Development of a novel metastable composite material

The development of a new family of mouldable metastable composite materials has been demonstrated. Their special quality is derived from the ability to maintain the matrix as a supercooled liquid or gel whose solidification can be triggered mechanically, as desired, by a user. This article describes some aspects of the development work. In particular, the following are explained: the choice of matrix material; the use of additives to enhance the properties of the matrix; and the selection of reinforcement fibre. As part of the work, some mechanical testing was performed on several variations of a matrix-fibre pair and, to demonstrate the potential of such materials, some comparisons were made with a possible competitor material, a glass-reinforced urethane. It was shown that the metastable material could be formulated to provide mechanical properties that would make it suitable for applications such as orthopaedic casting, splinting and body armour, and in items of sports equipment, these being areas where its mouldability could be particularly desirable

On the Viability of Lattice Perturbation Theory

In this paper we show that the apparent failure of QCD lattice perturbation theory to account for Monte Carlo measurements of perturbative quantities results from choosing the bare lattice coupling constant as the expansion parameter. Using instead ``renormalized'' coupling constants defined in terms of physical quantities, like the heavy-quark potential, greatly enhances the predictive power of lattice perturbation theory. The quality of these predictions is further enhanced by a method for automatically determining the coupling-constant scale most appropriate to a particular quantity. We present a mean-field analysis that explains the large renormalizations relating lattice quantities, like the coupling constant, to their continuum analogues. This suggests a new prescription for designing lattice operators that are more continuum-like than conventional operators. Finally, we provide evidence that the scaling of physical quantities is asymptotic or perturbative already at $\beta$'s as low as 5.7, provided the evolution from scale to scale is analyzed using renormalized perturbation theory. This result indicates that reliable simulations of (quenched) QCD are possible at these same low $\beta$'s.Comment: 3

Non-classical computing: feasible versus infeasible

Physics sets certain limits on what is and is not computable. These limits are very far from having been reached by current technologies. Whilst proposals for hypercomputation are almost certainly infeasible, there are a number of non classical approaches that do hold considerable promise. There are a range of possible architectures that could be implemented on silicon that are distinctly different from the von Neumann model. Beyond this, quantum simulators, which are the quantum equivalent of analogue computers, may be constructable in the near future

A computational method for the coupled solution of reaction–diffusion equations on evolving domains and manifolds: application to a model of cell migration and chemotaxis

In this paper, we devise a moving mesh finite element method for the approximate solution of coupled bulk–surface reaction–diffusion equations on an evolving two dimensional domain. Fundamental to the success of the method is the robust generation of bulk and surface meshes. For this purpose, we use a novel moving mesh partial differential equation (MMPDE) approach. The developed method is applied to model problems with known analytical solutions; these experiments indicate second-order spatial and temporal accuracy. Coupled bulk–surface problems occur frequently in many areas; in particular, in the modelling of eukaryotic cell migration and chemotaxis. We apply the method to a model of the two-way interaction of a migrating cell in a chemotactic field, where the bulk region corresponds to the extracellular region and the surface to the cell membrane

Follow the leader or the pack? Regulatory focus and academic entrepreneurial intentions

Drawing on the academic entrepreneurship and regulatory focus theory literature, and applying a multilevel per- spective, this paper examines why university academics intend to engage in formal (spin-off or start-up companies and licensing university research) or informal (collaborative research, contract research, continuous professional development, and contract consulting) commercialization activities and the role local contextual factors, in partic- ular leaders and work-group colleagues (peers), play in their commercialization choices. Based on a survey of 395 science, technology, engineering, and mathematics (STEM) academics working in 14 Scottish universities, the research findings suggest that an individual’s chronic regulatory focus has a direct effect on their formal and informal commercialization intent. The results reveal that the stronger an individual’s chronic promotion focus the stronger their formal and informal commercialization intentions and a stronger individual chronic prevention focus leads to weaker intentions to engage in informal commercialization. In addition, when contextual interaction effects are considered, leaders and workplace colleagues have different influences on commercialization intent. On the one hand, promotion-focused leaders can strengthen and prevention-focused leaders can under certain cir- cumstances weaken a promotion-focused academic’s formal commercialization intent. On the other hand, the level of workplace colleague engagement, acting as a reference point, strengthens not only promotion-focused academ- ics’ intent to engage in formal commercialization activities, but also prevention-focused academics’ corresponding informal commercialization intent. As such, universities should consider the appointment of leaders who are strong role models and have a track record in formal and/or informal commercialization activities and also con- sider the importance workplace colleagues have on moderating an academic’s intention to engage in different forms of commercialization activities

