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The epibenthic euryhaline hydromedusa Vallentinia gabriellae Vannucci Mendes, 1948 is an olindiid species native to tropical Atlantic waters. Here, we describe the cryptic introduction of this species in an estuary along the coast of Kerala, in southwestern India. This study records the existence of V. gabriellae outside of Atlantic waters for the first time and documents its geographical range expansion. Our identification was based on a combined morphological and DNA barcoding assessment using the COI and 28S markers. Although we noted some morphological differences between our specimens and those from their native range, our findings were conclusive. We suggest that phenotypic plasticity may result from differences such as prey availability between the native and introduced habitats. V. gabriellae medusae are epibenthic and cling to a variety of hard and soft substrates, including bivalves. Our specimens were associated with the invasive fouling mussel Mytella strigata, and we suggest that V. gabriellae could have been transported along with these mussels to the Kerala coast.
Turbulent shear flows are abundant in geophysical and astrophysical systems and in engineering-technology applications. They are often riddled with large-scale secondary flows that drastically modify the characteristics of the primary stream, preventing or enhancing mixing, mass and heat transfer. Using experiments and numerical simulations, we study the possibility of modifying these secondary flows by using superhydrophobic surface treatments that reduce the local shear. We focus on the canonical problem of Taylor–Couette flow, the flow between two coaxial and independently rotating cylinders, which has robust secondary structures called Taylor rolls that persist even at significant levels of turbulence. We generate these structures by rotating only the inner cylinder of the system, and show that an axially spaced superhydrophobic treatment can weaken the rolls through a mismatching surface heterogeneity, as long as the roll size can be fixed. The minimum hydrophobicity of the treatment required for this flow control is rationalized, and its effectiveness beyond the Reynolds numbers studied here is also discussed.
A steady granular flow experiment was performed in a confined annular shear cell to examine how the wall friction coefficient $\mu _w$ degrades from the intrinsic sliding friction coefficient $f$ between the grains and the container wall. Two existing models are invoked to examine the decay trend of $\mu _w/f$ in view of the ratio of shear velocity to the square root of granular temperature $\chi$ (Artoni & Richard, Phys. Rev. Lett., vol. 115, 2015, 158001) and the ratio of grain angular and slip velocities $\varOmega$ (Yang & Huang, Granul. Matt., vol. 18, issue 4, 2016, p. 77), respectively. As both models correlate $\mu _w/f$ to different flow properties, a hidden relation is speculated between $\chi$ and $\varOmega$, or equivalently, between the granular temperature and the grain rotation speed. We used experiment data to confirm and reveal this hidden relation. From there, a unified $\mu _w/f-\chi$ model is proposed with physical meanings for the model coefficients and to show general agreement with the measured trend. Hence we may conclude that both the fluctuations in grain translations and their mean rotation are the crucial yet equivalent mechanisms to degrade $\mu _w/f$.
Cyril Fox's publication The archaeology of the Cambridge region (1923) is celebrated as a milestone in the development of landscape archaeology. Its centenary invites reflection on Fox's approach to landscape and on the development of knowledge about the archaeology of the Cambridge region over the intervening years. Here, the authors compare the evidence available to Fox with the results of three decades of development-led archaeology. The latter have revealed very high numbers of sites, with dense ‘packing’ of settlements in all areas of the landscape; the transformation in knowledge of clayland areas is particularly striking. These high-density pasts have far-reaching implications for the understanding of later prehistoric and Roman-period land-use and social relations.
This article argues that through the reinterpretation of the old theory of pouvoir constituant proposed by Sieyès, Carl Schmitt shows the impossibility of political modernity being anything other than authoritarian populism, whether by means of democratic or autocratic procedures. It is not that Schmitt's theory is authoritarian populism, but that modern politics, born out of the French Revolution, cannot be anything else. Schmitt's analyses of the idea of the people in political modernity in Dictatorship (1921), The Crises of Parliamentary Democracy (1923), Volksentscheid und Volksbegehren (1927), Constitutional Theory (1928), and State, Movement, People (1933) provide a fine analysis of the populist character of modernity. Something that those alive in the twenty-first century have been able to experience was theorized by Schmitt in an oracular way. Because of his keen insight he is still worth reading.
Praia Melão, the largest sugar mill and estate in São Tomé, active from the sixteenth to the nineteenth centuries, is the first archaeological site ever investigated on the island. It embodies the inception of the plantation economic system predicated on the labour of enslaved people and of local resistance.
After the unanimous endorsement of the UN Guiding Principles on Business and Human Rights (UNGPs) by the Human Rights Council in June 2011, human rights due diligence (HRDD) has become a common currency widely embraced among stakeholders operating in the business and human rights (BHR) field. The UNGPs envisage HRDD to be the primary tool for businesses to identify, prevent, mitigate and account for adverse impacts of their activities on internationally recognized human rights.
The take-up of mandatory human rights due diligence (HRDD) initiatives by states is continuously gaining momentum. There are now numerous states adopting some form of HRDD laws. While corporations being duly diligent in respecting human rights is a positive step towards addressing problems of business and human rights, these HRDD initiatives on their own may only be a form of window-dressing, that is, enabling states to put a smart spin on their efforts to address business and human rights issues without addressing some of the root causes of that predicament. As a result, HRDD laws are likely to be a helpful, but insufficient tool for addressing corporate abuse of human rights. One reason for this is because the root cause of many business and human rights problems is the structural elements and goals of corporate law facilitates corporate violations of human rights. So long as states fail to transform the way in which corporations operate – in part, by reconceptualizing corporate law – even the best drafted HRDD laws will be inadequate to halt corporate harms.
Juxtaposing the shared emphasis on the basic human need for companionship in the Eden Narrative and the Epic of Gilgamesh provides new insight, both into how the texts respectively present companionship and into the issues of anthropology and gender that have previously distracted readers from this theme. Focus on parallels between Eve and Shamhat, who initiates Enkidu into human civilization, has obscured Eve’s resonance with Enkidu, created to be a match for Gilgamesh, as Eve was for Adam. The match created for the semidivine Gilgamesh is the male, semibestial Enkidu; however, Adam’s “helper” is a female, explicitly contrasted with the animals, and “bone of [his] bones and flesh of [his] flesh.” Though the heroes of the epic constantly struggle at the boundaries of human existence, the Eden Narrative depicts humans, male and female, together created distinct from god and animal, though likewise compelled to acknowledge their limitations.