Validation of the Pipe in Pipe vibration software model to determine ground-borne noise and vibration levels above construction tunnels and the determination of end corrections for different train operating scenarios

2014 ◽  
Vol 135 (4) ◽  
pp. 2288-2288
Author(s):  
Graham Parry ◽  
Steve Summers ◽  
David Yates
Keyword(s):  
Noise And Vibration ◽  
Software Model ◽  
End Corrections ◽  
Pipe Vibration

Modified Methods for Image Processing of Laser Beam Profiles

2020 ◽  
pp. 161-198
Author(s):  
Sergii Bilan
Keyword(s):  
Image Processing ◽  
Information Processing ◽  
Laser Radiation ◽  
Laser Beam ◽  
Laser Beams ◽  
Software Model ◽  
Image Contour ◽  
Laser Profile

The chapter is devoted to the analysis of the object of the study and highlighted its features as a means of information processing. The review of the existing methods of processing images of the profiles of laser beams, the principles of the operation of systems on the basis of similar algorithms, an analysis of the accuracy of the determination of the energy and geometric centers of the beam of laser beam, its diameter, and the differences of laser radiation are carred out. On the basis of the introduced criterion for estimating the symmetry of the contour of an image of a laser profile, a method for finding the optimal center for such an image is proposed. A comparative software model of effective methods for analysis of laser radiation parameters, namely, the search for laser image contour centers and the determination of the diameter of a laser beam, was constructed.

Galactic orbits of stars

1966 ◽  
Vol 25 ◽  
pp. 93-97
Author(s):  
Richard Woolley
Keyword(s):  
Globular Cluster ◽  
Potential Field ◽  
High Velocity ◽  
Velocity Vector ◽  
Variable Stars ◽  
The Sun ◽  
Proper Motions ◽  
Rr Lyrae ◽  
The Galaxy

It is now possible to determine proper motions of high-velocity objects in such a way as to obtain with some accuracy the velocity vector relevant to the Sun. If a potential field of the Galaxy is assumed, one can compute an actual orbit. A determination of the velocity of the globular clusterωCentauri has recently been completed at Greenwich, and it is found that the orbit is strongly retrograde in the Galaxy. Similar calculations may be made, though with less certainty, in the case of RR Lyrae variable stars.

Distance to SN 1987A and the LMC

1999 ◽  
Vol 190 ◽  
pp. 549-554
Author(s):  
Nino Panagia
Keyword(s):  
Angular Size ◽  
Large Magellanic Cloud ◽  
Magellanic Cloud ◽  
Light Curves ◽  
Distance Modulus ◽  
Absolute Size ◽  
Sn 1987A

Using the new reductions of the IUE light curves by Sonneborn et al. (1997) and an extensive set of HST images of SN 1987A we have repeated and improved Panagia et al. (1991) analysis to obtain a better determination of the distance to the supernova. In this way we have derived an absolute size of the ringRabs= (6.23 ± 0.08) x 1017cm and an angular sizeR″ = 808 ± 17 mas, which give a distance to the supernovad(SN1987A) = 51.4 ± 1.2 kpc and a distance modulusm–M(SN1987A) = 18.55 ± 0.05. Allowing for a displacement of SN 1987A position relative to the LMC center, the distance to the barycenter of the Large Magellanic Cloud is also estimated to bed(LMC) = 52.0±1.3 kpc, which corresponds to a distance modulus ofm–M(LMC) = 18.58±0.05.

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