Expected Precision of Higgs Boson Partial Widths within the Standard Model

We discuss the sources of uncertainty in calculations of the partial widths of the Higgs boson within the Standard Model. The uncertainties come from two sources: the truncation of perturbation theory and the uncertainties in input parameters. We review the current status of perturbative calculations and note that these are already reaching the parts-per-mil level of accuracy for the major decay modes. The main sources of uncertainty will then come from the parametric dependences on alpha_s, m_b, and m_c. Knowledge of these parameters is systematically improvable through lattice gauge theory calculations. We estimate the precision that lattice QCD will achieve in the next decade and the corresponding precision of the Standard Model predictions for Higgs boson partial widths.Comment: 20 pages, 1 figure; v2: minor typo correction

Ideas of landscape in John Keats’ Teignmouth poems

In the spring of 1818 John Keats journeyed to Teignmouth in Devon to care for his dying brother. This essay explores his idea of landscape in three poems of the period. The term “landscape” designates not only the geographical sense of land but also the meanings that are imposed upon or emanate from issues concerning land. Keats made clear in letters to close friends that he held Devon and its people in low esteem. Yet, in his poetry, he curiously rejoices in the beauties of Devon and its people, assuming even the idiosyncrasies of a south-west country brogue. What accounts for these extraordinary shifts in mood? The essay argues that even when the reality of Devonshire failed him, Keats’ poetry reflected a willingness to reach for an imagined landscape where, free of the tribulations of actual existence, he lay kissing a milk maiden in the fields and embracing the images of country life

Creating market failure: business-government relations in the British paper-pulp industry, 1950–1980

This article examines the nuances and complexities of business-government relations in the British paper-pulp industry between 1950 and 1980 through the prism of interactions between Wiggins, Teape & Co., a paper company, and various U.K. government departments in the postwar period. It highlights the complexity of business-government and interdepartmental relations and tensions, set against the global and domestic paper industry competition and the United Kingdom’s international economic position. Longstanding industry underinvestment and interdepartmental tensions in government are identified as principal contributors to the failing competitiveness of the industry and of British businesses more generally in the twentieth century

Observations on the non-starchy barley polysaccharides

1. Methods have been developed whereby an extract of barley containing the non-starchy water soluble polysaccharides may be fractionated. The most successful fractionating agent used was ammonium sulphate.2. At least two distinct polysaccharides have been isolated. One, a pure glucosan which possesses a small negative specific rotation and may be likened to a short chain cellulose; two, a pentosan which gives arabinose and xylose on hydrolysis and which is suspected to be a mixed polysaccharide.3 The precise source of the water soluble non- starchy polysaccharides remains undetermined. The husk and embryo would appear to be deficient in these materials and the most probable location seems to be some part of the endosperm.4. The nature of action cf the cell-wall hydrolysing enzyme systems of barley has been examined. The results obtained confirm previous work which postulated two enzyme systems - one, which had a disaggregating action, and the second which had a saccharifying action. Such data as is available indicate that the precise nature of the combined action of the two systems is more complex than at first suspected

Exploring Social Connections and Perceived Stress During COVID-19

This study evaluated university students’ levels of overall social connectedness, social connectedness with various groups (family, friends, classmates, instructors, school community), and perceived stress during the COVID-19 pandemic. Additionally, this study investigated whether there were associations between students’ overall social connectedness levels, levels of social connectedness with various groups, and perceived stress levels. Undergraduate students (n = 91) at a university in London, Ontario, completed a questionnaire comprising the Social Connectedness Scale, questions about social connections with particular groups, and the Perceived Stress Scale. A correlation analysis revealed a significant, negative correlation between overall social connectedness and perceived stress. Furthermore, hierarchical linear regression analyses revealed that levels of social connectedness with family and friends were the strongest significant predictors of both overall social connectedness level and perceived stress level. Students’ levels of perceived stress and overall social connectedness appeared lower than in past research, which could be a result of COVID-19