Search results for "LET"
showing 10 items of 23489 documents
Effect of the Si doping on the properties of AZO/SiC/Si heterojunctions grown by low temperature pulsed laser deposition
2020
Abstract The structural and photoelectrical properties of Al-doped ZnO (AZO)/SiC/p-Si and AZO/SiC/n-Si heterojunctions, fabricated at low temperature by pulsed laser deposition, were investigated by means of a number of techniques. Raman analysis indicates that SiC layers have the cubic 3C-SiC phase, whilst X-ray diffraction measurements show that AZO films exhibit a hexagonal wurtzite structure, highly textured along the c-axis, with average crystallites size of 35.1 nm and lattice parameter c of 0.518 nm. The homogeneous and dense surface morphology observed by scanning electron microscopy was confirmed by atomic force microscopy images. Moreover, UV–Vis-NIR spectra indicated a high trans…
Physiological parameters measurements in a cardiac cycle via a combo PPG-ECG system
2015
In this paper, we present an innovative way to measure some physiological parameters (such as the pre-ejection period, the pulse transit time, the blood pressure) in a cardiac cycle. A combo PPG-ECG system has been developed and employed to extract both the ECG signal from standard limb leads and simultaneously the photoplethysmography signal from the wrist and the forearm, to calculate the pre-ejection period. This system represents an easy and non-invasive technique to determine these biomedical parameters without using expensive impedance cardiography equipment.
Pulicaria glutinosa Extract: A Toolbox to Synthesize Highly Reduced Graphene Oxide-Silver Nanocomposites
2015
A green, one-step approach for the preparation of graphene/Ag nanocomposites (PE-HRG-Ag) via simultaneous reduction of both graphene oxide (GRO) and silver ions using Pulicaria glutinosa plant extract (PE) as reducing agent is reported. The plant extract functionalizes the surfaces of highly reduced graphene oxide (HRG) which helps in conjugating the Ag NPs to HRG. Increasing amounts of Ag precursor enhanced the density of Ag nanoparticles (NPs) on HRG. The preparation of PE-HRG-Ag nanocomposite is monitored by using ultraviolet-visible (UV-Vis) spectroscopy, powder X-ray diffraction (XRD), and energy dispersive X-ray (EDX). The as-prepared PE-HRG-Ag nanocomposities display excellent surfac…
Anastasija Verbickaja, o il decadentismo per le masse
2012
1910 is remembered in Russian culture as the year when symbolism declares its crisis, when the post-symbolist movements move their first steps. But a look at the publishing figures is enough to understand that this process passed unnoticed by the majority of the reading public. In early XX-th century, popular literature was already an important and complex phenomenon. The readers of dime novels had no notion of the highbrow movements; the “people's intelligentsia”, on the other hand, opposed them as enemies to their values of social commitment. Anastasia Verbickaia, one of the leaders of the market in the first two decades of the century, although her career had started in the same field, i…
Mythologie in musicis: Simbología e iconología en la música de Karlheinz Stockhausen. El ciclo Licht (1977-2003)
2011
A través de la revisión del contenido y la estructura de cada una de las siete óperas queintegran el ciclo Licht de Karlheinz Stockhausen, presentamos en este artículo un estudio de lasimbología y la iconología musical que de ellas se desprende. La compleja relación de símbolose iconos de todo tipo que encontramos a lo largo de cada una de las jornadas de Licht nos permite abordar su problemática mediante un análisis cuyo objetivo primordial es poner demanifiesto la riqueza de las conexiones que se establecen entre los diversos elementos musicales, teatrales, visuales y culturales, así como delimitar los diversos significados implícitos y las funciones que éstos desempeñan en un ciclo operí…
Cinco cabezas, de José Hierro: imagen, palabra y cuerpo fuera del tiempo
2009
“Cinco cabezas”, la parte central de Agenda (1991), de José Hierro, es un conjunto de cinco poemas y dibujos, agrupados en parejas que se explican de manera recíproca. Los textos, escritos en una rítmica prosa poética, reflejan a través de concatenaciones de metáforas la diversidad de experiencias del sujeto, expresadas a través de cada uno de los cinco sentidos. La experiencia común —que tanto en la parte textual como en la pictórica funciona en un complejo entramado simbólico— es el sufrimiento, que se pretende superar mediante la supresión del tiempo. La solución negativa es la muerte; la más positiva es la evasión, bien sea mediante la inserción en un tiempo circular, mítico, bien media…
'Circolarità virtuosa' e 'virtù crudele': per una pragmatica relazionale nel De beneficiis di Seneca.
2012
Le testimonianze letterarie del passato consegnano alla società di oggi categorie socio-antropologiche e dinamiche relazionali nelle quali è possibile individuare quella che Assmann chiama “struttura connettiva” tra antichità e modernità. Un esempio paradigmatico è costituito dalla prassi dello scambio dei benefici nel de beneficiis di Seneca.
Nouvelles technologies et aide à la compréhension de documents techniques : Construction et expérimentation d'un simulateur de fonctionnement de grue…
2001
Reading skills are more and more required to succeed professional examination. French crane drivers are concerned with this problem. In order to help them, we have conducted a study with three main steps. First, we carried out a cognitive work analysis. Second, we test several analogical modalities of written presentations focusing on the construction of a specific simulator. Finally, two experiments are presented showing a significative effect of this simulator on the comprehension of cranes technical documentation.
Computationally Efficient Innovative Techniques for the Design-Oriented Simulation of Free-Running and Driven Microwave Oscillators
2014
Analysis techniques for injection-locked oscillators/amplifiers (ILO) can be broadly divided into two classes. To the first class belong methods with a strong and rigorous theoretical basis, that can be applied to rather general circuits/systems but which are very cumbersome and/or time-consuming to apply. To the second class belong methods which are very simple and fast to apply, but either lack of validity/accuracy or are applicable only to very simple or particular cases. In this thesis, a novel method is proposed which aims at combining the rigorousness and broad applicability characterizing the first class of analysis techniques above cited with the simplicity and computational efficie…
El gest i la dixi d'espai en textos instructius
2009
La dixi és normalment concebuda, des del punt de vista lingüístic, com un fenomen que mostra la relació entre els trets estructurals del llenguatge i el context específic de comunicació. Hi ha mecanismes no verbals que també actuen com a recursos díctics en moltes situacions de la llengua oral. És per aquesta raó que calen estudis que analitzin diferents aspectes de la combinació d’aquests diferents mecanismes. L’objectiu d’aquesta proposta és analitzar la relació entre la verbalització dels díctics d’espai trobats en els textos instructius del projecte PRAGMAESTIL i els elements no verbals que els acompanyen. Concretament, s’observarà en primer lloc si els díctics van acompanyats de gestos…