University of Konstanz
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Explaining Public Sector Corruption: The Hexagon Model
No full textDifferent disciplines ask why public sector corruption occurs, addressing diverse phenomena. However, how different approaches and factors at micro, meso, or macro levels relate to each other in causally complex, context‐dependent ways is seldom theorized. This article develops an integrated “Corruption Hexagon” model with six dimensions. The analytically relevant context provides a not directly causal background that influences the interplay of the pressure to act corruptly, the opportunity to benefit from corruption, the capability to exploit the opportunity, the supply of corruption, and the rationalization of one's corrupt behavior. Using secondary data from 23 European countries, we operationalize the Hexagon to explain differences in procurement‐related corruption risks. Results corroborate the Hexagon's expectations: whereas the circumstances enable corruption, their interplay with personal characteristics or rationalization triggers corruption. The Hexagon offers a flexible, context‐dependent, complexity‐informed model for cumulative research integrating different methods and theoretical assumptions about the agency underlying corruption.publishe
Fluoreszenzmikroskopische Untersuchung der Translations- und Rotationsdynamik dispergierter Kolloide
No full textpublishe
Consistency and individuality of honeybee stinging behaviour across time and social contexts
No full textWhether individuals exhibit consistent behavioural variation is a central question in the field of animal behaviour. This question is particularly interesting in the case of social animals, as their behaviour may be strongly modulated by the collective. In this study, we ask whether honeybees exhibit individual differences in stinging behaviour. We demonstrate that bees are relatively stable in their decision to sting—or not—in a specific context and show temporal consistency suggestive of an internal state modulation. We also investigated how social factors such as the alarm pheromone or another bee modulated this behaviour. The presence of alarm pheromone increased the likelihood of a bee to sting but this response decayed over trials, while the presence of a conspecific decreased individual stinging likelihood. These factors, however, did not alter stinging consistency. We therefore propose that social modulation acts by shifting the stinging threshold of individuals. Finally, experimental manipulation of group composition with respect to the ratio of aggressive and gentle bees within a group did not affect the behaviour of focal bees. Overall, our results establish honeybee stinging behaviour as a promising model for studying mechanistically how collective and individual traits interact to regulate individual variability.publishe
Affective, cognitive, and contextual cues in Reddit posts on artificial intelligence
No full textArtificially intelligent technologies have become a common topic in our everyday discussions where arguments about the subject can take different forms from cognitive reasoning to emotional expressions. Utilizing persuasion theories and research on the appeal of content characteristics as the theoretical approach to examine affective–cognitive language, we investigated social media posts on artificial intelligence (AI). We examined Reddit posts from 2005 to 2018 referring to AI (N = 455,634) using automated content analysis tools. The results revealed that although both the tone positivity and affective–cognitive ratio were dependent on the specific context, the language in AI posts was more analytically than emotionally oriented in general. Other users were more likely to engage with Reddit posts on AI that were high in cognitive and analytic content compared to affective and emotional content. In addition to the practical contribution of public opinion on AI, the results contribute to the theoretical discussions on affective and cognitive language in social media discussions.publishe
Female budgerigars prefer males with foraging skills that differ from their own
No full textForaging skills influence food intake and could therefore also play a role in mate choice decision. Previous empirical work has shown that individuals benefit from being in groups that include individuals with a variety of foraging skills as this increases foraging success. This idea, formalized in the skill-pool hypothesis, may extend to mate choice. Diverse foraging skills can expand the foraging niche of a pair and benefit offspring through enhanced parental provisioning, and exposure to a broader foraging skillset. To test this idea, we trained captive female and male budgerigars to solve one of two different novel foraging puzzle boxes. Then, females simultaneously observed two males that could solve either the same or the other box, and assessed female preferences in a binary mate choice apparatus. Females preferred males with foraging skills that differed from their own, independent of the skill type and the number of times males solved the foraging puzzle. These findings show that foraging skills can influence social preferences, including in a mate choice context, and support intraspecific diversity in foraging skills.publishe
High Molecular Conductance and Inverted Conductance Decay over 3 nm in Aminium-Terminated Carbon-Bridged Oligophenylene-Vinylenes
No full textWith the progressing miniaturization of electronic device components to improve circuit density while retaining or even reducing spatial requirements, single molecules employed as electric components define the lower limit of accessible structural width. To circumvent the typical exponential conductance decay for increasing length in molecule-based wires, topological states, which describe the occurrence of discontinuities of a bulk material’s electronic structure confined to its surface, can be realized for molecules by the introduction of unpaired spins at the molecular termini. The resulting high conductance and reversed conductance decay are typically only observed for shorter molecules, as the terminal spins must be within the electronic coupling range to produce the desired effects. We expand the realm of long and exceptionally conductive molecular wires by employing highly conjugated, planarized carbon-bridged oligo(phenylene-vinylene)s as conduits between readily oxidizable diarylamine termini. This yields molecular wires of already decent conductance values and small conductance decay in the neutral state. Upon the introduction of topological states, the conductance can be increased by a factor of up to 1800 for a 3 nm long molecule, and the conductance decay becomes inverted, together with an excellent signal intensity at concentrations as low as 0.01 mM.publishe
Eoldist, a Web Application for Estimating Cautionary Detection Distance of Birds by Automatic Detection Systems to Reduce Collisions With Wind Turbines
No full textThe installation of automatic detection systems (ADSs) on operating wind energy facilities is a mitigation measure to reduce bird collisions. The effectiveness of an ADS depends on a combination of parameters, including the detection distance of the bird, its flight speed, and the time to complete the chosen action (e.g., turbine shutdown). We created a web application, Eoldist , to calculate cautionary detection distances required by an ADS, using bird flight speed and turbine shutdown time as input parameters. We compiled a database of the flight speeds of 168 Western Palearctic birds from a review of scientific literature supplemented by an analysis of unpublished GPS‐tracking datasets. To estimate turbine shutdown time, we conducted 137 field trials of experimental shutdown at seven wind farms and found that the duration to reach residual rotor speeds of 3 or 2 rotations per minute (rpm) was respectively 32.2 or 38.8 s on average. Based on this data, Eoldist allows the user to select a species from the database, wind turbine characteristics, and a residual rotor speed (3 or 2 rpm); it then calculates the time to reach the selected threshold and provides a distribution curve for the cautionary detection distance needed to prevent collision. This article includes examples of cautionary detection distances required for several species to demonstrate the sensitivity of key input parameters. Eoldist is freely available and should help the wind energy industry, ADS suppliers, and environmental agencies to define requirements for ADS bird detection that are compatible with the biology of the target species.publishe
