Search results for "120"
showing 10 items of 581 documents
Development of the quality test protocol for the DEPFET pixel detectors and top-quark mass measurement at high energy e+e- colliders
2017
El Modelo Estándar (SM) es el marco teórico más preciso jamas construido, el cual incluye todas las partículas descubiertas y las interacciones entre ellas. Es el resultado de más de 100 años de investigación en física de partículas, empezando por las observaciones de J.J. Thompson de los así llamados “corpusculos”, usando un pequeño tubo de rayos catódicos; hasta el reciente descubrimiento del bosón de Higgs, que ha necesitado de la colaboración de miles de científicos de todo el mundo, así como la mayor y más sofisticada máquina jámas construida por el ser humano (el LHC). La necesidad de entender los fenómenos de la naturaleza es imparable, así como la creación de nu…
Effects of Polyacrylic Acid Pre-Treatment on Bonded-Dentine Interfaces Created with a Modern Bioactive Resin-Modified Glass Ionomer Cement and Subjec…
2018
Objectives: Resin-modified glass ionomer cements (RMGIC) are considered excellent restorative materials with unique therapeutic and anti-cariogenic activity. However, concerns exist regarding the use of polyacrylic acid as a dentine conditioner as it may influence the bonding performance of RMGIC. The aim of this study was to evaluate the effect of different protocols for cycling mechanical stress on the bond durability and interfacial ultramorphology of a modern RMGIC applied to dentine pre-treated with/without polyacrylic acid conditioner (PAA). Methods: The RMGIC was applied onto human dentine specimens prepared with silicon-carbide (SiC) abrasive paper with or without the use of a PAA c…
Pro-Degradant Activity of Naturally Occurring Compounds on Polyethylene in Accelerate Weathering Conditions
2019
In this work, naturally occurring compounds, such as Vitamin E (VE) and Ferulic Acid (FA), at high concentrations, have been considered as pro-degradant agents for Low Density Polyethylene (PE). However, all obtained results using the naturally occurring molecules as pro-oxidant agents for PE have been compared with the results achieved using a classical pro-oxidant agent, such as calcium stearate (Ca stearate) and with neat PE. The preliminary characterization, through rheological, mechanical and thermal analysis, of the PE-based systems highlights that the used naturally occurring molecules are able to exert a slight plasticizing action on PE and subsequently the PE rigidity and crystalli…
Sobre Catherine Andrews, De Cádiz a Querétaro. Historiografía y bibliografía del constitucionalismo mexicano
2019
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Les sacrifices du corps: configuration, formes et évolution de(s) mémoire(s) de Blas de Lezo en Espagne. XVIIIe-XIXe siècles
2020
Resumen Desde las aportaciones metodológicas y teóricas de los memory studies, este artículo analiza la configuración de la memoria de Blas de Lezo desde sus inicios hasta finales del siglo XIX. A partir del estudio de biografías, compendios históricos y artículos periodísticos principalmente, tratan de delimitarse los factores que confluyen en su construcción, la versatilidad de su funcionalidad política y las constantes modificaciones producidas en sus usos públicos. La revalorización de la figura de Lezo es interpretada como símbolo del imperio y la nación española, esencia de la españolidad –unida a la exaltación de los fueros y la especificidad vasca– y ejemplo de sacrificio para una m…
Halogen Bonds in 2,5-Dihalopyridine-Copper(I) Halide Coordination Polymers
2019
Two series of 2,5-dihalopyridine-Cu(I)A (A = I, Br) complexes based on 2-X-5-iodopyridine and 2-X-5-bromopyridine (X = F, Cl, Br and I) are characterized by using single-crystal X-ray diffraction analysis to examine the nature of C2&minus
Rendimiento académico, condición física y hábitos de actividad física: una aproximación a través de mapas auto-organizados
2016
La relación entre la actividad física, la condición física y el rendimiento académico en adolescentes se ha estudiado ampliamente; sin embargo, la controversia en relación con este tema persiste. Los métodos utilizados hasta ahora para analizar la relación entre estas variables se han llevado a cabo análisis lineales tradicional mayormente según la literatura disponible. El objetivo de este estudio fue realizar un análisis visual de esta relación con mapas auto-organizados y supervisar la evolución de los estudiantes durante los 4 años de la escuela secundaria. Cuatrocientos cuarenta y cuatro estudiantes participaron en el estudio. Se midió la actividad física y la condición física de los p…
Predicting the 2000‐m Rowing Ergometer Performance from Anthropometric, Maximal Oxygen Uptake and 60‐s Mean Power Variables in National Level Young R…
2020
Abstract Many studies reported various relationships between 2000-m rowing performance and anthropometric as well as metabolic variables, however, little is known about 60-s mean power in elite youth athletes. The aim of this study was to develop different regression models to predict 2000-m rowing indoor performance time (t2000) using anthropometric variables, maximal oxygen uptake (VO2max) and mean power established during a 60-s all-out test (W60) in national elite youth rowers. Fifteen youth male Italian rowers (age: 15.7 ± 2.0 years; body height: 176.0 ± 8.0 cm; body mass: 71.2 ± 10.0 kg) performed an incremental maximal test, a 60-s all-out test and a 2000-m race simulation using a Co…
Influence of a Thiolate Chemical Layer on GaAs (100) Biofunctionalization: An Original Approach Coupling Atomic Force Microscopy and Mass Spectrometr…
2013
International audience; Widely used in microelectronics and optoelectronics; Gallium Arsenide (GaAs) is a III-V crystal with several interesting properties for microsystem and biosensor applications. Among these; its piezoelectric properties and the ability to directly biofunctionalize the bare surface, offer an opportunity to combine a highly sensitive transducer with a specific bio-interface; which are the two essential parts of a biosensor. To optimize the biorecognition part; it is necessary to control protein coverage and the binding affinity of the protein layer on the GaAs surface. In this paper; we investigate the potential of a specific chemical interface composed of thiolate molec…
Self-esteem and intentions mediate perceived fitness with physical activity in Finnish adolescents with long-term illness or disabilities
2014
Background: The International Classification of Functioning, Disability and Health (ICF) is recognised as the common language in disability research. However, personal factors in the ICF are not explicitly coded because of cultural differences that influence physical activity (PA) participation. The ICF suggests using fitness as a personal factor, as well as other psychological assets. Intentions may serve as such psychological assets and studies on the antecedents to intentions which prompts PA behaviours is lacking in adolescent long term illness or disability (LTID) populations. Objective: The purpose of this study was to report how ICF personal factors can influence participation in PA.…