Ytterbium Disilicate/Monosilicate Multilayer Environmental Barrier Coatings: Influence of Atmospheric Plasma Spray Parameters on Composition and Microstructure

first_pagesettingsOrder Article Reprints 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 Downloadkeyboard_arrow_down Browse Figures Review Reports Versions Notes 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

New family host and records of Acanthocrios furnarii (Cordero & Vogelsang, 1928) (Hemiptera: Cimicidae) from Argentina, and implications in the transmission mechanism of cimicid bugs among birds’ nests

Acanthocrios furnarii (Cordero & Vogelsang, 1928) [Hemiptera: Cimicidae: Haematosiphoninae] is an ectoparasite on avian hosts from Argentina and Uruguay. It has been mostly found in mud nests of Furnarius rufus (Gmelin, 1788) [Aves: Furnariidae], but its true hosts are some of the inquiline birds that use F. rufus nests. These inquiline hosts belong to the families Emberizidae, Hirundinidae, Icteridae, Passeridae, and Troglodytidae. Outside F. rufus mud nests, A. furnarii has been found in nests of other Furnariidae, Hirundinidae, and Passeridae. The present work adds the first nonpasserine host (Falconidae) of A. furnarii, together with new records in La Pampa, Argentina. The transmission mechanism of A. furnarii, together with all other cimicid bugs from Argentina and adjacent countries, is increased considering this new host; and we also take into account the birds that nidificate in nest boxes, the cavity-nesting birds in trees and earth, and the inquiline birds in stick nests of Furnariidae and Psittacidae.Fil: Di Iorio, Osvaldo Rubén. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Biodiversidad y Biología Experimental. Laboratorio de Entomología; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Turienzo, Paola Noemí. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Biodiversidad y Biología Experimental. Laboratorio de Entomología; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Bragagnolo, Laura Araceli. Universidad Nacional de La Pampa. Facultad de Ciencia Exactas y Naturales. Departamento de Recursos Naturales. Centro para el Estudio y Conservación de Aves Rapaces; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Santillán, Miguel Ángel. Universidad Nacional de La Pampa. Facultad de Ciencia Exactas y Naturales. Departamento de Recursos Naturales. Centro para el Estudio y Conservación de Aves Rapaces; ArgentinaFil: Grande, Juan Manuel. Universidad Nacional de La Pampa. Facultad de Ciencia Exactas y Naturales. Departamento de Recursos Naturales. Centro para el Estudio y Conservación de Aves Rapaces; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Ciencias de la Tierra y Ambientales de La Pampa. Universidad Nacional de La Pampa. Facultad de Ciencias Exactas y Naturales. Instituto de Ciencias de la Tierra y Ambientales de La Pampa; Argentin

Comparison of Monocyte Distribution Width (MDW) and Procalcitonin for early recognition of sepsis

We carried out a prospective observational study to evaluate whether Monocyte Distribution Width (MDW) may play a role in identifying patients with sepsis in comparison with Procalcitonin (PCT). We prospectively enrolled all consecutive patients hospitalized at the Infectious Diseases Unit of Pescara General Hospital for bacterial infection or sepsis. MDW values were collected for all patients. Clinical characteristics, demographic data, past and present medical history, microbiological results, PCT, as well as neutrophil and monocytes indices at entry were compared in the 2 groups. Two-hundred-sixty patients were enrolled, 63.5% males, aged 59.1±19.5 years. Sepsis was diagnosed in 105 (40.4%); in 60 (57.1%) at least 1 microorganism was isolated from blood cultures. In multivariate models, MDW as a continuous variable (OR:1.57 for each unit increase; 95%CI: 1.31-1.87, p<0.001) and PCT˃1 ng/mL (OR: 48.5; 95%CI: 14.7-160.1, p<0.001) were independently associated with sepsis. Statistical best cut points associated with sepsis were 22.0 for MDW and 1.0 ng/mL for PCT whereas MDW values<20 were invariably associated with negative blood cultures. At ROC curve analysis, the AUC of MDW (0.87) was nearly overlapping that of PCT (0.88). Our data suggest that incorporating MDW within current routine WBC counts and indices may be of remarkable use for detection of sepsis. Further research is warranted

