to thermoelectric magnetism generated while welding dissimilar metals is systematically investigated. The incident energy rate distribution is assumed to be Gaussian and the deep and narrow welding cavity induced is idealized as a paraboloid of revolution. With a three-dimensional analytical solution for the temperature and by solving Maxwell’s electromagnetic equations, thermoelectric currents, magnetic flux densities, and deflections of the beam are found. The predictions agree with available experimental data. The results find that missed joints can be reduced by increasing the dimensionless accelerating voltage-to-Seebeck e.m.f. parameter, Peclet number, and effective electrical contact resistance parameter, and decreasing dimensionless beam power, magnetic permeabilities, and electrical conductivity ratio between metals 1 and 2. Tilting workpieces and shifting the electron gun from the joint line are also feasible. A three-dimensional analysis is required for a successful determination of beam deflection.

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