What bird is singing?

The goal of this work was to create a model for characterizing bird species through recordings of their song. A large set of twenty species with 10+ recordings in each species was considered and the algorithm used time-frequency models for the characterization. Three different approaches were used in an attempt to build the foundations for the final model in a bottom to top manner. The resulting model divided birdsong into syllables that were analyzed and compared in several time-frequency domains in order to characterize the species. The domains include the Spectrogram, the Doppler domain and the Ambiguity domain. The result varied depending on the complexity of the song and the quality of the recordings but for simple songs with recordings of good quality the results were very good

Secular and religious volunteering among immigrants and natives in Denmark

During the last 20–30 years Western societies have witnessed large scale migration from the Global South. This has given rise to important challenges in securing the social, civic and political integration of non-Western immigrants into Western societies. Previous research has suggested that participation in volunteering in civil society can serve as a ‘stepping stone’ towards integration for immigrants. Whilst the previous studies have shown marked gaps in the propensity to participate in volunteering between immigrants and natives, little work has been done to identify the mechanisms that explain these gaps. In this study, high-quality survey data, linked with data from administrative registers, are used, with the application of logistic regression based on the Karlson–Holm–Breen method to conduct mediation analysis. The mediation analysis shows that non-Western immigrants are significantly less likely to participate in secular volunteering compared to natives; however, over half of this gap is explained by an indirect effect via socio-economic status, self-rated health, generalized trust, informal social networks and the intergenerational transmission of volunteering. Moreover, the mediation analysis suggests that non-Western immigrants are more likely to participate in religious volunteering: this is completely explained by a strong indirect effect occurring via religiosity. </jats:p