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 32 for “"jet stream"”.
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Nonlinear gravity wave-wind interactions and jet stream gravity wave generation.
Thesis. 1977. Ph.D.--Massachusetts Institute of Technology. Dept. of Earth and Planetary Sciences.
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Simulation of liquid induced annulus wall boundary layer in a pipe flow, with dense net of jet cross flows
… into the flow region with dense net of jet stream cross flows through the pipe wall. The concept behind this analysis is the idea that a thin liquid annulus could reduce scale deposite from a silica rich geothermal fluid. Topics related to this fluid dynamics analysis is advance mixing …
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An Investigation of Methods to Homogeneously Entrain and Suspend Abrasive Particles in a Low Pressure Dental Water Jet
<p>During the past several decades, the water jet cutting concept has developed from a novel concept into a well-accepted machine cutting tool. With the addition of abrasive particles and the improvement of high pressure pumps, the water jet stream is currently capable of cutting through metal, …
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A Reconstruction of Post-Glacial Hydroclimatic Change and Mass Accumulation Rates from a Small Watershed of the Lower North American Great Lakes Region
… in the shape and latitude of the Polar jet stream, which dictated atmospheric circulation patterns. During the late Pleistocene to early Holocene, the Laurentide Ice Sheet forced the jet stream south, resulting in reduced precipitation. Following the ice sheet collapse, declining summer …
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Clear Air Turbulence analysis using isentropic methods.
… situation indicates the importance of the jet stream structure in this case. The study reveals that analyzed areas of low Ri and high wind shear correspond very well to reports of CAT. The objective analysis performance is fair overall. It shows a distinctive weakness in the analysis of the …
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The soil ecology of Serratia entomophila, A bacterial pathogen of the New Zealand grass grub, Costelytra zealandica (White)
… by susceptible larvae. Conventional boom spray, jet stream and turf treatment application methods were evaluated for their success in placement of S. entomopbila into pasture. Turf treatment deposited more bacteria into the soil than surface treatments, jet stream and spray. Turf-applied bacteria …
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Marine weather variability, tropical cyclone prediction and impacts in the Southwest Indian Ocean
… southeast Pacific. It appears to foretell of downstream oscillations in the sub-tropical jet stream which bifurcates and govern wind shear over the Indian Ocean. A duct pattern seems to promote negative vorticity anomalies of -2.0X1061 and convergence anomalies of +1.2X106s *over SWIO. An …
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The Nocturnal Low-Level Jet in Tropical West Africa: Generation and Representation in Various Data Archives
… West Africa often experiences a low-level jet stream after sunset. In general, such jets are believed to be produced as a response to the sudden decrease in turbulence in the boundary layer when daytime heating ceases. However, the nocturnal low-level jet (NLLJ) in West Africa exists in a …
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Deposition of Newtonian Particles Entrained in a Turbulent Axisymmetric Free Jet
… study of particles entrained in axisymmetric air jets. An experimental rig was designed and built to study entrainment properties and deposition of Newtonian particles, after injection into a turbulent axisymmetric free air jet. Newtonian spherical particles, ranging from 1mm to 6mm in diameter, …
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Wind shear and differential upwelling along the South Western tip of Africa
… through interactions with the circumpolar jet stream. Low level winds accelerate over portions of the southern Benguela current region through deflections forced by three pronounced capes, two with mountain ridges exceeding 1000 m. Selected case studies are utilized to contrast the …
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Long-term Changes in Synoptic-Scale Air Mass Persistence Across the United States
… suggested northward migration of the polar jet stream.
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Multi-Scale Atmospheric Dynamics of Extreme Saharan Dust Storms Resulting in Dust Transport Out of Africa to Iberia and the Atlantic
… Rossby wave breaking (RWB) process in the polar jet stream linked through nonlinear wave reflection as an upper-level synoptic precursor prior to forming strong dust plumes and (2) the downscale dust plume organization/restructuring by different meso-β/γ scale terrain-induced features including: …
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Neighboring upper level jet streaks, their proximity, and their synergestic coupling of the divergent regions
… troposphere is: How close is close enough for jet streaks to be considered coupled? The phrase, 'coupled jet streaks' refers to two individual jet streaks working synergistically to impact the weather. Jet streaks are isotach maxima that occur within a jet stream. This question beseeches an …
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Development and Applications of Liquid Sample Desorption Electrospray Ionization Mass Spectrometry (DESI-MS)
… from solution phase, fast "flying" liquid jet stream containing analyte can also be analyzed by DESI spray, from small amino acids to large proteins. Therefore, the concept of microsecond time-resolved DESI was developed to study the fast reaction kinetics by ionizing the jet stream after …
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Investigating the link between Arctic sea ice, North Pacific geopotential height anomalies, and precipitation across the United States
The student, Zachary Zobel, submitted this Thesis for approval on 2015-07-15 at 22:36.
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Analysis of deposition, erosion, and landscape stability during the late Quaternary using multi-proxy evidence from Owl Creek, Central Texas, USA.
… change, but have been understudied in low order streams in central Texas, USA. An exposure along Owl Creek a tributary of the Brazos River was examined using geological and pedological approaches, including stratigraphic and soil description and characterization. Eight stratigraphic units were …
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Theory and Observations of Horizontal and Vertical Structure of Gravity Wave Perturbations in the Middle Atmosphere
… is believed to be geostrophic adjustment of the jet stream.
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Heat Transfer Assessment of Aluminum Alloy Corrugated Naval Ship Deck Panels under VTOL Aircraft Thermal Loads
… core in typical operation. In this study, a jet stream intended to replicate the key physics of the core of a VTOL aircraft plume was impinged onto the upper surface of aluminum alloy corrugated deck panel test specimen. Temperature measurements are taken via thermocouples on the face of the …
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Circulation and convection in the Irminger Sea
… reanalysis products. Westerly Greenland tip jet events are intense, small-scale wind phenomena located east of Cape Farewell, and are important to circulation and convection in the Irminger Sea. A climatology of such events was used to investigate their evolution and mechanism of generation. …
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High Resolution Paleolimnology of Lakes in the Athabasca Oil Sands Mining Region, Alberta, Canada
… the expression shift to movement of the jet stream, which controls air mass distribution at this locality. An investigation of the ecological character of ALE from 1875 AD - present reveals that the arcellacean community was also influenced by climate anomalies and that decreased nutrient …
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