The article presents a survey of selected methods for phase evaluation of optical wave fields based on interference principle. There are mentioned both the classical and modern interferometric methods for phase evaluation usable in many applications, especially in scientific and industrial optical metrology. Their advantage is a high precision, non-contact way of measurement and results obtained practically in real time. and V článku je podán přehled vybraných metod vyhodnocování fáze optického vlnového pole, které jsou založeny na interferenčním principu. Jsou zde zmíněny jak klasické, tak i moderní interferometrické metody vyhodnocování fáze, jež se dají prakticky využít v mnoha aplikacích, zejména pak v oblasti optické metrologie ve vědě a průmyslu. Výhodou těchto metod je jejich vysoká přesnost, možnost realizovat bezkontaktní způsob měření v různých aplikacích a provádění vyhodnocení prakticky v reálném čase.
The steady stagnation-point flow of an electrically conducting fluid due to convectively heated stretched disk in the radial direction is considered. Effects of viscous dissipation and Joule heating are present. Mathematical modelling is based upon constitutive relations of Jeffrey fluid. The governing partial differential equations are first transformed into the coupled system of ordinary differential equations and then solved for the convergent series solutions. Numerical values of skin friction coefficient and local Nusselt number are also computed and analysed.
Dinemoura discrepans Cressey, 1967 (Copepoda, Siphonostomatoida, Pandaridae) is redescribed based on the specimens taken from four species of sharks caught off the southeast coast of Taiwan. The four species of sharks are: pelagic thresher, Alopias pelagicus Nakamura; bigeye thresher, A. superciliosus Lowe; blacktip shark, Carcharhinus limbatus (Müller et Henle); and oceanic whitetip shark, C. longimanus (Poey). Although our redescription shows certain differences from the original description, after re-examination of the museum specimens studied by R. F. Cressey in making the original description, it was confirmed that the specimens from off Taiwan are identifiable with D. discrepans. Carcharhinus limbatus is currently known to host 19 species of parasitic copepods, of which D. discrepans is the first one of this copepod genus.