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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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A novel correction for biases in forest eddy covariance carbon balance
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Environmental and biological controls on seasonal patterns of isoprene above a rain forest in central Amazonia
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Influences of nitrogen oxides and isoprene on ozone-temperature relationships in the Amazon rain forest
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Processing and sorting forest residues: Cost, productivity and managerial impacts
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Coupled dynamics of iron and iron-bound organic carbon in forest soils during anaerobic reduction
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Conversion of natural forests to managed forest plantations decreases tree resistance to prolonged droughts
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The Effect of Air Separations on Fast Pyrolysis Products for Forest Residue Feedstocks
This study investigates the intricate relationship between biomass preprocessing and pyrolysis product yields, employing the air classification technique for the treatment of loblolly pine residues with varying moisture content. A comprehensive exploration of the physicochemical properties of air-classified loblolly pine informs a sophisticated pyrolysis simulation model. Given the complex and multifaceted nature of biomass pyrolysis, operating across diverse temporal and spatial scales, a pyrolysis kinetics-based CFD–DEM simulation method is employed to predict product yields. Results showed that the elevated moisture content amplifies particle adhesiveness, necessitating augmented air velocities for effective separation, thereby influencing the efficiency of the separation process. While carbon and hydrogen contents exhibit relative stability across diverse moisture contents and blower frequencies, the oxygen content undergoes noticeable changes. For example, the oxygen contents were measured as 29.2 and 38.6 wt% in the light fraction of 30% moisture content sample at blower frequencies of 10 and 20 Hz, respectively. An intriguing finding emerges from pyrolysis simulation, indicating that a lower blower frequency in air classification moderately enhances bio-oil yield and significantly improves its quality, particularly in terms of water content. For instance, the water content in the bio-oil was about 1.5% and 10% in the heavy and light fractions, respectively from 10% moisture sample under 15 Hz blower frequency. In summary, a detailed understanding and strategic manipulation of critical material attributes in biomass through efficient fractionation techniques are imperative for advancing fast pyrolysis as a sustainable avenue for renewable energy and chemical production.
More than Drought: Precipitation Variance, Excessive Wetness, Pathogens and the Future of the Western Edge of the Eastern Deciduous Forest
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Increased streamflow in catchments affected by a forest disease epidemic
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Extent of localized tree mortality influences soil biogeochemical response in a beetle-infested coniferous forest
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Interactive effects of climate change and fungal communities on wood-derived carbon in forest soils
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