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 39 for “"In-situ Experiments"”.
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Parameter estimation for unsaturated flow models
The estimation of parameters in models for soil unsaturated hydraulic properties from transient flow experiments via inversion of the governing initial-boundary value problem is examined. Emphasis is on the estimation of parameters from in-situ experiments where available data are in the form of …
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Microstructural Heterogeneity and the Mechanical Behavior of Nanocrystalline Metals
In this study, we have demonstrated through experiments on nanoscale metal films how the interplay between microstructural heterogeneity and size in ultrafine grained and nanocrystalline metals leads to unusual mechanical behavior. In the first part of the study, we have shown that (a) …
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3D Printing of Specialty Devices for Geochemical Investigations: Real-Time Studies of Goethite and Schwertmannite Formation
… low-cost and easy to produce are needed to investigate low-temperature geochemical processes. We recently showed that desktop 3D printing stereolithography (SLA) can be used to efficiently fabricate a mixed flow reactor (MFR) with high dimensional accuracy comparable to traditional machining …
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Fundamental Behavior of Nanoporous Networks in the Out-of-Autoclave Manufacturing of Carbon Fiber Reinforced Polymer Composites
Throughout the aerospace industry, carbon fiber reinforced polymer (CFRP) laminated composites are used extensively in spacecraft and aircraft vehicles due to their high specific strength and stiffness and other properties. Processing these advanced structural CFRP composites, especially in prepreg …
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Studying the interface between DNA and inorganic nanoparticles to control shape and anisotropicity
… electrical and chemical properties are promising candidates for various applications ranging from catalysis to biomedicine. To realize the full potential of nanomaterials, it is important to demonstrate fine control over nanoparticle morphology, and precise spatial control of the position and …
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Transmission electron microscopy investigation of ion implantation damage in gallium arsenide and other semiconductors
The crystalline-to-amorphous transition induced by ion implantation was investigated in GaAs and GaP using transmission electron microscopy. The experiments included those performed in situ using the HVEM-Tandem Accelerator Facility at Argonne National Laboratory and also those performed using …
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Nanomechnics of crystalline materials : experiments and computations
In this thesis, experimental, computational and analytical approaches are employed to examine systematically the mechanisms of deformation in crystalline materials. Such insight can be used to exploit and avoid contact in actuator and sensor applications, to derive mechanical properties for …
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Sediment Oxygen Demand Kinetics
Hypolimnetic oxygen diffusers increase sediment oxygen demand (SOD) and, if not accounted for in design, can further exacerbate anoxic conditions. A study using extracted sediment cores, that included both field and laboratory experiments, was performed to investigate SOD kinetics in Carvin's Cove …
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Dynamic environmental transmission electron microscopy
… microscope (DETEM) at the University of Illinois Urbana Champaign is documented in this thesis. The proposed apparatus is the first of its kind, combining the power of high-resolution electron imaging and diffraction of TEM, the time resolution provided by pulsed laser, and the in-situ …
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Overcoming the limits of strain-induced martensitic transformation in metastable face-centered cubic alloys
… phase transformations activated by plastic straining are considered as one of the most effective pathways to promote strength while preserving desirable ductility. The resultant transformation-induced plasticity effect has enabled great success in advancing steels, titanium alloys, and more …
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Crystallographic origins of fast-ion conduction in pyrochlore
We have examined the crystallographic origins of fast-ion conduction in oxides with the pyrochlore structure-type, ideally A2B2O7, a superstructure of (A,B)20 3.5 defect fluorite-like array. These materials have technological promise for use in electrochemical devices such as oxygen sensors and …
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Gefügeeinfluß auf das Elektromigrationsverhalten von Kupferleitbahnen für höchstintegrierte Schaltungen
The increasing clock speed and the further reduction of the feature size in integrated circuits lead to increasing demands on the interconnecting material. Thus an increasing need for a metallization with low electrical resistance and high electromigration endurance exist. Copper can be count as a …
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Grain constraint and size effects in shape memory alloy microwires
Shape memory alloys exhibit interesting and useful properties, such as the shape memory effect and superelasticity. Among the many alloy families that have been shown to exhibit shape memory properties the ones based on copper are interesting because they are relatively inexpensive and show …
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Factors Influencing the Morphology of Sea Ice
Due to the continuous melting of sea ice and rising sea levels, more studies are conducted on sea ice morphology and factors influencing the growth of ice. Sea ice is an integral part of the global climate system. It plays a vital role in the polar ecosystem, providing a habitat for organisms. Sea …
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Beyond Embrittlement: In-Situ Explorations of Hydrogen Effects Near the Boundaries
Despite tremendous research efforts in the past decades, hydrogen embrittlement (HE) still limits the use of structural metals in hydrogen environments today. As the demand for hydrogen clean energy equipment increases, it is ever so pressing for us to extend our understandings of embrittlement …
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Electrochemical Flow System for Li-Ion Battery Recycling and Energy Storage
The wide applications of energy storage systems in consumer electronics, electric vehicles, and grid storage in the recent decade has created an enormous market globally. The electrochemical flow system has many applications in Li-ion battery recycling and energy storage system design. First, …
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Influence of mixed phases on the optoelectronic properties of Cs-Pb-Br compounds
… dissertation presents a correlative approach to investigate the influence of phase mixture on the optical properties of Cs–Pb–Br compounds. This material system exhibits three ternary phases, CsPbBr3, Cs4PbBr6 and CsPb2Br5, which coexist in Cs–Pb–Br materials when deposited by various methods. …
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NMR Studies on Protein Dynamics and Its Relevance to Functional Kinetics.
Existence of a strong relationship between protein's dynamics and its functional kinetics was suggested decades ago. Even though different groups investigated this relationship, technical difficulties and lack of appropriate methodology make full understanding of this relationship quite …
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Disruption of Immunoregulatory Functions of Intestinal Mesenchymal Stromal Cells and their Progenitors in Inflammatory Bowel Disease
… Ulcerative Colitis (UC), the two major forms of Inflammatory Bowel Disease (IBD), are multifactorial autoimmune diseases caused by an abnormal immune response to gut microbiota in genetically susceptible individuals resulting in dysregulation of type 1/2/17 immune responses. CD90+ …
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Evaluation of process-structure-property relationships of carbon nanotube forests using simulation and deep learning
… many applications. Yet, due to lack of manufacturing control, there is a huge performance gap between promising properties of individual CNTs and CNT forest properties that hinders their adoption into potential industrial applications. In this research, computational modelling, in-situ electron …
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