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 62 for “"Sphericity"”.
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The non-sphericity of Triton's atmosphere as evidenced by stellar occultations
… and understand recent measurements of the non-sphericity in Triton's atmosphere, the Tr148 occultation data set was reanalyzed. Recent new data from the Hubble Space Telescope Fine Guidance System allowed the separation and position angle of the Tr148 double star to be independently …
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Design of a container for the collection of solder balls produced by the Uniform Droplet Spray (UDS) process
… industry requires solder balls of higher sphericity. The present work investigates improvements made to the UDS process in order to increase the sphericity of the solder balls. The thesis begins by describing the motivation and importance of the current research. The theoretical analysis …
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Development and evaluation of oral solid dosage forms for colonic delivery of drugs for the treatment of cystinosis.
… including: pellet size analysis, qualitative sphericity determination, friability testing, bulk density measurements, and optical and scanning electron microscopy. Amongst the polymers tested, good pellets with relatively high sphericity (percentage sphericity: 65-70%) were produced through …
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FORMABILITY OF SHEET-METAL UNDER LATERAL PRESSURE
… of deformation, the bulge shape increases in sphericity. Beyond a certain point, the second or advanced mode of bulging sets in, and the bulge deviates increasingly from sphericity until fracture occurs. Throughout deformation, the bulge surface is never spherical, but exhibits a complex …
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Textual characteristics of coarse sediments in selected streams of the Niagara Peninsula, Ontario
… dolostones and sandstones. The average sphericity for carbonates and sandstones increases from 0.65 to 0.67, while maximum projection sphericity remains nearly constant with an average value of 0.52. Pebble roundness increases more rapidly than either of the sphericity parameters and the …
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LIDAR-BASED DELINEATION OF KARST FEATURES IN THE GYPSUM PLAIN, EDDY COUNTY, NEW MEXICO AND CULBERSON COUNTY, TEXAS
… analyses was used to infer origins; high sphericity suggests collapse origins and low sphericity suggests solutional incision origins. After GIS-based verification, spatial sinkhole analyses were refined to produce a spatial density map of surficial karst manifestations across the Gypsum …
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The topology of Baues complexes and flip graphs
… of a product of two simplices and the sphericity of extension spaces of realizable oriented matroids. This thesis covers the main construction which is common to these proofs, but defers the details specific to each problem to other papers.
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Modeling the sustained release of PLGA-based drug delivery systems with a physically-based model and pore space characterization
… were found and it was shown that the mean sphericity of the pore space network may be negatively correlated with the first-phase release, although the similar range in the variances of the mean sphericity warrants a more in-depth statistical study to determine the value and significance of …
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Influence of some particle characteristics on the small strain response of granular materials
… F(e). Normalised Gmax increases with increasing sphericity and roundness of the particle. At the same void ratio, the stress exponent, n, elastic threshold strain, e, and shear modulus degradation, G/Gmax, for granular materials decrease with an increase in sphericity and roundness. Material …
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Three Essays on Testing for Cross-Sectional Dependence and Specification in Large Panel Data Models
… Prof. Lee. The first essay considers testing for Sphericity with non-normality in a fixed effects panel data model. The second essay considers testing for cross-sectional dependence in heterogeneous large N and large T panel data models allowing error serial correlation. The third essay considers …
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A Radiative Analysis of Angular Signatures and Oblique Radiance Retrievals Over the Polar Regions From the Multi-Angle Imaging Spectroradiometer
… surface through differences in absorption and sphericity of particles that make up clouds and snow surfaces. The effects of sphericity and absorption suggest that low level clouds appear bright at oblique forward-scattered angles because of the presence of small, spherical droplets. (3) This …
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Using Herzberg´s Two Factor Theory of Motivation-Hygiene in Employee Satisfaction Surveys
… was good, KMO = .855 and Bartlett´s test of sphericity χ2 (190) = 1058,463 p < .001 indicated a good correlation for factor analysis. Using Kaiser´s criterion, the first PAF reported five factors instead of the two predicted by previous theory. Second, PAF with only two factors extracted did …
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Particle shape optimization in colloidal clusters for structural colour applications
… supraball clusters is associated with higher sphericity and shows no consistent shape signature differences between the cluster types’ building blocks. The largest discrepancies occur in the smallest cluster sizes, suggesting future work below this range. The use of spherical particles is …
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Models of high-temperature desulfurization using zinc-based sorbents
… 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 to the models include …
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Coating studies and video imaging of the flow patterns of tablets in a semi-circular fluidized bed
… motion (large placebo tablets, 8mm diameter and sphericity factor, &phis; ≠ 1) in the vicinity of the spray zone of a semi-circular Wurster bed coater. A novel method of computer based video imaging was used to measure the velocity and voidage profiles in the draft tube region of the …
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The impact of a residential substance abuse treatment for women
… computed using the Mauchly's Test of Sphericity. The results indicated a substantial decrease in psychological problems for women who remained in treatment for five months, which supports positive progress for women in treatment in the residential twelve-step program.</p>
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Resolution of grain scale interactions using the Discrete Element Method
… evidence showing that shape at multiple scales (sphericity, angularity, and friction) plays a role in granular material behavior. This thesis contributes a new non-spherical representation to model particles as ellipsoidal bodies. This is validated and benchmarked against current representations …
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Psychometric properties of the Icelandic version of the MacNew heart disease health-related quality of life questionnaire
… confirmed, KMO = .90 and the Bartlett´s test of sphericity, 2 (351) = 2113.32, p < .001. The test-retest reliability of the globalscore ( = .87, p < .001) and subscales = .83 - .87, p < .001) proved to be adequate. A paired sample t-test indicated that the MacNew was sensitive to change. The …
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Use of Aloe vera and Aloe marlothii materials as excipients in beads produced by extrusion–spheronization
… polyvinylpyrrolidone and aloe materials on the sphericity and release rate of ketoprofen. Scanning electron microscopy revealed more porous beads when aloe materials were included in the bead formulations compared to the formulation with MMC alone. The bead formulations containing aloe materials …
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Repeated Measures ANOVA with Latent Variables: A New Approach Based on Structural Equation Modeling
… This can be used to test assumptions such as sphericity (i.e., as an alternative test to Mauchly's test for sphericity), compound symmetry or auto-regressive effects. Although L-RM-ANOVA provides many advantages, it is not without its drawbacks for the user: L-RM-ANOVA uses maximum likelihood …
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