Scoping study of the feasibility of developing a software tool to assist designers of pedestrian crossing places

This report is the outcome of a scoping study of how guidance can be provided for practising highway engineers in designing informal pedestrian crossing facilities. The main component of this report is an analysis by an IT consultant of a range of mechanisms for delivery of this. The study was informed by the opinions of a group of practitioners who have a direct interest in the provision of pedestrian facilities. These results are placed in context and their consequences are explored in the first part of the report

An experimental pineapple juice concentrate plant incorporating flavour recovery. 2. Instrumentation and control of the turbulent thin film evaporator

The control of a Luwa turbulent thin film evaporator has been greatly improved by the installation of pneumatic steam temperature control devices, a vacuum steam supply, a cartesian manostat for vapour pressure control and positive delivery pumps for feeding juice and discharging concentrate. Appropriate recording instruments have also been installed

Winter wheat production in central Saskatchewan

Non-Peer Reviewe

Pneumatic applicators – new technology for applying fertilizer and seeding

Non-Peer Reviewe

Re-examining Strategic Flexibility: A Meta-Analysis of its Antecedents, Consequences and Contingencies

Strategic flexibility (SF) is a concept that has evolved from strategy through other disciplines, including management, marketing, innovation, entrepreneurship and operations. However, despite attempts to consolidate the domain of SF, there remain theoretical and empirical tensions underlying its antecedents, the consequences and contingencies of SF. Based on 106 independent samples reported in 98 different studies (n = 26,940 firms), we provide a meta-analytical examination of these tensions. We highlight and resolve several disagreements regarding the enablers, inhibitors and triggers of SF, and we reveal an adjusted mean performance effect of 0.24. We further find that the measurement of SF, as well as some, but not all, dimensions of the environment, moderate the performance effect. Finally, an explorative analysis reveals that innovation outcomes and market outcomes mediate the positive relationship between SF and financial outcomes, in addition to a negative direct effect. These insights provide a comprehensive and coherent understanding of the nomological network of SF and a stronger basis for further theorising and conducting empirical research. Moreover, our findings help firms to refine their strategy by implementing the right enablers that drive SF and to understand how and when their investment in SF pays off

Exotic smooth structures on 4-manifolds with zero signature

For every integer $k\geq 2$, we construct infinite families of mutually nondiffeomorphic irreducible smooth structures on the topological $4$-manifolds $(2k-1)(S^2\times S^2)$ and (2k-1)(\CP#\CPb), the connected sums of $2k-1$ copies of $S^2\times S^2$ and \CP#\CPb.Comment: 6 page

Constructions of generalized complex structures in dimension four

Four-manifold theory is employed to study the existence of (twisted) generalized complex structures. It is shown that there exist (twisted) generalized complex structures that have more than one type change loci. In an example-driven fashion, (twisted) generalized complex structures are constructed on a myriad of four-manifolds, both simply and non-simply connected, which are neither complex nor symplectic

Superconductors with Magnetic Impurities: Instantons and Sub-gap States

When subject to a weak magnetic impurity potential, the order parameter and quasi-particle energy gap of a bulk singlet superconductor are suppressed. According to the conventional mean-field theory of Abrikosov and Gor'kov, the integrity of the energy gap is maintained up to a critical concentration of magnetic impurities. In this paper, a field theoretic approach is developed to critically analyze the validity of the mean field theory. Using the supersymmetry technique we find a spatially homogeneous saddle-point that reproduces the Abrikosov-Gor'kov theory, and identify instanton contributions to the density of states that render the quasi-particle energy gap soft at any non-zero magnetic impurity concentration. The sub-gap states are associated with supersymmetry broken field configurations of the action. An analysis of fluctuations around these configurations shows how the underlying supersymmetry of the action is restored by zero modes. An estimate of the density of states is given for all dimensionalities. To illustrate the universality of the present scheme we apply the same method to study `gap fluctuations' in a normal quantum dot coupled to a superconducting terminal. Using the same instanton approach, we recover the universal result recently proposed by Vavilov et al. Finally, we emphasize the universality of the present scheme for the description of gap fluctuations in d-dimensional superconducting/normal structures.Comment: 18 pages, 9 eps figure

Vortex Pinball Under Crossed AC Drives in Superconductors with Periodic Pinning Arrays

Vortices driven with both a transverse and a longitudinal AC drive which are out of phase are shown to exhibit a novel commensuration-incommensuration effect when interacting with periodic substrates. For different AC driving parameters, the motion of the vortices forms commensurate orbits with the periodicity of the pinning array. When the commensurate orbits are present, there is a finite DC critical depinning threshold, while for the incommensurate phases the vortices are delocalized and the DC depinning threshold is absent.Comment: 4 pages, 4 postscript figure