Radar studies of the vertical distribution of insects migrating over southern Britain: the influence of temperature inversions on nocturnal layer concentrations

Insects migrating over two sites in southern UK (Malvern in Worcestershire, and Harpenden in Hertfordshire) have been monitored continuously with nutating vertical-looking radars (VLRs) equipped with powerful control and analysis software. These observations make possible, for the first time, a systematic investigation of the vertical distribution of insect aerial density in the atmosphere, over temporal scales ranging from the short (instantaneous vertical profiles updated every 15 min) to the very long (profiles aggregated over whole seasons or even years). In the present paper, an outline is given of some general features of insect stratification as revealed by the radars, followed by a description of occasions during warm nights in the summer months when intense insect layers developed. Some of these nocturnal layers were due to the insects flying preferentially at the top of strong surface temperature inversions, and in other cases, layering was associated with higher-altitude temperature maxima, such as those due to subsidence inversions. The layers were formed from insects of a great variety of sizes, but peaks in the mass distributions pointed to a preponderance of medium-sized noctuid moths on certain occasions

Cosmic censorship of smooth structures

It is observed that on many 4-manifolds there is a unique smooth structure underlying a globally hyperbolic Lorentz metric. For instance, every contractible smooth 4-manifold admitting a globally hyperbolic Lorentz metric is diffeomorphic to the standard $\R^4$. Similarly, a smooth 4-manifold homeomorphic to the product of a closed oriented 3-manifold $N$ and $\R$ and admitting a globally hyperbolic Lorentz metric is in fact diffeomorphic to $N\times \R$. Thus one may speak of a censorship imposed by the global hyperbolicty assumption on the possible smooth structures on $(3+1)$-dimensional spacetimes.Comment: 5 pages; V.2 - title changed, minor edits, references adde

The Female Experience of Epidemics in the Early Modern Low Countries

Recent literature has argued that women in parts of the early modern Low Countries experienced high levels of ‘agency’ and ‘independence’ – measured through ages and rates of marriage, participation in economic activities beyond the household, and the physical occupation of collective or public spaces. Epidemic disease outbreaks, however, also help bring into focus a number of female burdens and hardships in the early modern Low Countries, possibly born out of structural inequalities and vulnerabilities obscured from view in ‘normal times’, and which is supported by recent demographic research showing heightened adult female mortality compared to male during epidemics. For women, these included expectations of care both inside and outside the familial household, different forms of persecution, and social controls via authorities from above and internal regulation within communities from below – though these were also restrictions that women of course did not always passively accept, and sometimes violently rejected

Block-Transitive Designs in Affine Spaces

This paper deals with block-transitive $t$-$(v,k,\lambda)$ designs in affine spaces for large $t$, with a focus on the important index $\lambda=1$ case. We prove that there are no non-trivial 5-$(v,k,1)$ designs admitting a block-transitive group of automorphisms that is of affine type. Moreover, we show that the corresponding non-existence result holds for 4-$(v,k,1)$ designs, except possibly when the group is one-dimensional affine. Our approach involves a consideration of the finite 2-homogeneous affine permutation groups.Comment: 10 pages; to appear in: "Designs, Codes and Cryptography

Social Responses to Epidemics Depicted by Cinema

Films illustrate 2 ways that epidemics can affect societies: fear leading to a breakdown in sociability and fear stimulating preservation of tightly held social norms. The first response is often informed by concern over perceived moral failings within society, the second response by the application of arbitrary or excessive controls from outside the community

Review of Ronsijn, W. (2014) Commerce and the Countryside: The Rural Population’s Involvement in the Commodity Market in Flanders, 1750-1910

Collective identities and transnational networks in medieval and early modern Europe, 1000-180

Better Understanding Disasters by Better Using History

This paper argues that the understanding of causes and effects of hazards and shocks could be furthered by making more explicit and systematic use of the historical record, that is, by using ‘the past’ as a laboratory to test hypotheses in a careful way. History lends itself towards this end because of the opportunity it offers to identify distinct and divergent social structures existing very close to one another on a regional level and the possibility this creates of making comparisons between societal responses to shocks spatially and chronologically. Furthermore, the basic richness of the historical record itself enables us to make a long-term reconstruction of the social, economic and cultural impact of hazards and shocks simply not possible in contemporary disaster studies material

Tine De Moor’s ‘Silent Revolution’. Reconsider her Theoretical Framework for Explaining the Emergence of Institutions for the Collective Management of Resources

Tine De Moor has developed a bold and robust scholarly framework for explaining the emergence of institutions for 'corporate collective action' in her 'Silent Revolution' article of 2008; the significance of which may serve to be the foundation of a research agenda on the commons for years to come. However, as revealed in this review piece, there are some fundamental flaws in the framework, which need to be ironed out first. There remains a problem with causality – in particular, no logical connection in the framework between the 'conditions necessary to make collective action possible' and the 'reasons to opt for collective action'. In summary, this review suggests De Moor's framework is an important step forward for those researching the commons, though it needs to be modified to become more receptive to the socio-political configurations that gave each pre-industrial society its character

The Sex-Selective Impact of the Black Death and Recurring Plagues in the Southern Netherlands, 1349-1450

Although recent work has begun to establish that early modern plagues had selective mortality effects, it was generally accepted that the initial outbreak of Black Death in 1347-52 was a ‘universal killer’. Recent bioarchaeological work, however, has argued that the Black Death was also selective with regard to age and pre-plague health status. The issue of the Black Death’s potential sex selectivity is less clear. Bioarchaeological research hypothesizes that sex-selection in mortality was possible during the initial Black Death outbreak, and we present evidence from historical sources to test this notion.Collective identities and transnational networks in medieval and early modern Europe, 1000-180

History and the Social Sciences

Since the turn of the Millennium, major changes in economic history practice such as the dominance of econometrics and the championing of “big data,” as well as changes in how research is funded, have created new pressures for medieval economic historians to confront. In this article, it is suggested that one way of strengthening the field further is to more explicitly link up with hypotheses posed in other social sciences. The historical record is one “laboratory” in which hypotheses developed by sociologists, economists, and even natural scientists can be explicitly tested, especially using dual forms of geographical and chronological comparison. As one example to demonstrate this, a case is made for the stimulating effect of “disaster studies.” Historians have failed to interact with ideas from disaster studies, not only because of the general drift away from the social sciences by the historical discipline, but also because of a twin conception that medieval disaster study bears no relation to the modern