subject:(Coast down)

Oregon State University

1. Motley, Jennifer. Local and Regional Patterns in Eelgrass (Zostera marina L.) Communities Along an Upwelling-Productivity Gradient in Oregon Estuaries, USA.

Degree: MS, 2017, Oregon State University

URL: http://hdl.handle.net/1957/61713

► In this thesis, I investigate the organization of eelgrass (Zostera marina L.) and mesograzer communities across local and regional scales in three upwelling- influenced estuaries… (more)

▼ In this thesis, I investigate the organization of eelgrass (Zostera marina L.) and mesograzer communities across local and regional scales in three upwelling- influenced estuaries located along the Oregon coast, USA. Eelgrass ecosystems are an important source of primary production in estuarine systems, providing numerous ecosystem services, including nursery habitat for commercial fish, water quality improvement, and sediment stabilization. Community structure in eelgrass systems, i.e., the diversity, abundance, and composition of primary and secondary consumers, is influenced by a combination of local to regional scale variability in environmental and biotic factors. Thus, an important consideration in the management of these systems is to understand the organization of community structure across spatiotemporal scale and the implications for top-down (consumer) versus bottom-up (resource) control. In upwelling-influenced estuaries of the Pacific Northwest coast of the United States, eelgrass systems are exposed to latitudinal variability in oceanographic inputs, but the degree to which these regional effects versus local effects organize eelgrass community structure is poorly understood. Here I investigate the relationship between primary producers (eelgrass, ulvoid macroalgae, and epiphytes), epifauna mesograzers, and fish predators within and across three estuaries located on the Oregon Coast, USA (Netarts Bay, Yaquina Bay, and Coos Bay). Specifically, I asked: 1) What is the relative importance of local (within estuary) versus regional (across estuaries) scale patterns to eelgrass community structure (i.e., primary producers, epifaunal mesograzers, and fishes) in upwelling-influenced estuaries in Oregon?, 2) What is the potential role of regional oceanography versus trophic interactions in regulating eelgrass community structure, and is this dependent on spatial scale?, and 3) What are the management implications for eelgrass communities when regional and local scales are considered? I found that while local effects were important, regional (estuary) scale patterns strongly influenced community structure in eelgrass communities, providing support that regional oceanographic bottom-up forcing dominates eelgrass communities. Additionally, I found evidence for top-down control by the opisthobranch Phyllaplysia taylori on primary producers at one site within Netarts Bay. I suggest that eelgrass beds in these estuaries are mostly bottom-up systems, and further investigations should focus on quantifying the mechanistic relationship between mesograzers and primary producers at local to regional scales. Advisors/Committee Members: Tomas Nash, Fiona (advisor), Dewitt, Ted (committee member).

Subjects/Keywords: seagrass; ulvoid macroalgae; epiphytes; epifaunal mesograzer; fish; trophic cascade; top-down; bottom-up; context-dependent; Phyllaplysia taylori; California Current System; Netarts Bay; Yaquina Bay; Coos Bay; Oregon; Pacific Northwest coast

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APA (6^th Edition):

Motley, J. (2017). Local and Regional Patterns in Eelgrass (Zostera marina L.) Communities Along an Upwelling-Productivity Gradient in Oregon Estuaries, USA. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/61713

Chicago Manual of Style (16^th Edition):

Motley, Jennifer. “Local and Regional Patterns in Eelgrass (Zostera marina L.) Communities Along an Upwelling-Productivity Gradient in Oregon Estuaries, USA.” 2017. Masters Thesis, Oregon State University. Accessed March 05, 2021. http://hdl.handle.net/1957/61713.

MLA Handbook (7^th Edition):

Motley, Jennifer. “Local and Regional Patterns in Eelgrass (Zostera marina L.) Communities Along an Upwelling-Productivity Gradient in Oregon Estuaries, USA.” 2017. Web. 05 Mar 2021.

Vancouver:

Motley J. Local and Regional Patterns in Eelgrass (Zostera marina L.) Communities Along an Upwelling-Productivity Gradient in Oregon Estuaries, USA. [Internet] [Masters thesis]. Oregon State University; 2017. [cited 2021 Mar 05]. Available from: http://hdl.handle.net/1957/61713.

Council of Science Editors:

Motley J. Local and Regional Patterns in Eelgrass (Zostera marina L.) Communities Along an Upwelling-Productivity Gradient in Oregon Estuaries, USA. [Masters Thesis]. Oregon State University; 2017. Available from: http://hdl.handle.net/1957/61713

University of Windsor

2. Jiang, Xian Jian. Real Time Predictive Speed Analysis for High Speed Rail Collision Test.

Degree: MS, Computer Science, 2015, University of Windsor

URL: https://scholar.uwindsor.ca/etd/5441

► In a real train collision test, a train locomotive needs to be propelled on a straight, guided path, to a particular speed, at which… (more)

Subjects/Keywords: coast down; collision test; crash speed; force release; release location; release speed

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APA (6^th Edition):

Jiang, X. J. (2015). Real Time Predictive Speed Analysis for High Speed Rail Collision Test. (Masters Thesis). University of Windsor. Retrieved from https://scholar.uwindsor.ca/etd/5441

Chicago Manual of Style (16^th Edition):

Jiang, Xian Jian. “Real Time Predictive Speed Analysis for High Speed Rail Collision Test.” 2015. Masters Thesis, University of Windsor. Accessed March 05, 2021. https://scholar.uwindsor.ca/etd/5441.

