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 22 for “"angle of repose"”.
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Investigating the angle or response and maximum stability of a cohesive granular pile
… I investigate the static and dynamic properties of a granular heap made cohesive by an interstitial fluid. I present the results of experimental work measuring the maximum angle of stability and the angle of repose of such a pile in a rotating drum geometry. I discuss existing models for the …
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Shared memory parallelization for large scale 3D polyhedral particle simulations
… and anisotropic. While they are known as one of the most widely used materials in industry, their complex behaviors remain not fully understood. Particle-based numerical methods were introduced to account for complex particle interactions yet are computationally demanding. Significant …
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Simulation of urea particle flow using DEM for dry fertilizer spreading optimization
Uniformity of dry fertilizer spread pattern relies on the accurate representation of bulk material behavior during handling, discharge, and impact. This study aims to develop a discrete element method (DEM) model for urea and assessed it through a calibration and multi-method validation framework …
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The effects of groundwater seepage on stream regimen : a laboratory study
<p> The effects of' groundwater seepage on the competence, bed rough ness, and water surface slope of small streams were studied in two laboratory fumes. The larger fume is 20 feet long, 3t feet wide, and 18 inches deep; the smaller flume is 12 feet long, 6 inches wide, and 10 inches deep. Both …
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Pharmaceutical powders in experiment and simulation : towards a fundamental understanding
… was used to simulate the relative importance of cohesion and friction. For angle of repose simulations, increasing the cohesion increased the final angle in a consistent, linear fashion. Increasing the interparticle friction coefficient increased the final angle up to a critical friction …
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Dense granular flow in rotating drums: a computational investigation of constitutive equations
The constitutive laws of dense granular flow are investigated. Simulations of a drum, with periodic boundary conditions, rotating at varying speeds are performed. From the resulting data, kinematic and kinetic fields are extracted and used to investigate the validity of constitutive relations …
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Neotectonic deformation features in plio-pleistocene coastal aeolianites: palaeoseismology and earthquake hazard implications for the Southern Cape, South Africa
… been studied to resolve the neotectonic history of the region, estimate the recent to current upper-crustal stress field, and infer seismic hazard. Previous studies indicate possible Quaternary faulting within the Southern Cape, major faults within the underlying geology, and a horizontal maximum …
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Microscale Investigation of the Influence of Interparticle Cohesion on the Macro-Behaviour of Soil
… cohesive interactions between soil particles are often neglected and simplified. This thesis aims to address this critical gap by considering the cohesive behaviour in DEM and CFD-DEM simulations and investigating the influence of interparticle cohesion on fundamental soil behaviour such as the …
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Effect of dry particle coating on the properties of cohesive pharmaceutical powders
… can be applied and are very useful for a number of industrial applications, in this case the pharmaceutical industry. This work investigates the effect of dry particle coating to improve the flowability of cohesive active pharmaceutical ingredient (API) powders and their blends. Improving the …
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A precision blade mechanism for powder recoating in Selective Laser Melting
… Melting (SLM) is an industrially viable means of additively manufacturing metal components with complex geometries from a wide variety of alloys. In this process, a metal powder is spread onto a build surface in a thin layer, and then the powder is selectively melted to form a cross-sectional …
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Frictitious Matters
… and specifiable. We live in the modern fantasy of “ frictionlessness,” where material becomes product and smoothness lubricates the flow of capital. Today architects don’t craft, but rather we specify. Granite, unlike processed ‘plastic’ materials, resists the abstraction of typical …
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The Most Beautiful Place on Earth: Wallace Stegner in California, 1945-1993
<p>This dissertation explores the life and work of the writer Wallace Stegner (1909-1993) and his intellectual efforts to create, clarify, and defend the contours of a “geography of hope” in the American West. Chapter 1 begins with Stegner’s move to California in 1945. In the context of his …
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Development of paediatric dosage forms of furosemide using the problem structuring method of morphological analysis
The lack of age-appropriate (paediatric) authorised medicines is a long-standing problem amongst regulatory authorities, patients, parents and prescribers. This is driven by the paucity of information on clinical efficacy, deficiency in safety data (i.e. biopharmaceutics) and the lack of quality …
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Active earth pressure from c-Ø soil subjected to surcharge and seismic loadings
Construction of retaining structures to support soils at slopes steeper than their angle of repose has been a routine practice in most civil engineering projects. The successful design of such structures depends greatly on the calculation of total active force from the soil backfills, which has …
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Electrical Resistivity Imaging of Preferenital Flow through Surface Coal Mine Valley Fills with Comparison to Other Land Forms
… in the mining-influenced headwater streams of this biodiverse ecoregion. Among pollutants of concern is total dissolved solids (TDS) which is usually measured via its surrogate parameter, specific conductance (SC). The SC of valley fill effluent is a function of fill construction methods, …
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Erosion and sedimentation in Lake Ashtabula, southeastern North Dakota
<p> Erosion along the shore of Lake Ashtabula and nearshore and offshore sedimentation were studied from May 1969 to December 1970. The lake, located in the southeastern part of North Dakota, was formed when the Baldhill Dam stopped the flow of the Sheyenne River in 1950. Maximum depth of the lake …
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Experimental and numerical study of flow characteristics and segregation in flow enhanced systems
In the study of granular materials, two major topics of importance are powder flow enhancement mechanisms and the flow characterization. This dissertation is involved with both of these topics. With respect to the powder flow enhancement, this study involves investigation of two types of flow …
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Efavirenz pre-formulation study : selection of a cyclodextrin inclusion complex or co-crystal complex for tabletting
… used as an anti-retroviral for the treatment of human immunodeficiency virus (HIV) type I. It is classified as a class IΙ drug under the Biopharmaceutical Classification System (BCS) and exhibits a low solubility (aqueous solubility of 9.0 μg/ml) and high permeability (variable oral …
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Nanotechnology in pulmonary drug delivery: Compressible proliposome formulations for nebulization
… are promising carriers for the encapsulation of drug molecules and subsequent delivery to the respiratory tract. The advantages of liposomes as carriers have been widely reported in literature, there are however associated disadvantages such as stability issues when suspended in aqueous media. …
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Extrusion processing of selected fish feed blends containing distillers dried grains with solubles (DDGS)
… seafood products have made aquaculture to one of the fastest growing sectors in the food industry, but have increasingly depleted wild fish stocks through capture fisheries. Commonly, fish meal has been used as the primary source to supply fish with essential proteins, but it is expensive. Feed …
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