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The phenomenon of the privacy paradox states that people are concerned about their data, but do not behave accordingly by avoiding disclosure of personal data, for instance, when using social media. Since findings about the influence of privacy concerns on privacy-related behavior are controversial, the present study investigates whether social norms or individual privacy concerns provide a better explanation of disclosure behavior. Therefore, a social media app dummy was developed and the social norm manipulated by altering the amount and the sensitivity of information provided in a fictitious app user profile. Regarding social norm factors, the results of the online experiment (N = 42) revealed that only the sensitivity of the data in the dummy profile demonstrated a medium effect on the amount of personal data given by the participants. Considering individual factors, the less concerned individuals were about their privacy, the higher were the amount and the degree of sensitivity of the personal information participants disclosed. In addition, participants differentiated between sensitive or non-sensitive information when disclosing their data. They disclosed sensitive information significantly less often, regardless of the dummy profile they saw. Altogether, the study results do not support the privacy paradox and demonstrate implications for media education.

Zvyšování výkonu parních turbín vede k návrhu nízkotlakých stupňů o velkém průměru, vyznačujících se dlouhými a tenkými lopatkami. Interakce pevných těles s prouděním může způsobit vibrace, které mají za následek sníženou životnost stroje kvůli únavě materiálu. Tato práce představuje matematický model interakce pevného tělesa s tekutinou, navržený za účelem zkoumání vibrací způsobených prouděním. Model je zde aplikován na zjednodušený testovací případ osamoceného profilu leteckého křídla. Model proudění je založen na Eulerových rovnicích v Arbitrary Lagrange-Euler formulaci, diskretizovaných metodou konečných objemů. Jeho validace je provedena prostřednictvím srovnání s experimentálními daty a s numerickými výsledky jiných autorů.

We present an engineering approach to mathematical modeling and numerical solution of 2D inviscid transonic flow of wet steam in a steam turbine cascade channel of penultimate stage at rotor tip section in full Eulerian framework. Our flow model consists of the Euler system for the mixture (dry steam + homogeneously dispersed water droplets) and transport equations for moments of droplet number distribution function known as method of moments. Thermodynamic properties of vapor steam are provided by set of IAPWS equations. For equation of state for vapor phase valid both in superheated and wet (meta-stable) region we adopted recently developed equation in CFD formulation for low pressures provi1ded by Hrubý et al. [9], [8], [10]. For extraction of vapor parameters from the mixture ones we implemented simple relations in polynomial form describing thermodynamic properties of saturated liquid state. Nucleation model is resorting to modified classical nucleation theory. Linear droplet growth model is implemented for calculation of liquid sources. Numerical method is simple: cell-centered finite volume approach, 1st-order AUSM+ scheme for spatial derivatives, symmetrical fractional step method for separation of convection and condensation part, explicit 2-stage 2nd-order Runge-Kutta method for time integration. Geometry of blade profile and experimental results are provided by Bakhtar’s work [22], [23]. Results were obtained for one subsonic inlet/subsonic outlet regime and gave quite reasonable accordance with experiment.