We present an analysis of hydrogen Balmer line shapes observed in a white dwarf spectrum taken from the SDSS database. The presents lines with triplet structure, featuring presence strong magnetic field. Using fitting model, we estimate effective temperature star and field atmosphere. also electron density Stark broadening calculations.

We re-examine the evidence for the existence of ultra-massive (M > 1.1M⊙) white dwarfs based on gravitational redshift of white dwarfs in common proper motion binaries or in clusters, on parallax measurements, on orbital solutions, and, finally, on the analysis of hydrogen line profiles. We conclude that the best evidence is largely based on the analysis of Balmer line profiles although the com...

A genetic algorithm is developed to find the ridges in paper fingerprints. It is based on the fact that the ridges of the fingerprints are parallel. When scanning the fingerprint, line by line, the ideal noise-free gray level distribution should yield lines of black and white. The widths of these lines are not constant. The proposed genetic algorithm generates black and white lines of different...

In the developed countries, many organizations are regarded a...

While many animals display different colour patterns that signal different messages, some species use various tactics to separate between colour and pattern displays. The common chameleon (Chamaeleo chamaeleon) is capable of rapidly changing and separating among displays of colour patterns and ornaments. We used chameleons to study the contextual role of separation among colour and pattern disp...

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The main purpose of ...