MLA Handbook (7^th Edition):

Jiang, Xian Jian. “Real Time Predictive Speed Analysis for High Speed Rail Collision Test.” 2015. Web. 05 Mar 2021.

Vancouver:

Jiang XJ. Real Time Predictive Speed Analysis for High Speed Rail Collision Test. [Internet] [Masters thesis]. University of Windsor; 2015. [cited 2021 Mar 05]. Available from: https://scholar.uwindsor.ca/etd/5441.

Council of Science Editors:

Jiang XJ. Real Time Predictive Speed Analysis for High Speed Rail Collision Test. [Masters Thesis]. University of Windsor; 2015. Available from: https://scholar.uwindsor.ca/etd/5441

University of Kansas

3. Weingart, Robert. On-Track Testing as a Validation Method of Computational Fluid Dynamic Simulations of a Formula SAE Vehicle.

Degree: M.E., Mechanical Engineering, 2015, University of Kansas

URL: http://hdl.handle.net/1808/19383

► This thesis is about the validation of a computational fluid dynamics simulation of a ground vehicle by means of a low-budget coast-down test. The vehicle… (more)

Subjects/Keywords: Mechanical engineering; Aerospace engineering; Analysis; CFD-Simulation; Coast-Down Test; External Aerodynamics; FSAE; Validation

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APA (6^th Edition):

Weingart, R. (2015). On-Track Testing as a Validation Method of Computational Fluid Dynamic Simulations of a Formula SAE Vehicle. (Masters Thesis). University of Kansas. Retrieved from http://hdl.handle.net/1808/19383

Chicago Manual of Style (16^th Edition):

Weingart, Robert. “On-Track Testing as a Validation Method of Computational Fluid Dynamic Simulations of a Formula SAE Vehicle.” 2015. Masters Thesis, University of Kansas. Accessed March 05, 2021. http://hdl.handle.net/1808/19383.

MLA Handbook (7^th Edition):

Weingart, Robert. “On-Track Testing as a Validation Method of Computational Fluid Dynamic Simulations of a Formula SAE Vehicle.” 2015. Web. 05 Mar 2021.

Vancouver:

Weingart R. On-Track Testing as a Validation Method of Computational Fluid Dynamic Simulations of a Formula SAE Vehicle. [Internet] [Masters thesis]. University of Kansas; 2015. [cited 2021 Mar 05]. Available from: http://hdl.handle.net/1808/19383.

Council of Science Editors:

Weingart R. On-Track Testing as a Validation Method of Computational Fluid Dynamic Simulations of a Formula SAE Vehicle. [Masters Thesis]. University of Kansas; 2015. Available from: http://hdl.handle.net/1808/19383

4. Sim, Kyu-Ho. Rotordynamic and thermal analyses of compliant flexure pivot tilting pad gas bearings.

Degree: PhD, Mechanical Engineering, 2009, Texas A&M University

URL: http://hdl.handle.net/1969.1/ETD-TAMU-1575

► Rotordynamic and thermal analyses of compliant flexure pivot tilting pad gas bearings were performed. First, compliant flexure pivot tilting pad gas bearings with pad radial… (more)

▼ Rotordynamic and thermal analyses of compliant flexure pivot tilting pad gas bearings were performed. First, compliant flexure pivot tilting pad gas bearings with pad radial compliance (CFTPBs) were introduced and designed for high-speed oil-free micro turbomachinery. The pad radial compliance was for accommodation of large rotor growth at high speeds. Parametric studies on pivot offset, preload, and tilting stiffness were performed using non-linear orbit simulations and coast-down simulations for an optimum design. Second, coast-down tests for imbalance response and stability of typical rotor-bearing system with a rigid rotor and two CFTPBs designed from the above design studies were conducted over operating speeds up to 55 krpm. Prediction of synchronous rotordynamic responses was made in terms of critical speed for various imbalance modes by using a rotordynamic analysis software (XLTRC), combined with dynamic force coefficients from the perturbation analysis. For stability analyses, a generalized orbit simulation program was developed considering both the translational and angular rotor motions with two different bearings. Linear stability analyses for the conical vibration mode were also performed by using XLTRC and the perturbation analysis based on the Lund method. Predictions of whirl speed showed good agreement to the tests, but the estimated onset speed of instability appeared lower than the measured instability. Finally, a new thermo-hydrodynamic analysis model of a typical rotor-bearing system with CFTPBs was presented, accompanying linear perturbation analyses to investigate thermal effects on the rotordynamic performance. A numerical procedure was established for solving the generalized Reynolds equation, the 3-D energy equation, and the associated boundary conditions at the pad inlet flow and solid walls (rotor and pad) simultaneously. Parametric studies were conducted on nominal clearance and external load. Nominal clearance showed significant influence on temperature fields, and external load had uneven thermal effects among pads. Case studies with heat flux and temperature boundary conditions on the rotor end surface were performed to simulate various working conditions of the bearing. Large rotor thermal growth due to the high rotor temperature showed noticeable influence on rotordynamic performance by increasing direct stiffness and damping coefficients. Advisors/Committee Members: Kim, Daejong (advisor), Hung, Wayne N.P. (committee member), Morrison, Gerald L. (committee member), Palazzolo, Alan B. (committee member).

