1,319 research outputs found
Trade-offs between leaf hydraulic capacity and drought vulnerability: morpho-anatomical bases, carbon costs and ecological consequences
No full textGiulia Veronica Varisco
No full textThe headword explains the biography and the contribution of the author Giulia Varisco to the children's literatur
Detecting and Quantifying Xylem Embolism by Synchrotron-Based X-Ray Micro-CT
No full textThe vulnerability to xylem embolism is a key trait underlying species-specific drought tolerance of plants, and hence is critical for screening climate-resilient crops and understanding vegetation responses to drought and heat waves. Yet, accurate determination of embolism in plant’s xylem is challenging, because most traditional hydraulic techniques are destructive and prone to artefacts. Hence, direct and in vivo synchrotron-based X-ray micro-CT observation of xylem conduits has emerged as a key reference technique for accurate quantification of vulnerability to xylem embolism. Micro-CT is nowadays a fundamental tool for studies of plant hydraulic architecture, and this chapter describes the fundamentals of acquisition and processing of micro-CT images of plant xylem
LTES with PCM and metal foam in convergent and divergent shell and tube configurations assuming external heat loss
No full textThermal energy storage (TES) systems have become highly relevant due to the need to cut carbon emissions, and one of the most promising TES systems is the latent heat one (LTES) based on phase change materials (PCMs). However, the low thermal conductivity and poor heat transfer capabilities of PCMs limit their performance. The LTES, which in this study incorporate phase change materials (PCMs) and metal foams, offer key benefits over traditional sensible heat storage options. The inclusion of metal foams increases the thermal conductivity of PCMs. This research examines a vertical shell-and-tube setup with a non-uniform internal tube cross-section, considering two different configurations: convergent internal tube and divergent one. It is also considered an inclination angle variation of the internal tube. In addition, it is made the assumption of external heat losses on the lateral surface. Heat transfer and phase change processes are analyzed using the Brinkman-Forchheimer-extended Darcy model and the enthalpy-porosity approach. The numerical solutions are performed through Ansys-Fluent. Findings indicate that LTES systems using metal foam and PCM have improved heat transfer, particularly in configurations with converging tube sections. Although higher heat loss during the melting, the convergent configuration has the faster melting time at each inclination angle
Ytterbium Disilicate/Monosilicate Multilayer Environmental Barrier Coatings: Influence of Atmospheric Plasma Spray Parameters on Composition and Microstructure
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Ytterbium Disilicate/Monosilicate Multilayer Environmental Barrier Coatings: Influence of Atmospheric Plasma Spray Parameters on Composition and Microstructure
by Giulia Di Iorio,Laura Paglia *ORCID,Giulia PedrizzettiORCID,Virgilio GenovaORCID,Francesco MarraORCID,Cecilia BartuliORCID andGiovanni PulciORCID
INSTM Reference Laboratory for Materials and Surface Engineering, Sapienza University of Rome, Eudossiana 18, 00184 Rome, Italy
*
Author to whom correspondence should be addressed.
Coatings 2023, 13(9), 1602; https://doi.org/10.3390/coatings13091602
Original submission received: 10 August 2023 / Revised: 31 August 2023 / Accepted: 11 September 2023 / Published: 13 September 2023
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Abstract
SiC/SiC ceramic matrix composites (SiCf/SiC CMCs) are regarded as the new materials for the hot-section components of aircraft gas turbine engines, since they have one-third of the density of metallic superalloys, a higher temperature capability, good mechanical strength, and excellent thermal shock resistance. However, high-temperature water-vapor-rich combustion gases can induce severe surface recession phenomena in SiC/SiC leading to component failure. For this reason, it is necessary to design protective coatings, i.e., environmental barrier coatings (EBCs), able to protect the SiC/SiC surface in combustion environments. In the present work, ytterbium monosilicate (Yb2SiO5), stable when exposed to water vapor at high temperatures, and ytterbium disilicate (Yb2Si2O7), characterized by a thermal expansion coefficient closer to that of the substrate, were selected for a multilayer EBC system. EBCs were processed using the atmospheric plasma spray (APS) technique. A set of deposition parameters were tested, varying the power of the torch, and the composition and microstructure of the deposited coatings were studied in terms of porosity, crack density, and post-deposition phase retention by performing SEM, EDS, and XRD analysis. The results allow for the definition of the influence of deposition parameters on the final properties of multilayer EBC coatings
Metabolic and anthropometric alterations in a population of HIV infected patients with a high prevalence of lipodystrophy: associations with HCV coinfection
No full textData are still fragmentary so as to characterized the wide range of metabolic alterations in HIV-HCV co-infected patients in relation with their behavioural and anthropometric peculiarities
The role of virological and immunological parameters on the diagnosis of metabolic syndrome in HIV-associated lipodystrophy
No full textThe aim of our study is to analyse metabolic syndrome (MS) prevalence in a cohort of HIV patients and to apply a statistical model to HIV viro-immunological and MS parameters to explore relations among variables
Efficacy and safety of medical and surgical interventions for treating HIV-related lipodystrophy in women
No full textHIV-related lipodistrophy syndrome in women is rarely described, and its progression is not well characterized
Correction to: Safety and Psychological Outcomes of Tandem t:Slim X2 Insulin Pump with Control-IQ Technology in Children, Adolescents, and Young Adults with Type 1 Diabetes: A Systematic Review
No full textThe second author name was incorrectly published as Giula Maria Smylie. The correct name is Giulia Marie Smylie. The original article has been corrected
Threefold translation of the body of Christ: concepts of the Eucharist and the body translated in the early modern missionary context
No full textFlüchter A, Nardini G. Threefold translation of the body of Christ: concepts of the Eucharist and the body translated in the early modern missionary context. Humanties & social sciences communication. 2020;7.This article tests the usefulness of concepts from translation studies to understand the dynamics and mechanisms of cultural translation. It asks what is happening when people translate. What do they do when they translate? From a historical perspective, we apply translation theories as analytical kit on the cultural translation process created by the Jesuit missionaries teaching the Eucharist in contact zones during early modern times. In a first part, we present the conceptual tool box borrowed from translation studies (Lefevere, Venuti, Nida). In the analytical part, we apply this instrument to Jesuit translation: How did the Jesuits translate the concept of body in the sacrament of Eucharist for a general audience in the multilingual and transcultural missionary contexts? It is generally difficult to transfer knowledge by translation. The translation of the Eucharist is not only difficult regarding the aim of a true translation, its fidelity to the source, but it can become a question of orthodoxy or heresy. The translation of Eucharist concerns the theology of transubstantiation, real presence or a symbolic understanding of the body; a crucial topic in the early modern European context. The semantics of the body are closely related to this theological issue as are the different cultural practices and understanding of them, particularly in non-European cultural settings. In this Jesuit case study, the dynamics of the cultural translation process are unearthed: Which methods and technics did missionaries apply to translate theological concepts? How did they accommodate and negotiate the knowledge transfer with the local cultural grids? How did they create dynamic equivalence in order to be understood? To what degree was the translation adopted by the intended audience? With the developed tool kit we unravel a complex, multi-layered translating process that was influenced by the translator, the audience, the cultural and linguistic context as well as the power asymmetries inherent to the process
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