Search results for "Generation"
showing 10 items of 3050 documents
High-pressure phase ofLaPO4studied by x-ray diffraction and second harmonic generation
2016
The pressure-induced phase transition of monazite-type ${\mathrm{LaPO}}_{4}$ at $\ensuremath{\approx}26$ GPa is studied by single-crystal x-ray diffraction and second harmonic generation (SHG) up to 31 GPa. The structure of the postmonazite phase of ${\mathrm{LaPO}}_{4}$ has been obtained and it is shown that it corresponds to a post-barite-type structure with an acentric space group $P{2}_{1}{2}_{1}{2}_{1}$. A strong increase of the SHG signal at the transition confirms that the high-pressure polymorph is noncentrosymmetric. The phase transition involves a significant discontinuous decrease of the unit-cell volume by 6%, which is mainly due to a strong contraction of the $a$ lattice parame…
Dispersion Compensation in Holograms Reconstructed by Femtosecond Light Pulses
2014
This chapter describes how the spatiotemporal dispersion associated with the diffraction of broadband femtosecond light pulses through computer generated holograms (CGHs) can be compensated to a first order with a properly designed dispersion compensation module (DCM). The angular dispersion of the beam associated to CGHs leads to both spatial and temporal distortion of the pulse. Some experiments in one-shot second harmonic generation, wide-field two-photon microscopy, and parallel micromachining are shown to study the quality of the compensation performed with the DCM.
Investigation of AC Electrical Properties of MXene-PCL Nanocomposites for Application in Small and Medium Power Generation
2021
The paper examined Ti3C2Tx MXene (T—OH, Cl or F), which is prepared by etching a layered ternary carbide Ti3AlC2 (312 MAX-phase) precursor and deposited on a polycaprolactone (PCL) electrospun membrane (MXene-PCL nanocomposite). X-ray Diffraction analysis (XRD) and Scanning Electron Microscopy (SEM) indicates that the obtained material is pure Ti3C2 MXene. SEM of the PCL-MXene composite demonstrate random Ti3C2 distribution over the nanoporous membrane. Results of capacitance, inductance, and phase shift angle studies of the MXene-PCL nanocomposite are presented. It was found that the frequency dependence of the capacitance exhibited a clear sharp minima in the frequency range of 50 Hz to o…
Object tracking in medical imaging using a 2D active mesh system
2003
International audience; Abstract: This article proposes a technique for tracking moving organs in medical imaging. It can be split into two stages. We first initialize a 2D-triangular mesh on the first image of the sequence. We distinguish different objects of interest by grouping together the triangles that make them up. Afterwards, we deform this mesh on the successive images in order to track each identified object. The tracking stage uses optical flow by adding a node relaxation step to avoid mesh deteriorations. The mesh deformations analysis provides access to motion information along the sequence. This technique is applied to a cine-MRI sequences of the heart and allows the analysis …
Digital natives: Lucky or jellied?
2018
The technology now seems to have involved not only the world of adults, but also and especially that of children, becoming a form of communication and rapid interaction and widespread dissemination. Some parents start to worry about a possible technolog- ical dependency, given the hours spent by the youngest, called digital children, in front of computer, smartphones and tablets. A decade ago, the sociologist Mark Prensky spoke of digital natives, that is the first generation of children grew up with consoles, videogames and computers while today we are witnessing an evolution of this concept in the third generation of digital, appeared approximately with the arrival of iPad and tablet and …
Posługa Kościoła wobec młodzieży na przykładzie diecezji opolskiej
2019
Synod Biskupów dotyczący duszpasterstwa młodzieży, który odbył się w 2018 roku, zauważa, iż posługa pastoralna prowadzona wśród ludzi młodych powinna odbywać się przede wszystkim na poziomie parafii w ramach duszpasterstwa zwyczajnego. Jednak działalność zbawcza Kościoła wśród młodzieży wymaga także obecności elementów duszpasterstwa nadzwyczajnego, co ma dokonywać się poprzez odpowiednie przygotowanie samego duszpasterza i pomagających mu animatorów. Takie działanie może przyczynić się do efektywności prowadzonych działań pastoralnych. Niewątpliwie konieczne wydają się również: wizja, strategia prowadzenia duszpasterstwa na szczeblu diecezji, dekanatu i parafii, a także znajomość kondycji …
Les jeunes diplômés de bac+5 s'estiment-ils compétents pour occuper leurs emplois ?
2015
En ligne sur http://www.cereq.fr/content/download/15730/126062/file/netdoc142.pdf; National audience; Quelles sont les compétences acquises en formation par les diplômés de l'enseignement supérieur et quelles sont celles, en regard, qui leur sont demandées pour exercer leur emploi ? A travers une évaluation, nécessairement subjective, de leurs compétences par les jeunes diplômés eux-mêmes, les écarts entre l'acquis en formation et le requis dans l'emploi sont mis en évidence. Les résultats présentés dans ce document s'appuient sur l'interrogation, au printemps 2014, d'un échantillon expérimental de l'enquête Génération 2010 constitué de diplômés de bac+5 interrogés par Internet. Ils portent…
An Efficient Algorithm for the Generation of Z-Convex Polyominoes
2014
We present a characterization of Z-convex polyominoes in terms of pairs of suitable integer vectors. This lets us design an algorithm which generates all Z-convex polyominoes of size n in constant amortized time.
On a Non-periodic Shrinking Generator
2011
We present a new non-periodic random number generator based on the shrinking generator. The A-sequence is still generated using a LFSR, but the S-sequence is replaced by a finitely generated bi-ideal - a non-periodic sequence. The resulting pseudo-random sequence performs well in statistical tests. We show a method for the construction of an infinite number of finitely generated bi-ideals from a given A-sequence, such that the resulting sequence of the shrinking generator is nonperiodic. Further we prove the existence of what we call universal finitely generated bi-ideals that produce non-periodic words when used as the S-sequence of a shrinking generator for all non-trivial periodic A-sequ…
Fractional wavelet transform
1997
The wavelet transform, which has had a growing importance in signal and image processing, has been generalized by association with both the wavelet transform and the fractional Fourier transform. Possible implementations of the new transformation are in image compression, image transmission, transient signal processing, etc. Computer simulations demonstrate the abilities of the novel transform. Optical implementation of this transform is briefly discussed.