Search results for "gradient"

Methanotrophic activity and bacterial diversity in volcanic-geothermal soils at Pantelleria island (Italy)

2014

Abstract. Volcanic and geothermal systems emit endogenous gases by widespread degassing from soils, including CH4, a greenhouse gas twenty-five times as potent as CO2. Recently, it has been demonstrated that volcanic/geothermal soils are source of methane, but also sites of methanotrophic activity. Methanotrophs are able to consume 10–40 Tg of CH4 a−1 and to trap more than 50% of the methane degassing through the soils. We report on methane microbial oxidation in the geothermally most active site of Pantelleria island (Italy), Favara Grande, whose total methane emission was previously estimated in about 2.5 t a−1. Laboratory incubation experiments with three top-soil samples from Favara Gra…

A Review of “Volcano and geothermal tourism: sustainable georesources for leisure and recreation”

2013

A Sustainable Energy Mix for the Aeolian Islands

2018

The paper examines the current status of the electrical energy production in the Aeolian Islands, an Italian archipelago, composed by small island North of Sicily. Instead the availability of renewable energy sources, like wind, solar, geothermal and sea wave, these islands produce electrical energy using almost entirely fossil fuels. Starting from this initial condition, the paper proposes an energetic mix based on the available resources and focusing the attention on sea wave. An innovative device is presented in order to exploit this energy source.

Effet du relief sur la variabilité de descripteurs des saisons des pluies en Afrique de l’Est.

2011

6 pages; International audience; Les variations spatiales des différents descripteurs des saisons des pluies tropicales (durée, fréquence et intensitédes pluies…) sont mal connues, notamment en régions accidentées. Elles ont pourtant une réelle incidence agroclimatique.Au Kenya, ces descripteurs sont fortement contraints par la géographie, y compris aux échelles fines. L’exemple du versantest du Mont Kenya montre une gamme de conditions agro-écologiques, sous l’influence du schéma général reliantl’augmentation des pluies avec l’altitude. L’altitude influence principalement la durée des deux saisons des pluies (Long etShort rains). La fréquence des jours de pluies est également modulée par l…

Scaffolds biodegradabili in PLLA con gradiente di porosità per rigenerazione ossea

2014

DISPOSITIVO PER MISURARE UN GRADIENTE DI PRESSIONE NEL SUOLO, IN PARTICOLARE PER IL MONITORAGGIO DI SITI VULCANICI

2008

Representing Echinococcus multilocularis gradients in space and time: fox data, models, and scale dependence

2004

International audience

Ar gradientu saistītās minimizācijas metodes

2020

Bakalaura darbs veltīts vairākargumentu funkciju optimizācijas metodēm, kuras sauc par gradienta metodēm. Darbā apskatītas četras metodes: gradienta metode, gradienta projekcijas metode, nosacītā gradienta metode un stohastiskā gradienta metode. Visām metodēm pievienoti piemēri, kas ilustrē metodes darbību. Metodiska rakstura darbs.

Breakdown studies for high-gradient RF warm technology in: CLIC and hadron therapy linacs

2016

La presente tesis se centra en el estudio de las limitaciones, debidas principalmente a fenómenos de breakdowns, en el rendimiento de estructuras aceleradoras de radiofrecuencia (RF) de alto gradiente (HG) y de conductividad normal. La formación de arcos en vacío perturban los campos electromagnéticos de las cavidades, lo cual afecta en la calidad del haz de partículas acelerado. El proyecto de Compact Linear Collider (CLIC) estudia la viabilidad de un colisionador lineal electrón-positrón en la escala de energía centro de masa del TeV, y desarrolla las estructuras aceleradoras de última generación para alcanzar altos gradientes de 100 MV/m con una tasa máxima de fenómenos de breakdowns de …

Restoration and Enhancement of Historical Stereo Photos

2021

Restoration of digital visual media acquired from repositories of historical photographic and cinematographic material is of key importance for the preservation, study and transmission of the legacy of past cultures to the coming generations. In this paper, a fully automatic approach to the digital restoration of historical stereo photographs is proposed, referred to as Stacked Median Restoration plus (SMR+). The approach exploits the content redundancy in stereo pairs for detecting and fixing scratches, dust, dirt spots and many other defects in the original images, as well as improving contrast and illumination. This is done by estimating the optical flow between the images, and using it …