Search results for "EXCHANGE"
showing 10 items of 2035 documents
Global sea-to-air flux climatology for bromoform, dibromomethane and methyl iodide
2013
Volatile halogenated organic compounds containing bromine and iodine, which are naturally produced in the ocean, are involved in ozone depletion in both the troposphere and stratosphere. Three prominent compounds transporting large amounts of marine halogens into the atmosphere are bromoform (CHBr3), dibromomethane (CH2Br2) and methyl iodide (CH3I). The input of marine halogens to the stratosphere has been estimated from observations and modelling studies using low-resolution oceanic emission scenarios derived from top-down approaches. In order to improve emission inventory estimates, we calculate data-based high resolution global sea-to-air flux estimates of these compounds from surface ob…
Toward the Identification of Two Glycoproteins Involved in the Stomatal Deregulation of Downy Mildew–Infected Grapevine Leaves
2015
SPE Pôle IPM UB; International audience; Stomata remain abnormally opened and unresponsive to abscisic acid in grapevine leaves infected by downy mildew. This deregulation occurs from 3 days post inoculation and increases concomitantly with leaf colonization by the pathogen. Using epidermal peels, we demonstrated that the active compound involved in this deregulation is located in the apoplast. Biochemical assays showed that the active compound present in the apoplastic fluids isolated from Plasmopara viticola infected grapevine leaves (IAF) is a CysCys bridge-independent, thermostable and glycosylated protein. Fractionation guided assays based on chromatography / stomatal response and prot…
Pd-Cu catalysts supported on anion exchange resin for the simultaneous catalytic reduction of nitrate ions and reductive dehalogenation of organochlo…
2019
International audience; The present work proposes the simultaneous removal of these classes of pollutants by a catalytic hydrotreatment processes. For this purpose, bimetallic Pd-Cu catalysts (with mass ratio Pd:Cu of 4:1) supported on macroporous strong base anion resin were prepared by different methods. The catalysts were characterized (by XRD, SEMEDX, XPS, AAS and H-2 chemisorption) and tested in a continuous flow system. The selected catalyst preparation protocol consists in a two-step method, which implies the deposition of palladium by ion exchange and the subsequent deposition of copper by controlled reaction on the surface of the pre-reduced palladium. The effectiveness of the cata…
Ressources naturelles et développement dans le monde tropical : les contradictions entre dynamiques écologiques, reproduction sociale et ordre économ…
2013
Natural resources are in the midst of contradictory dynamics. While they are essential to the reproduction of societies and life, actual organization of the world economy subordinates them to logics of accumulation. In addition to the fact that these logics don't take into account (consider) the physical limits inside of which humanity evolves, they induce problematic socio-ecological inequalities at different scales. Indeed, actual international economic order tends to generate ecologically unequal exchanges, which disrupt the development of primary exporting countries and threaten the most vulnerable populations and ecosystems inside of them.Tropics are the typical context in which such c…
University Governance and Finance: The Impact of Changes in Resource Allocation on Decision Making Structures
2002
When trying to account for changes that take place over time in the structure of any organisation, social scientists often use a conceptual framework known as resource dependency theory. This theory assumes that organisations survive only if they are able to react to changes that occur in the world around them in order to obtain the resources they need to stay in operation. Since they have the capacity for independent action, organisations are not passively shaped by their environment; they sometimes are also able to influence it.
Quantification of land-atmosphere exchanges of water, energy and carbon dioxide in space and time over the heterogeneous Barrax site
2008
International audience; To advance our understanding of land-atmosphere exchanges of water, energy and carbon dioxide (CO2) in space and time over heterogeneous land surfaces, two intensive field campaigns were carried out at the Barrax agricultural test site in Spain during 12-21 July 2004 (SPARC 2004) and 8-14 July 2005 (SEN2FLEX 2005) involving multiple field, satellite and airborne instruments for characterizing the state of the atmosphere, the vegetation and the soil from the visible to the microwave range of the spectrum. Part of the experimental area is a core site of area 25 km2, within which numerous crops are grown, on both irrigated and dry land, alongside fields of bare soil. Th…
Effect of fertilisation on the changes of soil pH and exchangeable aluminium content in soil
2015
W pracy oceniono stopień zakwaszenia gleby oraz zawartość glinu wymiennego w zależności od rodzaju zastosowanego nawozu mineralnego oraz jego dawki. Badania prowadzono w oparciu o doświadczenie wazonowe z jęczmieniem jarym odmiany browarniczej Propino. Uzyskane wyniki wskazują, że największe zakwaszenie oraz największe zawartości glinu wymiennego stwierdza się w warunkach stosowania nawożenia w kombinacji NPK wraz z saletrą amonową. Zastosowany w różnych dawkach siarczan wapnia dwuwodny nie wpłynął na zmianę odczynu gleby, a odnotowana zawartość glinu wymiennego była niższa niż w kombinacji NPK wraz z saletrą amonową.
Apmaiņas programmas skolēnu starpkultūru saskarsmes prasmju attīstībai vidusskolā
2018
Multikulturālisms mūsdienu sabiedrībā vairs nav reta parādība globalizācijas dēl, kas novērojama visā pasaulē. Tādējādi ir nepieciešams attīstīt starpkultūru saskarsmes prasmes skolēniem, tās sniegs iespēju dažādu kultūru indivīdiem efektīvi un bez aizspriedumiem sadarboties savā starpā. Maģistra darba mērķis bija noskaidrot, kā apmaiņas programmas veicina skolēnu starpkultūru saskarsmes prasmju attīstību. Darbā izmantotā pētniecības metode ir gadījuma pētījums, kas sniedza iespēju autorei apkopot skolēnu pildīto testu un aptauju datus, kā arī analizēt skolotāju intervijas. Pētījuma rezultāti apstiprina, ka apmaiņas programmas ir nozīmīgas un lietderīgas skolēnu mācību procesā, kā arī snied…
Hypotheses engineering : first essential steps of experiment-driven software development
2019
Recent studies have proposed the use of experiments to guide software development in order to build features that the user really wants. Some authors argue that this approach represents a new way to develop software that is different from the traditional requirement-driven one. In this position paper, we propose the discipline of Hypotheses Engineering in comparison to Requirements Engineering, highlighting the importance of proper handling hypotheses that guide experiments. We derive a set of practices within this discipline and present how the literature has tackled them up to now. Finally, we propose a set of research questions that could guide future work towards helping practitioners. …
The 1-way on-line coupled atmospheric chemistry model system MECO(n) – Part 2: On-line coupling with the Multi-Model-Driver (MMD)
2012
A new, highly flexible model system for the seamless dynamical down-scaling of meteorological and chemical processes from the global to the meso-γ scale is presented. A global model and a cascade of an arbitrary number of limited-area model instances run concurrently in the same parallel environment, in which the coarser grained instances provide the boundary data for the finer grained instances. Thus, disk-space intensive and time consuming intermediate and pre-processing steps are entirely avoided and the time interpolation errors of common off-line nesting approaches are minimised. More specifically, the regional model COSMO of the German Weather Service (DWD) is nested on-line into the …