Propagation of Controlled Frontward Impulses Through Standing Crowds

Impulse propagation in crowds is a phenomenon that is crucial for understanding collective dynamics, but has been scarcely addressed so far. Therefore, we have carried out experiments in which persons standing in a crowd are pushed forward in a controlled manner.Variations of experimental parameters include (i) the intensity of the push, (ii) the initial inter-person distance, (iii) the preparedness of participants and (iv) the crowd formation. Our analysis links the intensity of an impulse recorded by a pressure sensor with individual movements of participants based on head trajectories recorded by overhead cameras and 3D motion capturing data. The propagation distance as well as the propagation speed of the external impact depends mainly on the intensity of the impulse, whereas no significant effect regarding the preparedness of participants could be found. Especially the propagation speed is influenced by the initial inter-person distance. From the comparison between two methods that detect the time of motion due to the impulse, a more sensitive result is obtained when the velocity of three landmarks of the human body is taken into account and not only the forward displacement of the center of mass. Furthermore, the more intertwined participants are in relation to each other, the more the impulse is distributed to the sides. As a result, more people are affected, however with smaller individual displacements

Crowding and Queuing in Entrance Scenarios: Influence of Corridor Width in Front of Bottlenecks

In this paper, we present results of an entrance experiment investigating the effect of the corridor width in front of a bottleneck on the density. The idea is based on a previous study suggesting that a guiding system in front of an entrance can reduce pushing of the waiting people and thus the density at the entrance. In our study we aim to find out to what extend the corridor width has an impact on crowding or queuing behavior and with that on the density. The results of the presented experiment suggest that the transition takes place between a corridor width of 1.2 m and 2.3 m. The total duration of each experimental run is not significantly influenced by the corridor width but by the width of the entrance itself, the number of participants and partly by the motivation. In general, the density in front of the gate as well as the area of high density is increased by widening the corridor and by intensifying the motivation of the participants. However, the results also suggest that also the number of participants significantly influences the occurrence of pushing and the level of density

State of the Art Report

This paper illustrates the research questions, the main underlying concepts and the relevant literature of the EUCROSS project. The project examines the relationship between the manifold activities of EU residents (nationals, mobile EU citizens, and thirdcountry nationals) across the borders of nation states and their collective identities. Specifically, the project intends to: 1) map out individuals’ cross-border practices as an effect of European integration and globalisation; 2) assess the impact of these practices on collective identifications (also controlling for the inverse causal process). Which cross-border practices are more likely to foster some form of identification with the EU – e.g., contacts with foreign friends and/or unwanted foreigners, periods of labour mobility abroad, business and tourist travel, or consumer relations with international companies? Under which contextual and individual conditions do these experiences promote a higher sensitivity to ‘Europe’ – rather than the ‘local’ or the ‘global’ – as an identity catalyst? Which social groups are more prone to adopt a European mindset in the wake of the Europeanisation of everyday life? In addressing these questions, we use the concepts of ‘Europeanisation’, ‘European identity’, ‘cross-border practices’ and ‘cosmopolitanism’ drawing on and elaborating from their meaning in the contemporary social science literature – and especially in sociology, anthropology, political science and social psychology. Overall, we find that seldom are these concepts treated altogether specifying the link between spatially and culturally situated behaviours on the one hand and collective identifications and value orientations on the other. Moreover, few studies examine socio-cultural Europeanisation and supernational identifications comparatively, and none includes simultaneously native and immigrant populations, who in fact may attest of different modalities in which the behaviour-identity link can take place

Global supply chains and social relations at work: Brokering across boundaries

© 2018, © The Author(s) 2018. Global supply chains are not just instruments for the exchange of economic goods and flow of capital across borders. They also connect people in unprecedented ways across social and cultural boundaries and have created new, interrelated webs of social relationships that are socially embedded. However, most of the existing theories of work are mainly based at the level of the corporation, not on the network of relations that interlink them, and how this may impact on work and employment relations. We argue that this web of relations should not just be seen in economic, but also social terms, and that the former are embedded and enabled by the latter. This article argues for the value of focusing on the role of brokers and boundary workers in mediating social relat ions across global supply chains. It develops four approaches that lie on a spectrum from structural perspectives focused on brokers who link otherwise unconnected actors to more constructivist ones focused on boundary workers performing translation work between domains

The Europeanisation of Everyday Life: Cross-Border Practices and Transnational Identifications Among EU and Third-Country Citizens State of the Art Report

This paper illustrates the research questions, the main underlying concepts and the relevant literature of the EUCROSS project. It reports on the existing literature in sociology, anthropology, political sciences and social psychology related to the project which seeks to examine the relationship between the manifold activities of EU residents (nationals, mobile EU citizens, and third country nationals) across the borders of nation states and their collective identities. It raises questions about 1) how to map out individuals’ cross-border practices as an effect of European integration and globalisation; and 2) assess the impact of these practices on collective identifications, while also controlling for the inverse causal process. Which cross-border practices are more likely to foster some form of identification with the EU – e.g., contacts with foreign friends and/or unwanted foreigners, periods of labour mobility abroad, business and tourist travel, or consumer relations with international companies? Under which contextual and individual conditions do these experiences promote a higher sensitivity to ‘Europe’ – rather than the ‘local’ or the ‘global’ – as an identity catalyst? Which social groups are more likely to adopt a European mindset in the wake of the Europeanisation of everyday life? While substantial separate literatures about ‘Europeanisation’, ‘European identity’, ‘cross-border practices’ and ‘cosmopolitanism’ can be found, we argue that seldom are these concepts treated altogether to specify the link between spatially and culturally situated behaviours on the one hand and collective identifications and value orientations on the other. Moreover, few studies examine socio-cultural Europeanisation and supernational identifications comparatively, and none include simultaneously native and immigrant populations, who in fact may attest of different modalities in which the behaviour-identity link can take place

