Search results for "DUI"

Tracking dynamics of magma migration in open-conduit systems

2016

Open-conduit volcanic systems are typically characterized by unsealed volcanic conduits feeding permanent or quasi-permanent volcanic activity. This persistent activity limits our ability to read changes in the monitored parameters, making the assessment of possible eruptive crises more difficult. We show how an integrated approach to monitoring can solve this problem, opening a new way to data interpretation. The increasing rate of explosive transients, tremor amplitude, thermal emissions of ejected tephra, and rise of the very-long-period (VLP) seismic source towards the surface are interpreted as indicating an upward migration of the magma column in response to an increased magma input r…

The percolation threshold and permeability evolution of ascending magmas

2017

Abstract The development of gas permeability in magmas is a complex phenomenon that directly influences the style of a volcanic eruption. The emergence of permeability is linked to the concept of percolation threshold, which is the point beyond which gas bubbles are connected in a continuous network that allows gas escape. Measurements of the percolation threshold, however, range from ∼30 to 78 vol%. No known combination of parameters can explain such a wide range of threshold values, which affects our understanding of the relationship between percolation and permeability. We present permeability calculations on bubble-bearing rhyolitic melts that underwent experimental decompression. Sampl…

2016

Recent gas flux measurements have shown that Strombolian explosions are often followed by periods of elevated flux, or “gas codas,” with durations of order a minute. Here we present UV camera data from 200 events recorded at Stromboli volcano to constrain the nature of these codas for the first time, providing estimates for combined explosion plus coda SO2 masses of ≈18–225 kg. Numerical simulations of gas slug ascent show that substantial proportions of the initial gas mass can be distributed into a train of “daughter bubbles” released from the base of the slug, which we suggest, generate the codas, on bursting at the surface. This process could also cause transitioning of slugs into cap b…

2017

Abstract. The aim of this study is to present a framework that provides new ways to characterize the spatio-temporal variability of lateral exchanges for water flow and solute transport in a karst conduit network during flood events, treating both the diffusive wave equation and the advection–diffusion equation with the same mathematical approach, assuming uniform lateral flow and solute transport. A solution to the inverse problem for the advection–diffusion equations is then applied to data from two successive gauging stations to simulate flows and solute exchange dynamics after recharge. The study site is the karst conduit network of the Fourbanne aquifer in the French Jura Mountains, wh…

Arduino kā instruments dizaina un tehnoloģiju apguvei 8. klasē

2022

Diplomdarba autors: Stehans Altuhovs. Diplomdarba nosaukums: Arduino kā instruments priekšmeta “Dizains un tehnoloģijas” apguvei 8. klasē Diplomdarba mērķis ir izpētīt mikrokontroliera Arduino apguves un izmantošanas iespējas mācību priekšmetā “Dizains un tehnoloģijas” 8. klases skolēniem. Darba teorētiskajā daļā tika atspoguļota esošā situācija ar mācību priekšmetam “Dizains un tehnoloģijas” pieejamo instrumentu klāstu, detalizēta šo instrumentu klasifikācija un dots instrumentu raksturojums. Darba teorētiskajā daļā tika pētīta Arduino pielietošanas prakse vispārizglītojošo mērķu sasniegšanai dažādās valstīs, piemēram, ASV, Lielbritānija, Vācija, u.c., kā tas minēts dažādos pētījumos. Darb…

The role of maternal effects in host-parasite interactions: examination of the development of the immune defense in a colonial seabird, the black-leg…

2004

One of the main aims of evolutionary biology is to understand the mechanisms responsible for the phenotypic variation on which natural selection can act. Maternal effects occur when a mother's phenotype or her environment influence her offspring's phenotype. Despite the importance of such effects for the ecology of host-parasite interactions, their role has been relatively neglected to date. In this thesis, we examined how mothers influence the immune defense of their young in an environment that varies in space and time. This work has primarily focused on a colonial seabird, the black-legged kittiwake (Rissa tridactyla). Using this model, we have first shown that specific maternal antibodi…

Analyse semio-ergonomique d'interfaces multimédias

2002

Communication affichée; National audience; Cet article présente une démarche visant à combiner les méthodes d'analyses de produits multimédia utilisées dans deux champs différents : la sémiologie et l'ergonomie. Ces méthodes complémentaires donnent des résultat dans trois principales directions d'analyse. La capacité fonctionnelle du produit, sa facilité d'utilisation et son esthétique. Dans ce contexte, des méthodes d'analyse des signes qui composent les message permettent d'évoquer des hypothèses qui sont validées ou non à l'aide des méthodes d'observation en situation.

“SmartGlass” Obstacles for Dynamic Inducing of Light Scattering in Vision Research Experiments

2017

We describe a technique that allows control of visual stimuli quality through the use of a setup with a polymer dispersed liquid crystal (PDLC) film positioned in the optical pathway of one or both human eyes. Nowadays, PDLC films allow alteration of the resolution and contrast limits of the transmitted light due to continuous change in the light scattering that is obtained by the application of an AC electrical field. In our experimental setup, the use of a wide-aperture up to area of 20 x 15 cm2 PDLC sheet is combined with a flat-screen PC display or with a modified display emission block without its interference filter unit and with an installed individually controllable colored light-em…

Effets de la variabilité interindividuelle de la salive humaine (flux et composition) sur la libération d’arômes et la perception de la flaveur chez …

2018

International audience

Four News Media Roles Shaping Agenda-building Processes

2019

This chapter identifies, defines and explores four news media roles of conduit, facilitator, mediator and political actor through which the media participate with corporate, social and political actors in agenda-building processes. The framework of the media’s four agenda-building roles sheds light on how the news media perform their various roles as well as how other actors, such as organizations and media audiences, are able to mobilize the media performing these roles. This framework helps explain how and why media roles affect the way actors are able to influence the media agenda with the intention of shaping the public agenda. peerReviewed