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 71 for “"Duff"”.
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Factors that influence ponderosa pine duff mound consumption
… desired effects. Prolonged combustion in duff accumulations at the base of large conifers can lead to fine root mortality, cambial injury, enhanced susceptibility to bark beetle attack, and possibly tree death. Pre-burn sampling to predict duff mound consumption from measurable attributes …
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Factors that influence ponderosa pine duff mound consumption
… desired effects. Prolonged combustion in duff accumulations at the base of large conifers can lead to fine root mortality, cambial injury, enhanced susceptibility to bark beetle attack, and possibly tree death. Pre-burn sampling to predict duff mound consumption from measurable attributes …
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Thomas Duff & Co and the Jute Industry in Calcutta, 1870-1921: Managing Agents and Firm Strategy
… of the Dundee-based managing agents, Thomas Duff & Co.The thesis argues that the industry experienced a pattern of extensive growth with static technology that led to rising costs and pressure on profits and dividends. Nevertheless, the pattern of entry into the industry indicates the …
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The Effects of Forest Fires on Runoff Rates: The Role of Duff Removal and Surface Sealing by Vegetative Ash, Western Montana
… often attributed to the removal of the surface duff and litter, the formation water repellent soils, and surface sealing. There has been considerable work on the influence of water repellency on post-fire runoff, however few studies have addressed the hydrologic importance of litter and duff …
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The Effects of Forest Fires on Runoff Rates: The Role of Duff Removal and Surface Sealing by Vegetative Ash, Western Montana
… often attributed to the removal of the surface duff and litter, the formation water repellent soils, and surface sealing. There has been considerable work on the influence of water repellency on post-fire runoff, however few studies have addressed the hydrologic importance of litter and duff …
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Wildland fuel loading estimates along a gradient of forest cover types and landscape factors in Harpers Ferry National Historic Park, West Virginia and Rock Creek Park, Virginia, USA
… downed woody material, litter (Oi Horizon), and duff (Oe+Oa Horizons) contribute to fuel loading and fire risk. They also play a critical role in overall ecosystem health. Downed woody material contributes to carbon storage and nutrient cycling, and provides an important source of habitat …
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Quantification of Influential Surface Fuel Parameters in Fire-Prone Ecosystems of the Netherlands
… models for three major fuel categories (litter/duff, shrub, and downed woody material). Reduction of the number of parameters to measure would streamline the process of fuel load estimation by reducing the number of measurements that need to be taken in the field. The results of this study show …
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Influence of Vegetation On The Distribution of Small Mammals On A Waterfowl Production Area
… Four vegetative parameters; height of duff, height of vegetation, percent duff cover and percent life cover were measured in each cover type. No differences were found between these measurements and the number of meadow voles captured. Although there are most than 57,000 acres of …
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Characterizing Cortex-Hippocampus Interactions During Language Processing
… discourse referents [Rubin et al., 2011] [Duff et al., 2011], reconstructing narratives [Race et al., 2011a], and display limited linguistic flexibility in engaging "verbal play" [Duff et al., 2009]. Here we leverage a large-scale fMRI dataset (n=790) and identify a region that responds to …
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Deadwood Dynamics: A Case Study at Prince William Forest Park, Virginia
… total DWM, fine woody material, litter, and duff mass. The Virginia pine (Pinus virginiana) forest cover type had the highest percent dead basal area and total DWM mass per hectare. Elevation, aspect, and soil order were not significantly related to percent dead basal area, total DWM, 1,000 …
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Root-zone soil temperature: sources of variation and some effects on planted conifer seedlings in high-elevation forest openings in the interior of British Columbia
… the combination of thickness of forest floor (duff), cumulative % vegetation cover, and % soil moisture (R2 = 0.73). Combinations including relative surface irradiance (PACL), cumulative % cover-weighted vegetation height, micro-slope and micro-aspect were less important. While the influence of …
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Post-processed shadow determination for composition of depth images
… by different methods. In 1984, Porter and Duff first introduced a well defined approach to computer image composition, and in 1985, Duff proposed an extension to the this method that employed depth images. Using depth images, visibility determination can be done by the computer, reducing …
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Overstory structure and detrital dynamics of ponderosa pine forests: insights into fire behavior and its carbon consequences
… dynamics of detrital pools (dead wood, litter, duff). Woody detritus accumulated quickly after a fire, as dead material fell. This peak then decomposed before pool size increased again as new material fell. Litter accumulated monotonically, and was most strongly related to canopy cover. Duff was …
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Cognitive neuroscience methodologies provide insight into medial temporal lobe contributions to perception, language, and creativity
… linguistic common ground (Rubin, Brown-Schmidt, Duff, Tranel, & Cohen, 2011). Eye-movements of participants with hippocampal amnesia were monitored during real-time language comprehension. In Chapter 5, we investigated whether hippocampus and its role in flexibly expressing information contribute …
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The Effects of the Non-Climatic Inhomogeneities in Surface Weather Station Records on Long Term Trends in Canadian Fire Weather Index System Codes.
… data instead of the raw inhomogeneous records. Duff Moisture Code (DMC) is the most resistant to weather record inhomogeneities, followed by the Drought Code (DC). Monthly Drought Code (MDC) is recommended as an optimal fire weather proxy for long term analysis, as monthly data homogenization …
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Advertising distractor devaluation under perceptual and cognitive load
… & Raymond, 2006) and advertising research (Duff & Faber, 2011). Recent advertising research demonstrates that when ads are embedded beside a central task, people tend to ignore them when focusing on the task. We examined how people's evaluation, familiarity and memory of an ad differ when …
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Building a better burn: Fuel characterization and fire effects in silvicultural systems in the southern United States
… indirect and destructive loadings of litter, duff, and fine woody material (1-hour and 10-hour fuels) for six sequential prescribed burns on the Bankhead National Forest in northcentral Alabama, US. We found that indirect sampling underestimated loading of 1-hour fuels, litter, and duff, but …
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Effects of Wildfire Intensity on Invasives, Stand Structure and Fuel Loading in Shenandoah National Park
… of fuel and to determine the bulk density of the duff and litter layers. High intensity wildfires initially reduced species diversity and evenness in the tree and herbaceous strata, but after 14 years tree species diversity and evenness returned to levels found in unburned areas, while herbaceous …
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Überweiss: Moving fictional brands into the real world
… handful of well-known examples exist such as the Duff drinks from The Simpsons and Bubba Gump Shrimp from Forrest Gump. Attention was only drawn to this matter around a decade ago, so much still remains unknown in the field of fictional branding. Alexander Reading and Rebecca Jenkins studied the …
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Influence of Woody Vegetation Composition and Structure on Fuels and Prescribed Fire in Mountain Longleaf Restoration
… bed bulk density significantly reduced RoS and duff consumption. Precise mechanisms remain unresolved, but increased mesophyte importance directly and indirectly reduced fire intensity, in part by reducing available fuel load, and should be targeted for removal in restoration efforts. In …
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