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The momentum dispersion model for flows in isotropic porous media has been validated and successfully applied by Rao & Jin (2022, J. Fluid Mech., vol. 937, A17). However, the anisotropic coupled models concerning heat–fluid–solid interactions in turbulent forced convection requires further development. This research proposes various anisotropic physical coefficient tensors to model the total drag ${R}_{i}$, interphase energy resistance $H$, momentum dispersion and thermal dispersion accounting for both anisotropic and isotropic scenarios. The effective physical coefficients of the Darcy–Forchheimer equation regarding ${R}_{i}$ are adapted to accommodate anisotropy. The heat transfer coefficient $h$ between the solid and fluid, despite being a scalar, is also required to depend on the local flow direction in anisotropic cases. Two scaling laws of $h$ with respect to a local Reynolds number ${\textit{Re}_{K}}$ are found: $h\sim \textit{Re}_K^2$ for the Darcy regime, and $h\sim \textit{Re}_{K}^{1/2}$ for the Forchheimer regime, with a transition at ${\textit{Re}_{K}}\sim 1$. The influence of momentum and thermal dispersions, along with the modelling errors of ${R}_{i}$ and $H$ originating from heterogeneity, are approximated using a second-order pseudo-stress tensor and a pseudo-flux vector, respectively. The effective viscosity and thermal diffusivity tensors are simplified into longitudinal and transverse components using tensor symmetries, and are assumed to rely mainly on another local Reynolds number ${\textit{Re}_{d}}$. Both components of the effective viscosity are positive in isotropic cases, whereas the longitudinal component may be negative in anisotropic cases, mainly serving as a compensation of overestimated drag. The coupled models are applied to simulate turbulent forced thermal convection in porous media with one or two length scales across a wide range of Reynolds numbers. The comparisons with direct numerical simulations results imply that the coupled macroscopic models can accurately predict not only statistically stationary distributions but also real-time changes in velocity and temperature.
The “Concession to Avicenna,” also known as the seventh chapter of De substantia orbis, is one of Averroes’s several philosophical attempts to reconcile between the corporeality of the celestial bodies and their eternity. The “Concession” contains a brief and rare nod of approval to Avicenna, which prompted the title under which it circulated. The work, lost in Arabic, survives in Ṭodros Ṭodrosi’s Hebrew translation from 1340, from which Abraham de Balmes’s subsequent Latin translation was made in the early sixteenth century. The present contribution offers, for the first time, an edition of the text in Hebrew and its original Latin translation (before its editorial revision for the 1525 editio princeps), alongside an introduction, a philosophical analysis of the argument, an English translation, and a glossary.
With a growing body of research exploring how employees perceive and respond to human resource management (HRM) practices, the strategic HRM field faces the challenge of assessing how insights have evolved and which theoretical perspectives have shaped them. This study presents a bibliometric review of 292 empirical research on employee perceptions of HRM practices, focusing on (1) the major research interests explored, (2) the theoretical perspectives applied, and (3) their evolution over the last 25 years. The analysis reveals a reoccurring emphasis on performance-oriented variables, such as engagement, suggesting a tendency to rely on quantifiable outcomes while sidelining alternative constructs like employee well-being. It also highlights the dominance of a limited set of theoretical perspectives commonly applied, with alternative perspectives remaining underutilised. By mapping how topical areas and theories intersect, this study refines the classification of theoretical perspectives and contributes to a more critical understanding of the strategic HRM field. Potential implications are discussed to outline actionable recommendations for future research.
Modern conflicts are characterized by wide-spread use of conventional explosive ordnance (EO), improvised explosive devices (IEDs), and other air-launched explosives. In contrast to advances in military medicine and high-income civilian trauma systems since the United States-led wars in Afghanistan and Iraq, the mortality rate among civilian EO casualties has not decreased in decades. Although humanitarian mine action (HMA) stakeholders have extensive presence and medical capabilities in EO-affected settings, coordination between HMA and health actors has not been leveraged systematically.
