Motivación y disponibilidad de recursos de los estudiantes en la enseñanza online derivada de la crisis sanitaria COVID-19

p. 1619-1639La universidad lleva, desde hace varias décadas, incorporando los sistemas de enseñanza semipresencial y online, aprovechando las ventajas que ofrecen las llamadas tecnologías de la información. El cambio en el sistema de enseñanza, sin embargo, no debe ser fruto únicamente de la incorporación de los recursos tecnológicos. Los modelos pedagógicos también deben ser adaptados. La situación de enseñanza no presencial a la que la universidad española se vio obligada a enfrentarse de forma drástica en marzo de 2020, fruto de la crisis sanitaria derivada del COVID-19, puso en evidencia esta situación: ¿estaban tanto el propio sistema como nuestros profesores y alumnos preparados para este cambio? En el presente estudio se analiza esta realidad desde la perspectiva de los propios alumnos, considerando variables como la motivación, la atención en las clases, la expresión oral o la disponibilidad de recurso

Propiedades físico-mecánicas en muros de ladrillo artesanal adicionando ceniza de algodón-hoja de palmera datilera, Ica-2022

En la presente investigación se tuvo como objetivo general evaluar cómo influye la adición de ceniza de algodón-hoja de palmera datilera en las propiedades físicomecánicas en muros de ladrillo artesanal , en donde se realizaron los ensayos de variación dimensional, alabeo, absorción, succión, resistencia a la compresión simple, axial y diagonal con 4 dosificaciones diferentes de ceniza de tallo de algodón (CTA) y de hoja de palmera datilera (CHPD) con una adición en la elaboración de los ladrillos artesanales en porcentajes de 0.5%, 0.8%, 1.2% y 1.5% con respecto al peso de la unidad seca de una unidad de albañilería artesanal. Para desarrollar la investigación se utilizó la siguiente metodología; el de tipo aplicada con un diseño de investigación cuasi-experimental y un enfoque cuantitativo. La población está constituida por un conjunto de 882 ladrillos y una muestra de 392 ensayos. Los resultados muestran un cumplimiento de la norma E.070 con respecto a las propiedades físicas y con respecto a las propiedades mecánicas se aprecia un aumento de la resistencia a la compresión por unidad, axial y diagonal al adicionar un 0.5% de ceniza de tallo de algodón y de hoja de palmera datilera; sin embargo, al seguir aumentado el porcentaje de estas cenizas las resistencias empiezan a disminuir. De esta investigación se llegó a la conclusión general que la ceniza de tallo de algodón y de hoja de palmera datilera influyen favorablemente en las propiedades mecánicas en un porcentaje de 0.5% de adición en un muro de ladrillo artesana

Traction test of temporary dental cements

Classic self-curing temporary cements obstruct the translucence of provisional restorations. New dual-cure esthetic temporary cements need investigation and comparison with classic cements to ensure that they are equally retentive and provide adequate translucence. The objective is to analyze by means of traction testing in a in vitro study the retention of five temporary cements. Ten molars were prepared and ten provisional resin restorations were fabricated using CAD-CAM technology (n=10). Five temporary cements were selected: self-curing temporary cements, Dycal (D), Temp Bond (TB), Temp Bond Non Eugenol (TBNE); dual-curing esthetic cements Temp Bond Clear (TBC) and Telio CS link (TE). Each sample underwent traction testing, both with thermocycling (190 cycles at 5-55º) and without thermocycling. TE and TBC obtained the highest traction resistance values. Thermocycling reduced the resistance of all cements except TBC. The dual-cure esthetic cements tested provided optimum outcomes for bonding provisional restorations

Methodology in specimen fabrication for in vitro dental studies : standardization of extracted tooth preparation

