Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 48 for “"CO2 uptake"”.
-
CO2 Adsorption on Polyethylenimine-Impregnated Lamellar Silica
… quantities of anthropogenic carbon dioxide (CO2). This work is contributed towards the development of efficient, amine-containing, lamellar structured silica adsorbents for CO2 removal. Seven different materials were prepared by impregnation of various amounts of PEI, over as synthesized, or …
-
Understanding modelled sea-air CO2 flux biases in the Southern Ocean through the seasonal cycle
… vital component of the earth system as a sink of CO2 and heat, taking over 40% of the annual oceanic CO2 uptake (75% of global heat uptake), slowing down the accumulation of CO2 in the atmosphere and thus the rate of climate change. However, recent studies based on the Coupled Model …
-
Engineering bacterial magnetic nanoparticles
… by doping with divalent metals such as Ni2+ or Co2+ for a variety of applications. The specific objective of this study was to genetically engineer E. coli strains which accumulate intracellular Ni2+ or Co2+ in order to manipulate the magnetic properties of the magnetosomes. Three E. coli …
-
Engineering cyanobacterial genes into Glycine max (soybean) leads to increased photosynthesis and productivity
… two years of field trials in current and future [CO2] (585-590 μmol mol-1) to determine the potential of improving an already highly productive C3 crop species. The ictB gene was expected to facilitate bicarbonate transfer across the plastid membrane, thereby increasing [CO2] within the stroma and …
-
Carbon Dioxide Capture with K-Promoted HTLC at High Temperature
… greenhouse gas such CH4, N2O and most especially CO2. A viable technology that economically and efficiently captures and concentrates CO2 from various stack and process streams is highly needed. Various cyclic adsorption processed are showing some promise as economic feasible options for CO2 …
-
Synthesis and Characterization of Nanoporous Copolymers with Potential Gas Storage Applications
… using the impregnation method. Sorption of CO2 by these materials was tested using TGA and compared with control samples. Both high amine content and certain levels of surface area were found to be important for a sorbent to achieve high CO2 uptake. Highest CO2 uptake (12 wt%) under our …
-
Non-growing season CO2 fluxes of a boreal fen – key drivers and responses to anomalous winter conditions
… analyse the non-growing season carbon dioxide (CO2) fluxes together with environmental and meteorological variables at Siikaneva fen in Southern Finland. Generally, the fen acted as a sink of CO2 with a mean annual carbon balance of -50.9 (± 39.4) g C m-2 . On average, the CO2 emissions during …
-
Exploring Pressure-Induced Structural Changes and CO2 Adsorption in Flexible Metal-Organic Frameworks
… novel hybrid porous materials. Their reversible CO2 adsorption capabilities have marked them as promising candidates for selective carbon capture. Flexible MOFs feature dynamic frameworks that can reversibly change structure in response to external stimuli, thereby exhibiting unique performance …
-
An Ecophysiological study of two key grass species, Anthephora Pubescens Nees and Eragrostis Curvula (Schrad.) Nees
… allocation was absent. A decrease in net co2 uptake rate per unit leaf area, exhibited by both species, coincided with a decrease in leaf production per plant. Increasing competition resulted in retarded relative growth rates and restricted morphological development. A field survey …
-
Determining timescales of natural carbonation of peridotite in the Samail Ophiolite, Sultanate of Oman
… to mitigate the buildup of anthropogenic CO2 emissions in the atmosphere. Timescales of natural carbonation of peridotite were investigated in the mantle layer of the Samail Ophiolite, Sultanate of Oman. Rates of ongoing, low-temperature CO2 uptake were estimated through 14C and 230Th …
-
Accelerated carbonation of wastes and minerals
… ACT has also potential for storing anthropogenic CO2 emissions into mineral silicates and alkaline waste residues via mineral or waste carbonation. Compared to ocean and geological storage, mineral and waste carbonation offer several advantages such as long-term storage and low monitoring …
-
Water relations, carbon fixation and growth rates of two leaf succulent species under different water regimes
… adopted day time stomatal opening a and CO2 uptake. This strategy and in general the high tolerance to water stress shown by R.multiflora allowed it to outcompete R.carolii on the arid, exposed, North facing slope.
-
Investigating the parameters of metal-organic framework crystal growth control for reverse osmosis membrane nanofillers and direct air capture of CO2
… also considered for the commercial scale-up of CO2 direct air capture (DAC) solid sorbents, including UiO-66, MIL-101-Cr, and Mg-MOF-74, to preserve CO2 uptake capacities between lab and industrial scales.
-
The Combined Effect of Ocean Acidification and Euthrophication on water pH and Aragonite Saturation State in the Northern Gulf of Mexico
Rising atmospheric carbon dioxide (CO2) concentrations are increasing the rate at which anthropogenic CO2 is accumulating in the ocean, and thereby acidifying ocean water. However, accumulation of anthropogenic CO2 is not the only process affecting coastal oceans. Anthropogenic inputs of nutrients …
-
Computational optimization of phase change materials on adsorbed carbon dioxide capture systems
Carbon dioxide (CO2) capture and sequester remains a critical area of research in chemical engineering. Novel sorbent/substrate structuring and novel sorbent compositing are emerging fields of research for advancing the efficiency of adsorbent-based capture technologies and establishing the …
-
Techno-economic analysis of furfural derivatives in integrated sugarcane biorefineries
… (UCT) cultivation dataset, which incorporated CO2 uptake during cane growth, was applied. Conversely, 1G scenarios exhibited higher and more variable emissions, with the MAH scenario exceeding fossil benchmarks by 11%, demonstrating that MSP alone was insufficient for determining overall …
-
Sustainable management of natural stone waste. A proposed re-use for the production of mortars and the assessment of their potential CO2 sequestration capacity
… the production of mortars by investigating their CO2 sequestration capacity, since a percentage of CO2 emissions from the production of mortars is reabsorbed as the mortar hardens, owing to carbonation. Indeed, Portland cement production is responsible for 7% of annual CO2 emissions, due to the …
-
The role of guard cell chloroplasts in stomatal function and coordinating stomatal and mesophyll responses .
… exchange of gas takes place by balancing between CO2 uptake for photosynthesis and water loss through transpiration leading to ultimate plant water use efficiency (WUE). Climate change is predicted to lead to greater temperatures and reduced water availability resulting in adverse effect on plant …
-
Dynamic interactions between CO2 efflu, sap flow and internal CO2 concentration in tree stems: implications towards the assessment of actual stem respiration
… order to verify whether forests are net sinks of CO2, it is necessary to accurately quantify the photosynthesis (CO2 uptake) and respiration (CO2 release) by trees. The objective of the Ph.D. was to perform fundamental research on dynamics in respiration of tree stems. It became clear that …
-
How does plankton distribution and activity influence the variability of carbon dioxide uptake in the North Atlantic?
… analyse the variability of the carbon dioxide (CO2) sink in the North Atlantic at a range of spatial and temporal scales. Phytoplankton indices collected from the continuous plankton recorder (CPR) and the concentration of CO2 within the surface waters show that at seasonal time-scales …
Page 1 of 3