Wyniki wyszukiwania - BazTech

1

Digital volume correlation in an environment with intensive salt-and-pepper noise and strong monotonic nonlinear distortion of light intensity

Tu P., Bai Y., Xu W., Dong B., Ye S., Yang Q., Zhou Y.

Optica Applicata

|

2017

|

Vol. 47, nr 2

209--223

EN

Digital volume correlation is an image-based technique for internal 3D displacement and strain fields measurement or analysis widely used in the field of experimental mechanics. A widely used correlation function (criterion) of digital volume correlation is Pearson correlation function, which suffers from the problem of the acquired data being contaminated by salt-and-pepper noise and monotonic nonlinear distortion of the light intensity. In this work, a 3D correlation function called the Spearman correlation function is used to deal with those interferences. A numerical experiment shows that the performance of Spearman correlation function using integer-pixel registration in an environment with 10% salt-and-pepper noise is better than that of Spearman and Pearson correlation functions using sub-pixel registration in an environment with 1% salt-and-pepper noise. As the light intensity distortion is significant, the error of Pearson correlation function is considerable; meanwhile, the error of Spearman correlation function is small. In conclusion, Spearman correlation function is, in particular, practical and useful in digital volume correlation.

2

Investigation of photo-physical properties of selected diaminoacid protoporphyrin derivatives (PP(AA)2Arg2). II. Determination of quantum yield of singlet oxygen FD

Ye S., Kwaśny M., Czuba M., Graczyk A.

Optica Applicata

|

2003

|

Vol. 33, nr 2-3

505-519

EN

A new generation of photosensitizers for photodynamic therapy (PDT) has been investigated. Different amino acids were bound to protoporphyrin (PP). Two methods of determination the quantum yield of generated singlet oxygen in porphyrin solutions were investigated. In the first method, tryptophan was used as a singlet oxygen acceptor. In the second one, the amount of singlet oxygen was determined by phosphorescence at 1272 nm. The purpose of this work was to evaluate the quantum yield of singlet oxygen of different PP(AA)2Arg2 derivatives, since it is crucial for choosing proper ingredients of photosensitizer for diagnosis and therapy in PDT

3

Investigation of photo-physical properties of selected diaminoacid protoporphyrin derivatives (PP(AA)2Arg2). I. Determination of quantum yield of fluorescence

Ye S., Czuba M., Romiszewska A., Karolczak J., Graczyk A.

Optica Applicata

|

2003

|

Vol. 33, nr 2-3

489-503

EN

An new generation of photosensitizers for photodynamic therapy (PDT) has been investigated. Different amino acids (Ala, Ser, Thr, Phe and Trp) were bound to protoporphyrin (PP). The quantum yield of fluorescence of porphyrin solutions was investigated. Fluorescence spectra and lifetimes of excited porphyrins were determined, too. The purpose of this work was to evaluate the quantum yield of fluorescence of different PP(AA)2Arg2 derivatives, since it is crucial for choosing proper ingredients of photosensitizer for diagnosis and therapy in PDT