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 25 for “"High-temperature environments"”.
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The Comprehensive Study of High Viscosity Friction Reducers in High-TDS and High-Temperature Environments
<p>"High viscosity friction reducers (HVFRs) have been recently gaining more attention and increasing in use, not only as friction-reducing agents but also as proppant carriers. Reusing of produced water has also been driven by both environmental and economic benefits. Currently, most friction …
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Development of a Miniature, Semi-Distributed Sapphire Fiber Optic Thermometer for Harsh and High Temperature Environments
Fiber optic temperature sensing has become a well-defined field in the past few decades [1] through the use of Fiber Bragg Gratings, Fabry-Perot interferometry, and pyrometry, to list several techniques in use today. The use of fiber optics offers significant advantages over electronic sensing in …
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Study of glass-ceramics and brazing alloys for joining oxide and non-oxide ceramic matrix composites in corrosive and high-temperature environments
L'abstract è presente nell'allegato / the abstract is in the attachment
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A computational analysis on an initial application of a Hemiwedge based sub-surface safety valve for use in ultra-deepwater oil wells and extreme high pressure, high temperature environments
… to harvest these new oil reserves from extreme high-pressure/high-temperature (XHPHT) environments. Computational fluid dynamics (CFD) in the Ansys RTM CFX flow solver is used to study the flow properties of crude oil through the valve, while both AnsysRTM and SolidWorks RTM Simulation are used …
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Improving the thermal shock resistance of zirconium diboride ceramics
… of ZrB₂-based materials for their use in high temperature applications, the thermal shock properties have not been investigated extensively. Materials expected to be used in ultra-high temperature environments (i.e. rocket propulsion and hypersonic flight) will be required to maintain …
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Eddy current displacement sensor with LTCC technology
… related measurement conditions such as harsh and high temperature environments, non-magnetic metal blades, etc. Then, according to the structure of the LTCC sensor coil, a set of analytic calculating methods based on fundamental equations of the inductance and the capacitance between two simple …
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Overview and development of a wide bandgap, high temperature circuit and measurement solution
… in investigating the design and feasibility of a high temperature power converter for various applications. From the dawn of wide bandgap materials, primarily gallium nitride (GaN) and silicon carbide (SiC), research has pushed toward high temperature power circuit operation to either reduce …
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Photoinduced Fresnel reflectors in germanium-doped optical fibers
… optical fibers via ultraviolet light from a high power excimer laser. These refractive index changes cause Fresnel reflections at the boundary of the higher photoinduced index change and the lower index in the unexposed core. The boundary of the two refractive indices may be considered a low …
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High Temperature Silicon Carbide Mixed-signal Circuits for Integrated Control and Data Acquisition
… popularity as a substrate for power devices for high temperature and high voltage applications over the last two decades. Recent research has been focused on the design of integrated circuits for protection and control in these wide bandgap materials. The ICs developed in SiC and GaN can not only …
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Curing Characteristics of Photopolymer Resin With Dispersed Glass Microspheres in Vat Polymerization 3D Printing
… the ability to cure photopolymer resin with high filler volume fraction is important to 3D print material specimens for specific engineering applications, e.g. structural polymer composite materials, electrical and thermal conductive materials, and ceramic materials for biological and …
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Development of a One and Two-Dimensional Model for Calculating Pore Pressure in an Ablating Thermal Sacrificial Liner
… of charring or decomposing materials exposed to high temperature environments is an essential aspect in rocket design. In particular, the tip of re-entry vehicles and sacrificial rocket nozzle liners are both exposed to extremely high temperatures. This thesis is specifically concerned with …
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Flame Assisted Additive Manufacturing for the Synthesis of High-Temperature Materials
… an emerging technology for producing high-temperature materials non-traditionally, offers a promising solution. This method enables 3D printing of materials that can withstand high-temperature environments, which are crucial in nuclear reactions and aerospace applications. Additive …
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Short Distance Telemetry for Piston Monitoring. Design and Development of Short Distance Telemetry for Engine Condition Monitoring.
Piston telemetry research involves monitoring the temperatures at specific internal location points within a combustion engine piston. The temperatures are detected with type K thermocouples as voltages and processed to convert them into temperatures using cold junction compensation methods. The …
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Improvement in Adhesion for the Epoxy-SiC System via Plasma and Silane Surface Modification Techniques
… Due to adverse operating conditions such as high moisture and high temperature environments, the adhesion between an adhesive and its substrate is typically compromised. This thesis addresses the advantages of employing plasma pretreatments and surface derivatization using silane coupling …
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Design and Manufacture of an Ultrasonic Transducer for Long-term High Temperature Operation
… design of ultrasonic transducers suitable for high temperatures is introduced. The transducers are targeted for trouble-free continuous operation at 700-800 째C for at least two years, with sufficiently wide bandwidth to yield good temporal resolution. The design and manufacturing procedures …
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The rheology and dynamic properties of biopolymers in a colloidal suspension
… and exhibit excellent resistance against high shear and high temperature environments. To further expand the application of these biopolymers, there is a need to understand their rheological properties and the mechanism of biopolymer-water interactions. To date, there is still no consensus …
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INVESTIGATION ON RHEOLOGY OF CEMENT PASTE AND CONCRETE AT HIGH TEMPERATURE
… various chemical admixtures and subjected to high temperature and prolonged mixing time. The thesis also aimed at formulating recommendations for the effective use of chemical admixtures in high temperature environments. In order to achieve these objectives, the rheological properties of …
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INVESTIGATION ON RHEOLOGY OF CEMENT PASTE AND CONCRETE AT HIGH TEMPERATURE
… various chemical admixtures and subjected to high temperature and prolonged mixing time. The thesis also aimed at formulating recommendations for the effective use of chemical admixtures in high temperature environments. In order to achieve these objectives, the rheological properties of …
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Characterization of the mechanical properties of freestanding platinum thin films
… industry because of its chemical inertness and high temperature stability. However the mechanical properties of platinum remains the least exploited. Platinum has a high Youngs Modulus (164 GPa, for bulk) and high melting temperature (1768 oC) and therefore can be used as a 'thin film' structure …
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