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Bucharest, Romania

Daito I.,Kyoto University | Ohgaki H.,Kyoto University | Suliman G.,Horia Hulubei National Institute of Physics and Nuclear Engineering | Iancu V.,Horia Hulubei National Institute of Physics and Nuclear Engineering | And 2 more authors.
Energy Procedia | Year: 2016

Non-destructive inspection carried out by using nuclear resonances excited by an MeV energy region gamma ray is a promising method. The high penetrability of MeV gamma ray of nuclear resonant energy makes possible the detection of nuclides surrounded by massive materials. As an application of this method, computed tomography imaging of nuclear distribution inside objects can be reconstructed from transmission factor of gamma rays. We have studied the image reconstruction of the nuclear distribution using Monte-Carlo simulations to estimate the gamma-ray transmission factor assuming the ELI-NP facility where about 3 order higher intensity of quasi-monoenergetic gamma rays will be available. © 2016 The Authors.

Ponomarev M.G.,Brunel University | Kappatos V.,Brunel University | Selcuk C.,Brunel University | Gan T.-H.,Brunel University | And 4 more authors.
Powder Metallurgy | Year: 2013

The ability of radiography data processing algorithms for detection and segmentation of cloud-like discontinuities and cracks in both green and sintered PM parts has been demonstrated. A Volterra kernel series can be considered as an analytic description for radiography imaging, which relates the ideal image G(x,y) and the sensed image F(x,y) using some operator. The sensor gives the image F(x,y), which is connected with the ideal image G. The extraction of an image that is as close as possible to the ideal image occurs during the preprocessing stage. Thresholds can be determined from pixel intensity histogram analyses by determining the valley points that can serve as thresholds. Another set of radiography images may require another approach such as the Laplacian technique. After confirming the ability of the algorithms to obtain defect segmentation, the next step will be to build a database of defects. The best approach is likely to be to use representation in moment space.

Emandi I.,University of Bucharest | Iovea M.,Accent Pro 2000 Ltd. | Duliu O.G.,University of Bucharest | Emandi A.,University of Bucharest
International Journal of Conservation Science | Year: 2011

Nondestructive investigation methods with penetrating radiations, such as digital radiography and computed tomography proved to be very useful not only in assessing the cultural heritage, but also but also in any restoration and conservation activity by supplying a multitude of micro-structural details regarding a great diversity of works of art. Consequently, present paper presents two case studies regarding the use of digital radiography in investigating panel icons from the Popa Tatu Church, Bucharest. In both cases it was possible to evidence not only the actual state of conservation of wooden panels but also fragments of the oil picture, allowing a better planning of the future conservation work.

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Copyright 2000 - 2014 Accent Pro 2000

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