Biogenic Aerosol in the Artic from Eight Years of MSA Data from Ny Ålesund (Svalbard Islands) and Thule (Greenland)

In remote marine areas, biogenic productivity and atmospheric particulate are coupled through dimethylsulfide (DMS) emission by phytoplankton. Once in the atmosphere, the gaseous DMS is oxidized to produce H2SO4 and methanesulfonic acid (MSA); both species can a ect the formation of cloud condensation nuclei. This study analyses eight years of biogenic aerosol evolution and variability at two Arctic sites: Thule (76.5 N, 68.8 W) and Ny Ålesund (78.9 N, 11.9 E). Sea ice plays a key role in determining the MSA concentration in polar regions. At the beginning of the melting season, in April, up to June, the biogenic aerosol concentration appears inversely correlated with sea ice extent and area, and positively correlated with the extent of the ice-free area in the marginal ice zone (IF-MIZ). The upper ocean stratification induced by sea ice melting might have a role in these correlations, since the springtime formation of this surface layer regulates the accumulation of phytoplankton and nutrients, allowing the DMS to escape from the sea to the atmosphere. The multiyear analysis reveals a progressive decrease in MSA concentration in May at Thule and an increase in July August at Ny Ålesund. Therefore, while the MSA seasonal evolution is mainly related with the sea ice retreat in April, May, and June, the IF-MIZ extent appears as the main factor a ecting the longer-term behavior of MSA.MIUR PRIN 2007 and PRIN 2009, PNRA 2010-2012, PNRA 2015-2016, PNRA 2016-2018Publishedid 3495A. Ricerche polari e paleoclimaJCR Journa

The potential role of advanced glycation end products in food allergy pathogenesis

prevalence has dramatically increased in the last two decades. Among dietary factors, it has been hypothesized that advanced glycation endproducts(AGEs), present at high level in junk food, could be involved in FA pathogenesis. AGEs are a heterogeneous group of compounds deriving from sugars(sweets and beverages), autoclaved/processed foods, microwaved foods, more roasted/barbecued meat. To evaluate the AGEs levels in FA children compared with healthy controls and subjects with respiratory allergy. Methods: We evaluated paediatric patients with challenge-proven FA, children with respiratory allergy(RA) and age and sex-matched healthy controls. Subcutaneous AGEs levels were evaluated through the AGE reader. Food-frequency questionnaires were evaluated in all study subjects. In vitro studies were performed on human enterocytes(Caco-2 cells) stimulated with 200 mg/ml of BSA-AGE for 24and48 hours to evaluate effects on gut barrier function: mucin2(mucus production), transpithelial electrical resistance(TEER), ZO-1, occludin expression(intestinal permeability). The direct effects elicited on peripheral blood mononuclear cells (PBMCs) after the treatment with 200 mg/ml of BSA-AGE for 48hours, 4and 7days of treatment were also evaluated. RESULTS: 115 subjects were evaluated and subdivided into 3 groups: group 1 patients with FA (n=31); group 2 patients with RA (n=18), group 3 healthy controls (n=66). The consumption of food containing AGEs was higher in subjects with FA compared to RA children and healthy controls (p<0.05). FA and RA children presented significant higher subcutaneous AGEs levels compared to healthy controls (p<0.05). Linear regression analysis confirmed a significant positive correlation between subcutaneous levels of AGEs and consumption of food containing AGEs. Human enterocytes exposed to BSA-AGE treatment showed a reduction of TEER, of Muc2 and tight junction proteins (Occludin and ZO-1). Moreover, the treatment with BSA-AGE on human PBMCs stimulates pro-inflammatory cytokines TNF-α and Th2 cytokines(IL-5 and IL-13)production , but it was unable to modulate IL-10 production. Finally, after7days of treatment with BSAAGE, we found a low percentage of proliferating CD4+T. CONCLUSIONS: Current hypotheses and models of FA do not adequately explain the dramatic increase observed in the last years

