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 23 for “"Reactive materials"”.
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Small scaled reactive materials combustion test facility
Combustion of reactive materials forms an active area of research for reactive fragment and structural materials applications. Currently, reactive fragment tests involve high velocity (1-2 km/s), large caliber projectiles directed into blast chambers where overpressure is measured to quantify …
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Explosive initiation of tungsten based reactive materials in air
… of evaluating the enhanced blast effect of reactive materials (RM’s) initiated by a high explosive detonation. High speed pressure, shadowgraph imaging, pyrometry and spectroscopy diagnostics were developed and used concurrently for tests conducted in these facilities. Well known thermite, …
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Tools for modeling reactive materials: detonation initiation and chemical kinetics
In this thesis I will explore a variety of topics. First will be a comparison between simulations and experiments using a program called ALE3D. In these simulations, a material will be detonated and the pressure from the expanding shock wave will be measured at several locations for a comparison to …
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Explosive initiation of various forms of the Ti/2B energetic system
… over the weapon’s blast effects. Metal-based reactive materials (RM) are of interest because they will allow weapons to be tailored to suit certain applications. The combination of titanium and boron is a prime example of such a reactive material. The high temperatures and persistent fireball …
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Theory and modeling of laser-driven flyer plate experiments to study explosives under a microscope
Studying liquid and solid high-explosive materials requires precise characterization of thermodynamics and chemical kinetics to capture the reactive behavior. Although high explosives have been studied for many decades, there is currently no reactive continuum scale model for characterizing …
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Combustion signatures of various energetic metal powders in a shock tube experiment
… for explosive material applications, such as reactive materials, reactive fragments, and metalized explosions. It is important to understand the burning characteristics of these materials in order to optimize their use. This study focuses on comparing the spectroscopic outputs of several …
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Ignition of metal powder by electrostatic discharge stimulation
… metal powders with nanocomposite metal-based materials is being considered. Such nanocomposite reactive materials are capable of very high reaction rates while maintaining the high combustion enthalpies characteristic of metals. However, such novel reactive nano-materials are often highly …
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The effects of case mass to charge mass ratio on aluminum-based structural energetic materials
… accelerate them to high speeds. Alternative case materials are being investigated to have a cased explosive that has similar or greater fragmentation damage while also contributing to the energy of the initial blast. Tests were conducted on three different aluminum based reactive materials and a …
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Engineering scalable device architectures for lead sulfide quantum dot solar cells
… of these production costs are due to expensive materials used in the quantum dot solar cell device stack, namely gold electrodes. While gold cannot be used on a commercial scale, there are less expensive but more chemically reactive materials that can be used. Replacing gold with aluminum or …
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Aspects of marine fouling in western Cape waters
… of macrofouling communities on six test materials was examined at 10m and 20m depths in Simonsbay for periods ranging from one month to one year. Community development was similar on inert non-reactive materials, aluminium, stainless steel, fibre glass and polyvinylchloride, but was …
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Modeling ignition and extinction in condensed phase combustion
… in developing the latest generation of energetic materials. An experimental “striker confinement” shock compression experiment was developed in the Prof. Glumac’s research group at the University of Illinois to study ignition and reaction in composite reactive materials. These include thermitic …
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A unified multi-physics formulation for combustion modelling
… explosives arising from the co-existence of a reactive carrier mixture of miscible materials, and several material interfaces due to the presence of immiscible impurities such as particles or cavities. The dynamic and thermodynamic evolution of the explosive is communicated to one or more inert …
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Factors that Affect the Immunogenicity of Lipid-PLGA Nanoparticle-Based Nanovaccines against Nicotine Addiction
… Fourthly, the nanovaccines carrying cross reactive materials 197 (CRM197) or tetanus toxoid (TT) showed a better immunological efficacy than the nanovaccines using keyhole limpet hemocyanin (KLH) or KLH subunit as carrier proteins. Finally, the co-delivery of monophosphoryl lipid A (MPLA) …
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Advancements in concrete material sustainability : supplementary cementitious material development and pollutant interaction
… clay and fly ash supplementary cementitious materials (SCMs) used in cement based materials were examined for their chemical and mechanical performance, as well as their pollutant interaction. This dissertation addresses three primary research questions, namely: (i) can zincite additions …
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Combustion of fine magnesium particles
Recent interest in developing Al-Mg alloys as reactive materials prompted studies of combustion mechanisms for particles of such alloys with different Al/Mg ratios. Reference experiments with pure Al and Mg powders are also desired to better understand and model combustion of the respective alloys. …
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Multifunctional reactive nanocomposite materials
Many multifunctional nanocomposite materials have been developed for use in propellants, explosives, pyrotechnics, and reactive structures. These materials exhibit high reaction rates due to their developed reaction interfacial area. Two applications addressed in this work include nanocomposite …
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Ignition mechanism in nanocomposites thermites
… ignition mechanisms of nanocomposite reactive materials. Although significant progress has been made, ignition mechanisms remain elusive. At the same time, a robust ignition model is required to incorporate these materials in practical energetic formulations. A challenge of this effort …
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Reactive solids under shock compression
In this dissertation chemically reactive solids, such as thermites and energy absorbing molecular materials, under shock compression are explored. To drive shock waves into target materials, an apparatus to launch and monitor laser-driven flyer-plates was developed. This was coupled to a home built …
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Biostability In Drinking Water Distribution Systems Study At Pilot-scale
… in their distribution systems. Use of less reactive (i.e. with less chlorine demand) pipes is recommended in order to prevent residual depletion and subsequent bacterial proliferation.This study is investigated biofilm growth simultaneously with suspended growth under a wide range of water …
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Differential Autophagic Responses to Nano-Sized Materials
… increase in the number of engineered nanomaterials currently being produced and introduced in the marketplace, raising concerns regarding the risk of human exposure to these specially designed, highly reactive materials. Engineered nanomaterials exert a diverse range of effects on …
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