Suchergebnisse

Se trata de una paciente lactante menor de 3 meses de edad que contaba como antecedentes el ser producto del primer embarazo, no controlado, de madre de 29 años, finalizando en parto vaginal intradomiciliario. Se desconoce el peso al nacimiento y se refiere cianosis desde el nacimiento. La niña fue alimentada con fórmula láctea artificial y se desconoce su esquema de vacunación. Tuvo un encarne en otro hospital al mes de edad por neumonía, donde se le dio tratamiento con digoxina y diurético, mismos que la madre. Suspendió por iniciativa propia.
A su ingreso al hospital (5-nov-96), la madre refirió una evolución de 24 horas con tos no productiva, polipnea, anorexia y cianosis generalizada. A la exploración física se encontró un peso de 3,260 g, talla de 53 cm y perímetro cefálico de 34.5 cm (todos por debajo del 5º percentil para su edad), una temperatura de 37.5 "C, frecuencia cardiaca 160 x minuto, frecuencia resp. 52 x minuto y presión arterial media de 60 mmHg (flush). Se observó en malas condiciones generales, hipoactiva, con cianosis de piel y mucosas, faringe hiperémica (++), tórax con cinética ventilatoria normal, campos pulmonares con estertores crepitantes finos bilaterales, precordio hiper dinámico, soplo sistólico expulsivo grado IVNI, en borde esternal izquierdo, hepatomegalia de 6 cm por debajo del reborde costal, extremidades adelgazadas, pulsos periféricos amplios y simétricos, reactiva a estímulos externos.
Los estudios de ingreso (5-nov-96) mostraron biometría hemática con Hb:13.5 mg/dl, Hcto: 42.8%, leucocitos 19,000, linfocitos: 57%, granulocitos: 40%, bandas: 2%. La química sanguínea, electrólitos séricos y examen general de orina se reportaron normales para su edad. El electrocardiograma mostró taquicardia sinusal con frecuencia ventricular de 166 x', eje de QRS a+ 90", voltaje de QRS isodinámico y prominente en Dl, AVL, V2 a V5 sugestivo de hipertrofia bi ventricular.

Water and waterborne decay agents (e.g. salts, microorganisms) are commonly associated with undesired alterations and damages on concrete elements. A strategy to mitigate their impact is to decrease water retention in the material either by surface treatments or admixtures. In this work, hydrophobic concretes were developed by the addition of a hydrophobic sol containing TEOS and PDMS oligomers, synthetized by a surfactant-assisted sol-gel route, either as an admixture or as a surface treatment. The hydrophobic performance was similar for both application modes (>70% capillary absorption reduction) and higher than concrete containing a commercial (calcium stearate) admixture or a nanosilica-based hydrophobic coating. Addition as an admixture led to a higher durability in the rain and abrasion tests. The hydrophobic sol as an admixture promotes an increase of surface roughness and porosity, as well as the formation of C–S–H like reaction products with the cement matrix components, as evidenced by AFM, MIP, SEM and FTIR. Despite the higher porosity, impact resistance and material cohesion were not negatively affected respect to the plain concrete. Application as a surface treatment decreased porosity and led to a higher amorphous SiO2 content. The material cohesion and impact resistance was increased by this application, although penetration was limited to the first 4 mm and the hydrophobic properties were more susceptible to mechanical damages to the surface. © 2021 The Authors ; This project has received funding from the European Union's Horizon 2020 - Research and Innovation Framework Programme under grant agreement No 760858; This work has been financed by the Spanish State Research Agency R&D program 2020 (Project reference: PID2020-115843RB-I00); This work has been co-financed by the European Union under the 2014-2020 ERDF Operational Programme and by the Department of Economic Transformation, Industry, Knowledge, and Universities of the Regional Government of Andalusia (Project reference: FEDER- UCA18-106613).

Despite the large photovoltaic performance recently achieved, many aspects of the working principles of hybrid organic–inorganic perovskite solar cells remain to be unveiled. We analyze the experimental features observed in the decay of photovoltage and provide an interpretation of the different depolarization regimes at distinct time scales. We introduce an instantaneous relaxation time that shows the type of relaxation for each separate mechanism. The decay of photovoltage is characterized by electronic events at the ms time scale followed by a power law relaxation in the 10–100 s time window. The latter process is associated with the slow dielectric relaxation of CH3NH3PbI3 perovskite and it points to cooperative kinetics of polarization and depolarization of ferroelectric domains. These findings provide an important tool for interpretation of kinetic features in the perovskite ferroic solar cells. ; The research leading to these results has received funding from the European Union Seventh Framework Program [FP7/2007 – 2013] under grant agreement 316494, MINECO of Spain under project MAT2013-47192-C3-1-R, Generalitat Valenciana (project ISIC/2012/008) and the National Research Foundation of Korea (NRF) grants funded by the Ministry of Science, ICT & Future Planning (MSIP) of Korea under contract no. NRF- 2012M3A6A7054861 (Global Frontier R&D Program on Center for Multiscale Energy System). HW Han and LF Liu acknowl- edge  nancial support from the National Natural Science Foundation of China (91433203, 61474049) and the Ministry of Science and Technology of China (863, SS2013AA50303).

Facing the challenges posed by the COVID-19 pandemic in the health, economy, civil society, culture, and political sectors strategies and public policies are proposed to confront the development of the pandemic and its consequences in a post-pandemic stage. After analyzing the development of COVID-19 in Cuba; we made proposals for the health sector, the economic sector, the impact of the pandemic on the change of era in Cuba; and on the importance of thinking laboratories and the creation of communities of think tanks in anticipating and seeking solutions through systematic collaboration. ; Ante los desafíos que presenta la pandemia de la COVID-19 en Cuba en los sectores de la salud, la economía, la sociedad civil, la cultura y la política se proponen estrategias y políticas públicas para enfrentar el desarrollo de la pandemia y sus consecuencias en la etapa de la post-pandemia. Tras describir el desarrollo de la COVID-19 en Cuba; se realizan propuestas en el sector de la salud, la economía, el cambio de época en la isla y en el campo de los laboratorios de pensamiento y la creación de comunidades de think tanks para idear, prever y buscar soluciones a través de una colaboración sistemática.