1,207 research outputs found
A modelling framework for EBUS: from seasonal to decadal time scales
Get PDFAlong major Eastern Boundary Upwelling Systems (EBUS) local and seasonal changes in the equatorward wind stress (e.g. Ekman Upwelling) and cross-shore gradients of the wind (e.g. Ekman Pumping) are the main drivers of the three dimensional ocean circulation that controls coastal sea surface temperature (SST) and the upwelling of ocean tracers (e.g. nutrients). Through modulation of these local conditions, also climate modes seem to have an impact on upwelling, regulating the EBUS variability at interannual and decadal timescales.
In light of the importance of the forcing, in a ocean modelling framework, the aims of this thesis are to understand the impact of different wind structures on the dynamics of SST and upwelling and, to detect and compare low-frequency variability and changes in EBUS. To achieve these objectives we performed long-term ocean hindcasts with the global ORCA025 configuration (25 km of horizontal resolution) of NEMO general circulation model forced by three atmospheric products, that differ for spatial resolution. The numerical results suggest that (1) coastal upwelling and Ekman pumping are locally forced by differences in alongshore wind stress and wind stress curl, respectively; (2) equatorward currents are intensified under enhanced wind stress condition, while poleward undercurrents respond to wind stress curl changes; (3) SST differences are mostly related to a stronger nearshore wind stress rather than incoming heat fluxes (4) global covariability across EBUS is not detected, at basin scale the El Niño–Southern Oscillation and its low frequency modulation exert influence on Pacific systems while the Atlantic Meridional Oscillation is the predominant mode over Atlantic domains
The bulk parameterizations of turbulent air-sea fluxes in NEMO4: the origin of Sea Surface Temperature differences in a global model study
No full textThis repository contains the code and the data used to produce the results of "The bulk parameterizations of turbulent air-sea fluxes in NEMO4: the origin of Sea Surface Temperature differences in a global model study" a discussion paper by G. Bonino, D. Iovino, L. Brodeau, S. Masina submitted to Geoscientific Model Development.
- DATA.tar contains the 5 days model outputs to produce the figures in the manuscript.
- CODE.tar contains the code and the namelists to run the experiments. The namelists and the modified code for run each experiments are available in the subfolder CODE/cfgs/
Giulia Veronica Varisco
No full textThe headword explains the biography and the contribution of the author Giulia Varisco to the children's literatur
Architectural Maquette. From Digital Fabrication to AR Experiences
Get PDFWith this paper, the authors want to reflect on how, in the age of the immaterial, a plastic model is a tool still current in the representation and able to connect with the new digital tools of augmented reality (AR). In this context, we would like to present a practical case concerning the realization of two static scale models, realized through Digital Fabrication technologies, aiming to increase the accessibility to knowledge about the architectural project in an exhibition context.
The final goal of this work is to develop a methodology that allows the user to obtain information about the architectural project not only through the real model but also through static and dynamic virtual models overlaid using the current AR technologies. In particular, the following tools were used for tracking: Unity®, a multiplatform graphics engine, and Vuforia®, an augmented reality software development kit
Southern Europe and Western Asia Marine Heat Waves (SEWA-MHWs): a dataset based on macro events
No full textThis repository contains the SEWA-MHWs dataset, which consists in daily fields of marine heatwaves (MHWs) macro events and their characteristics over Southern Europe and Western Asia. The SEWA-MHWs dataset is derived from the European Space Agency (ESA) Climate Change Initiative (CCI) Sea Surface Temperature (SST) v2 dataset and it covers the 1981-2016 period. This dataset is presented and described in details in the "Southern Europe and Western Asia Marine Heat Waves (SEWA-MHWs): a dataset based on macro events" manuscript by Giulia Bonino, Simona Masina, Giuliano Galimberti and Matteo Moretti submitted to Earth System Science Data journal.
This repository contains:
A) SEWA_labels.nc: daily fields of labels. Each unique label represents a macro event.
Moreover, we extracted for all the grid points belonging to a given macro event, the MHWs characteristics and we obtained daily fields of MHWs characteristics:
B) SEWA_IndStart.nc: daily fields of MHWs index start.
C) SEWA_IndPeak.nc: daily fields of MHWs index peak.
D) SEWA_IndEND.nc: daily fields of MHWs index end.
E) SEWA_Category.nc: daily fields of MHWs categories.
F) SEWA_IntMAx.nc: daily fields of MHWs maximum intensity.
G) SEWA_IntMean.nc: daily fields of MHWs mean intensity.This research has been funded by the European Space Agency (ESA) as part of the FEVERSEA Climate Change Initiative (CCI) fellowship (ESA ESRIN/Contract No. 4000133282/20/I/NB)
Ytterbium Disilicate/Monosilicate Multilayer Environmental Barrier Coatings: Influence of Atmospheric Plasma Spray Parameters on Composition and Microstructure
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Open AccessArticle
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
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
Get PDFThe second author name was incorrectly published as Giula Maria Smylie. The correct name is Giulia Marie Smylie. The original article has been corrected
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