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 “"multiphase systems"”.
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Poly(2-alkyl-2-oxazoline) containing multiphase systems
This research is focused on the polymerization of 2-alkyl-2-oxazoline homopolymers and 2-alkyl-2-oxazoline containing copolymers with well-defined structures. In addition, the potential of selected materials as polymer blend compatibilizers was briefly evaluated. The polymerization of …
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Synthetic Design of Multiphase Systems for Advanced Polymeric Materials
Multiphase systems provide an opportunity to develop both novel processing methods and create advanced materials through combining the properties of dissimilar phases in a synergistic manner. In this work, we detail the halogenation of poly(ether ether ketone) (PEEK) through both solution-state and …
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Automatic Generation of Chemical Kinetic Models including Macromolecules in Multiphase Systems
… of industrial and environmental chemistry systems. Many important industrial and environmental chemistries involve thousands of species and hundreds of thousands of complex pathways, which are difficult to resolve manually. To address this challenge, automatic mechanism generation software …
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Applications of Data-Driven Learning Models in Fluid Mechanics: Solid-Fluid Multiphase Systems and Bat Flight
… industrial, environmental, and biological systems, encompassing particle-laden flows in chemical processing, urban airflow, and biological locomotion. Understanding and studying these interactions is essential for optimizing engineering designs and advancing scientific knowledge. This …
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Control and design of multi-use induction machines : traction, generation, and power conversion
… takes advantage of topological symmetries in multiphase systems to overcome this challenge. This method is applied, but not relegated to induction machines.
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ADVANCING MULTIPHASE PROCESS DEVELOPMENT WITH HYBRID PHYSICS-BASED – MACHINE LEARNING MODELS
Multiphase reaction systems are widely used in the chemical industry for the synthesis of pharmaceuticals, fine chemicals, and bulk intermediates. However, scaling up such systems is challenging due to the coupled effects of mass transfer and intrinsic reaction kinetics, both of which can control …
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The Ballistic Response of Particle-Filled Elastomeric Systems
… to variations in the microstructure. The multiphase systems under investigation consist of micron-sized ceramic powders integrated within a siloxane elastomer to create flexible particulate composites. In particular, the role of the particulate phase is assessed by varying the fifiller …
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A numerical framework for the direct simulation of solid-fluid systems
… of a high-fidelity modeling capability for these multiphase systems. Continuum modeling approaches overlook the microscale solid-fluid interactions from which macroscopic system properties emerge, while experimental inquiries have been plagued by high costs and limited resolution. One promising …
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Computational Simulation of Coal Gasification in Fluidized Bed Reactors
… Those fluidization models were then applied to systems at elevated temperatures and polydisperse systems that featured a complex material injection geometry, for which no experimental data exists. A method for establishing similitude between 2-D and 3-D multiphase systems that feature …
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Large Scale Simulations of Bidisperse Emulsions and Foams
… processes. The macroscopic properties of these multiphase systems are determined by the viscous and interfacial interactions on the microscopic level. In previous research efforts, the realism of computer simulations has been limited by the cost of the computational algorithms which scale as …
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Computational multiscale analysis and optimization of multiphase hierarchical structures within a continuum micromechanics framework
Hierarchical multiphase systems such as plant structures apply the concept of microheterogeneity repetitively across a hierarchy of well-separated length scales: composite microstructures at a smaller scale form the base materials for new microstructures at the next larger scale. Their complex …
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Accurate fault location for power transmission lines
… is solved for the distance to fault. For multiphase systems the idea is 'generalised by using the theory of natural modes which involves the evaluation of eigenvalues and eigenvectors of the lines. In this way a multiphase system is decoupled into a number of single-phase modal circuits; …
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Multiphase flow in porous media: the impact of capillarity and wettability from field-scale to pore-scale
Multiphase flow in the context of this Thesis refers to the simultaneous flow of immiscible fluids. It differs significantly from single-phase flow due to the existence of fluid-fluid interfaces, which are subject to capillary forces. Multiphase flow in porous media is important in many natural and …
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Understanding Structure-Property Relationships for Impact Polystyrene
… as in situ tools to monitor polymerizing systems and thereby follow morphology development. Ex situ rheological methods were then employed on post-phase inversion samples to extract interfacial tension using well-established quantitative rheological models. Polymerizations were conducted …
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Experimental and modelling studies on the phase behaviour of mutual solvents and their transport through porous media in oil/brine/mutual solvent systems in the context of scale inhibitor squeeze treatments
… is investigated in oil/brine/mutual solvent systems. Effects of salinity and chemistry are determined at field relevant conditions. The influence of scale inhibitors on phase behaviour is also investigated and mutual solvent blend design is examined. The work also develops a quantitative …
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Microreactor technology : scale-up of multiphase continuous flow chemistries
… of very expensive and complex control systems to ensure identical operating conditions in each unit for a perfect and predictable overall reactor performance. On the other hand, scale-up by increase in channel size risks losing mass and heat transfer performance. The Advanced-Flow …
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High performance polymeric networks and thermoplastic blends: microwave versus thermal processing
… which will allow the processing of polymeric systems, both as reactive thermosetting systems and as nonreactive thermoplastics. Fundamental studies relating epoxy network generation to processing conditions have been investigated in a tunable, single-mode microwave cavity at a frequency of …
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Engineering properties of multiphase block copolymers
… ≃16,000) could be obtained as either single or multiphase systems depending upon their previous thermal history. Homogeneous films, with a single intermediate Tg, were obtained via solution casting, whereas compression molding provided films exhibiting two Tg's. Subsequent DSC studies pointed …
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Development of 18F radiochemistry for positron emission particle tracking (PEPT)
… used to obtain dynamic information about multiphase systems. The basis of the technique is to radiolabel a phase-representative tracer particle with a positron emitting radionuclide. Electron-positron annihilation produces pairs of back-to-back 511 keV gamma photons emitted from the …
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Integrated on-board battery chargers for EVs based on multiphase machines and power electronics
… chargers for electric vehicles (EVs) based on multiphase machines and multiphase power electronics. At present, EVs rely on three-phase systems for machine propulsion. However, recent advances in multiphase drive technology have firmly established their potential advantages over their …
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