Methods:
Data from a prior systematic review of emergency care interventions feasible within the context of HMA activities and low-resource health care systems were used to model mortality reduction among EO victims. Interventions were categorized using the World Health Organization (WHO) Emergency Care System Framework sites of “scene,” “transport,” and “facility.” The cumulative impact of the interventions on EO-related mortality was estimated using pooled effect estimates and simulation modeling.
Results:
The meta-analysis included 16 reports from 13 countries, representing 127,505 injured persons. Pooled effect estimates across subcategories of emergency care interventions were 0.42 for layperson transportation (95%CI, 0.24-0.74), 0.79 for prehospital notification systems (95%CI, 0.51-1.19), 0.52 for prehospital trauma care training courses (95%CI, 0.46-0.59), 0.67 for facility-based trauma care training courses (95%CI, 0.48-0.92), and 0.66 for facility-based trauma team organization and activation protocols (95%CI, 0.45-0.97). A 68% reduction in mortality (95%UI, 57%-79%) was observed when implementing the full set of interventions in a region with no prior implemented interventions.
Conclusion:
Enhanced coordination between HMA and health actors to implement a structured set of emergency care interventions holds potential to significantly reduce preventable death among civilian EO casualties.
Standing acoustic waves in a channel generate time-mean Eulerian flows. In homogeneous fluids, these streaming flows have been shown by Rayleigh to result from viscous attenuation of the waves in oscillatory boundary (i.e. Stokes) layers. However, the strength and structure of the mean flow significantly depart from the predictions of Rayleigh when inhomogeneities in fluid compressibility or density are present. This change in mean flow behaviour is of particular interest in thermal management, as streaming flows can be used to enhance cooling. In this work, we consider standing acoustic wave oscillations of an ideal gas in a differentially heated channel with hot- and cold-wall temperatures respectively set to $T_* + \Delta \varTheta _*$ and $T_*$. An asymptotic analysis for a normalised temperature differential $\Delta \varTheta _*/T_*$ comparable to the small acoustic Mach number is performed to capture the transition between the two documented regimes of Rayleigh streaming ($\Delta \varTheta _*\,{=}\,0$) and baroclinic streaming ($\Delta \varTheta _* =O(T_*)$). Our analytical solution accounts for existing experimental and numerical results and elucidates the separate contributions of viscous torques in Stokes layers and baroclinic forcing in the interior to driving the streaming flow. The analysis yields a scaling estimate for the temperature difference $\Delta \varTheta _{c_*}$ at which baroclinic driving is comparable to viscous forcing, signalling the smooth transition from Rayleigh to baroclinic acoustic streaming.
This paper documents how the advent of the limited liability corporation contributed to the diffusion of steam technology during Sweden’s industrialization. Using longitudinal establishment-level data, we show that incorporation sharply raised the probability that industrial establishments adopted steam. Incorporation facilitated technology adoption partly by enabling smaller establishments to expand to a greater scale, where the use of steam became feasible. These results highlight that low barriers to incorporation may be an important lever for facilitating the diffusion of new technologies.
In the middle of the nineteenth century in cities and towns across North India a popular craze for the sitar drove untold numbers of amateur enthusiasts to seek instruction in Hindustani raga music from the only available source: the Muslim hereditary professional performers known as ustads. A long record of statements excoriating the ustads has generally been dismissed by contemporary scholars as colonially inspired propaganda that served a Hindu identitarian vision of music reform and institution-building for the incipient nation. This article accesses a collection of Urdu-language music instruction texts produced between 1863 and 1915 to offer a contrasting interpretation: the depiction of ustads as ignorant, ill-mannered, and addicted is propounded first and foremost by Muslim authors unconcerned with nationalism, but invested in opening the Hindustani music tradition to the uninitiated amateur. Close readings of narrative anecdotes from these texts alongside the 1910 and 1914 Marathi-language works of famed scholar and music reformer Vishnu Narayan Bhatkhande (1860–1936) reveal a continuity of concerns across language, region, and religious community. Bhatkhande and the earlier Urdu authors share not only their frustration with the half-trained and ill-behaved ‘fly-by-night’ ustad, but also their reverence for the masterful ustads whose reputations were threatened by the unchecked presence of charlatans in their midst.
