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Sesay draws from three hinterland protests against multinational corporations in the mining and agricultural sectors to examine how global capital influences central/local politics in postcolonial Sierra Leone. Focusing specifically on the mediating role of traditional rulers—a strong legacy of British colonial indirect rule—Sesay argues that hinterland protests not only enable the relative autonomy of rural citizens to (re)negotiate with the state outside existing political arrangements but also challenge the broker authority of these rulers in center/peripheral relations. While some protests form new alignment of interest with traditional rulers, others allow rural citizens to bypass their chiefs to summon the attention of central authorities. In either of these processes, the local constituents question the position of chiefs in the indirect governance system and shape the governing strategies adopted by the central government to rule over the hinterland.
In Mediterranean-type climates, terminal drought induces grain yield losses in wheat. Antitranspirants can reduce the impacts of terminal drought and improve yield, but the mechanisms involved are not fully understood. Among other impacts, drought elevates endogenous abscisic acid (ABA) concentration. Here, the effectiveness of a film antitranspirant (di-1-p-menthene) was studied in relation to plant water status and spike ABA. The objective was to determine whether drought amelioration with di-1-p-menthene was solely mediated through a reduction in ABA by comparing its effects to that of fluridone (an ABA inhibitor). The treatments were assessed in a randomized complete block design in two field experiments in spring and summer of 2020, with six and eight replicate blocks, respectively, at Harper Adams University, UK, to compare their effects on spike ABA, gas exchange and agronomic traits under progressive drought conditions. Di-1-p-menthene was applied at 1 l/ha; and fluridone at 10, 20 and 50 μM concentrations, at flag leaf emergence, growth stage 37 (GS37). Drought increased spike ABA and downregulated photosynthesis. Di-1-p-menthene and fluridone at some concentrations, reduced spike ABA and photosynthesis. Di-1-p-menthene suppressed transpiration and spike ABA, each by 21% but increased grain yield by 27%. In contrast, although fluridone (at 10 and 50 μM) also reduced spike ABA (by 16%), overall, it did not alter transpiration or grain yield. The results suggest that yield improvement with di-1-p-methene is mediated through mechanisms that involve conservation of plant water linked to reduced transpiration, with inhibition of spike ABA playing a secondary role.
Some responses to analogies between abortion and infanticide appeal to Judith Jarvis Thomson's argument for the permissibility of abortion. I argue that these responses fail because a parallel argument can be constructed for the permissibility of infanticide. However, an argument on the grounds of a right to choose to become a parent can maintain that abortion is permissible but infanticide is not by recognizing the normative significance and nature of parenthood.
In this squib, I provide arguments in favour of the view that Danish rundt is a postposition. The functional, semantic, and syntactic properties of adpositions are discussed, and I show that competing analyses of rundt are falsifiable while the postposition analysis itself is not falsified.
Flow generation by colloidal motors activated by external stimuli is an important issue for active matter physics and several nanotechnological or biomedical applications. For instance, flow recirculation generated by rotating magnetic self-assemblies allows effective ‘pumping’ of a thrombolytic drug towards a blood clot along a blocked vessel. However, the physics of the flow generation in this case remains still poorly explored. This study is focused on the generation of a recirculation flow of a magnetic colloid (aqueous suspension of iron oxide nanoparticles with partially screened electrostatic repulsion) within a closed microfluidic channel via application of an external rotating magnetic field. The colloid undergoes reversible phase separation manifested through the appearance of micron-sized elongated aggregates. They synchronously rotate with the magnetic field and can generate macroscopic flows only in the presence of gradients of the aggregate concentration across the channel induced by superposition of a weak magnetic field gradient to the homogeneous rotating field. We achieve recirculation flows with a characteristic speed ${\sim} 5{-}8\;{\rm \mu}\textrm{m}\;{\textrm{s}^{ - \textrm{1}}}$ at low magnetic field amplitude and frequency (${H_0} \approx 3{-}10\;\textrm{kA}\;{\textrm{m}^{ - 1}}$, ${f = 5{-}15\ \textrm{Hz}}$) at low nanoparticle volume fraction ${\varphi _p} = (1.6{-}3.2) \times {10^{ - 3}}$. The concentration and velocity profiles have been assessed experimentally through particle tracking and particle image velocimetry, and have also been computed using the hydrodynamic diffusion approach coupled with the momentum balance equation with a magnetic torque term. The model correctly reproduces the shape of the experimental concentration and velocity fields and explains complex behaviours of the average recirculation speed as a function of governing parameters (${H_0}$, f, ${\varphi _p}$, channel size).
