Search results for "Spect"
showing 10 items of 28650 documents
Formation, Structural Characterization, and Calculated NMR Chemical Shifts of Selenium-Nitrogen Compounds from SeCl4 and ArNHLi (Ar = supermesityl, m…
2004
Supermesityl selenium diimide [Se{N(C6H2tBu3-2, 4, 6)}2; Se{N(mes*)}2] can be prepared in a good yield from the reaction of SeCl4 and (mes*)NHLi. The molecule adopts an unprecedented anti, anti-conformation, as deduced by DFT calculations at PBE0/TZVP level of theory and supported by 77Se NMR spectroscopy and a crystal structure determination. An analogous reaction involving (C6H2Me3-2, 4, 6)NHLi [(mes)NHLi] unexpectedly lead to the reduction of selenium and afforded the selenium diamide Se{NH(mes)}2 that was characterized by X-ray crystallography and 77Se NMR spectroscopy. The Se-N bonds of 1.847(3) and 1.852(3) A show normal single bond lengths. The <NSeN bond angle of 109.9(1)° also indi…
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…
Why are dreams interesting for philosophers? The example of minimal phenomenal selfhood, plus an agenda for future research1
2013
This metatheoretical paper develops a list of new research targets by exploring particularly promising interdisciplinary contact points between empirical dream research and philosophy of mind. The central example is the MPS-problem. It is constituted by the epistemic goal of conceptually isolating and empirically grounding the phenomenal property of “minimal phenomenal selfhood,” which refers to the simplest form of self-consciousness. In order to precisely describe MPS, one must focus on those conditions that are not only causally enabling, but strictly necessary to bring it into existence. This contribution argues that research on bodiless dreams, asomatic out-of-body experiences, and ful…
Why are dreams interesting for philosophers? The example of minimal phenomenal selfhood, plus an agenda for future research.
2013
This metatheoretical paper develops a list of new research targets by exploring particularly promising interdisciplinary contact points between empirical dream research and philosophy of mind. The central example is the MPS-problem. It is constituted by the epistemic goal of conceptually isolating and empirically grounding the phenomenal property of “minimal phenomenal selfhood,” which refers to the simplest form of self-consciousness. In order to precisely describe MPS, one must focus on those conditions that are not only causally enabling, but strictly necessary to bring it into existence. This contribution argues that research on bodiless dreams, asomatic out-of-body experiences, and ful…
Funcionamiento familiar, autoestima y consumo de sustancias en adolescentes: un modelo de mediación Family functioning, self-esteem and substance use…
2007
OBJETIVO: Analizar las relaciones directas e indirectas entre el funcionamiento familiar, la autoestima considerada desde una perspectiva multidimensional (autoestima familiar, escolar, social y física) y el consumo de sustancias. MATERIAL Y MÉTODOS: Los datos se recogieron durante el año escolar 2003-2004 y corresponden a dos muestras independientes de adolescentes españoles (n1= 414, Castilla y León; n2= 625, Comunidad Valenciana). Para el análisis de datos se utilizó la técnica estadística de ecuaciones estructurales y se siguió el procedimiento de análisis de efectos mediadores de Holmbeck (1997). RESULTADOS: La autoestima media significativamente la influencia del funcionamiento famili…
Trait Self-Control, Social Cognition Constructs, and Intentions: Correlational Evidence for Mediation and Moderation Effects in Diverse Health Behavi…
2019
Background: We examined effects of trait self‐control, constructs from social cognition theories, and intentions on health behaviours. Trait self‐control was expected to predict health behaviour indirectly through theory constructs and intentions. Trait self‐control was also predicted to moderate the intention–behaviour relationship. Methods: Proposed effects were tested in six datasets for ten health‐related behaviours from studies adopting prospective designs. Participants (N = 3,249) completed measures of constructs from social cognition theories and self‐control at an initial time point and self‐reported their behaviour at follow‐up. Results: Results revealed indirect effects of self‐co…
Diseño de un sistema de apoyo a la regulación social del aprendizaje en los xMOOC
2019
Esta investigación tiene como objetivo estudiar los procesos de regulación del aprendizaje, atendiendo tanto a su dimensión individual como social, en entornos de xMOOC. En concreto, se propone analizar cómo los procesos de autorregulación, corregulación y regulación social compartida pueden apoyarse y promoverse en este tipo de contextos abiertos y masivos para conseguir un aprendizaje más profundo. Para ello, se aplica un modelo de investigación basada en el diseño que permite intervenir directamente en la práctica pedagógica, a través de un proceso cíclico de cuatro etapas: diseño, intervención, evaluación y reflexión y rediseño de un sistema de apoyo a la regulación del aprendizaje en u…
High precision numerical approach for Davey–Stewartson II type equations for Schwartz class initial data
2020
We present an efficient high-precision numerical approach for Davey–Stewartson (DS) II type equa- tions, treating initial data from the Schwartz class of smooth, rapidly decreasing functions. As with previous approaches, the presented code uses discrete Fourier transforms for the spatial dependence and Driscoll’s composite Runge–Kutta method for the time dependence. Since DS equations are non-local, nonlinear Schrödinger equations with a singular symbol for the non-locality, standard Fourier methods in practice only reach accuracy of the order of 10−6or less for typical examples. This was previously demonstrated for the defocusing integrable case by comparison with a numerical approach for …
Wpływ rozkładu widma promieniowania słonecznego na parametry multikrystalicznego ogniwa krzemowego
2014
W artykule opisano wyniki uzyskane z opracowanej aplikacji integrującej model rozkładu widma promieniowania słonecznego oraz model krzemowego monokrystalicznego ogniwa fotowoltaicznego. W ramach badań opracowano program - symulator widma promieniowania słonecznego wykorzystujący algorytmy i procedury numeryczne oparte na modelu SMARTS2. Ponadto, przygotowano aplikację pozwalającą na przeprowadzenie modelowania komputerowego zachowania się ogniw i analizę zmienności ich parametrów przy zastosowaniu różnych rozkładów spektralnych oświetlenia oraz różnych parametrów materiałowo-konstrukcyjnych ogniw PV. Z wykorzystaniem niniejszej aplikacji przeprowadzono szereg symulacji. Dokonano analizy zal…
Análisis de los antecedentes histórico-filosóficos de la "paradoja cognitiva de Duval"
2015
In a famous article published in 1993, Raymond Duval highlighted a simple fact: the student may confuse the mathematical object O he is trying to build cognitively with one of its semiotic representations R(O). Duval explained that this confusion was due to a sort of inevitable paradox: only someone who has already built O, can recognize R(O) as a representation of O and not as an object in itself. Thereafter, this thought has been extremely influential for researchers. However, even if in different terms, many scholars of semiotics have emphasized the same phenomenon. In this paper we propose to remind some of them. En un famoso artículo publicado en 1993, Raymond Duval evidenciaba el sigu…