检索结果-南通市图书馆

SARS-CoV-2 infection in children requiring hospitalization: the experience of Navarra, Spain

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Pediatrics 2020年第6期16卷 614-622页

作者： Laura Moreno-Galarraga Maria Urretavizcaya-Martinez Josune Alegria Echauri Marcos Garcia Howard Eva Ruperez Garcia Sergio Aguilera-Albesa Valentin alzina de Aguilar Mercedes Herranz Aguirre Pediatric Pulmonology Department of PediatricsCHNComplejo Hospitalario de NavarraServicio Navarro de SaludC/Irunlarrea 331080 PamplonaSpain IdiSNA.Navarra Institute for Health Research PamplonaSpain Department of Preventive Medicine and Public Health.School of Medicine.University of Navarra Pamplona.wSpain Department of Pediatrics CHNComplejo Hospitalario de NavarraServicio Navarro de Salud.Pamplona.Spain Pediatric Cardiology Department of PediatricsCHN.Complejo Hospitalario de NavarraServicio Navarro de SaludPamplonaSpain Pediatric Neurology Department of PediatricsCHN.Complejo Hospitalario de NavarraServicio Navarro de SaludPamplonaSpain Department of Pediatrics CUN.Clfnica Universidad de NavarraPamplona.Spain Department of Pediatrics School of MedicineUniversity of NavarraPamplona.Spain

Background Coronavirus disease 2019 in children,or pediatric COVID-19,initially was described as an acute respiratory syndrome similar to the adult presentation but with less severe *** We describe the clinical characteristics,disease presentation,treatments and outcomes of all pediatric cases with COVID-19 admitted to the reference hospitals in Navarra,Spain during the first wave of the COVID-19 outbreak(February-May 2020).Results We found a low number of hospitalized cases in infants and children compared to adults with a hospitalization ratio of 1:*** of these hospitalized cases did not suffer from severe *** 80%of infections reported household contacts,and the mother was the known-contact in 83%of these cases.72%of hospitalized cases were previously healthy *** describe how symptoms in pediatric cases are nonspecific and how COVID-19 can be presented with a wide range and variety of *** symptoms are not always present,and severe neurological and cardiac features can occur in previously healthy *** Epidemiological description and case reports will be key to a better recognition and to adequate treatment of pediatric patients with COVID-19.

关键词： Coronavirus disease 2019 Hospitalization Severe acute respiratory syndrome coronavirus 2

Evaporation Kinetics and Breaking of a Thin Water Liquid Bridge between Two Plates of Silicon Wafer

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Advances in Materials Physics and Chemistry 2016年第7期6卷 157-166页

作者： Etienne Portuguez Arnaud alzina Philippe Michaud Agnès Smith Université de Limoges Limoges France

In ceramic processing, the study of the different phases of the drying stage considers the material at a macroscopic scale. Very often, the various parameters (among which the temperature and the relative humidity) are chosen in an empirical way, mostly through visual observations. This stage is governed by capillary phenomena which take place within the material, responsible for both the shrinkage and the risk of cracks which can damage the final piece. As part of a better understanding of the local mechanisms during drying, liquids contained in the pores have been reproduced in an ideal case. Drying kinetics and parameter measurements from 303 to 343 K of deionized water liquid bridges between two plates of silicon wafers are presented. Experimental work was carried out using specific device to create liquid bridges, coupled with image analysis and within an adapted instrumented climatic chamber. While the volume and the exchange surface of liquid bridges decrease regularly throughout the drying process, contact angles only diminish at the end. One of the four contact angles may have a different variation, which results in a pinned contact line in its area and reveals a local change of the surface state. From these measurements and observations, the liquid bridge break is proposed as a cracking criterion of porous materials during drying. Indeed, the challenge is to limit the risk of cracking and damaging pieces during this crucial step in material processing.

关键词： Liquid Bridge Volume Contact Angle Evaporation Drying

Evolution of a Water Pendant Droplet: Effect of Temperature and Relative Humidity

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Natural Science 2017年第1期9卷 1-20页

作者： Etienne Portuguez Arnaud alzina Philippe Michaud Maksoud Oudjedi Agnès Smith Université de Limoges SPCTS CNRS ENSCI Limoges France Université de Limoges ENSCI Limoges France

As part of a better understanding of drying liquids within porous materials, measurements from 293 to 343 K of deionized water surface tension in air as a function of relative humidity are exposed. Experimental work was carried out using the pendant drop method coupled with image analysis within an adapted instrumented climatic chamber. Results show that surface tension linearly decreases when relative humidity increases. Although the effect of humidity is less compared to that of the temperature and even less compared to a surfactant impact, it must not be neglected and values have to be mentioned when dealing with water evaporation. Modifying surface tension also affects the pendant drop shape. The drying kinetics of the pendant drop volume and its outer shell are connected to this change of shape. Steam in the air can be assimilated to a wetting agent, hence a surfactant, and can be used in an environmental-friendly way to ease the drying stage. Indeed, the challenge is to limit the risk of cracking and damaging pieces during this crucial step in material processing.

关键词： Pendant Drop Surface Tension Water Relative Humidity Temperature Drying

Study of the Contact and the Evaporation Kinetics of a Thin Water Liquid Bridge between Two Hydrophobic Plates

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Advances in Materials Physics and Chemistry 2017年第4期7卷 99-112页

作者： Etienne Portuguez Arnaud alzina Philippe Michaud Djamila Hourlier Agnès Smith Université de Limoges SPCTS CNRS ENSCI Limoges France Institut d’Electronique de Micro-électronique et de Nanotechnologie CNRS VILLENEUVE d’ASCQ France

The evaporation of sessile water droplets on hydrophobic surfaces is a topic which led to numerous investigations. However, how does the liquid behave when the evaporation occurs between two of these particular substrates? The drying stage is governed by capillary phenomena which takes place in a confined space. In the field of material shaping, it is also possible that some regions of a green body exhibit hydrophobic properties. As part of a better understanding of the local mechanisms during drying, liquid bridges have been reproduced in an ideal case. Drying kinetics and parameters measurements from 303 to 343 K (relative humidity of 55%) of deionized water liquid bridges between two plates of hydrophobic substrates are presented. Experimental work was carried out using a specific device to create liquid bridges, coupled with image analysis within an adapted instrumented climatic chamber. While the volume and the exchange surface of liquid bridges decrease regularly throughout the process, contact angles constantly diminish and more significantly at the end. This is different from the evaporation between two hydrophilic plates. From these measurements, the change of curvature of the liquid bridges during evaporation is highlighted.

关键词： Liquid Bridge Hydrophobic Substrate Volume Contact Angle Evaporation