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.
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Showing 1 to 20 of 95 for “"CO2 Concentration"”.
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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 …
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Improving the indoor air quality (IAQ) through application of the air cleaning technologies for offices building simulated in environmental chamber
… air velocity, air flow rate, pressure drop, CO2 concentration and particle matters PM 10 and PM 2.5 concentration for upstream and downstream were considered in this study. These variables were measured inside the chamber using IAQ devices and these data were used as an input data for …
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Soft Sensing-Driven CO<sub>2</sub> Predictive Models in Educational Buildings
… in occupant well-being. Among various factors, CO2 concentration impacts the productivity and cognitive functions of occupants. Different strategies can be utilized to improve IAQ, including context-aware ventilation, air purification technologies, and integration of indoor plants. Existing …
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Advection at a forest site – an updated approach
The exchange of carbon dioxide (CO2) across the vegetation-atmosphere interface of a spruce forest was investigated. Horizontal and vertical advection are recognized as important terms of the Net Ecosystem Exchange (NEE) budget in addition to the commonly measured turbulent flux and storage flux. …
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Soil Respiration of Native Saskatchewan Grassland Calculated from Carbon Dioxide Concentration Profiles
… to monitor soil respiration by measuring CO2 concentrations in soil throughout the growing season. The technique of gas chromatography was used to obtain CO2 concentration profiles on native grassland and cultivated soils. The CO2 concentration gradients were then used to calculate CO2 …
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Climate Change and the Exhaustion of Fossil Energy and Mineral Resources
… a limit to the total amount of anthropogenic CO2 that will be emitted into the atmosphere and therefore constraints future global warming. Here we assess the implications of fossil fuels depletion on future changes of atmospheric CO2 concentration and global-mean temperature. We find that, …
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Investigation of the Influence of Temperature Inversions and Turbulence on Land-atmosphere Interactions for Rolling Terrain
… such as heat, moisture, and carbon dioxide (CO2) were designed to work best in horizontally uniform, flat terrain. This is a challenge for measuring surface fluxes in non-uniform, complex terrain as these models break down especially during stable atmospheric conditions. The complex terrain …
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Growth of Chlorella vulgaris and Chlamydomonas reinhardtii for biodiesel production and carbon dioxide capture
… from 100 to 600 micromol photons/m 2s, and CO2 concentrations ranging from 0.038% (ambient) to 12%, were tested. WC medium at pH 8 buffered with glycylglycine sustained the highest yield and best buffering capacity for growth of both C. vulgaris and C. reinhardtii. A light intensity of 200 …
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The effects of water quality on the growth of lumpfish (Cyclopterus lumpus)
… The water quality parameters studied were CO2, total ammonia nitrogen (TAN – nitrogen bound as either NH3 or NH4+) and pH. The results indicate that pH in the range tested (7.2-7.8) does not directly affect the growth of lumpfish. However, reduced pH can increase the CO2 concentration which …
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Ripening behaviour of capsicum (Capsicum annuum L.) fruit.
… internal ethylene (C2H4) and carbon dioxide (CO2) concentration, extractable colour, 1-aminocyclopropane-1-carboxylic acid (ACC) synthase and oxidase activity, and total soluble solid content (TSSC) were studied during storage. There was very limited involvement of C2H4 during ripening of …
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Sensory Ecology of Carbon Dioxide Perception in Leaf-cutting Ants
The study examines the sensory ecology of CO2 perception in leaf-cutting ants. It begins with the ecological role of CO2 for leaf-cutting ants. Inside the subterranean nests of Atta vollenweideri large amounts of CO2 are produced by the ants and their symbiotic fungus. Measurements in field nest at …
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The role of NAD+ compartmentation and dynamics in Arabidopsis thaliana
… between NAD+ transport and elevated atmospheric CO2 concentration and (3) NAD + dynamics in vivo under different environmental cues. The results indicate that NAD negatively regulates stomatal development in cotyledons of Arabidopsis. Seedlings with reduced expression of mitochondrial (NDT1 and …
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STUDIES ON THE REACTION OF HIGH-DOSE HYDROXOCOBALAMIN AND ASCORBIC ACID WITH CARBON MONOXIDE: IMPLICATIONS FOR TREATMENT OF CARBON MONOXIDE POISONING
… should be capable of producing carbon dioxide (CO2) from carbon monoxide (CO) in blood, and that this conversion should be detectable. Using resonance raman spectroscopy we demonstrated that a mixture of hydroxocobalamin and ascorbic acid could create the reduced form of hydroxocobalamin. We …
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A study on the impact of global replacement of fossil fuel based electricity generation, transportation and domestic heating with nuclear generated electricity using a modified VENSIM DICE model
… climate change – notably ongoing accumulation of CO2 in the atmosphere by burning fossil fuels (FF). In this thesis, different transition scenarios were investigated in replacement of FF electricity generation, vehicle transport and domestic heating, using the macro-economic Dynamic Integrated …
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Interactions of the Terrestrial Biosphere With Climate and Atmospheric Chemistry
… observed climate and atmospheric carbon dioxide (CO2) concentration during the period 1971--1990 is assessed using IBIS. Model results indicate that the combined fluctuations in climate and atmospheric CO2 during 1971 to 1990 caused significant interannual and seasonal variability in global …
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Structural Investigation On The Thermal Degradation Of Aqueous Amines In Post-Combustion Co2 Capture
… temperature is with the elevating levels of CO2 in the atmosphere. Combustion of fossil fuels in power plants is a leading contributor to the elevated anthropogenic CO2 concentration. To help alleviate this issue, the investigation of aqueous amines being implemented for the capture of CO2 in …
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Laser absorption spectroscopy for investigation of hypersonic propulsion
… to measure temperature and nitric oxide (NO) concentration. Another fundamental challenge associated with scramjet operation is achieving efficient fuel-air mixing and ignition within the short residence times of a scramjet combustor. Because thrust generation is strongly influenced by …
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Linking soil respiration to hydrologic conditions and climate change
… the largest terrestrial sources of atmospheric CO2 and shifts in the rate of this flux poses one of the largest potential impacts on global warming. Previous studies have found that temperature and soil moisture contents exert first order controls on soil carbon respiration rate using both …
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Measurement of interior green space and its impact on indoor environmental quality
… measure the impact of interior plants on CO2 concentration, air temperature and relative humidity in office settings; and to evaluate the effects of indoor plants on hygrothermal comfort in naturally ventilated and air-conditioned office environments. In the first part of this thesis I …
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Regulatory mechanisms underlying C3 carbon and nitrogen metabolism under elevated CO2
Rising atmospheric CO2 concentration will affect species-specific responses to carbon (C) gain in plants, in turn impacting plant productivity in natural and agro-ecosystems in the future. Several interacting environmental and genetic factors affect species-specific response to C gain under …
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