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 108 for “"the hub"”.
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Adiabatic Effectiveness Measurements of Leakage Flows along the Hub Region of Gas Turbine Engines
… cooling schemes have been developed to cool the blades using cooler air from the compressor. Unfortunately, the clearance gap between adjacent hub sections allows coolant to leak into the hub region. Coolant flow also leaks into the hub region through gaps between individual stages. The …
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Rethinking the hub and spoke airline strategy : an analysis and discussion of American Airline's decision to depeak its schedule at O'Hare International Airport
The airline industry downturn that began in early 2000 was exacerbated not only by the terrorist attacks in the United States on September 11, 2001, but also by other pressures for strategic change. Continued growth and competition of low cost carriers coupled with changing purchasing habits of …
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Redesign of a wind turbine hub
The current designs of wind turbine hubs contain many faults. The slew ring bearing that connects the blade to the hub takes on a large bending moment that in many cases causes the joints to fail and the blade to break off. The design of the hub is very large, heavy, and expensive to machine. The …
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Six-Axis Levitated Stage with a Novel Flux-Steering Magnetic Hub Actuator
This thesis presents a two-axis, permanent-magnet-biased, flux-steering actuator and its integration into a levitated stage. The hub actuator consists of a steel stator ring (165 mm OD) and a steel mover cylinder (52 mm OD). The stator has four teeth evenly spaced and pointing radially inward, each …
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An Investigation into the impact of the spanwise flow field at rotor inlet on the performance of mixed flow turbines
… equipped with turbochargers to increase the power output. This has placed a greater emphasis on turbocharger performance across the full operating range. Therefore, turbocharger turbines must be capable of operating with high efficiency at off-design conditions, as well as possessing a …
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Confocal Characterization of the Apical Testes and Ultrastructural Analysis of the Seminal Visicles of Drosophila pseudoobscura
<p>The Drosophila genus contains thousands of different species. Drosophila melanogaster is the most popular Drosophila species used in biological research. Drosophila pseudoobscura is the model Drosophila species used in our laboratory and is a distant relative to D. melanogaster. Both of these …
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Detecting presence Of Malicious Hub in MIMI Protocol for Cross-Platform Messaging Interoperability
The More Instant Messaging Interoperability (MIMI) protocol enables interoperable group messaging across otherwise isolated services such as WhatsApp, Signal, and Telegram. It routes every Messaging Layer Security (MLS) ciphertext through a central hub that timestamps the message and broadcasts it …
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Heuristics for airline schedule recovery via the virtual hub model
… incur significant additional costs when bad weather at a hub-airport causes delays and cancellations throughout their entire network. One new recovery strategy called the virtual hub alleviates the effects of large delays at a hub-airport by setting up and diverting flight legs to nearby …
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A Hybrid Vortex Solution for Surge Margin Enhancement in Axial Compressors
<p>A new vortex solution to the Simple Radial Equilibrium Equation (SREE) is presented that incorporates endwall effects into the preliminary design stage of a single stage, low pressure compressor with a hub-to-tip ratio of 0.4 and non-axial inlet flow. This vortex solution is proposed to overcome …
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Proposal for improving inventory replenishment through lean tools in a peruvian retail company
The purpose of this research work is to improve the replenishment of inventories in a retail company, due to is essential for any company to meet the demand for the product. This is why through the percentage of canceled orders in the retail company and by an Ishikawa diagram it was determined that …
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Performance Improvement through Velocity Triangle Optimization-Driven Redesign for Mitigating the Horseshoe Vortex in Axial Turbines
<p>Momentum differences between the neighboring streamlines at the end wall/primary flow interaction region of an axial turbine stage induce three-dimensional vortical flow structures, such as the leading edge horseshoe vortex, resulting in significant aerodynamic performance deterioration. …
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Improving the Efficiency of Hub Operations in a Less-than-Truckload Distribution Network
The less-than-truckload (LTL) industry is highly competitive, with recent average profit margins less than 3%. LTL shipments are routed through a network of service centers and hubs. The performance of the entire LTL distribution network is highly dependent on the speed and accuracy of the hub …
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Improved return passages for multistage centrifugal compressors
This thesis presents a design concept for return passages in multistage centrifugal compressors. Flow in a baseline return passage is analyzed to identify loss sources that have substantial potential for reduction. For the geometry analyzed, it is found that mismatched incidence of the return vane, …
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Temperance Reform in the Cotton Kingdom
The study of antebellum reform movements has usually focused upon the North because the hub and the bulk of reform activity was located there, and because Southern states expressed opposition to what they branded as fanatical social ideas, most notably abolition. The prominence of abolition among …
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Propeller design and analysis for a small, autonomous UAV
… descent rate over a 3-hour mission duration. The entire propeller design process, from airfoil selection to final part generation in the computer-aided drafting program SolidWorks is described. QMIL and QPROP were the programs of choice for producing a propeller design focused on yielding …
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Uncovering Dynamic Semantic Networks in the Brain Using Novel Approaches for EEG/MEG Connectome Reconstruction
The current thesis addresses some of the unresolved predictions of recent models of the semantic brain system, such as the hub-and-spokes model. In particular, we tackle different aspects of the hypothesis that a widespread network of interacting heteromodal (hub(s)) and unimodal (spokes) cortices …
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A computational study of the 3D flow and performance of a vaned radial diffuser
… was performed on a vaned radial diffuser using the MEFP (The Moore Elliptic Flow Program) flow code. The vaned diffuser studied by Dalbert et al. was chosen as a test case for this thesis. The geometry and inlet conditions were established from this study. The performance of the computational …
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Network Growth and Efficiency
The existing network literature has not been widely applied in international relations. Of primary interest to the international system is how network growth affects efficiency. Knowledge of efficient edges can guide how countries interact within a given network by maintaining only the most …
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Mechanisms of binding diversity in protein disorder : molecular recognition features mediating protein interaction networks
… involved in protein interactions, but also have the capability to associate with more than one partner. Short disordered protein fragments, called “molecular recognition features” (MoRFs), were hypothesized to facilitate the binding diversity of highly-connected proteins termed “hubs”. MoRFs …
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Hub and Axis
The project is for the central building of a community center used by the communities of Blacksburg and Christiansburg. The building is a space configured as a hub that uses axes to determine entering, exiting and vertical movement. The hub configuration of the building is in concentric rings …
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