Specimen preparation for in vitro study suffers a general lack of methodological homogeneity, as well as a lack of uniformity in the materials selected for fabricating them. This situation prevents comparisons between studies. When a specimen is not of dental origin it is not possible to study adhesion or bonding techniques realistically. The objective is to design and implement a method of specimen preparation that permits universal standardization for use in in vitro studies. A metal stump of specified dimensions was designed and fabricated by hand. It was scanned, the data digitalized, perfecting and standardizing the dimensions. Ten human molars were adapted to the size and shape of a standard milling block. A Cerec 3D inLab Cerec milling unit was used to prepare the molars to match the digitalized model. Ten specimens with identical dimensions were obtained. CAD-CAM technology allows the preparation of natural extracted teeth to be standardized and could be used to establish a reproducible method that would facilitate comparison between different in vitro studies, and reduce bias arising from variations in sample fabrication

Implementing ARP-Path Low Latency Bridges in NetFPGA

The demo is focused on the implementation of ARP-Path (a.k.a. FastPath) bridges, a recently proposed concept for low latency bridges. ARP-Path Bridges rely on the race between broadcast ARP Request packets, to discover the minimum latency path to the destination host. Several implementations (in Omnet++, Linux, OpenFlow, NetFPGA) have shown that ARP-Path exhibits loop-freedom, does not block links, is fully transparent to hosts and neither needs a spanning tree protocol to prevent loops nor a link state protocol to obtain low latency paths. This demo compares our hardware implementation on NetFPGA to bridges running STP, showing that ARP-Path finds lower latency paths than STP

A Simple, Zero-configuration, Low Latency, Bridging Protocol

This paper describes a demo for a new type of bridges, ARP-Path bridges. These ARP-based Ethernet Switches rely on the race between ARP Request packets flooded over all links, to discover the minimum latency path to the destination host. The protocol uses all links, is loop free, uses the standard Ethernet frame format, is fully transparent to hosts and neither needs a spanning tree protocol to prevent loops nor a links state protocol to obtain minimum latency paths. Implementations in Linux and Openflow on NetFPGA show inherent robustness and fast reconfiguration. Simulation results show throughput and delay performance superior to the Spanning Tree Protocol and similar to shortest path routing, with lower complexity.Comunidad de MadridJunta de Comunidades de Castilla-La Manch

A Simple, Zero-configuration, Low Latency, Bridging Protocol

This paper describes a demo for a new type of bridges, ARP-Path bridges. These ARP-based Ethernet Switches rely on the race between ARP Request packets flooded over all links, to discover the minimum latency path to the destination host. The protocol uses all links, is loop free, uses the standard Ethernet frame format, is fully transparent to hosts and neither needs a spanning tree protocol to prevent loops nor a links state protocol to obtain minimum latency paths. Implementations in Linux and Openflow on NetFPGA show inherent robustness and fast reconfiguration. Simulation results show throughput and delay performance superior to the Spanning Tree Protocol and similar to shortest path routing, with lower complexity

A terapia antiplaquetária na alta hospitalar e prognóstico a longo prazo na síndrome de Takotsubo: dados do Registro Nacional Espanhol (RETAKO)

Síndrome de Takotsubo; Disfunción endotelial; Tratamiento antiplaquetarioSíndrome de Takotsubo; Disfunció endotelial; Tractament antiplaquetariTakotsubo syndrome; Endothelial dysfunction; Antiplatelet treatmentIntroduction Endothelial dysfunction and platelet activation have been highlighted as possible mediators in Takotsubo syndrome (TTS). Nevertheless, to date, evidence on the usefulness of antiplatelet therapy in TTS remains controversial. The aim of our study is to evaluate long-term prognosis in TTS patients treated with antiplatelet therapy (APT) at hospitalization discharge. Material and methods An ambispective cohort study from the Spanish National Takotsubo Registry database was performed (June 2002 to March 2017). Patients were divided into two groups: those who received APT at hospital discharge (APT cohort) and those who did not (non-APT cohort). Primary endpoint was all-cause death. Secondary endpoints included the composite of recurrence or readmission and a composite of death, recurrence or readmission. Results From a total of 741 patients, 728 patients were alive at discharge. Follow-up was performed in 544 patients, who were included in the final analysis: 321 patients (59.0%) in the APT cohort and 223 patients (41.0%) in the non-APT cohort. The APT cohort had a better clinical presentation and received more heart failure and acute coronary syndrome-like therapies (angiotensin converting enzyme inhibitors/angiotensin receptor blockers: 75.1% vs. 51.1%; p<0.001, betablockers: 71.3% vs. 50.7%; p<0.001, statins: 67.9% vs. 33.2%; p<0.001). After adjusting for confounder factors, APT at discharge was a protective factor for all-cause death (adjusted hazard ratio (HR) 0.315, 95% confidence interval (CI): 0.106-0.943; p=0.039) and the composite endpoint of all-cause death, recurrence or readmission (adjusted HR 0.318, 95% CI: 0.164-0.619; p=0.001) at month 25 of follow-up. Conclusion Patients with TTS receiving APT at discharge presented better prognosis up to two-years of follow-up compared with their counterparts not receiving APT