Only a minority with mental disorders worldwide receive treatment with negligible coverage of interventions to prevent associated impacts, prevent mental disorders or promote mental well-being. Reasons include insufficient public mental health (PMH) skills and training. An electronic search found limited availability of PMH courses globally. Improved access to PMH training informed by a core curriculum will support sustainable reduction of mental disorders, promotion of population mental health well-being and broad associated impacts across sectors. Regular assessment of PMH training coverage and impact will support sustainable progress.
The World of Sugar, Ulbe Bosma’s compelling historical narrative on how sugar became a global commodity, and the accompanying introductory article in the International Review of Social History raise many fascinating points for further reflection and debate. In this commentary, I wish to highlight several points that resonate strongly with my own work at the Transnational Institute (TNI), a global think tank based in Amsterdam that connects social movements with academics and policymakers. These points of reflection are informed by TNI’s mission and practice of “scholar-activism”: the fact that we seek not only to interpret the world, but also to change it for the better, in particular for those exploited and oppressed classes and social groups. As my work principally involves collaboration with transnational agrarian movements, I pay particular attention to areas of Bosma’s analysis that carry implications for rural working people and for agrarian and environmental justice. This includes the role of sugar in the global land rush, the rise of sugar cane as a “flex crop and commodity”, and the ways in which “rural sugars” can be supported in peasant- and smallholder-based economies and livelihood strategies.
Cette note de recherche vise à offrir une première introduction aux enjeux de la recherche par sondage, en particulier lorsqu’on utilise des données provenant de panels non probabilistes, comme les sondages en ligne. Nous expliquons le concept clé d’ignorabilité, qui aide à comprendre comment les biais de sélection peuvent affecter les résultats, et comment certaines techniques statistiques – comme la post-stratification et le raking – peuvent tenter de les corriger. À l’aide de simulations, nous montrons dans quels contextes ces méthodes peuvent fonctionner, et dans quels cas elles échouent. Les résultats suggèrent que les sondages non probabilistes présentent des limites importantes pour produire des estimations valides, mais qu’il existe aussi des pistes pour en améliorer l’usage, surtout dans le contexte actuel où ces données sont de plus en plus courantes en sciences sociales.
The use of extended reality (XR) for education of healthcare personnel (HCP) is increasing. XR equipment is reusable and often shared between HCP in clinical areas; however, it may not include manufacturer’s instructions for use (MIFU) in healthcare settings. Considerations for the selection of equipment and development of cleaning and disinfection protocols are described.
When a liquid film on a horizontal plate is driven in motion by a shear stress, surface waves are easily generated. This paper studies such flow at moderate Reynolds numbers, where the surface tension and inertial force are equally important. The governing equations for two-dimensional flows are derived using the long-wave approximation along with the integral boundary-layer theory. For small disturbances, the dispersion relation and neutral curves are determined by the linear stability analysis. For finite-amplitude perturbations, the numerical simulation suggests that the oscillations generated by the perturbation in a certain place continuously spread to the surrounding areas. When the effects of surface tension and gravity reach equilibrium, steady-state solutions will emerge, which include two cases: solitary waves and periodic waves. The former have heteroclinic trajectories between two stationary points, while the latter include five patterns at different parameters. In addition, there are also periodic waves that do not converge after a long period of time. During these evolution processes, strange attractors appear in the phase space. By examining the Poincaré section and the sensitivity to initial values, we demonstrate that these waves can be divided into two types: quasi-periodic and chaotic solutions. The specific type depends on parameters and initial conditions.
How does a CEO’s early-life poverty trauma exposure affect a firm’s involvement in poverty alleviation and the prioritization between generic and strategic involvement? We find that CEOs with such exposure are more likely to engage in both types of poverty alleviation initiatives. We further examine the asymmetry effect and find that these CEOs will prioritize strategic over generic involvement in poverty alleviation. We also conduct a post hoc analysis to test the mediating effect of emphasis on resource efficiency on the relationship between CEOs’ early-life exposure to poverty trauma and the relative emphasis on strategic over generic involvement in poverty alleviation. Using a sample of Chinese publicly listed firms from 2016 to 2021, we find strong support for our predictions. Our study contributes to the literature on CEOs’ early-life experiences and corporate poverty alleviation engagement.
