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 54 for “"Bimodal distribution"”.
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On a Bimodal Distribution of Grain Size in Mechanically Alloyed Bulk Tungsten Heavy Alloys
… alloys with 2, 4 and 6 wt.% Ni. Evidence of a bimodal grain size distribution was seen in X-ray diffractograms of sintered samples and confirmed by scanning electron microscopy. Grain sizes in the small-grained regions ranged from 200–600 nm; those in the large-grained regions ranged from 1–2 …
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The impact of bimodal distribution in ocean transportation transit time on logistics costs : an empirical & theoretical analysis
… levels. This thesis examines the effects of bimodality in transit time distributions -in particular, the cost of ignoring bimodality. One method common in practice is to completely ignore variability. On the other hand, a popular theoretical method to account for transit time variability is …
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Transport of solutes in complex hydrogeological media
… conductivity field generated based on a bimodal distribution. The effect of bimodal distribution on plume migration is examined and the correlation structures of the concentration field is analyzed; The numerical results indicate that the plume separates into small blocks and travels at …
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Studying the environmental dependence of star formation properties of galaxies in the Abell 1437 galaxy cluster and its surrounding large scale structure
… of galaxies. Recent studies show a strong bimodal distribution of galaxy properties, with red, passive galaxies dominating the bimodal distribution in dense environments, compared to blue, actively star forming galaxies dominating the bimodal distribution in low density environments. Blue, …
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The Surface Reaction Mechanisms of Beta-Diketones on Transition Metal Surfaces Including Applications to Metal Thermal Chemical Vapor Etching and Heterogeneous Catalyst Particle Redispersion
… and acetylacetone at ∼560 K for 8 hours. A bimodal distribution of CO desorption states was achieved, at 405 K and 585 K, with more CO desorbing from the high-temperature state. This indicated a decrease in Pd particle size relative to the sintered and, to some extent, untreated catalyst …
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A comprehensive literature study on the effect of cannabis use on cognition and aggressiveness, including a small study to explore these variables
… characterized the sample group. a) Age: Bimodal distribution with peaks at 21-25 years and 31-35 years. Five patients were older than 35 years. b) Marital Status: In the sample. 59.2% were single. 11.1 % married and 29.6% the marital status was unknown. c) Number of Children: In the …
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Methods to Improve Marker Assisted Selection (Mas) for the Sugary Enhancer1 (Se1) Trait in Maize
… for all sugars measured. Data showed a bimodal distribution among sucrose and fructose measurements for the se1se1 genotype each year. SSR and RAPD markers from regions previously associated with kernel sugars did not identify a linked marker for se1.
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Modeling Distributions of Test Scores with Mixtures of Beta Distributions
Test score distributions are used to make important instructional decisions about students. The test scores usually do not follow a normal distribution. In some cases, the scores appear to follow a bimodal distribution that can be modeled with a mixture of beta distributions. This bimodality may be …
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Utilization of therapeutic touch in clients diagnosed with chronic pain
… It was noted that the data were skewed and had a bimodal distribution. Therefore, the nonparametric tests of Wilcoxon Ranks Test and the Chi Square 2 x 2 Test of Independence were done. The hypothesis, that patients diagnosed with FM and RA would demonstrate significant decreases in pain (p …
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Models of high-temperature desulfurization using zinc-based sorbents
… imaging analysis software, the grain size distribution and grain sphericity can be obtained.;The basic forms of the SCM (Shrinking Core Model) and GPM models could not predict correctly the observed conversion-time data for pure zinc oxide sulfidation reaction in this study. Modifications …
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Physical Properties of Magnetic Macromolecule-Metal and Macromolecule-Metal Oxide Nanoparticle Complexes
… heat treatment. The mean particle size and size distribution increased for the graphite coated cobalt particles, due to particle sintering at 700oC. In the silica coated cobalt nanoparticle system, the mean particle size increased when the sample was heat-treated at 600oC leading to a bimodal …
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Petrogenesis of the Moosehorn igneous complex, Maine
… the Coastal Maine Magmatic Province suggest a bimodal distribution of igneous rocks in both space and time. The earlier magmatic event is represented by the development of large igneous complexes which occur along a magmatic axis extending from Calais to Penobscot Bay, Maine. These complexes …
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Stochastic histories of dust grains in the interstellar medium
… phase can under certain circumstances cause a bimodal distribution in grain size.
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Clustering in Multidimensional Spaces with Applications to Statistics Analysis of Earthquake Clustering
… and Paczuski's metric is found to follow Weibull distribution. Clustering is defined as deviation from this independence model. An existing declustering program that separates dependent and independent earthquakes into fore- and aftershock clusters is examined. This declustering program is …
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Factors affecting the population dynamics of the green peach aphid, Myzus persicae (Sulzer), on flue-cured tobacco in Virginia
… pattern of temporal development of GPA was a bimodal distribution with the greater proportion of individuals occurring after topping of the crop. Cumulative proportional population growth models using degree-days were able to adequately describe growth of populations only on individual farms. …
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Petrology of Mineralized and Non-Mineralized Samples from the Railroad District within the Carlin Trend, Elko, NV
… 2-8 wt. % in the faultbreccias. An apparent bimodal distribution of Au was found which reflects the mediadensity that contains it (Fe-rich pyrite vs. quartz).Elemental (Si, S, Te, Ca, Fe, As, Au, Ag, Ba, Al, K, Na, and Ti) data gatheredwas used for mean weight percents and correlation …
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Orientations and magnitudes of paleostress in the Great Valley Province of northern Virginia
… cements were measured are characterized by a bimodal distribution of compression axes—the first point maximum being oriented sub-perpendicular to bedding, the second maximum placing compression directions at low to moderate angles to bedding. Restoration of bedding to horizontal results in …
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Automated detection of dune crest-lines in planetary satellite images
… to solve the problem caused by the inherent bimodal distribution of the histogram of the gradients by computing the overall dominant orientation of the dune field gradients. The concept of the gradient direction map is also introduced as a method to segment areas of the image which agree with …
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Variances of some truncated distributions for various points of truncation
… study is to examine variances in the case of distributions obtained by truncating a given distribution at various points. In particular, the truncated distributions are restricted to nested increasing intervals, and the question is posed whether the variances of these distributions are …
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Composite materials made of chitosan and nanosized apatite : preparation and physicochemical characterization
… in the nanosize range (15-50 nm) and occurs in a bimodal distribution with respect to its crystallite length. Two types of distribution domains of hydroxyapatite crystallites in the composite matrix such as cluster-like (200-400 nm) and scattered-like domains were identified by the transmission …
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