Cistoadenoma seroso "gigante" de ovario en una adolescente. Serum giant ovarian cystoadenoma in an adolescent

Se presenta el caso de una adolescente de 16 años de edad con antecedentes de haber sido operada a los 5 años por Persistencia del Conducto Arterioso, que ingresa en el Hospital Pediátrico Provincial Docente "Pepe Portilla" de Pinar del Río, Cuba, por dolor torácico irradiado al brazo derecho y aumento de volumen del abdomen, por lo que se indicó ultrasonido abdominal detectándose gran masa quística abdominal. Es trasladada al Servicio de Cirugía Pediátrica, donde se completa su estudio y se realiza intervención quirúrgica, encontrándose un quiste gigante de ovario derecho que pesó 9 kilogramos, corroborándose el diagnóstico histológico de Cistoadenoma Seroso de Ovario (Quiste Seroso Simple). La paciente evolucionó satisfactoriamente. Los autores presentan las experiencias derivadas de la atención del caso, y revisan la literatura médica sobre el tema con especial referencia al diagnóstico y tratamiento. Palabras clave: Edema Masivo de Ovario, Quiste de Ovario. ABSTRACT A 16-year-old case of an adolescent is presented, having undergone a surgical procedure at 5 years old because of an arterious duct patency, being admitted at "Pepe Portilla" Provincial Teaching Pediatric Hospital in Pinar del Río, Cuba, presenting chest pain with radiation to the right arm and increase of the abdominal volume and an abdominal ultrasound was prescribed and it was detected a great abdominal cystic mass. She was transferred to the Pediatric Surgical Service, and the study is completed, and she undergoes a surgical procedure, finding a 9-kilogram giant right ovarian cyst which was proved in the histological diagnosis to be a Serum Ovarian Cystoadenoma (Simple Serum Cyst) The patient had a succesful recovery. The authors present the experiences attained and review the medical literature on this case, making emphasis on its diagnosis and treatment. Key words: MASS OVARIAN EDEMA, OVARIAN CYST

Malnutrition According to GLIM Criteria Is Associated with Mortality and Hospitalizations in Rehabilitation Patients with Stable Chronic Obstructive Pulmonary Disease

Malnutrition has a negative impact on patients with chronic pulmonary obstructive disease (COPD). The purpose of this study was to assess the prevalence of malnutrition, defined by the Global Leadership Initiative for Malnutrition (GLIM), in stable COPD patients referred to pulmonary rehabilitation, and to explore potential associations of malnutrition according to GLIM, and its components, with increased risk of mortality and hospitalizations in 2 years. In a post-hoc analysis of a prospective cohort of 200 rehabilitation patients with stable COPD, main outcome variables were hospital admissions, length of stay, and mortality during a 2-year follow-up. Covariates were malnutrition according to GLIM and its phenotypic criteria: unintentional weight loss, low body mass index (BMI), and low fat-free mass (FFM). Univariate and multivariate analysis were performed using logistic and proportional hazard Cox regression. Malnutrition according to GLIM showed 45% prevalence and was associated with increased mortality risk. Low age-related BMI and FFM were independently associated with mortality, which persisted after adjustment for age and lung function. Malnutrition and low BMI were also associated with increased risk of hospitalization. Malnutrition according to GLIM criteria was highly prevalent in rehabilitation patients with COPD and was associated with nearly 3 times greater mortality and hospitalization risk