Search results for "APR"
showing 10 items of 2648 documents
Synthesis and degradation of poly (2-hydroxyethyl methacrylate)-graft-poly (ε-caprolactone) copolymers
2004
Abstract Poly (e-caprolactone) macromonomers carrying a methacryloyl end groups were synthesized using different lanthanide derivatives as catalysts, and characterized by SEC and 1 H NMR. Hydrophilic–hydrophobic copolymers from macromonomers and 2-hydroxyethyl methacrylate (HEMA) were obtained by solution free radical polymerization. Depending on the feed ratio of the two components, different copolymer structures were obtained. The expected graft structure of the copolymers was confirmed by 1 H NMR. Thermal properties of the copolymers were determined by DSC and TGA. Hydrolytic and enzymatic degradations of the materials were performed. Poly (2-hydroxyethyl methacrylate)- graft -poly (e-ca…
Calibration of a thermoluminescent dosimeter worn over lead aprons in fluoroscopy guided procedures
2018
Fluoroscopy guided interventional procedures provide remarkable benefits to patients. However, medical staff working near the scattered radiation field may be exposed to high cumulative equivalent doses, thus requiring shielding devices such as lead aprons and thyroid collars. In this situation, it remains an acceptable practice to derive equivalent doses to the eye lenses or other unprotected soft tissues with a dosimeter placed above these protective devices. Nevertheless, the radiation backscattered by the lead shield differs from that generated during dosimeter calibration with a water phantom. In this study, a passive personal thermoluminescent dosimeter (TLD) was modelled by means of …
Polycaprolactone/gelatin-based scaffolds with tailored performance: in vitro and in vivo validation
2019
Abstract Nanofibrous scaffolds composed of polycaprolactone (PCL) and gelatin (Ge) were obtained through a hydrolytic assisted electrospinning process. The PCL-to-Ge proportion (100/0 to 20/80), as well as the dissolution time (24, 48, 72, 96, 120 h) into a 1:1 formic/acetic acid solvent before electrospinning were modified to obtain the different samples. A strong influence of these factors on the physicochemical properties of the scaffolds was observed. Higher Ge percentage reduced crystallinity, allowed a uniform morphology and increased water contact angle. The increase in the dissolution time considerably reduced the molar mass and, subsequently, fibre diameter and crystallinity were a…
Assessing the competence learning to learn: a methodological proposal
2012
En este artículo se presenta un procedimiento para diseñar instrumentos para evaluar la competencia de Aprender a Aprender. Analizamos la secuencia de trabajo y los conceptos implicados. Se trata de una línea de trabajo que pretende diseñar instrumentos de evaluación referidos a estándares, para evaluar las competencias básicas en la educación obligatoria, y las genéricas o transversales en las titulaciones de grado universitarias (el sistema de instrumentos para universitarios se denomina ESCOGE). Se ilustra la reflexión acerca de esta propuesta con la definición teórica realizada para el diseño de instrumentos que permitan evaluar esta competencia en egresados universitarios del área de C…
Los efectos a largo plazo de las competencias emocionales y la autoestima sobre los síntomas internalizantes de los adolescentes
2021
Internalizing symptoms such as depressive mood, somatic complaints and anxiety among adolescents are a major and global concern for parents, educators and professionals. Empirical research suggests that high level of self-esteem during adolescents is associated with psychological adjustment and emotional well-being. This study examines self-esteem as a potential mediator in the interplay between emotional competencies and internalizing symptoms during adolescence. Self-report data from 855 Spanish adolescents (Mage = 13.6, SD = 1.09, 52% girls) were collected in two waves, using a longitudinal design. The mediation model was estimated using structural equation modelling (SEM). Results show …
Co-participation in Oral Paired Interviews: Preliminary Findings of the OPENPAU Project
2015
Abstract The Ministry of Education is changing how Spanish University Entrance Examination (PAU) will be delivered in 2017. To test the construct, experimental oral interviews with potential candidates of the PAU were done. Purpose of Study: The research observed whether paired interviews favored the delivery and organization of the PAU test and if this type of delivery favors the students’ performance. This paper studies how students in paired interviews outperform the individual. Sources of Evidence: About ten interviews were delivered in the US and about 40 in Spain. They all were recorded and analyzed from the interaction and output quality. Analysis and results: The study indicates tha…
The QELtLCUS questionnaire : an instrument for evaluating the learning to learn competence in university students
2021
La competencia 'aprender a aprender' es una competencia clave que la Comisión Europea (CE, 2006 y 2018) fijó para los sistemas educativos. Para su incorporación al diseño curricular y a los procesos de enseñanza-aprendizaje es ineludible disponer de instrumentos de evaluación rigurosos. Este trabajo se centra en el diseño y validación de un cuestionario cuantitativo estandarizado para evaluar su adquisición en estudiantes universitarios, dadas las limitaciones de los actualmente disponibles. Para ello se hizo uso de un diseño de validación de pruebas. Se utilizó una muestra de 1237 alumnos universitarios de tres universidades valencianas. Los resultados de consistencia interna y validez de …
Kolorektālā vēža skrīninga efektivitātes uzlabošanas iespējas Latvijā
2016
Elektroniskā versija nesatur pielikumus
Smēķēšanas izraisīto agrīno patoloģisko pārmaiņu novērtēšana plaušās un to saistība ar hroniskas obstruktīvas plaušu slimības kandidātgēnu polimorfis…
2015
Elektroniskā versija nesatur pielikumus
Koronāro artēriju bifurkāciju bojājumu invazīvās ārstēšanas stratēģija
2015
Elektroniskā versija nesatur pielikumus