Search results for "320"
showing 10 items of 338 documents
An Agenda for Open Science in Communication
2021
Contains fulltext : 226720.pdf (Publisher’s version ) (Open Access) In the last 10 years, many canonical findings in the social sciences appear unreliable. This so-called "replication crisis" has spurred calls for open science practices, which aim to increase the reproducibility, replicability, and generalizability of findings. Communication research is subject to many of the same challenges that have caused low replicability in other fields. As a result, we propose an agenda for adopting open science practices in Communication, which includes the following seven suggestions: (1) publish materials, data, and code; (2) preregister studies and submit registered reports; (3) conduct replicatio…
Emergence of extreme events in fiber-based parametric processes driven by a partially incoherent pump wave
2009
Modulation instability (MI) generated by a picosecond coherent pulse has been recently identified as the key element of the generation of optical rogue-waves in supercontinuum-based systems [1]. Similar rare but highly energetic pulse structures can also appear in non-solitonic configurations such as Raman amplifiers driven by a partially incoherent pump wave propagating in fibres with low group velocity dispersion [2]. Therefore, one may wonder whether optical rogue-like event can also occur in MI-based amplifier because both Raman and parametric amplifiers benefit from a quasi-instantaneous gain. We provide here experimental evidence of rare optical events in a parametric amplifier in pre…
Generation of localized pulses from incoherent wave in optical fiber lines made of concatenated Mamyshev regenerators
2008
International audience; We investigate the novel properties of optical fiber lines made of Mamyshev regenerators (MRs) based on self-phase modulation and subsequent spectral filtering. In particular, we show that such a regenerator line can be used to generate random sequences of optical pulses from an incoherent wave. This behavior is related to the existence of stable eigenpulses that can propagate unchanged through the regenerator line and act as attractors for incoming pulses. By changing the regenerator parameters, we also report the existence of multiple eigenpulses and limit cycles. Finally, we demonstrate that MRs could be used as efficient nonlinear gates in fiber laser cavities.
Online Edge Flow Imputation on Networks
2022
Author's accepted manuscript © 2022 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works. An online algorithm for missing data imputation for networks with signals defined on the edges is presented. Leveraging the prior knowledge intrinsic to real-world networks, we propose a bi-level optimization scheme that exploits the causal dependencies and the flow conservation, respe…
"Decay Phase-Space Volume of Partial Waves" of "Light isovector resonances in $\pi^- p \to \pi^-\pi^-\pi^+ p$ at 190 GeV/${\it c}$"
2018
Decay phase-space volume $I_{aa}$ for the 14 selected partial waves as a function of $m_{3\pi}$, normalized such that $I_{aa}(m_{3\pi} = 2.5~\text{GeV}/c^2) = 1$. The wave index $a$ represents the quantum numbers that uniquely define the partial wave. The quantum numbers are given by the shorthand notation $J^{PC} M^\varepsilon [$isobar$] \pi L$. We use this notation to label the decay phase-space volume in the column headers. The labels are identical to the ones used in the column headers of the table of the transition amplitudes. $I_{aa}$ is calculated using Monte Carlo integration techniques for fixed $m_{3\pi}$ values, which are given in the first column, in the range from 0.5 to 2.5 Ge…
"Transition Amplitudes" of "Light isovector resonances in $\pi^- p \to \pi^-\pi^-\pi^+ p$ at 190 GeV/${\it c}$"
2018
Real and imaginary parts of the normalized transition amplitudes $\mathcal{T}_a$ of the 14 selected partial waves in the 1100 $(m_{3\pi}, t')$ cells (see Eq. (12) in the paper). The wave index $a$ represents the quantum numbers that uniquely define the partial wave. The quantum numbers are given by the shorthand notation $J^{PC} M^\varepsilon [$isobar$] \pi L$. We use this notation to label the transition amplitudes in the column headers. The $m_{3\pi}$ values that are given in the first column correspond to the bin centers. Each of the 100 $m_{3\pi}$ bins is 20 MeV/$c^2$ wide. Since the 11 $t'$ bins are non-equidistant, the lower and upper bounds of each $t'$ bin are given in the column he…
Embedded students? Can libraries benefit from students having work placements in the library in planning library instruction?
2019
This article discusses how students can be more integrated in developing library instruction and what advantages that can provide for librarians planning their teaching. The students seem to have a different starting point as to how important the librarians’ knowledge of the subject at hand is and whether or not library instruction should be an integrated part of the course.
Disinformation in Facebook Ads in the 2019 Spanish General Election Campaigns
2021
Producción Científica
Social capital and the networked public sphere: Implications for political social media sites
2012
Submitted version of a paper from the 45th Hawaii International Conference on System Science (HICSS), 2012. Published version available from IEEE: http://dx.doi.org/10.1109/hicss.2012.535 This paper presents a theoretical lens for research on social media use in eParticipation, along with an example case study. The idea of the public sphere and how it can be applied to eParticipation research is presented. The public sphere is discussed in relation to Castell's notion of the network society as the "networked public sphere", and social capital is introduced as a possible explanation for why some people choose to participate while others refrain from doing so. An example case is presented and…
Journalists’ Associations as Political Instruments in Central and Eastern Europe
2017
This editorial provides the overall context for the five cases—three national and two international—covered in this thematic issue. While the cases are from Central and Eastern Europe (CEE), they highlight fundamental questions of journalism everywhere, including contradictions between freedom and control, professionalism and politics, individual and collective. The associations of journalists serve as very useful platforms to study these questions, especially at historical turning points when the whole political system changed, as happened twice in CEE after World War II.