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 73 for “"in situ monitoring"”.
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In-Situ Monitoring Of 3D Printing Through Computer Vision
… è presente nell'allegato / the abstract is in the attachment
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In-situ monitoring of photocatalytic reactions in optofluidic microreactors
To advance the state-of-the-art technology in photocatalysis, there is a growing need to develop optically efficient microreactors that allow rapid changes in reaction conditions for catalyst screening. In addition, such microreactors should offer strong light-matter interactions for the in-situ …
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In-Situ Monitoring of Additive Manufacturing Using Digital Image Correlation
<p>Advances in additive manufacturing over the past decade have led to applications in multiple fields. In particular, additive manufacturing answers the need for high flexibility in designing complex structures, however, the rapid thermal fluctuations during processing lead to numerous defects and …
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In situ monitoring and biogeochemical cycling of nutrients in estuarine waters
This thesis describes the use of in situ and laboratory techniques for monitoring nitrate, phosphate and master variables in the environment. Chapter One presents a general overview of nutrients, how they are essential for aquatic biota, their general characteristics and the importance of their …
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In-situ monitoring of groundwater radionuclides with emphasis on tritium detection
… with the detection of low energy beta emitting radioisotopes from a source of groundwater, with particular emphasis on tritium (3H). This is investigated firstly through an understanding of the challenges of detecting tritiated water, which involves the use of Monte Carlo simulations, …
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Hardware Architectures for Low-power In-Situ Monitoring of Wireless Embedded Systems
… to large-scale commercial deployments, providing reliable and dependable system operation becomes absolutely crucial to ensure successful adoption. However, the untethered nature of wireless embedded systems severely limits the ability to access, debug, and control device operation after …
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Debonding failure of CFRP reinforced concrete beams and in-situ monitoring schemes
Fiber Reinforced Polymer (FRP) systems have gained much popularity as a method for reinforcing existing concrete structures. However a variety of sudden failure methods, such as debonding, delamination, and creep rupture have led to the development of code limitations on the strength that an FRP …
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FLOW INJECTION INSTRUMENTATION FOR THE IN SITU MONITORING OF NUTRIENTS IN SEA WATER
In order to investigate the biogeochemistry of aquatic ecosystems, a quantitative understanding of primary production and the temporal and spatial distribution of nutrients is necessary. This thesis describes the development of a submersible FI based nutrient sensor for the in situ determination of …
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Flow injection chemistries for the in situ monitoring of nutrients in sea water
In order to investigate the biogeochemistry of aquatic ecosystems, a quantitative knowledge of nutrient status i.e. spatial and temporal distribution, and primary production is necessary. This thesis describes chemistries for the determination of the major nutrient species, nitrate (as total …
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In situ monitoring of reactive ion etching using a surface micromachined integrated resonant sensor
This research explores a novel in-situ technique for monitoring film thickness in the reactive etching process that incorporates a micromachined sensor. The sensor correlates film thickness with changes in resonant frequency that occurs in the micromachined platform during etching. The sensor …
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In-Situ Monitoring and Simulations of the Non-Isothermal Crystallization of FFF Printed Materials
… the development of methods and models to aid in optimization and development of new materials for Fused Filament Fabrication (FFF). We demonstrate a novel FFF nozzle design to enable the first measurements of in-situ rheology inside FFF nozzles, which is critical for part performance by …
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On the feasibility of integrated optical waveguide-based in situ monitoring of microelectromechanical systems (MEMS)
This dissertation explores the feasibility of using integrated optical waveguides to measure the motion of microelectromechanical structures (MEMS). MEMS are a class of silicon devices which are being developed as sensors and actuators. Because these free moving structures are fabricated using …
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Real time in-situ monitoring and control of silicon epitaxy by Fourier transform infrared spectroscopy
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1994.
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Solid state amperometric sensor for the in-situ monitoring of slag composition and transport properties
… for several decades for better process control in metals industries. Such devices can accurately determine the oxidation state of the molten metal phase. Investigators understand the importance of the slag phase on the quality of the final product and therefore similar devices have been …
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Towards Cyber-Physical Security for Additively Manufactured Parts via In Situ Monitoring and Electromechanical Impedance
The layer-by-layer nature of additive manufacturing (AM) allows for toolless fabrication of highly complex geometries that cannot be made via traditional processes. AM is unique in its ability to precisely define both the material properties and geometric shape throughout the volume of a part, …
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Development of In Situ Monitoring and Data-Driven Modeling for Complex Systems: Case Study on Simulant Mixtures of Nuclear Waste
… stored at the Hanford and Savannah River Sites in the United States. One of the main challenges associated with nuclear waste treatment and stabilization is the complexity of the waste, which calls for extensive sampling during processing. In this thesis, the use of Process Analytical Technology …
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In-situ monitoring of an Omni directional roof vent on a low slope single ply roof to identify most efficient porous underlayment for maximum pressure propagation
An experimental study was carried out on a single-ply low-slope roof using a series of different underlayment layers to test and understand distributional characteristics of negative air pressure throughout the roof assembly, when subjected to suction pressure corresponding to different wind …
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Relationships between sea surface temperature and nutrients in satellite detected oceanic fronts
Satellite ER images of the California coast off Point Sur reveal recurrent surface features which appear to be "thermal discontinuities" associated with aperiodic upwelling events. Some of these have associated "chemical fronts" and increased biological activity. Satellite IR imagery was used to …
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Direct dehydrative N-Pyridinylation of amides, the interrupted Bischler-Napieralski reaction, and the enantioselective total synthesis and arylative dimerization of aspidosperma alkaloids
I. Direct Dehydrative N-Pyridinylation of Amides A method for the single-step N-pyridinylation of secondary amides is described. The process involves electrophilic activation of secondary amides with trifluoromethanesulfonic anhydride in the presence of 2-fluoropyridine followed by introduction of …
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Stroboscopic Inline Coherent Imaging
Inline coherent imaging (ICI) is an in-situ monitoring technique, used in laser processing applications such as welding and additive manufacturing. Conventional ICI systems image with a continuous-wave broadband light source, which makes the system susceptible to an effect known as motion artifact. …
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