Search results for "AAS"

Review of carbon emissions offsetting guidelines using instructional criteria

2023

Abstract Purpose Carbon offsetting is one of the tools that companies can use to achieve their climate targets. The ability of a company to offset its emissions successfully depends on the availability and quality of guidance on the subject. This study explores how well existing offsetting guidelines equip corporations to achieve successful emissions offsetting. Methods Instructional criteria were developed and used to evaluate seven guidelines. The contents of each guideline were assessed based on how they instruct a company to achieve emissions offsetting that fulfills five criteria for appropriate offsetting: target affiliation, Paris compatibility, effectiveness, prioritizing removals, …

The ABCflux database: Arctic-boreal CO2flux observations and ancillary information aggregated to monthly time steps across terrestrial ecosystems

2022

Past efforts to synthesize and quantify the magnitude and change in carbon dioxide (CO2) fluxes in terrestrial ecosystems across the rapidly warming Arctic–boreal zone (ABZ) have provided valuable information but were limited in their geographical and temporal coverage. Furthermore, these efforts have been based on data aggregated over varying time periods, often with only minimal site ancillary data, thus limiting their potential to be used in large-scale carbon budget assessments. To bridge these gaps, we developed a standardized monthly database of Arctic–boreal CO2 fluxes (ABCflux) that aggregates in situ measurements of terrestrial net ecosystem CO2 exchange and its derived partitioned…

Exploring CO2 hydrogenation to methanol at a CuZn–ZrO2 interface via DFT calculations

2023

Multi-component heterogeneous catalysts are among the top candidates for converting greenhouse gases into valuable compounds. Combinations of Cu, Zn, and ZrO2 (CZZ) have emerged as promisingly efficient catalysts for CO2 hydrogenation to methanol. To explore the catalytic mechanism, density functional theory (DFT) calculations and the energetic span model (ESM) were used to study CO2 conversion routes to methanol on CuZn–ZrO2 interfaces with a varying Zn content. Our results demonstrate that the presence of Zn sites at the interface improves CO2 binding. However, the adsorption and activation energies are insensitive to Zn concentration. The calculations also show that the hydrogenation of …

The influence of lipid content and taxonomic affiliation on methane and carbon dioxide production from phytoplankton biomass in lake sediment

2021

The greenhouse gases methane (CH4) and carbon dioxide (CO2) are end products of microbial anaerobic degradation of organic matter (OM) in lake sediments. Although previous research has shown that phytoplankton lipid content influences sediment methanogenesis, current understanding on how OM quality affects methanogenesis is still limited. Such information is needed to more accurately assess how lake greenhouse gas emissions may change in response to anthropogenic activities. We cultured 11 phytoplankton species from five classes and studied how taxonomic identity, C : N ratio, lipid content, and fatty acid composition of phytoplankton biomass affects the CH4 and net CO2 production in anaero…

Responsibilities for just transition to low-carbon societies : a role-based framework

2022

Low-carbon transitions in industrialised societies will have significant social, economic and environmental impacts, raising concerns of justice. Calls for urgent transitions evoke a question about the roles of different actors in advancing transitions and ensuring they are just. While the responsibilities for emission mitigation have been long discussed, responsibilities for making a just transition have not. The question about responsibilities is particularly pressing because of the diverse constellation of actors involved in climate action, including diverse forms of non-state actors from city-level and business alliances to grassroots activists. We examine the responsibilities of state …

Selective gas adsorption by calixarene-based porous octahedral M32 coordination cages

2022

Giant octahedral M32 coordination cages were prepared via self-assembly of sulfonylcalix[4]arene-supported tetranuclear M(II) clusters (M = Co, Ni) with hybrid linker based on tris(dipyrrinato)cobalt(III) complexes appended with peripherical carboxylic groups. Due to intrinsic and extrinsic porosity, the obtained solid-state supramolecular architectures demonstrated good performance as adsorbents for the separation of industrially important gases mixtures. peerReviewed

Antimonin määrittämisestä

2008

New applications of zoobenthos measurements for risk assessment of chemicals in aquatic ecosystems

2015

Artikkeliväitöskirja. Yhteenveto-osa ja viisi artikkelia. (Artikkelit eivät avoimesti saatavilla.) Article dissertation. An introduction and five articles (not available in this version). Benthic animals in aquatic ecosystems suffer from various anthropogenic pollutants. A challenge in risk assessment of chemicals in aquatic ecosystems (i.e. ecological risk assessment) has been to balance cost-efficiency and effectiveness in detecting early warning signals of chemicals. In this study, hyperspectral imaging and behavioural measurements were evaluated as novel applications for detecting chemical effects on benthic animals, and the reliability of the incidence of chironomid morphological defor…

Mitä siihen vielä vaaditaan? : pro gradu -tutkielma neljän nuoren somalinaisen kokemasta toiseudesta suomalaisessa yhteiskunnassa

2016

TIIVISTELMÄ MITÄ SIIHEN VIELÄ VAADITAAN? Pro gradu -tutkielma neljän nuoren somalinaisen kokemasta toiseudesta suomalaisessa yhteiskunnassa Nina Östergård Kokkolan yliopistokeskus Chydenius Sosiaalityön pro gradu -tutkielma Jyväskylän yliopisto Ohjaaja: Tuomo Kokkonen Syksy 2016 104 sivua _________________________________________________________________________ Tämän sosiaalityön pro gradu -tutkielman tarkoituksena oli tutkia nuorten somalinaisten kokemaa toiseutta suomalaisessa yhteiskunnassa. Tutkimus selvittää, kokevatko he olevansa hyväksyttyjä ja tasavertaisia kansalaisia yhteiskunnassamme vai kokevatko he olevansa ulkopuolisia. Tutkimusaihetta lähestyin toiseuden käsitteen kautta. Läh…

Hudožestvennoe ubranstvo cerkvej Valaamskogo monastryrâ XVII - načala XIX veka

2016

The collection of church art of the Valamo monastery belongs to worthy rarities. Due to the evacuation from Karelia to Finland, collection survived almost complete. Despite the fact that the collection is well known to specialists in Finland and Russia, the research processes is just beginning. Especially little information exists about the icons of earlier period than of the 18th century. Almost nothing is known about the number of them, neither origins nor something about the painters of them. Many icons of the 18th century from the Valamo’s collection decorated the monastery churches. For this reason, the focus of this dissertation is the decoration of the main interiors of the Cathedral…