Search results for " and losses"

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Modulational instability in resonant optical fiber with higher-order dispersion effect

2010

International audience; The modulational instability (MI) of an electromagnetic wave in a resonant optical fiber with a two-level system is investigated. In the normal dispersion regime, we find the occurrence of nonconventional MI sidebands which are induced by the two-level resonant atoms. We also observe that the MI gain spectra are suppressed by the higher-order dispersion effect in the anomalous dispersion regime.

Physics42.81.Dp Propagation scattering and losses; solitons 42.50.Ct Quantum description of interaction of light and matter; related experiments 42.81.Gs Birefringence polarizationOptical fiberWave propagationbusiness.industryNonlinear optics01 natural sciencesElectromagnetic radiationAtomic and Molecular Physics and OpticsSpectral lineElectronic Optical and Magnetic Materialslaw.invention[CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry010309 optics[CHIM.THEO] Chemical Sciences/Theoretical and/or physical chemistryModulational instabilityOpticslawOptical materials0103 physical sciencesDispersion (optics)[ CHIM.THEO ] Chemical Sciences/Theoretical and/or physical chemistry010306 general physicsbusiness
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A Cross-Cultural Exploratory Study of Health Behaviors and Wellbeing During COVID-19

2021

This study explored the influence of the COVID-19 pandemic on perceived health behaviors; physical activity, sleep, and diet behaviors, alongside associations with wellbeing. Participants were 1,140 individuals residing in the United Kingdom (n = 230), South Korea (n = 204), Finland (n = 171), Philippines (n = 132), Latin America (n = 124), Spain (n = 112), North America (n = 87), and Italy (n = 80). They completed an online survey reporting possible changes in the targeted behaviors as well as perceived changes in their physical and mental health. Multivariate analyses of covariance (MANCOVA) on the final sample (n = 1,131) revealed significant mean differences regarding perceived physical…

behavior changeMultivariate analysisLatin Americanslcsh:BF1-990hyvinvointicoronavirusExploratory researchbehaviour changeruokavaliotpandemiat03 medical and health sciences0302 clinical medicineBehavior changeterveysvaikutuksetmedicinePsychologyCross-cultural030212 general & internal medicineGeneral PsychologyOriginal Researchresources - gains and lossesBehavior changeCOVID-19kansainvälinen vertailuMental healthResourceslcsh:Psychologyinactivitykulttuurienvälinen tutkimusfood consumptionterveyskäyttäytyminenResidencemedicine.symptomresourcesPsychologyWeight gainfyysinen aktiivisuus030217 neurology & neurosurgeryDemographyFrontiers in Psychology
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