In reference to Anna Śliz’s book Wielokulturowość: stygmat współczesnego świata? Próba analizy socjologicznej [Multiculturalism: The Stigma of the Modern World? An Attempt at a Sociological Analysis], the subject of this article is multiculturalism as a phenomenon, a political project, and a real kind of existing society (multiculturalism is not the same as interculturalism or transculturalism). In the discourse on multiculturalism, many specific questions arise: the inevitability of the phenomenon and its genesis; the beginnings and bases of multiculturalism as a political project and its challenges; the reality of multicultural societies—from affirmation to contestation. Model discourse over multiculturalism is confronted with a range of remarks, commentaries, and questions about its fundamental significance, for example, about the potential for realizing the idea of multiculturalism in Europe, and whether Australia and Canada are now definitely multicultural societies.

This paper explores the influence of linear gear tip relief modification on power transmission efficiency. In real time applications gears experience transmission error (TE) during operation which increases noise and vibration and also results in increased tooth profile deformation during operation of the gear. By providing tip relief profile modification this TE can be decreased. Using MATLAB for computation and ANSYS for the simulation of deformation, stress, strain, life, and factor of safety results for the gear assemblies are obtained. Deformation results are used for the computation change in power transmission efficiency followed by the modal and harmonic analysis of the gears and gear assemblies to determine change in the first mode of natural frequency.

We describe construction and investigation results of optical trace gas sensor working in the 3.334–3.337 μm spectral range. Laser spectroscopy was performed with a multipass cell. A setup was elaborated for detection of ethane at the 3.3368035 μm absorption line. Analysis of the gas spectra and the experiment have shown that, beside C2H6, the sensor is suitable for simultaneous detection of methane, formaldehyde and water vapor. Due to nonlinearity of the laser power characteristic we decided to detect the fourth harmonic of signal. Additional laser wavelength modulation was applied for optical interference suppression. In result, the precision of ethane detection of approximately 80 ppt has been achieved for the averaging time of 20 seconds. Long-term stability as well as the measurement linearity have also been positively tested. The system is suitable for detecting potential biomarkers directly in human breath.