Search results for "Estructura"
showing 10 items of 368 documents
Dificultades para Codificar, Relacionar y Categorizar Problemas Verbales Algebraicos: dos estudios con estudiantes de secundaria y profesores en form…
2014
En resolución de problemas verbales por transferencia, la activación de problemas ya conocidos que sirvan de guía, depende de las analogías percibidas entre éstos y el problema a resolver. Se desarrollan dos estudios relacionados para analizar en qué características se basan los estudiantes para codificar problemas y detectar sus analogías, en tareas de categorización (sorting). Se utilizaron técnicas cuantitativas y cualitativas combinadas. Primero se analizó cómo los estudiantes de secundaria son influidos por diferentes variables características de problemas de ciencias. Una gran proporción de sujetos no fue capaz de percibir las analogías y diferencias adecuadas entre problemas. El segu…
Identification of determinants for rescheduling travel mode choice and transportation policies to reduce car use in urban areas
2018
[EN] This paper presents a qualitative analysis about the determinants related to rescheduling travel mode decisions during the activity scheduling process. Notably, we were interested to study changes between intention and behavior. Data used came from an in-depth Computer Assisted Telephone Interview (CATI) follow up survey to habitual drivers carried out during the implementation of a panel survey. An interpretative qualitative method based on Analytic Induction was used to cope with the complex nature of rescheduling decisions and the characteristics of the data. The Theory of Planned Behavior has been used to gain a better understanding of the reasons associated with rescheduling trave…
Role of extension and compression in the evolution of the eastem margin of Iberia: the ESCI- València Trough seismic profile
1994
Carlos.Santisteban@uv.es The ESCI-València Trough deep seismic reflection profile crosses the eastern margin of Iberia and can be divided into three regions according to crustal structure. From NW to SE they are: a) the Ebro Basin, whit a 33 km thick continental crust wich remained almost undeformed during the Cenozoic and is very reflective in its lower part; b) the Continental Margin, made up of the Catalan-Valencian Domain and the Balearic Promontory with a thin (12 to 30 km thick) continental crust wich was deformed during the Cenozoic, extensional structures predominating the first domain and contractional structures in the second; and c) the Algerian Basin, with a 9 km thick oceanic c…
Ultrathin Films of 2D Hofmann-Type Coordination Polymers: Influence of Pillaring Linkers on Structural Flexibility and Vertical Charge Transport
2019
Searching for novel materials and controlling their nanostructuration into electronic devices is a challenging task ahead of chemists and chemical engineers. Even more so when this new application requires an exquisite control over the morphology, crystallinity, roughness and orientation of the films produced. In this context, it is of critical importance to analyze the influence of the chemical composition of perspective materials on their properties at the nanoscale. We report the fabrication of ultrathin films (thickness < 30 nm) of a family of FeII Hofmann-like coordination polymers by using an optimized liquid phase epitaxy (LPE) set-up. The series [Fe(L)2{Pt(CN)4}] (L = pyridine, pyri…
Efectos de las tareas de elaboración de resúmenes en el control de la comprensión de textos científicos en estudiantes universitarios con niveles de …
2012
Two studies were conducted to improve Spanish university student's comprehension monitoring of macro-ideas when reading expository Science texts in English (L2). The first one evaluated the effects of using summarization tasks on comprehension monitoring compared to other reading-for-understanding tasks. A significant improvement of comprehension monitoring was obtained from the summarization tasks. Results in study 1 suggested study 2 aimed at instructing students on summarizing texts in L2. The instructional work had a single significant contribution to students’ comprehension monitoring on the macro-structural level. English proficiency also explained a significant proportion of the vari…
Carbon Nano-onions: Potassium Intercalation and Reductive Covalent Functionalization
2021
Herein we report the synthesis of covalently functionalized carbon nano-onions (CNOs) via a reductive approach using unprecedented alkali-metal CNO intercalation compounds. For the first time, an in situ Raman study of the controlled intercalation process with potassium has been carried out revealing a Fano resonance in highly doped CNOs. The intercalation was further confirmed by electron energy loss spectroscopy and X-ray diffraction. Moreover, the experimental results have been rationalized with DFT calculations. Covalently functionalized CNO derivatives were synthesized by using phenyl iodide and n-hexyl iodide as electrophiles in model nucleophilic substitution reactions. The functiona…
Especificaciones alternativas de la estructura temporal de volatilidades
2005
En este trabajo se describe y analiza la estructura temporal de volatilidades instantáneas de los tipos de interés forward correspondientes al mercado español durante el periodo 1999-2002. Este estudio se realiza en el contexto del Modelo de Mercado LIBOR proponiéndose, además, una nueva fórmula para describir la volatilidad instantánea de los tipos de interés forward con parámetros fácilmente interpretables. Junto a este modelo se calibran otros dos alternativos propuestos en la literatura que son utilizados como benchmark para contrastar su validez. Esta contrastación se lleva a cabo a partir de datos del mercado de caps proporcionando resultados satisfactorios para el modelo aquí present…
La toma inteligente de decisiones en los procesos de planificación de destinos turísticos de litoral: el plan de infraestructuras turísticas de canar…
2017
El Plan de Infraestructuras Turísticas de Canarias [PITCAN2017-2013] es un encargo de la Dirección General de Infraestructuras Turísticas de la Consejería de Turismo, Cultura y Deportes del Gobierno de Canarias a un grupo de investigadores de la Cátedra de Turismo CajaCanarias‐Ashotel‐Universidad de La Laguna y del grupo de investigación de la ULL ReinvenTUR: renovación e innovación turística, a través de la Fundación General de la Universidad de La Laguna. El objetivo del plan es enumerar y priorizar las infraestructuras turísticas públicas a implementar en el período 2017-2023. Para el desarrollo de este objetivo se ha aplicado un proceso metodológico basado en la participación de agentes…
Elucidating the aryl hydrocarbon receptor antagonism from a chemical-structural perspective.
2020
The aryl hydrocarbon receptor (AhR) plays an important role in several biological processes such as reproduction, immunity and homoeostasis. However, little is known on the chemical-structural and physicochemical features that influence the activity of AhR antagonistic modulators. In the present report, in vitro AhR antagonistic activity evaluations, based on a chemical-activated luciferase gene expression (AhR-CALUX) bioassay, and an extensive literature review were performed with the aim of constructing a structurally diverse database of contaminants and potentially toxic chemicals. Subsequently, QSAR models based on Linear Discriminant Analysis and Logistic Regression, as well as two tox…
Edificios de viajeros del Trenet 1920. De Francisco Mora a Calatrava
2003
La actual infraestructura del ferrocarril de vía estrecha en la provincia de Valencia es el resultado de una emblemática red de comunicaciones de casi 120 años de antigüedad. Red que se ha proyectado, construido, modificado, derribado o conservado durante un largo periodo cronológico, donde las tendencias y necesidades de un determinado momento histórico marcan las diferentes tipologías de los edificios de viajeros. El objetivo principal de este artículo es presentar los proyectos arquitectónicos de los edificios de viajeros desde 1920 hasta la actualidad; desde Francisco Mora con la ruptura del modelo clasicista y funcional de los primeros tiempos del ferrocarril hasta las estaciones tecno…