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Designing engineering components that make optimal use of materials requires consideration of the nonlinear static and dynamic characteristics associated with both manufacturing and working environments. The modeling of these characteristics can only be done through numerical formulation and simulation, which requires an understanding of the theoretical background and associated computer solution techniques. By presenting nonlinear solid mechanics, dynamic conservation laws and principles, and the associated finite element techniques together, the authors provide a unified treatment of the dynamic simulation of nonlinear solids. Alongside numerous worked examples and exercises are user instructions, program descriptions, and examples for two MATLAB computer implementations with source code available online. While this book is designed to complement postgraduate courses, it is also relevant to industry professionals requiring an appreciation of the way their computer simulation programs work.
Neurophysiological patterns may distinguish which youth are at risk for the well-documented increase in internalizing symptoms during adolescence. Adolescents with internalizing problems exhibit altered resting-state functional connectivity (RSFC) of brain regions involved in socio-affective processing. Whether connectivity-based biotypes differentiate adolescents’ levels of internalizing problems remains unknown.
Sixty-eight adolescents (37 females) reported on their internalizing problems at ages 14, 16, and 18 years. A resting-state functional neuroimaging scan was collected at age 16. Time-series data of 15 internalizing-relevant brain regions were entered into the Subgroup-Group Iterative Multi-Model Estimation program to identify subgroups based on RSFC maps. Associations between internalizing problems and connectivity-based biotypes were tested with regression analyses.
Two connectivity-based biotypes were found: a Diffusely-connected biotype (N = 46), with long-range fronto-parietal paths, and a Hyper-connected biotype (N = 22), with paths between subcortical and medial frontal areas (e.g. affective and default-mode network regions). Higher levels of past (age 14) internalizing problems predicted a greater likelihood of belonging to the Hyper-connected biotype at age 16. The Hyper-connected biotype showed higher levels of concurrent problems (age 16) and future (age 18) internalizing problems.
Differential patterns of RSFC among socio-affective brain regions were predicted by earlier internalizing problems and predicted future internalizing problems in adolescence. Measuring connectivity-based biotypes in adolescence may offer insight into which youth face an elevated risk for internalizing disorders during this critical developmental period.
In light of the recognition of the Anthropocene – a geological epoch of our own making – this chapter asks how well anthropology is equipped to deal with the challenge that the recognition of human geological agency presents to our time perspectives. It offers two theoretical starting points to initiate the conversation between anthropological theory and the history of the encounter with deep time within Britain: the anthropologist E.E. Evans-Pritchard and the geologist James Hutton. This discussion introduces three key questions for an anthropology of deep time: what is the relationship between human rhythms and the rhythms of the more-than-human world within which humans live? What is the significance of our time horizons, their proximity or distance? And whose time is deep time?
This chapter explores the particular significance of the present, and the ways in which anthropology has approached ‘presentism’ as a metaphysical claim, a sociological description, and a means of analysis. While recognising that an analysis of the conditions of presentism is crucial for understanding contemporary social life, the central argument here is that any attempt to embrace presentism as a methodological tool or even metaphysical truth risks distorting human activity in a disastrous way by abstracting it from the material environment that makes such activity possible. The chapter concludes with a reflection upon the relationship between time and mystification in order to understand temporal disjuncture: conditions of life which obscure – and at the same time are violently dissonant with – the temporality of the ecologies and geologies which make that life possible. The task for anthropology is to analyse the conditions of this extraction from deep time, not to replicate it.
What underlies the English rural idyll? This chapter explores the relationship between stratigraphy, economy, and sense of place, taking as its primary focus the chalk hills of South Cambridgeshire, the ‘great croprolite boom’, and the significance of cement production. Yet in exploring the way in which social and economic change delves into geological history, it challenges chronotopes that emphasise continuity and consonance within the landscape, focussing our attention instead on temporal disjuncture, displacement, and a geology in motion.
Ground that was once the floor of the sea; sea rising up and snatching away ground. Folding hills, coastlines shaped and reshaped. There is nothing static about the terrain upon which we live and on which we depend.
This book seeks to understand human life in relation to these deep-time movements. It sets out to explore the way in which social rhythms interact with ecological and geological rhythms. Yet in the course of such a task, dislocations become apparent – the tension between the short-term orientation of contemporary life and the vast span of the physical processes on which that present draws. What are the horizons of a society’s sense of time? This is a question of enormous significance for anthropological analysis, as I intend to show.
Recognising that our maps of deep time are themselves products of the entangled relationship between the biographical and the geological, this chapter takes inspiration from the ‘biographical geology’ of the Scottish stonemason and geologist Hugh Miller. Turning our ethnographic focus to the Orkney Islands, where Miller hunted for fish fossils within the Old Red Sandstone, this chapter considers the ways in which deep time protrudes into the present. In particular, we consider the dynamics of erosion (and the role of concrete defences in holding the line against erosion) and the impact of the discovery of geological resources – particularly oil and uranium – as they shape people’s identity in relation to time and place.
