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 41 for “"GDi"”.
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Piston fuel film observations in an optical access GDI engine
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2000.
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Combustion characteristics of synthetic gasoline in modern charge boosted GDI Engines
… using a modern, charge boosted, single cylinder GDI research engine. While the engine operation was verified to be in the negative-K region using model fuel components, anomalies in de fining the K-value using the synthetic blends were discovered. A fuel blending model was composed to allow …
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GDI: (Goal Directed Interface): An intelligent, iconic, object-oriented interface for office systems
This dissertation presents the GDI (Goal Directed Interface) approach to the user interface for office systems. The primary objectives of the approach are to create an interface that (1) requires little user training and (2) tries to perform higher level task activities (ex. 'schedule a meeting') …
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Assessing the effects of ethanol addition on particulate matter emissions in GDI engines
… addition on particulate matter (PM) emissions in GDI engines show diverse results. In this thesis, an overview on three major aspects, PM formation, effects of engine operating conditions, and ethanol effects, unveils the large number of factors that can simultaneously affect PM emissions from …
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Combustion Visualization And Particulate Matter Emission Of A Gdi Engine By Using Gasoline And E85
… product development. Gasoline direct injection (GDI) engines have been popularized due to its higher power density, fuel efficiency, and the possibility for advanced engine technologies over conventional port-fuel-injection (PFI) gasoline engines. However, many issues are heavily investigated, …
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Effect of market fuel variation and cetane improvers on CAI combustion in a GDI engine
… CAI combustion in a gasoline direct injection (GDI) engine. The test fuels were blends of different commercial refinery products, containing hundreds of hydrocarbon species. The blends were selected to vary Research Octane Number (RON), olen content, and aromatic content. The blends were chosen …
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A Genome-Wide RNAi Screen Identifies CDC-42 and GDI-1 as In Vivo Regulators of Invadopodia
… invadopodia formation through WSP-1. RabGTPase GDI-1 is a novel regulator of the unique membrane compartment required for invadopodia formation. CDC-42 and GDI-1 both function downstream of an unknown cue secreted by the cells targeted by the AC for invasion, illustrating that extracellular cues …
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CFD Modelling of Down-Sized GDI Engines: Fuel Injection, In-Cylinder Phenomena and Correlation to Engine-Out PN Emissions
… to minimise the sooting tendency in modern GDI engines, and for the development of new synthetic fuels with prescribed thermo-physical properties. Finally, an elastic net regression methodology is used to generate simple surrogate models linking cylinder-out PN and engine control parameters …
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Examining Plasma Instabilities as Ionospheric Turbulence Generation Mechanisms Using Pseudo-Spectral Methods
… in this work are the gradient drift instability (GDI) and the Kelvin-Helmholtz instability (KHI). The likelihood of the development of the GDI during the August 17, 2017 total solar eclipse is studied numerically. This analysis uses the ``Sami3 is Also a Model of the Ionosphere" (SAMI3) model to …
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Computational Investigation of Ethanol and Bifuel Feasibility in Solstice Engine
A Gasoline Direct Injection (GDI) engine enables an increased fuel efficiency and higher power output than a conventional Port Fuel Injection (PFI) system. By injecting pressurized fuel straight into each cylinder of an internal-combustion engine, the degree of fuel atomization is increased, as …
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Investigations on the pollutant emissions of gasoline direct injection engines during cold-start
… downsized gasoline direct injection (GDI) engine provides a mature platform to achieve better fuel economy. For this reason, it is expected that the GDI engine will capture increasing shares of the market during the coming years. The in-cylinder liquid injection, though advantageous in …
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Design, setup of an optically accessible internal combustion engine for study of gasoline direct injection combustion
Gasoline direct injection (GDI) engines are becoming attractive options for automobiles. The precise control over fuel delivery increases the potential for better fuel efficiency and higher performance. In this study, a single-cylinder optically-accessible engine was built to visualize GDI …
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Regulation of Guanine Nucelotide Exchange in Inhibitory G Protein Alpha Subunit by Activator of G Protein Signaling 3 and Novel Regulatory Peptides
… by guanine nucleotide dissociation inhibitors (GDIs). The beta gamma subunit of heterotrimeric G protein and GoLoco motif are GDIs. Activator of G protein signaling 3 (AGS3), a GDI containing four GoLoco motifs in its C-terminal domain (AGS3-C), binds specifically to GDP-bound Gai1 and inhibits …
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Three-Dimensional Fluid Simulations of Mid-Latitude Ionospheric Processes with Hybrid Chebyshev/Fourier Pseudo-Spectral Methods
… thesis explores the Gradient Drift Instability (GDI) and Kelvin-Helmholtz Instability (KHI) to understand their potential roles in driving mid-latitude ionospheric turbulence and irregularities.par Initial investigations involved a two-dimensional (2D) numerical model to study density …
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Modeling of Air-Assisted and Flash Boiling Sprays in Gasoline Direct Injection Engines
… substantially compared with a conventional GDI fuel injector. The air-assisted fuel injector produced the softest sprays in this study, but flash boiling may be more cost-effective for the automotive industry. The modeling methods developed by this work may be useful for the optimization and …
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The Mid-Latitude Ionosphere: Modeling and Analysis of Plasma Wave Irregularities and the Potential Impact on GPS Signals
… relation of the Gradient Drift Instability (GDI) including finite ion gyro-radius effects is also solved to consider decameter-scale waves gen- eration. The TGI and GDI calculations are obtained over a broad set of parameter regimes to underscore limitations in fluid theory for short …
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Addressing Indirect Functional Connectivity in Neuroscience via Graphical Information Theory: Causality and Coherence
… framework, graphical directed information (GDI), enables pairwise directed functional connections to be conditioned on substantially more processes, producing a more accurate graph of direct causal functional connectivity in the time domain. GDI correctly inferred the circuitry of simulated …
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Ash impacts on gasoline particulate filter performance and service life
… increased use of gasoline direct-injection (GDI) engines in light-duty vehicles (LDV). Separate new regulations that aim to reduce particulate emissions to address air pollution concerns are taking effect concurrent with greenhouse gas limitations in both jurisdictions. GDI engines are proven …
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Application of Multidisciplinary Design Optimisation Frameworks for Engine Mapping and Calibration
… calibration optimisation of a JLR AJ133 Jaguar GDI engine; and calibration optimisation of an EU6 Jaguar passenger car diesel engine. These case studies illustrated that: -The proposed sequential DoE strategy offers a coherent framework for the engine mapping process including Screening, Model …
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Surgical outcomes for the ambulatory child with cerebral palsy
… improvement in the Gait Deviation Index (GDI). The second finding is support for the belief that an accurate gait outcome assessment for a given intervention should include both functional and technical gait measures. The third finding suggests that when conducting and analyzing gait …
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