Search results for "Time duration"

showing 3 items of 3 documents

Parametric Frequency Conversion of Short Optical Pulses Controlled by a CW Background

2007

International audience; We predict that parametric sum-frequency generation of an ultra-short pulse may result from the mixing of an ultra-short optical pulse with a quasi-continuous wave control. We analytically show that the intensity, time duration and group velocity of the generated idler pulse may be controlled in a stable manner by adjusting the intensity level of the background pump.

Materials sciencebusiness.industryoptical pulseFOS: Physical sciencesPhysics::OpticsTime duration01 natural sciencesAtomic and Molecular Physics and OpticsIntensity (physics)Pulse (physics)010309 opticsFrequency conversionOptics0103 physical sciencescontinuous wave lasersGroup velocityoptical pulse; light; continuous wave laserslight010306 general physicsbusinessMixing (physics)Optics (physics.optics)Parametric statisticsPhysics - Optics
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Structural properties of the range-II- and range-III order in amorphous-SiO2 probed by electron paramagnetic resonance and Raman spectroscopy

2010

In the present work we report an experimental investigation by electron paramagnetic resonance spectroscopy on the hyperfine structure of the E. point defect, probing the local arrangement of the network (range-II order), and by Raman spectroscopy on the D 1 and D 2 lines, probing mean features of the network (range-III order). Our studies, performed on a-SiO 2 samples thermally treated at 1000 °C in air for different time durations, show that changes of the hyperfine structure and of the D 1 and D 2 lines occur in a correlated way. These results give strong evidence that the range-II and range-III order properties are intimately related to each other and that these properties are determine…

Raman scatteringMaterials scienceSolid-state physicsAnalytical chemistryParamagnetic materiallaw.inventionPoint defectsymbols.namesakeNuclear magnetic resonancelawElectron spin resonance spectroscopyElectron paramagnetic resonanceHyperfine structureParamagnetic resonanceExperimental investigationSettore FIS/01 - Fisica SperimentaleElectron resonanceSilicon compoundCondensed Matter PhysicsCrystallographic defectElectronic Optical and Magnetic MaterialsAmorphous solidMolecular geometryRaman spectroscopysymbolsHyperfine structureElectron paramagnetic resonanceTime durationRaman spectroscopyRaman scatteringElectron paramagnetic resonance spectroscopySilica difetti di punto proprieta' struturali
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MIGRATION OF THE HIGHLY EDUCATED: EVIDENCE FROM RESIDENCE SPELLS OF UNIVERSITY GRADUATES*

2011

We examine the inter-regional migration of university graduates from 1991 to 2003 in Finland. The results show that time matters: two-years before and during the graduation year the hazard rates of migration increase, and then decrease thereafter. Although university graduates are particularly mobile, we find that most of them do not move from their region of studies within 10 years after graduation. The out-migration, i.e., brain drain, is much higher among graduates in the more peripheral universities than in the growth centers (Helsinki in particular). Migration is also substantially more likely for those studying away from the home region than for those studying at home. peerReviewed

onward migrationdiscrete-time duration analysisreturn migrationasumusjaksojen pituudetBrain drainkorkeakoulutusEnvironmental Science (miscellaneous)DevelopmentmuuttoliikeHazardGeographyhigher educationDemographic economicsResidenceresidence spellsyliopistosta valmistuneetMigrationuniversity graduatesGraduationJournal of Regional Science
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