A saxicolous species of Chiodecton and two corticolous species of Enterographa are described as new to science. Chiodecton submontanum is characterized by a saxicolous habitat, irregularly verrucose thallus, inspersed hymenium, ascospores usually exceeding 50 μm in length with 6–10 septa and the presence of roccellic acid. Enterographa sparrii has immersed, perithecioid ascomata in indistinct to slightly raised pseudostromata, 40–55 μm long ascospores with 6–9 septa and contains roccellic acid. Enterographa subcaudata has immersed, more or less round ascomata with a black disc, 35–58 μm long ascospores with 6–12(–15) septa and schizopeltic acid in its chemistry. Additionally, an identification key to the members of Roccellaceae reported so far from India is provided.
Parental criminality is a risk factor for crime, but little is known about why some individuals exposed to this risk refrain from crime. We explored associations of resting heart rate (RHR), systolic blood pressure (SBP), cognitive ability (CA), and psychological functioning (PF) with criminal convictions among men with a convicted parent, accounting for unmeasured familial factors in sibling analyses. Data were obtained from Swedish registers, including all men born in Sweden between 1958 and 1992 with a convicted parent (N = 495,109), followed for up to 48 years. The potential protective factors were measured at mandatory conscription. Outcomes were conviction of any, violent, and non-violent crime. Survival analyses were used to test for associations, adjusting for measured covariates and unmeasured familial factors. Higher levels of RHR, SBP, CA, and PF were associated with reduced risk of criminality after adjusting for covariates. RHR associations were largely explained by familial factors. CA and PF associations were not due to sibling-shared confounders, in line with a causal interpretation. SBP results, indicating a protective effect against non-violent crime, warrant further investigation.
Let G be a locally compact, Hausdorff, second countable groupoid and A be a separable, $C_0(G^{(0)})$-nuclear, G-$C^*$-algebra. We prove the existence of quasi-invariant, completely positive and contractive lifts for equivariant, completely positive and contractive maps from A into a separable, quotient $C^*$-algebra. Along the way, we construct the Busby invariant for G-actions.
Newgrange, the Neolithic monument and centerpiece of the Brú na Bóinne UNESCO World Heritage complex, is a high-profile example of prehistoric societies’ observation of, and reverence for, solar events. Comparatively little is known about how these concepts were remembered by those using Newgrange over subsequent millennia. While excavations have uncovered large quantities of later material culture, debate continues about what these subsequent activities represent. We combine zooarchaeological, radiocarbon, and isotopic evidence to assess the nature and seasonality of human–animal–environment relationships at Newgrange. Results show a concentration of feasting activity, focused on pigs, dating to 2600–2450 BC and indicate that most pigs were slaughtered shortly after a period of rapid, pannage-fueled weight gain. This seasonal specificity indicates feasting likely occurred in the weeks around the winter solstice and suggests that, centuries after passage tomb construction ended, practices at Newgrange continued to focus on the general winter solstice timeframe. We also connect a unique isotopic signature for mast (tree nuts) with pannage husbandry, a pattern that should allow for reinterpretation of archaeological pig diets and human–woodland relationships across Europe.
The Tudor and Stuart New Year's gift exchange rolls were prepared every year. The manuscripts were kept in the Jewel House as an audit and accounting record of the inventory and were removed when the contents of the Jewel House were dispersed in 1649. A total of thirty-five rolls of the Tudor and Stuart exchanges are known to be extant. Between the mid-seventeenth century and the present time these manuscripts were held in private muniment collections, sold at auctions and intermittently studied by dilettantes. Individuals purchased the rolls for personal study and as curiosities. Antiquarians and Fellows of the Society of Antiquaries of London were interested in and recognised the value of these gift rolls. Antiquarian book dealers and autograph collectors enhanced the rarity of royal signatures and emphasised the rarity of these manuscripts. Sale catalogues of various bookdealers and auction houses record the path of the gift rolls from and/or into private collections and archives. Presently, while they should be included with the other state papers, these manuscripts are in the custody of eleven different archival locations in three countries. This paper tracks the preservation of these manuscripts through their ownership journeys and the records related to their locations.