Guest Editors' Introduction II: reflections on scholarship and activism in Canada and Ireland

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A brazing process for Cb-1Cr heat receiver tubes Final report

Zirconium-based alloy brazing of internal fins of Cb-1Zr foil to Cb-1Zr heat receiver tube

Observation of surface wave patterns modified by sub-surface shear currents

We report experimental observations of two canonical surface wave patterns --- ship waves and ring waves --- skewed by sub-surface shear, thus confirming effects predicted by recent theory. Observed ring waves on a still surface with sub-surface shear current are strikingly asymmetric, an effect of strongly anisotropic wave dispersion. Ship waves for motion across a sub--surface current on a still surface exhibit striking asymmetry about the ship's line of motion, and large differences in wake angle and transverse wavelength for upstream vs downstream motion are demonstrated, all of which in good agreement with theoretical predictions. Neither of these phenomena can occur on a depth-uniform current. A quantitative comparison of measured vs predicted average phase shift for a ring wave is grossly mispredicted by no-shear theory, but in good agreement with predictions for the measured shear current. A clear difference in wave frequency within the ring wave packet is observed in the upstream vs downstream direction for all shear flows, while it conforms with theory for quiescent water for propagation normal to the shear current, as expected. Peak values of the measured 2-dimensional Fourier spectrum for ship waves are shown to agree well with the predicted criterion of stationary ship waves, with the exception of some cases where results are imperfect due to the limited wave-number resolution, transient effects and/or experimental noise. Experiments were performed on controlled shear currents created in two different ways, with a curved mesh, and beneath a blocked stagnant-surface flow. Velocity profiles were measured with particle image velocimetry, and surface waves with a synthetic schlieren method. Our observations lend strong empirical support to recent predictions that wave forces on vessels and structures can be greatly affected by shear in estuarine and tidal waters.Comment: 21 pages, 11 figure

Book review: colonial coptivity during the First World War: internment and the fall of the German empire, 1914-1919 by Mahon Murphy

In Colonial Captivity during the First World War: Internment and the Fall of the German Empire, 1914-1919, Mahon Murphy offers a comprehensive study of the experiences of the 20,000 Germans in colonies who spent in time in Allied captivity during World War One. This is an impressive analysis that uses internment as a prism to examine the War’s extra-European theatres, underscoring the conflict’s global dimensions and critically examining imperial notions of race, writes Joshua Smeltzer

Book review: Marx, capital and the madness of economic reason by David Harvey

In Marx, Capital and the Madness of Economic Reason, David Harvey provides a new systemisation of Karl Marx's work in order to uncover, explore and explain the 'madness of economic reason' in the twenty-first century. This is an impressively wide-ranging work that draws upon Marx as a toolbox for contending with the crises of capital today, but Joshua Smeltzer is left questioning ..

Book review: assembly by Michael Hardt and Antonio Negri

Why is it that so many revolutions and other social movements have seemingly failed to bring their emancipatory ideals into being? In response to this enduring question, Michael Hardt and Antonio Negri offer Assembly, which inverts the traditional division of revolutionary labour to give strategic force to the assembly of the multitude. While the book aims to offer a blueprint for forms of collective organisation that can bring about a more democratic and just society, Joshua Smeltzer is unconvinced that the authors’ hollowing out of the traditional sphere of the political can deliver this social alternative

Inlet and airframe compatibility for a V/STOL fighter/attack aircraft with top-mounted inlets

Aerodynamic force and inlet pressure data are obtained for 9.5% force and pressure models of a V/STOL fighter/attack aircraft configuration with top mounted twin inlets. Data are presented from tests conducted in the Ames Unitary Wind Tunnels at Mach numbers of 0.6, 0.9, and 1.2 at angles of attack up to 27 deg. and angles of sideslip up to 12 deg. Trimmed aerodynamic characteristics and inlet performance are compared for three different leading edge extension (LEX) configurations. The effects of wing leading and trailing-edge flaps on the inlet are also determined. Maneuver perfromance is calculated form combined force and inlet pressure data. The largest of the three LEX sizes tested gives the best airplane maneuver performance. Wing flap deflections improved inlet recovery at all Mach numbers

Book review: the ordinary virtues: moral order in a divided world by Michael Ignatieff

In The Ordinary Virtues: Moral Order in a Divided World, Michael Ignatieff aims to take ethics out of the seminar room by examining the role of 'ordinary virtues' such as trust, forgiveness and reconciliation in local contexts and settings. While the book travels the globe to underscore both the fragility and strength of community-based networks of solidarity as part of Ignatieff's broader commitment to ..