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 42 for “"Clumping"”.
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Aggression, monopolization and growth depensation within groups of Japanese medaka (Oryzias latipes) : interactions between the temporal and spatial clumping of food
… and monopolization increase as the spatial clumping, spatial predictability, and temporal predictability of resources increase and as temporal clumping of resources decrease. Previous tests of resource defence theory have manipulated only one aspect of resource distribution at a time. I …
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Sizing and characterization of carbon fibers with aqueous water-dispersible polymeric interphases
… surface tensions of the aqueous solutions, fiber clumping and heterogeneous sizing deposition were major bottlenecks. Our novel process utilizes high tensions, high spreading, and low line speeds to accomplish the sizing step. Each processing independent variable can be continuously monitored and …
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Characterizing vegetation structure using waveform LiDAR
… present a method for describing physical canopy clumping structure for individual trees that provides detailed spatial clumping variations. We utilize the K-means clustering algorithm to extract structure from the large amount of canopy architecture information provided by full-waveform LiDAR. …
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Variations in bacterial adenosine triphosphate values due to genus and environmental conditions
… studies showed that L. brevis cells were clumping, especially in aged cultures. After sonication, ATP/cell remained relatively constant from lag through stationary phase. L. jensenii showed no signs of clumping and ATP/cell increased as the culture aged. Sonication had a lethal effect on …
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Inoculum pattern and relationship between incidence of black root rot of tobacco and inoculum density of Thielaviopsis basicola in field soil
… thoroughly mixed before use to preclude inoculum clumping. The results obtained with either systematic or random sampling indicated that propagules of T. basicola are clumped or aggregated in tobacco field soil, as there was a good fit of the data to the negative binomial distribution. Also, the …
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A phenological study of coalescence in two South African Gigartinales, Gigartina polycarpa (Kützing) Setchell et Gardner and Sarcothalia stiriata (Turner) Leister
… based. This study examines the phenology of clumping characteristics in Gigartina polycarpa and Sarcothalia stiriata in the field. Clumps of these two species appear to have a coalesced holdfast from which a number of uprights arise. Clumps of both species display characteristics previously …
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Imaging the invisible : constraining dark matter distributions in galaxy clusters using strong gravitational lensing
… matter distribution. The maximum allowed mass-clumping is found to be on the order [approx.] 10⁸ M ... over volumes of order [approx.] 10kpc x 10kpc x 10kpc, indicative of a mostly smooth dark matter distribution with only relatively small deviations, much smaller than those of the distribution …
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Comparison of Two Separation Methods for Biological Particles: Field-Flow Fractionation (FFF) and Sucrose Density Gradients
… the problems of similar size microorganisms clumping together during standard filtration methods. FFF separates particles based on size and density via the parabolic velocity profile of laminar flow in a ribbon-like channel. The sucrose method separates particles via centrifugation in a …
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Surface water flow resistance due to emergent wetland vegetation
… of this study were to investigate the effect of clumping vegetation on flow resistance and to develop a prediction equation for use in wetland design. A 6-m by 1-m by 0.4-m recirculating flume was planted with mature common rush, Juncus effusus, a common emergent wetland plant. Three different …
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Experiments and Design Considerations toward a Novel Continuous Flow Aluminum Fuel Reactor for Underwater Vehicles
… silica were needed to produce a homogenous non-clumping aluminum slurry. Lastly, pumping experiments, unfortunately, showed that in its current state, the fuel cannot be reliably pumped due to the settling of the aluminum inside the piping. Solutions are discussed to overcome the issues seen …
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Surface proteins of Finegoldia magna interacting with the human host
… is self-associating and contributes to bacterial clumping. FAF also mediates adhesion of the bacterium to basement membranes of human skin by interacting with BM-40. A further function of FAF is blocking of the activity of antimicrobial peptides. The genes encoding faf and sufA are present in a …
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The mechanism(s) of post-transcriptional regulation of the human constitutive endothelial nitric oxide synthase gene by tumor necrosis factor-alpha
… prevent the blood platelets and leukocytes from clumping and adhering to the vessel wall. Since eNOS plays a vital role in cell biology, it needs to be tightly regulated. It is expressed constitutively in normal physiological conditions, but may be deregulated in pathophysiological conditions. …
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Developmental morphology of <i>Calothrix Parietina</i> (Nägeli) Thuret [= <i>Gloeotrichia echinulata</i> (J.E. Smith) Richter]
… attributed chiefly to hormogonial production and clumping followed by differentiation. Increase of colony number to bloom concentration is achieved by hormogonial production, and also splitting or budding of the larger colonies into smaller colonies.</p>
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Effects of Starch-based Anti-caking Agents on the Functional Properties of Shredded Mozzarella Cheese
… the production of shredded cheese for reducing clumping and increasing the appearance of separate cheese shreds. Six anti-caking agents were applied to low moisture part skim Mozzarella cheese and examined for effects on three major functional properties of Mozzarella cheese; meltability, …
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Clustered wireless sensor networks
… results in the phenomenon of clustering or clumping of nodes. The first part of this dissertation analyzes a range of topologies of clustered WSNs and their impact on the primary sensing objectives of coverage and connectivity. By exploiting the inherent advantages of clustered topologies of …
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Linking Spatial Patterns of Seed Dispersal and Plant Recruitment in a Neotropical Tree, Virola Calophylla (Myristicaceae)
… seed-fall was greatest and showed significant clumping. Therefore, the initial pattern of seed deposition was largely maintained through regeneration to the sapling stage and was consistent with adult dispersion. Clumped recruitment patterns arose even in the presence of strong distance- and …
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Great Blue Heron Nesting Biology and Habitat Use On the James River in South Dakota
… of study. A significant amount of departure clumping in the same flight directions occurred, although data collected during the study did not allow the conclusion that the herons were following each other to feeding sites.
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African trypanosomiasis : its effect on platelet morphology, function and survival
… immune or toxic, leads to in vivo platelet clumping, marked platelet ultrastructural changes and functional inhibition of the circulating platelets. The potential ischaemic action of the resultant microthrombi and the haemostatic problems of poorly functioning platelets may contribute …
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Nanoscale Morphology and Electrical Behaviour of a Pressure Sensitive Ink
… that the addition of hyper-dispersant, an anti – clumping chemical agent, aided better dispersion of filler particles and increased the touch sensitivity of low filler particle fraction inks.
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Modelling the Epoch of Reionization with Cosmological Radiative Transfer Simulations
… galaxy escape fractions. I also examine the clumping factor required to recover the reionization history. The thesis concludes by consolidating findings from these sections, highlighting their implications for reionization and its observational signatures.
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