Search results for "FAST"
showing 10 items of 821 documents
Negative and positive Kerr nonlinearity of air calibrated with transient molecular alignment
2009
Talk given by O. Faucher; International audience; Nonlinear electronic Kerr index of the major air constituents has been measured up to high order terms using transient molecular alignment as a reference. Sign reversal associated to negative nonlinearity is observed above a pulse intensity of 26 TW/cm^.2
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…
An attempt to seize the political occasion : a study dealing with time in the Northern Ireland Women's Coalition
2006
Ultrafast Interface Charge Separation in Carbon Nanodot-Nanotube Hybrids
2021
Carbon dots are an emerging family of zero-dimensional nanocarbons behaving as tunable light harvesters and photoactivated charge donors. Coupling them to carbon nanotubes, which are well-known electron acceptors with excellent charge transport capabilities, is very promising for several applications. Here, we first devised a route to achieve the stable electrostatic binding of carbon dots to multi- or single-walled carbon nanotubes, as confirmed by several experimental observations. The photoluminescence of carbon dots is strongly quenched when they contact either semiconductive or conductive nanotubes, indicating a strong electronic coupling to both. Theoretical simulations predict a favo…
Strongly Coupled Coherent Phonons in Single-Layer MoS 2
2019
We present a transient absorption setup combining broadband detection over the visible-UV range with high temporal resolution ($\sim$20fs) which is ideally suited to trigger and detect vibrational coherences in different classes of materials. We generate and detect coherent phonons (CPs) in single layer (1L) MoS$_2$, as a representative semiconducting 1L-transition metal dichalcogenide (TMD), where the confined dynamical interaction between excitons and phonons is unexplored. The coherent oscillatory motion of the out-of-plane $A'_{1}$ phonons, triggered by the ultrashort laser pulses, dynamically modulates the excitonic resonances on a timescale of few tens fs. We observe an enhancement by…
KOSMOS 2017 Peru Side Experiment: nutrients, phytoplankton abundances, enzyme rates, photophysiology
2022
This data was collected during an short-term incubation experiment in March 2017 that investigated the response of a surface plankton community to upwelling. This experiment was carried in the framework of the SFB754-funded KOSMOS mesocosm study that took place in La Punta, Callao, Peru between February-April 2017. A total of six different treatments were used to disentangle chemical and biological characteristics of deep water that influence surface plankton blooms: 2 different deep water sources with different nutrient concentrations; 3 treatments to distinguish the effects of inorganic nutrients, organic nutrients and deep water microbial populations. Measured variables include inorganic…
Religijna motywacja postu
2016
The research of the religious motivation of fast in the light of the theory and practice, within the framework of three great monotheistic religions, came to the following conclusions: fasting, as a religiously motivated act, expresses its deep conviction about depending on the man and his fate from God; may be motivated by the need to show contrition before God for the committed sins; expresses hu mility in the face of the threatening danger; as a way of preparation, purifiation before major holidays; as one of the elements in commemoration of important events; as the source of peace and balance in the individual and social life; is a tool to help tame the passions; prepares for a new phas…
De joven a mujer: persistencia de prácticas culturales en los procesos de definición de la identidad y de la pertenencia en las jóvenes de origen ext…
2016
La experiencia de la migración altera la linealidad de las relaciones intergeneracionales, tanto en el plano de los valores morales, como en aquello cultural, al ser un evento/experiencia de completo cambio de la realidad familiar (Scabini & Rossi, 2008) e del ambiente de vida (Yeoh, 2000). Las características y los tiempos de transformación dependen sobre todo, del tipo de relación entre la familia inmigrada y la sociedad que la acoge, del espacio social accesible para los inmigrados de segunda generación y del tiempo empleado por la estructura familiar en la reelaboración de los valores tradicionales de pertenencia. La relación entre las generaciones que se define, por muchos padres extra…
LyghtCycler Septifast in early diagnosis of sepsis: our experience.
2009
Detecting clusters in spatially correlated waveforms
2017
Seismic networks often record signals characterized by similar shapes that provide important information according to their geographic positions. We propose an approach to identify homogeneous clusters of seismic waves, combining analysis of waveforms with metadata and spectrogram information. In waveforms clustering, cross-correlation measures between signals may presents some limitations, so we refer to more recent contributes relating data-depth based clustering analysis. The mechanism for alignment is also an important topic of the analysis: warping (or aligning) procedures identify nuisance effects in phase variation, that, if ignored, may result in a possible loss of information and t…