Rethinking Hereditary Relations: The Reconstitutor as the Evolutionary Unit of Heredity

This paper introduces the reconstitutor as a comprehensive unit of heredity within the context of evolutionary research. A reconstitutor is the structure resulting from a set of relationships between different elements or processes that are actively involved in the recreation of a specific phenotypic variant in each generation regardless of the biomolecular basis of the elements or whether they stand in a continuous line of ancestry. Firstly, we justify the necessity of introducing the reconstitutor by showing the limitations of other evolutionary conceptions of the unit of heredity, such as the replicator, the reproducer, and the Darwinian individual. We argue that these conceptions are based on the requirement of lineage formation (Stability of Lineages), which we argue to be unnecessary for the existence of evolutionary heredity. In the second part, we introduce the reconstitutor, which we base on the concept of Stability of Traits, and illustrate how it covers cases of hereditary phenomena (small RNAs, microbiota) not covered by the previous accounts. Secondly, we illustrate how the reconstitutor could serve as a platform to rethink ecological inheritance and other forms of inheritance that have been recently introduced under the song/singer model of evolution

Assessment of the immune capacity of mammary epithelial cells: comparison with mammary tissue after challenge with Escherichia coli

We examined the repertoire and extent of inflammation dependent gene regulation in a bovine mammary epithelial cell (MEC) model, to better understand the contribution of the MEC in the immune defence of the udder. We challenged primary cultures of MEC from cows with heat inactivated Escherichia coli pathogens and used Affymetrix DNA-microarrays to profile challenge related alterations in their transcriptome. Compared to acute mastitis, the most prominently activated genes comprise those encoding chemokines, interleukins, beta-defensins, serum amyloid A and haptoglobin. Hence, the MEC exert sentinel as well as effector functions of innate immune defence. E. coli stimulated a larger fraction of genes (30%) in the MEC belonging to the functional category Inflammatory Response than we recorded with the same microarrays during acute mastitis in the udder (17%). This observation underscores the exquisite immune capacity of MEC. To more closely examine the adequacy of immunological regulation in MEC, we compared the inflammation dependent regulation of factors contributing to the complement system between the udder versus the MEC. In the MEC we observed only up regulation of several complement factor-encoding genes. Mastitis, in contrast, in the udder strongly down regulates such genes encoding factors contributing to both, the classical pathway of complement activation and the Membrane Attack Complex, while the expression of factors contributing to the alternative pathway may be enhanced. This functionally polarized regulation of the complex complement pathway is not reflected in the MEC models

Wicked facets of the German energy transition – examples from the electricity, heating, transport, and industry sectors

We shed light on wicked problems in the German energy transition. Our methods consist of a multiple-case study and multi-criteria analysis, utilising the wicked problems theoretical framework introduced by Horst Rittel and Melvin Webber [1973. “Dilemmas in a General Theory of Planning.” Policy Sciences 4 (2): 155–169. Accessed August 20, 2019. https://doi.org/10.1007/BF01405730]. Results from the energy supply, heating/cooling, transport, and industry sectors illustrate where and how the 10-point frame of wicked problems manifests in the German energy transition. The four cases exhibit more wicked tendencies in the governance domain than the technical domain and differ in their degrees of technology maturity, policy regulation, and knowledge states. We do not find that the German energy transition is inherently wicked. However, wickedness unfolds through the social setting into which technical solutions of the energy transition are embedded. We aim to highlight these intricacies and encourage scrutinising these wicked facets early on

A local-to-large scale view of Maritime Continent rainfall: control by ENSO, MJO, and equatorial waves

The canonical view of the Maritime Continent (MC) diurnal cycle is deep convection occurring over land during the afternoon and evening, tending to propagate offshore overnight. However, there is considerable day-to-day variability in the convection, and the mechanism of the offshore propagation is not well understood. We test the hypothesis that large-scale drivers such as ENSO, the MJO, and equatorial waves, through their modification of the local circulation, can modify the direction or strength of the propagation, or prevent the deep convection from triggering in the first place. Taking a local-to-large scale approach, we use in situ observations, satellite data, and reanalyses for five MC coastal regions, and show that the occurrence of the diurnal convection and its offshore propagation is closely tied to coastal wind regimes that we define using the k-means cluster algorithm. Strong prevailing onshore winds are associated with a suppressed diurnal cycle of precipitation, while prevailing offshore winds are associated with an active diurnal cycle, offshore propagation of convection, and a greater risk of extreme rainfall. ENSO, the MJO, equatorial Rossby waves, and westward mixed Rossby–gravity waves have varying levels of control over which coastal wind regime occurs, and therefore on precipitation, depending on the MC coastline in question. The large-scale drivers associated with dry and wet regimes are summarized for each location as a reference for forecasters