We naturally tend to think of our own opinions as akin to the coins we carry around in our pockets, transferable and yet inalienable. We may share or alter them, yet in form they remain fundamentally our own, sacrosanct as registers of our very sense of self. Hegel was aware of this relationship between opinion and subjectivity, and regarded such a bond as one of the great accomplishments of modernity itself. Yet for Hegel, excessive estimation of inwardness comes at a dangerous price. Truth reducible to subjective and arbitrary will, to caprice and without philosophical reflection, sets, in his view, a corrosive standard for ethics, politics and thinking itself. This essay will excavate from Hegel's corpus the conceptual groundwork for a critical theory of opinion relevant for the twenty-first century. The overall aim is to offer a holistic reading of Hegel's critique of opinion by drawing on both his early and late writings, tracking its appearance as an initial critique of subjectivism but subsequently developed in his political philosophy. We begin with Hegel's polemics during the Jena years and unearth opinion as an index for self-certitude. Second, we proceed to a focused analysis of Elements of the Philosophy of Right, paying particular attention to what Hegel describes as the contradiction of public opinion. Thirdly, Hegel's epistemological critique of opinion will be synthesized with his political critique of public opinion by returning to the category of certainty, not as a certainty found in an individual opinion, but a certainty in one's own subjective standpoint, while employing elements from Adorno's critique of epistemology. We will conclude by examining the contradiction of public opinion specifically in accordance with the historical conditions of civil society and therewith begin to situate the socio-epistemological problem of opinion as historically specific to capitalist society.
Social inequalities and marginality often go unrecognised in the Nordic welfare states. This project examines the effects of neoliberalism and intersectional inequality in Finland from a contemporary archaeology perspective; the case study is a Second World War German military camp turned into a working-class community occupied until the 1980s.
This study reports the first time-resolved particle image velocimetry characterization of a planar two-phase mixing layer flow, whose velocity field is measured simultaneously in gas and liquid streams. Two parallel air and water flows meet downstream of a splitter plate, giving rise to an initially spanwise invariant configuration. The aim is to elucidate further the mechanisms leading to the flow breakup in gas-assisted atomization. The complete experimental characterization of the velocity field represents a database that could be used in data-driven reduced-order models to investigate the global behaviour of the flow system. After the analysis of a selected reference case, a parametric study of the flow behaviour is performed by varying the liquid ($Re_l$) and gas ($Re_g$) Reynolds numbers, and as a consequence also the gas-to-liquid dynamic pressure ratio ($M$), shedding light on both time-averaged (mean) and unsteady velocity fields. In the reference case, it is shown that the mean flow exhibits a wake region just downstream of the splitter plate, followed by the development of a mixing layer. By increasing both $Re_l$ and $Re_g$, the streamwise extent of the wake decreases and eventually vanishes, the flow resulting in a pure mixing layer regime. The spectral analysis of the normal-to-flow velocity fluctuations outlines different flow regimes by variation of the governing parameters, giving more insights into the global characteristics of the flow field. As a major result, it is found that at high $Re_g$ and $M$ values, the velocity fluctuations are characterized by low-frequency temporal oscillations synchronized in several locations within the flow field, which suggest the presence of a global mode of instability. The proper orthogonal decomposition of velocity fluctuations, performed in both gas and liquid phases, reveals finally that the synchronized oscillations are associated with a low-frequency dominant flapping mode of the gas–liquid interface. Higher-order modes correspond to interfacial wave structures travelling with the so-called Dimotakis velocity. For lower gas Reynolds numbers, the leading modes describe higher frequency fingers shedding at the interface.