Search results for "Timo"
showing 10 items of 2111 documents
Naturalizzazione, mente e conoscenza
2009
Naturalizzazione, mente e conoscenza - A controversial issue regarding Quine’s naturalised epistemology is that it may involve some form of reductionism. This article focuses on one of these forms, analysing the interplay of his philosophy of mind and epistemology. It aims to show that if we take into proper consideration the way in which the version of anomalous monism embraced affects his conception of mental states like sensations and propositional attitudes, Quine’s philosophy of mind should be regarded as anti-reductionist. Through a discussion of his theory of perception, I try to argue that what is entailed by it is, in a sense only partially accepted by Quine himself, that neither p…
Talking about something real: the concept of truth in multimodal non-fiction books for young people
2016
AbstractWithin social semiotics we discuss how different semiotic resources alone or in multimodal texts are used to communicate truth. This is one of the parts of the multimodal theory that are least developed and discussed. The discussion on truth within social semiotics is mainly focused on the relationship between a corresponding type of truth that is common in natural science and a more everyday perception of truth. This can give an incomplete and stereotypical image of how truth is portrayed. This essay attempts to nuance the picture by suggesting that our theoretical conceptions of how we portray truth visually can be nuanced and developed by combining the theory of multimodality wit…
Liikunnallisuus ja hyvä kunto ehkäisevät tyypin 2 diabetesta ja valtimotautien riskitekijöitä lapsesta lähtien
2021
Lasten ylipaino on saavuttanut epidemian mittasuhteet maailmanlaajuisesti. Vaikka viime vuosina tilanne on hiukan parantunut, ylipaino on edelleen yksi merkittävimmistä kansanterveydellisistä ongelmista. Riskitekijöiden kasautumisen ehkäisy ja hoito tulisi aloittaa mahdollisimman varhain: mielellään jo sikiöaikana tai viimeistään varhaislapsuudessa. nonPeerReviewed
1 Tb/s·km WDM transmission over multimode fibre link
2008
We demonstrate 1 Tb/smiddotkm WDM error-free transmission (highest reported value to our knowledge) over a MMF link by a combination of low-linewidth lasers and central launch.
Non-local stiffness and damping models for shear-deformable beams
2013
This paper presents the dynamics of a non-local Timoshenko beam. The key assumption involves modeling non-local effects as long-range volume forces and moments mutually exerted by non-adjacent beam segments, that contribute to the equilibrium of any beam segment along with the classical local stress resultants. Elastic and viscous long-range volume forces/moments are endowed in the model. They are built as linearly depending on the product of the volumes of the interacting beam segments and on generalized measures of their relative motion, based on the pure deformation modes of the beam. Attenuation functions governing the space decay of the non-local effects are introduced. Numerical resul…
Adaptive Kerr-Assisted Transverse Mode Selection in Multimode Fibers
2019
Multimode optical fibers (MMFs) have recently regained interest because of the degrees of freedom associated with their different eigenmodes. In the nonlinear propagation regime in particular, new phenomena have been unveiled in graded-index (GRIN) MMFs such as geometric parametric instabilities and Kerr beam self-cleaning [1, 2]. The speckled pattern observed at the output of the MMF at low powers, is transformed at high powers into a bell-shaped beam close to the fundamental mode. Recent work has also demonstrated that Kerr beam self-cleaning can lead to a low-order spatial mode, different from a bell-shape, by adjusting the laser beam in-coupling conditions [3]. An attractive way to syst…
Modal attraction on low order modes by Kerr effect in a graded refractive index multimode fiber
2018
Modal attraction towards low order modes in a GRIN multimode fiber was experimentally observed at high power and characterized, thus enriching the dynamics of the Kerr self-cleaning effect leading to quasi fundamental mode generation.
Spatiotemporal light-beam compression from nonlinear mode coupling
2017
We experimentally demonstrate simultaneous spatial and temporal compression in the propagation of light pulses in multimode nonlinear optical fibers. We reveal that the spatial beam self-cleaning recently discovered in graded-index multimode fibers is accompanied by significant temporal reshaping and up to four-fold shortening of the injected sub-nanosecond laser pulses. Since the nonlinear coupling among the modes strongly depends on the instantaneous power, we explore the entire range of the nonlinear dynamics with a single optical pulse, where the optical power is continuously varied across the pulse profile.
Nonlinear Multimode Fiber Optics
2018
We overview recent advances in the nonlinear optics of multimode optical fibers, including ultrabroadband sideband and supercontinuum generation, Kerr and Raman beam cleanup, modal modulation instabilities, four wave mixing, and second harmonic beam cleaning.
Spatial Beam Evolution in Nonlinear Multimode Fibers
2021
We discuss some recent results illustrating the role of input wave-front shaping, propagation dynamics and output beam diagnostics in order to observe spatial beam cleaning in nonlinear multimode fibers and amplifiers.