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.
Results
Showing 1 to 20 of 59 for “"Experimental campaign"”.
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Characterization of Collisional Shock Structures Induced by the Stagnation of Railgun-driven Multi-ion-species Plasma-jets
… and length scales make them difficult to study experimentally, but experiments on more reasonable scales can shed light on these phenomena. This body of work provides the basis for doing just that. The work begins by describing the development of a small, linear, plasma-armature railgun designed …
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In situ and post mortem surface chemistry measurements of boronization in the national spherical torus experiment upgrade
… eXperiment Upgrade (NSTX-U) during the 2015-2016 experimental campaign was boron conditioning. This method deposits ~10 nm of boron on the surface of the PFCs. The boron layer then acts as an oxygen getter, binding oxygen to the surface and preventing it from contaminating the plasma. The …
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Design Studies for Future EAD-Propelled Aircraft
… design optimizer. This thesis presents an experimental campaign to validate and improve models used by the optimizer. Models of interest are mass, drag, electrical, and structural. Preliminary experiments involve wing bending, charge-buildup on flight components, and large-scale thrust …
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Role of timber diaphragms in the seismic response of unreinforced masonry (URM) buildings
… a Rankine failure criterion. An in-situ testing campaign on full-scale 100 year old timber diaphragms is presented. Both mechanical and dynamic in-plane properties of wood diaphragms were investigated. Cyclic and snap back tests were carried out thanks to an innovative ad hoc loading system, …
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Generation of ultra-bright MeV gamma-ray beams from intense laser-matter interactions
… is followed by the findings from a recent experimental campaign in which NLTS was demonstrated experimentally which implies a peak brilliance of ∼ 1020 photons s−1mm−2 mrad−2 0.1% BW will be presented before a discussion of the likely future work that has been planned is given.
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Digital plasma control system and Alcasim simulation code for Alcator C-Mod
… since the beginning of the 2004-2005 experimental campaign. One of the advantages of a digital control system is that a simulator can be embedded in the system. We programmed a Matlab-Simulink simulator Alcasim for Alcator C-Mod. The simulator is a versatile tool to model the tokamak …
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Turbulent convection from an area source in a confined space
… For $\Gamma_0 \gtrsim 10^3$, newly-acquired experimental data presented herein reveals that an excess of dilution occurs in the proximity of the source relative to that predicted by classic integral models. Observationally, the increased dilution coincides with the appearance of features …
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Particle Image Velocimetry of Fluid Flow in an 85-Pin Hexagonal Rod Bundle with Spacer Grids for a Gas-Cooled Fast Modular Reactor
… the baseline core configuration of the FMR. The experimental thermal-hydraulic investigation consisted of the axial and radial flow field characteristics in the hexagonal fuel rod bundle composed of 84 fuel rods, a central control rod, and spacer grids at a Reynolds number of 12,000. The …
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Operation Mode Transitions in a Heaterless Hollow Cathode
… produce large populations of high-energy ions. Experimental research of a heaterless hollow cathode is presented with a specific focus on operation mode transitions in hollow cathodes. The first experimental campaign highlights a unique behavior where two mode transitions, instead of the …
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Reynolds stress model for hypersonic flows
… the last part of the thesis the results of the experimental campaign are illustrated and compared with numerical findings using different turbulence models. The comparison shows that for turbulent hypersonic flows the use of a second order closure model can considerably improve the agreement …
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Radiation Damage in CMOS Image Sensors for Space Applications
… and increases the dark current of such devices. Experimental work on proton damaged devices is presented, showing the effects on CTE and dark current. The results are compared to a standard CCD by a simulation to take into account the different dimensions and operating conditions of the two …
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Torsional behavior of RC beams strengthened with PBO-FRCM composite
… review and discussion of the previous experimental, analytical, and numerically-simulated torsional behavior of RC beams strengthened with FRP composite was introduced to gain a better understanding of their behavior. Then, an experimental campaign was conducted that included 11 solid …
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Development of Algorithms for Quantitative Analysis of Long Electrical Arcs in Crossflows
… de Catalunya (UPC) conducted an extensive experimental campaign in April 2024 that investigates this coupling in detail for the first time. Data gathered from this experiment include electrical properties of the arc, high-speed video of the arc column, and the velocity field of the …
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Manufacturing and Characterization of Gold-Black and Prediction and Measurement of its Directional Spectral Absorptivity
… reported in the literature. However, suitable experimental data were not available to validate the theory for directional spectral absorptivity. Therefore, an experimental campaign to fabricate and measure the directional spectral behavior of gold-black had to be undertaken to validate the …
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The infuence of hail on wind turbine blade leading edge erosion and damage
… with hail impact.;From these impressions, an experimental campaign was carried out to investigate the effects on of repeated impact of simulated hail ice (SHI) on composite materials. Hailstones at four different diameters (5 mm, 10 mm, 15mm and 20mm) were fired at a range of velocities and …
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Experimental investigation of liquid fragmentation in hypersonic cross flow
This thesis presents an experimental investigation carried out to study penetration and fragmentation of liquid injected into Mach 6 hypersonic cross flow. Flow topology, shock and vortex systems, fragmentation and atomization mechanisms are investigated using high-speed photography, Schlieren …
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Experimental and numerical validation of ion extractor grids
"The experimental plasma thruster named the Helicon Injected Inertial Plasma Electrostatic Rocket (HIIPER) at the University of Illinois at Urbana-Champaign (UIUC) is currently being investigated. HIIPER features an Inertial Electrostatic Con nement (IEC) grid that is made asymmetrical by cutting …
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Timber shear walls for a sustainable build future
… are then applied to a real case of existing experimental data regarding a four point bending test of CLT beams. Stiffness and strength of CLT are essential parameters for the definition of models to be adopted in codes regarding timber buildings, in particular for the calculation of shear …
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The application of a machine vision system to relate to froth surface characteristics to the metallurgical performance of a PGM flotation process
… influence flotation performance. A plant-based experimental campaign was then conducted on the Amandelbult Merensky Primary Rougher Flotation Section, in which the frother and depressant levels were manipulated. In terms of metallurgical performance of the flotation system, it was found that a …
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Characterization of cavitation instabilities in rocket engine turbopump inducers
… cavitation onset is assessed through novel experimental analysis and a previously developed body force modeling approach using the MIT inducer, representative of the design of the Space Shuttle main engine low-pressure oxidizer pump inducer. A previously developed temporal and spatial …
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