Search results for " key"
showing 10 items of 409 documents
Biogeochemical Cycle of Silica in an Apolyhaline Interdunal Holocene Lake (Chad, N'Guigmi Region, Niger)
1999
During the Holocene, the apolyhaline conditions in interdunal ephemeral lakes in the Lake Chad region led to various diagenetic processes, which resulted in: (a) clay authigenesis, (b) organic matter lithification (plants and cyanobacterial mats), (c) precipitation of sodium silicate (magadiite, kenyaite, zeolite), and (d) chert neoformation. Each step in this diagenetic process involves silica, which can be highly mobile under such conditions. Therefore, the paleoenvironmental variations can be investigated using the Si cycle.http://link.springer. de/link/service/journals/00114/bibs/9086010/90860475.htm</HEA
Siguiendo el ejemplo fenicio: colonización del Mediterráneo occidental por Spirobranchus cf. tetraceros (Annelida: Serpulidae)
2020
A newly established population of the fouling polychaete Spirobranchus cf. tetraceros is reported from the western Mediterranean (Valencia Port). Despite previous intensive surveys, this is the first record for the taxon in the Iberian Peninsula. Molecular analyses revealed that S. cf. tetraceros from Valencia are genetically identical to specimens from Heraklion, Crete, but different from those collected in the Red Sea and S. tetraceros sensu stricto from the type locality in Australia. Mediterranean and Red Sea S. cf. tetraceros form a well-supported monophyletic clade but are clearly distinct from New South Wales specimens of S. tetraceros. Our new molecular evidence supports the hypothe…
Measuring nuclear reaction cross sections to extract information on neutrinoless double beta decay
2017
Neutrinoless double beta decay (0v\b{eta}\b{eta}) is considered the best potential resource to access the absolute neutrino mass scale. Moreover, if observed, it will signal that neutrinos are their own anti-particles (Majorana particles). Presently, this physics case is one of the most important research "beyond Standard Model" and might guide the way towards a Grand Unified Theory of fundamental interactions. Since the 0v\b{eta}\b{eta} decay process involves nuclei, its analysis necessarily implies nuclear structure issues. In the NURE project, supported by a Starting Grant of the European Research Council (ERC), nuclear reactions of double charge-exchange (DCE) are used as a tool to extr…
Aproximación al higienismo en la arquitectura de Rafael Guastavino
2021
La obra de Rafael Guastavino Moreno (1842-1908) está vinculada habitualmente a la construcción con bóveda tabicada, un sistema constructivo tradicional originario del Levante peninsular que este arquitecto combinó con el mortero de cemento para erigir un gran número de edificios de muy diverso tipo tanto en Barcelona como posteriormente en Estados Unidos. Sin embargo, estos autores han defendido en otras ocasiones la versatilidad de Guastavino como arquitecto y hasta qué punto la bóveda tabicada no supuso en un principio el cuaderno de bitácora único ni principal para su trayectoria profesional. La bóveda tabicada representó una herramienta más en la panoplia de sus habilidades, entre las c…
FLUMO: FLexible Underwater MOdem
2019
The last years have seen a growing interest in underwater acoustic communications because of its applications in marine research, oceanography, marine commercial operations, the offshore oil industry and defense. High-speed communication in the underwater acoustic channel has been challenging because of limited bandwidth, extended multipath, refractive properties of the medium, severe fading, rapid time variation and large Doppler shifts. In this paper, we show an implementation of a flexible Software-Defined Acoustic (SDA) underwater modem, where modulation parameters are completely tunable to optimize performance. In particular, we develop the system architecture following two key ideas. …
Evaluación de la reacción de alumnos y docentes en un modelo mixto de aprendizaje para Educación Superior
2014
Si bien en la educación presencial uno de los factores clave del éxito es el desempeño del docente dentro del salón de clase, es evidente que dentro de la educación en línea el papel del docente será distinto a su papel tradicional. Por ello, deben revalorarse los factores que garantizarán la calidad en este nuevo tipo de oferta educativa. En este estudio se muestran los resultados obtenidos de un análisis de caso de educación mixta (blended learning) para educación superior, y se enlistan los factores de éxito resultantes, así como algunas barreras para la adecuada implantación.
A Synopsis of the Genus Stipa (Poaceae) in Middle Asia, Including a Key to Species Identification, an Annotated Checklist, and Phytogeographic Analys…
2020
The genus Stipa L. comprises over 150 species, all native to the Old World, where they grow in warm temperate regions throughout Europe, Asia, and North Africa. It is one of the largest genera in the family Poaceae in Middle Asia, where one of its diversity hotspots is located. However, identification of Middle Asian Stipa species is difficult because of the lack of new, comprehensive taxonomic studies including all of the species recorded in the region. We present a critical review of the Mid-Asian representatives of Stipa, together with an identification key and taxonomic listing. We relied on both published and unpublished information for the taxa involved, many of which are poorly known…
A Curvature Based Method for Blind Mesh Visual Quality Assessment Using a General Regression Neural Network
2016
International audience; No-reference quality assessment is a challenging issue due to the non-existence of any information related to the reference and the unknown distortion type. The main goal is to design a computational method to objectively predict the human perceived quality of a distorted mesh and deal with the practical situation when the reference is not available. In this work, we design a no reference method that relies on the general regression neural network (GRNN). Our network is trained using the mean curvature which is an important perceptual feature representing the visual aspect of a 3D mesh. Relatively to the human subjective scores, the trained network successfully asses…
Claves vertebradoras del modelo de justicia en el siglo XXI
2021
The 21st Century presents a dynamic, international, digital, changing, agile, and fast Society, that demands an adequated Justice System. The Incorporation due to Globalization of Keys such a Supranationality, Internationalization, Efficiency, Feminization, Technology, Algorithms and Artificial Intelligence, are involved in the changes of the new look of Justice.
Strategie innovative per la formazione dei futuri docenti
2017
La ricerca si propone di individuare un modello di acquisizione della competenza digitale e delle 4C (communication, collaboration, creativity and critical thinking) degli studenti del Corso di Laurea di Scienze della Formazione Primaria in vista di un reale sviluppo professionale. Si è ipotizzato che l’utilizzo del modello flipped classroom anche nella didattica universitaria possa rappresentare una valida proposta nella formazione dei futuri docenti di scuola primaria per la progressiva acquisizione delle 4C e che il progetto eTwinning nella formazione iniziale degli insegnanti possa fornire un valido supporto per promuovere tali competenze chiave. La valutazione e la scelta dei prodotti …