Search results for "conduct"
showing 10 items of 4412 documents
Unravelling the Intertwined Atomic and Bulk Nature of Localised Excitons by Attosecond Spectroscopy
2021
The electro-optical properties of most semiconductors and insulators of technological interest are dominated by the presence of electron-hole quasi-particles, called excitons. The manipulation of excitons in dielectrics has recently received great attention, with possible applications in different fields including optoelectronics and photonics. Here, we apply attosecond transient reflection spectroscopy in a sequential two-foci geometry and observe sub-femtosecond dynamics of a core-level exciton in bulk MgF2 single crystals. Furthermore, we access absolute phase delays, which allow for an unambiguous comparison with theoretical calculations. Our results show that excitons surprisingly exhi…
New charge transfer salts of two organic π-donors of the tetrathiafulvalene type with the paramagnetic [Cr(NCS)6]3- anion
2003
cited By 9; International audience; The electrochemical combination of the paramagnetic anion [Cr(NCS)6]3- with the organic π-donors bis(ethylenedithio)tetrathiafulvalene (ET) and 4,5-bis(2-hydroxyethylthio) -4′,5′-ethylenedithiotetrathiafulvalene (DHET-EDTTTF) leads to two new radical cation salts, namely (ET)4 [Cr(NCS 6]·PhCN 1 and (DHET-EDTTTF)2 (NEt4)[Cr(NCS)6] 2. Both have been characterized by X-ray crystallography, magnetic and resistivity measurements. The structure of 1 consists of alternating inorganic layers generated by the anions and organic layers in which the PhCN molecules are inserted; the organic sub-lattice is built up from four different ET units, three of them with a ch…
Blue Emitting Organic Light Emitting Diodes
2019
Organic light emitting diodes (OLEDs) [1] can be fabricated on a range of materials such as glass, silicon or flexible plastic substrates. This can be exploited for the realization of integrated OLED-based fluorescence chemical sensors [2] and microfluidic systems [3] for application in areas such as biotechnology, life sciences, pharmaceuticals, public health and defense. These devices hold promises to be cost effective, ultra-compact (including the possibility to be fabricated into large bidimensional arrays), and capable to handle smaller sample volumes in order to achieve high throughput. Blue light is advantageous because it is strongly absorbed by most sensing molecules attached to bi…
The Relation between Photoconductivity Threshold and Open-Circuit Voltage in Organic Solar Cells
2022
Financial support provided by Scientific Research Project for Students and Young Researchers No. SJZ/2020/08 implemented at the Institute of Solid State Physics, University of Latvia is greatly acknowledged. Institute of Solid State Physics, University of Latvia as the Centre of Excellence has received funding from the European Union’s Horizon 2020 Framework Programme H2020-WIDESPREAD-01-2016-2017-TeamingPhase2 under grant agreement No. 739508, project CAMART².
Proton Exchange Membrane Fuel Cells (PEMFCs): Advances and Challenges
2021
The study of the electrochemical catalyst conversion of renewable electricity and carbon oxides into chemical fuels attracts a great deal of attention by different researchers. The main role of this process is in mitigating the worldwide energy crisis through a closed technological carbon cycle, where chemical fuels, such as hydrogen, are stored and reconverted to electricity via electrochemical reaction processes in fuel cells. The scientific community focuses its efforts on the development of high-performance polymeric membranes together with nanomaterials with high catalytic activity and stability in order to reduce the platinum group metal applied as a cathode to build stacks of proton …
Orientación temporal y actitudes hacia las conductas económicas de ahorro y endeudamiento
2016
El comportamiento económico está estrechamente relacionado con aspectos psicológicos individuales y psicosociales. Actualmente, las propuestas para explicar la conducta económica tienen muy presente la importancia de los aspectos psicológicos, lo que justifica el abordaje de su estudio desde un enfoque económico y psicológico. Una decisión económica suele implicar la resolución de un conflicto fundamental: ahorrar o gastar. El gasto, cuando es inasumible, puede renunciarse a él, ahorrar para acumular el capital necesario o bien pedir prestada la cantidad necesaria, es decir, endeudarse. Por ello, partiendo de la consideración de que el ahorro y el endeudamiento son dos de las conductas más …
Time-dependent Landauer—Büttiker formalism for superconducting junctions at arbitrary temperatures
2016
We discuss an extension of our earlier work on the time-dependent Landauer– Büttiker formalism for noninteracting electronic transport. The formalism can without complication be extended to superconducting central regions since the Green’s functions in the Nambu representation satisfy the same equations of motion which, in turn, leads to the same closed expression for the equal-time lesser Green’s function, i.e., for the time-dependent reduced one-particle density matrix. We further write the finite-temperature frequency integrals in terms of known special functions thereby considerably speeding up the computation. Simulations in simple normal metal – superconductor – normal metal junctions…
Electrodermal activity in couple therapy for intimate partner violence
2018
The aim of this study was to examine the extent to which intimate partner violence (IPV) is discussed in couple therapy, what the participants say about it and how, and how the participants’ electrodermal activity (EDA) is activated during these discussions. We studied four couples for whom IPV was an issue in dialog with their therapists. We used thematic analysis and examined the differences in EDA (measured as skin conductance responses, SCRs) between the participants. We found that although IPV was discussed relatively little in therapy, when the topic arose the victims took an active part in the discussion. We also found that the main themes were descriptions of IPV, explanations for I…
Discapacitat intel·lectual i fenotip conductual: perfil psicopatològic i trastorns de conducta
2012
Es descriu el fenotip conductual (perfil psicopatològic i trastorns del comportament) en la discapacitat intel·lectual.
Los infractores reincidentes en el tráfico: análisis de variables sociodemográficas, personalidad y consumo de alcohol de los asistentes a los cursos…
2015
INTRODUCCIÓN Las intervenciones que se pueden realizar ante el problema de la seguridad vial son muy diversas. Pero entre todas las medidas adoptadas en los últimos años, concretamente a raíz de la puesta en marcha del Plan Estratégico de Seguridad Vial 2005-2008 de la Dirección General de Tráfico, destaca, por su repercusión social y legislativa, la puesta en marcha del Sistema de Permiso por Puntos (SPP). El objetivo principal del SPP es mejorar la seguridad vial a través de la reducción de la reincidencia en la comisión de infracciones, promoviendo un cambio de actitudes y comportamientos en las vías públicas. No obstante, aunque el efecto principal del SPP es disuadir a los conductores …