This concluding chapter locates our present geological moment politically and economically, arguing that the major ecological degradation which has been made visible at the level of geological time is a result of the Lockean designation of ‘unused’ land as waste to be made productive. And crucially, this designation of land as waste goes hand in hand with the extraction from deep time: it involves bracketing out the long-term history of the landscape and its ecological future for the work of extracting economic value in the now. To expand our time horizons is, in fact, to recognise the contemporary relationship with deep time as wastage.
Taking as its focus the drained peatlands of the East Anglian fens, this chapter examines the formation and wastage of peat as a particular case study of human geological agency; a particular instance of the global transformation of a net carbon sink into a net carbon source. Here we see lived encounters with time depth that bring us face-to-face with temporal disjuncture: in particular, we see how the fenlands today find themselves locked-in to a present from which variation becomes unthinkable.
The work of mapping the processes of geological formation is entangled with the process of extraction from deep time – a conquest figured in relation to the coal measures. Building on Alfred Gell’s approach to the relationship between time and the ways in which it is culturally constructed, this chapter addresses the question ‘Whose time is deep time?’ through a consideration of the politics of marking the boundaries of time in nineteenth-century Imperial Britain, with a particular focus on the Cambridge geologist Adam Sedgwick.
Beginning with an ethnography of controversy in the representation of time at the Giant’s Causeway, County Antrim, this chapter focuses on the role of catastrophe as rupture in time, confronting us with the transformative potential of events that render planetary history radically discontinuous. Yet while in the nineteenth- and early twentieth-century history of the earth sciences catastrophism became displaced as orthodoxy by uniformitarian explanations, becoming a shadow mode of explanation associated primarily with Christian Biblical literalism, the significance of catastrophe in earth history has re-emerged in a distinct form through the recognition of mass extinction events. Indeed, it has a particular contemporary significance, as we increasingly recognise our own extractive relationship with time as catastrophe: vectors of a mass extinction event, the likes of which have occurred only five times in the last 540 million years or so.
We consider various aspects of longevity trend risk viewed through the prism of a finite time window. We show the broad equivalence of value-at-risk (VaR) capital requirements at a p-value of 99.5% to conditional tail expectations (CTEs) at 99%. We also show how deferred annuities have higher risk, which can require double the solvency capital of equivalently aged immediate anuities. However, results vary considerably with the choice of model and so longevity trend-risk capital can only be determined through consideration of multiple models to inform actuarial judgement. This model risk is even starker when trying to value longevity derivatives. We briefly discuss the importance of using smoothed models and describe two methods to considerably shorten VaR and CTE run times.
Increasing prevalence of overweight and obese people in England has led policymakers to consider regulating the use of price promotions on foods high in fat, sugar and salt content. In January 2019, the government opened a consultation programme for a policy proposal that significantly restricts the use of price promotions that can induce consumers to buy higher volumes of unhealthy foods and beverages. These proposed policies are the first of their kind in public health and are believed to reduce excess purchasing and, therefore, overconsumption of unhealthy products. This study summarises evidence relating price promotions to the purchasing of food and drink for home consumption and places it in the context of the proposed policy.
Non-systematic review of quantitative analyses of price promotions in food and drink published in peer-reviewed journals and sighted by PubMed, ScienceDirect & EBSCOhost between 1980 and January 2018.
While the impact of price promotions on sales has been of interest to marketing academics for a long time with modelling studies showing that its use has increased food and drink sales by 12–43 %, it is only now being picked up in the public health sphere. However, existing evidence does not consider the effects of removing or restricting the use of price promotions across the food sector. In this commentary, we discuss existing evidence, how it deals with the complexity of shoppers’ behaviour in reacting to price promotions on foods and, importantly, what can be learned from it in this policy context.
The current evidence base supports the notion that price promotions increase purchasing of unhealthy food, and while the proposed restriction policy is yet to be evaluated for consumption and health effects, there is arguably sufficient evidence to proceed. This evidence is not restricted to volume-based promotions. Close monitoring and proper evaluation should follow to provide empirical evidence of its intended and unintended effects.
In the face of debates about the Anthropocene - a geological epoch of our own making - and contemporary concerns about ecological crisis and the Sixth Mass Extinction, it is more important than ever to locate the timeframe of human activity within the deep time of planetary history. This path-breaking book is a timely critical review of the anthropology of time, exploring our human relationship with the timescale of geological formation. Richard D. G. Irvine shows how the time-horizons of social life are a matter of crucial concern, and lays bare the ways in which human activity becomes severed from the long-term geological and ecological rhythms on which it depends.