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Volcanic Plumes.Impacts on the Atmosphere and Insights into Volcanic Processes

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ISBN: 9783038976288 Year: Pages: 252 DOI: 10.3390/books978-3-03897-629-5 Language: eng
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Science (General)
Added to DOAB on : 2019-04-05 10:34:31
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Abstract

Volcanoes release plumes of gas and ash to the atmosphere during episodes of passive and explosive behavior. These ejecta have important implications for the chemistry and composition of the troposphere and stratosphere, with the capacity to alter Earth's radiation budget and climate system over a range of temporal and spatial scales. Volcanogenic sulphur dioxide reacts to form sulphate aerosols, which increase global albedo, e.g., by reducing surface temperatures, in addition to perturbing the formation processes and optical properties of clouds. Released halogen species can also deplete stratospheric and tropospheric ozone. Volcanic degassing, furthermore, played a key role in the formation of Earth’s atmosphere, and volcanic plumes can affect air quality, pose hazards to aviation and human health, as well as damage ecosystems. The chemical compositions and emission rates of volcanic plumes are also monitored via a range of direct-sampling and remote-sensing instrumentation, in order to gain insights into subterranean processes, in the respect of the magmatic bodies these volatiles exsolve from. Given the significant role these gases play in driving volcanic activity, e.g., via pressurisation, the study of volcanic plumes is proving to be an increasingly fruitful means of improving our understanding of volcanic systems, potentially in concert with observations from geophysics and contributions from fluid dynamical modelling of conduit dynamics.

Catalysts Deactivation, Poisoning and Regeneration

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ISBN: 9783039215461 / 9783039215478 Year: Pages: 254 DOI: 10.3390/books978-3-03921-547-8 Language: eng
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Technology (General) --- Chemical Engineering
Added to DOAB on : 2019-12-09 11:49:15
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Catalyst lifetime represents one of the most crucial economic aspects in industrial catalytic processes, due to costly shutdowns, catalyst replacements, and proper disposal of spent materials. Not surprisingly, there is considerable motivation to understand and treat catalyst deactivation, poisoning, and regeneration, which causes this research topic to continue to grow. The complexity of catalyst poisoning obviously increases along with the increasing use of biomass/waste-derived/residual feedstocks and with requirements for cleaner and novel sustainable processes. This book collects 15 research papers providing insights into several scientific and technical aspects of catalyst poisoning and deactivation, proposing more tolerant catalyst formulations, and exploring possible regeneration strategies.

Keywords

hydrogenation --- copper --- catalyst --- water --- deactivation --- octanal --- octanol --- V2O5–WO3/TiO2 catalysts --- poisoning --- sulfur-containing sodium salts --- SO3 --- NO removal --- Cu/SSZ-13 --- NH3-SCR --- sodium ions --- deactivation mechanism --- sulfur poisoning --- coke deposition --- in situ regeneration --- Co-Zn/H-Beta --- NOx reduction by C3H8 --- catalyst deactivation --- diesel --- natural gas --- SEM --- TEM --- poisoning --- oxygen storage capacity --- thermal stability --- cyclic operation --- deactivation --- oxysulfate --- oxysulfide --- Selective Catalytic Reduction (SCR) --- SO2 poisoning --- Low-temperature catalyst --- nitrogen oxides --- nitrous oxide --- dry reforming of methane --- nickel catalysts --- barium carbonate --- deactivation by coking --- catalytic methane combustion --- exhaust gas --- catalyst durability --- Liquefied natural gas --- biogas --- vehicle emission control --- sulfur deactivation --- catalyst deactivation --- aluminum sulfate --- palladium sulfate --- regeneration --- phthalic anhydride --- vanadia-titania catalyst --- unusual deactivation --- physico-chemical characterization --- over-reduction --- vanadia species --- coke deposition --- DeNOx --- MW incinerator --- deactivation --- ammonium sulfates --- regeneration --- washing --- CO2 reforming --- Ni-catalyst --- syngas --- tetragonal zirconia --- phase stabilization --- CPO reactor --- effect of flow rate --- deactivation --- iso-octane --- Rh catalysts --- Rh --- homogeneous catalysis --- catalyst deactivation --- n/a

Viticulture and Winemaking under Climate Change

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ISBN: 9783039219742 / 9783039219759 Year: Pages: 294 DOI: 10.3390/books978-3-03921-975-9 Language: eng
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Science (General) --- Meteorology and Climatology
Added to DOAB on : 2020-01-07 09:08:26
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The importance of viticulture and the winemaking socio-economic sector is acknowledged worldwide. The most renowned winemaking regions show very specific environmental characteristics, where climate usually plays a central role. Considering the strong influence of weather and climatic factors on grapevine yields and berry quality attributes, climate change may indeed significantly impact this crop. Recent trends already point to a pronounced increase in growing season mean temperatures, as well as changes in precipitation regimes, which have been influencing wine typicity across some of the most renowned winemaking regions worldwide. Moreover, several climate scenarios give evidence of enhanced stress conditions for grapevine growth until the end of the century. Although grapevines have high resilience, the clear evidence for significant climate change in the upcoming decades urges adaptation and mitigation measures to be taken by sector stakeholders. To provide hints on the abovementioned issues, we have edited a Special Issue entitled “Viticulture and Winemaking under Climate Change”. Contributions from different fields were considered, including crop and climate modeling, and potential adaptation measures against these threats. The current Special Issue allows for the expansion of scientific knowledge in these particular fields of research, as well as providing a path for future research.

Keywords

viticulture --- crop model --- phenology --- physiological processes --- climate --- micrometeorology --- microclimate --- climate change --- water limitation --- dry mass partitioning --- assimilation --- intercellular CO2 --- stomatal conductance --- leaf water potential --- Vitis vinifera L. --- production system --- S-ABA --- rate of anthocyanin accumulation --- CIRG --- bioactive compounds --- Botrytis cinerea --- low-input --- mechanical thinning --- viticultural training system --- yield formation --- leaf area --- table grapes --- photosynthesis --- berry composition --- phenolics --- natural hail --- grapevine --- phenology --- phenology modelling platform --- Touriga Franca --- Touriga Nacional --- climate change --- RCP4.5 --- EURO-CORDEX --- Douro wine region --- Portugal --- global warming --- technological and phenolic ripeness --- grape --- wine --- sensory analysis --- climate change --- elevated CO2 --- grapevine pest --- mealybug --- parasitoid --- FACE --- predawn water potential --- PRI --- remote sensing --- vineyards --- water status --- WI --- climate change --- Vitis vinifera L. --- general circulation model --- EURO-CORDEX --- phenological model --- grapevine --- Virtual Riesling --- climate change --- temperature --- plant architecture --- crop management --- modelling --- climate change --- viticulture --- adaptation --- temperature --- drought --- plant material --- rootstock --- training system --- phenology --- modeling --- Vitis vinifera --- autochthonous cultivar --- ’Uva Rey’ --- unmanned aerial vehicles --- vigour maps --- spatial variability --- normalized difference vegetation index --- crop water stress index --- crop surface model --- precision viticulture --- climate change --- multi-temporal analysis --- Vitis vinifera (L.) --- SO2 pads --- B. cinerea mold --- grape quality --- light micro-climates --- mitigation strategies --- kaolin --- irrigation --- Vitis vinifera L. --- grape berry tissues --- pulse amplitude modulated (PAM) fluorometry --- photosynthesis --- photosynthetic pigments --- viticulture --- winemaking --- climatic influence --- climate change --- adaptation measures

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MDPI - Multidisciplinary Digital Publishing Institute (3)


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eng (3)


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2019 (3)