Crecimiento y desarrollo de niñas y niños que viven en entornos carcelarios de la provincia de Buenos Aires, Argentina

Objetivos: Examinar el estado nutricional, el desarrollo psicomotor y socioemocional de niñas y niños (a partir de ahora niños) que viven con sus madres en la Unidad Penal N° 33 de la provincia de Buenos Aires, Argentina. Materiales y métodos: Se registraron el sexo, la edad, el peso y la estatura de los niños (37) residentes con sus madres (28) en la Unidad Criminal No. 33 del SPB. Se calcularon los indicadores nutricionales y se analizaron según la referencia internacional de la Organización Mundial de la Salud (WHO/OMS) de 2006. Se evaluó el desarrollo infantil con la Prueba Nacional de Pesquisa (PRUNAPE) y el cuestionario socioemocional Ages and Stages Questionnaires: Socio-Emotional®, Second Edition (ASQ:SE-2). Resultados: En la evaluación antropométrica se identificó: en menores de dos años, el 7% con bajo peso, el 3% con alerta de bajo peso, el 28% con alto peso y el 14% con baja talla. En mayores de dos años, el 37,5% tienen alto peso; y el 25%, riesgo de sobrepeso. No se encontró baja talla. En las pruebas PRUNAPE y ASQ:SE-2, de los 30 casos que completaron ambas pruebas, el 53,3% obtuvo puntuaciones dentro de lo esperado. En el grupo con ambas pruebas que no pasaron la PRUNAPE (n=9), el resultado encontrado en el ASQ:SE-2 fue que el 66,6% se hallaba dentro de las expectativas, y el 33,3%, en riesgo. En el grupo de niños con ambas pruebas que no pasaron el ASQ:SE-2, ninguno resolvió la PRUNAPE. Conclusión: Se registraron prevalencias elevadas de exceso de peso y altos porcentajes de riesgo en el desarrollo psicomotor, considerablemente superiores que en la población general. Se plantea la necesidad de acciones que disminuyan el efecto nocivo del internamiento en la infancia.Objectives: The objective of this study was to examine nutritional status, psychomotor and socioemotional development of children living with mothers in prison in the province of Buenos Aires, Argentina. Materials and methods: Sex, age, weight and height were measured in children (37) residents with their mothers (28) in the Criminal Unit No. 33 of the SPB. Nutritional indicators were calculated and analyzed according to the WHO international reference (2006). National Research Test (PRUNAPE) and the parental questionnaire Ages and Stages Questionnaires: SocioEmotional®, Second Edition (ASQ:SE-2) were applied to evaluate development. Results: Anthropometric evaluation showed that 7% of children under 2 years presented low weight, 3% alert of low weight, 28% high weight and 14% low height. Children over 2 years of age showed 37.5% of high weight and 25% of risk of overweight. There were no children with short stature. PRUNAPE and ASQ:SE-2 tests: in the 30 cases that completed both tests more than half (53.3%) obtained scores within the expected. In the group of children with both tests who did not pass the PRUNAPE (n = 9), the result found in the ASQ-SE 2 was diverse: 66.6% is within the expectations and 33.3% at risk. Neither of children with both tests that did not pass the ASQ:SE-2, passed the PRUNAPE. Conclussion: There were high prevalences of excess weight and high percentages of risk in psychomotor development, considerably higher than in the general population. There is a need to carry out actions to reduce the harmful effect of childhood confinement

Collaborative Practices and Multidisciplinary Research : The Dialogue Between Entrepreneurship, Management, and Data Science

Author's accepted version (post-print).Available from 06/06/2020.acceptedVersio