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 173 for “"Aft"”.
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The Design and Evaluation of a High Frequency Fore-Aft Probe
A high-frequency surge and stall sensing fore-aft probe was developed at the Turbomachinery Research Laboratory at Virginia Tech. The probe was designed to detect surge and stall based on changes in large regions of flow behind a turbofan engine compressor fan. The probe exhibited excellent …
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Internal flow investigation of an aft finocyl grain configuration in a solid rocket motor
… clear acrylic models of the proposed submerged aft-dome and aft finned grain elements were constructed to simulate the aft segment of the SRM at ignition and 35 seconds into the firing sequence. Pressure, velocity, and turbulence profiles were obtained during cold air testing, while air bubbles …
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Modeling of Herschel/Quincke-Liner Systems for the Control of Aft Fan Radiation in Turbofan Engines
… in turn have translated into more stringent aircraft noise regulations. As a result, large amounts of resources have been diverted towards the improvement of existing noise attenuation technologies and the development of more effective ones. In terms of turbofan generated noise, the most widely …
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40Ar/39Ar, AFT and (U-Th)/He thermochronologic implications for the low-temperature geological evolution in SE Sweden
… °C to c. 300 °C, whereas apatite fission-track (AFT) and (U-Th)/He thermochronology were used to determine the thermal evolution between c. 120 °C and c. 50 °C. The crystalline bedrock in the Forsmark area consists of c. 1.89-1.85 Ga meta-igneous rocks that form part of the Svecofennian orogen. …
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An experimental study of the aft guide vanes of an engine bypass nacelle for low-boom supersonic flight
… boom is through shape-tailoring of the aircraft body and of the propulsion system. To this end, a new supersonic engine concept has been proposed, wherein a core turbofan engine, which has a non-axisymmetric external profile due to a protruding gearbox, has been circularized. A new, …
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Experimental and Numerical Investigation of Forward and Aft Swept Stepped Planing Hulls in Calm Water and Regular Waves
Stepped hull forms are hulls with a vertical step in the hull bottom to improve performance at top speed. Stepped hulls are well documented anecdotally and scientifically to improve calm water performance at high speeds, but commonly demonstrate dangerous and unexpected dynamic instabilities during …
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The Role of Aid for Trade and Foreign Direct Investment in Poverty Reduction: A Panel Data Analysis of 91 Developing Countries
<p>Aid for trade (AFT) focuses on helping developing nations to overcome supplyside constraints in trade to maximize trade benefits and use trade to achieve economic growth and poverty reduction. Since its inception at the 2005 Hong Kong ministerial conference, AFT has become viewed as a crucial …
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High lift configuration of a slotted natural laminar flow airfoil
… injection of momentum to the flow over the aft-element upper surface, improving lift generation. However, an unfortunate side effect of the S414 is an abrupt, leading-edge stall type. This investigation focused on the development of a high-lift configuration of the S414 by altering the …
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Λιπομεταφορά στην αποκατάσταση του μαστού: αυτόνομη εφαρμογή και συνδυασμός με άλλες τεχνικές αποκατάστασεις
ΣΚΟΠΟΣ: Η αυτόλογη λιπομεταφορά (AFT) αποτελεί τα τελευταία χρόνια μία ελκυστική τεχνική στην αποκατάσταση του μαστού, είτε ως αυτόνομη μέθοδος είτε σε συνδυασμό με ενθέματα σιλικόνης και αυτόλογους κρημνούς. Σκοπός της παρούσας διπλωματικής εργασίας είναι η αξιολόγηση της αποτελεσματικότητας, της …
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Simulation Comparisons of Semi-Parametric Accelerated Failure Time Model With Different Bandwidths
… (PH) model and the accelerated failure time (AFT) model are the most popular models to fit the censoring data. Sometimes, the PH assumption cannot be satisfied, and therefore, the AFT model becomes a useful alternative to the PH model. Comparing with the least square method and the rank …
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Neoproterozoic to Holocene tectonothermal evolution of the southern Cantabrian Mountains NW Iberia, revealed by apatite fission-track thermochronology
… experimental and geologic information from 32 AFT samples there gathered. The Cantabrian Zone, a nearly complete Palaeozoic succession has been characterised as the thin-skinned tectonism dominated arcuate foreland fold-and-thrust belt. South of the León Line fault system non-metamorphic …
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Degradation Of Selected Organic Agrochemicals In Artificial Soil Slurry Systems By Anodic Fenton Treatment
… systems. A kinetic model, called the slurry AFT model, was developed to describe the degradation process in the slurry system. Effects of different model soil components, such as humic acid, kaolin or montmorillonite clay, and goethite, on the degradation of different groups of agrochemicals, …
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Effects of rotor tip blade loading variation on compressor stage performance
… provided results for determining if aft-loading rotor tip would yield a stage performance benefit in terms of a reduction in loss generation. Aft-loading rotor blade tip yields a relatively less-mixed-out tip leakage flow at the rotor exit and a reduction in overall tip leakage mass …
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Computational Assessment of Flow through a High-Flow Nacelle Bypass for Low Supersonic Boom
… community to enable high- speed civilian aircraft flying supersonically over populated land. One of the concepts proposed to reduce sonic boom incorporates a high-flow secondary nacelle bypass to enclose the engine and its protrusions where the flow is diverted around a gearbox through a set of …
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A study into the fundamental understanding of iron-transformations and the effect of iron as fluxing agent on Highveld fine coal sources during gasification
… samples. The ash fusion temperature analyses (AFT) were used to study the slagging behaviour of the iron-spiked coal samples. Even though AFT analyses only provide an average flow property, it gives a good indication of the changes that the iron addition induces in coal properties. FactSage …
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Development of Afatinib lipid nanoparticles targeting non small cell lung cancer
… developed for the quantification of afatinib (AFT) in formulations. Novel drug delivery systems based on cationic (CL) and pH-sensitive liposomes (PSL) for AFT were developed, with different ratios of lipid to AFT, using a film hydration method. The obtained liposomes had a small particle size …
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Tectonic and climatic controls on orogenic processes : the Northwest Himalaya, India
… 40Ar/39Ar white mica and apatite fission track (AFT) thermochronologic data provide the opportunity to determine the history of rock-uplift and exhumation paths along an approximately 120-km-wide NE-SW transect spanning the greater Sutlej region of the northwest Himalaya, India. 40Ar/39Ar data …
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Statistical model on student performance in UTHM by using non-parametric, semi-parametric and parametric survival analysis
… using the survival and Accelerated Failure Time (AFT) models and estimate the time ratio (TR) of student performance in accordance to the selected best model. The survival analysis considered the survival approach such as the Kaplan-Meier (KM) method in the non-parametric method, Cox model in …
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Exploring Passive Flow Control Techniques Applied to a Supersonic Multistream Rectangular Nozzle
… a Single Expansion Ramp Nozzle (SERN) onto an aft-deck. Previous efforts for the nominal nozzle configuration have shown that an instability initiated at the splitter plate trailing edge (SPTE) influences the effectiveness of the third stream as a barrier for the aft-deck and persists through …
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