Subjects/Keywords: gas bearings; tilting pad bearings; perturbation analysis; orbit simulation; thermohydrodynamic analysis; rotordynamic analysis; stability analysis; coast-down test

…4.3.2 Imbalance Coast-down Test… …52 4.4.1 Stability Coast-down Test… …40 4.2 Nominal clearance and split offset of Bearing Set I for imbalance coast-down tests… …52 4.5 Nominal clearance and split offset of Bearing Set II for stability coast-down… …26 3.7 Coast down simulations of peak-to-peak amplitudes of εX with respect to pad radial…

10 more images…

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Sim, K. (2009). Rotordynamic and thermal analyses of compliant flexure pivot tilting pad gas bearings. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-1575

Chicago Manual of Style (16^th Edition):

Sim, Kyu-Ho. “Rotordynamic and thermal analyses of compliant flexure pivot tilting pad gas bearings.” 2009. Doctoral Dissertation, Texas A&M University. Accessed March 05, 2021. http://hdl.handle.net/1969.1/ETD-TAMU-1575.

MLA Handbook (7^th Edition):

Sim, Kyu-Ho. “Rotordynamic and thermal analyses of compliant flexure pivot tilting pad gas bearings.” 2009. Web. 05 Mar 2021.

Vancouver:

Sim K. Rotordynamic and thermal analyses of compliant flexure pivot tilting pad gas bearings. [Internet] [Doctoral dissertation]. Texas A&M University; 2009. [cited 2021 Mar 05]. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1575.

Council of Science Editors:

Sim K. Rotordynamic and thermal analyses of compliant flexure pivot tilting pad gas bearings. [Doctoral Dissertation]. Texas A&M University; 2009. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1575

University of Texas – Austin

5. Ates, Murat, 1982-. Fuel economy modeling of light-duty and heavy-duty vehicles, and coastdown study.

Degree: MSin Engineering, Mechanical Engineering, 2009, University of Texas – Austin

URL: http://hdl.handle.net/2152/ETD-UT-2009-05-80

► Development of a fuel economy model for light-duty and heavy-duty vehicles is part of the Texas Department of Transportation’s “Estimating Texas Motor Vehicle Operating Costs”… (more)

▼ Development of a fuel economy model for light-duty and heavy-duty vehicles is part of the Texas Department of Transportation’s “Estimating Texas Motor Vehicle Operating Costs” project. A literature review for models that could be used to predict the fuel economy of light-duty and heavy-duty vehicles resulted in selection of coastdown coefficients to simulate the combined effects of aerodynamic drag and tire rolling resistance. For light-duty vehicles, advantage can be taken of the modeling data provided by the United States Environmental Protection Agency (EPA) for adjusting chassis dynamometers to allow accurate determination of emissions and fuel economy so that compliance with emissions standards and Corporate Average Fuel Economy (CAFE) regulations can be assessed. Initially, EPA provided vehicle-specific data that were relevant to a physics-based model of the forces at the tire-road interface. Due to some limitations of these model parameters, EPA now provides three vehicle-specific coefficients obtained from vehicle coastdown data. These coefficients can be related back to the original physics-based model of the forces at the tire-road interface, but not in a manner that allows the original modeling parameters to be extracted from the coastdown coefficients. Nevertheless, as long as the operation of a light-duty vehicle does not involve extreme acceleration or deceleration transients, the coefficients available from the EPA can be used to accurately predict fuel economy. Manufacturers of heavy-duty vehicles are not required to meet any sort of CAFE standards, and the engines used in heavy-duty vehicles, rather than the vehicles themselves, are tested (using an engine dynamometer) to determine compliance with emissions standards. Therefore, EPA provides no data that could be useful for predicting the fuel economy of heavy-duty vehicles. Therefore, it is necessary to perform heavyduty coastdown tests in order to predict fuel economy, and use these tests to develop vehicle-specific coefficients for the force at the tire-road interface. Given these coefficients, the fuel economy of a heavy-duty vehicle can be calculated for any driving schedule. The heavy-duty vehicle model developed for this project is limited to pre-2007 calendar year heavy-duty vehicles due to the adverse effects of emissions components that were necessary to comply with emissions standards that went into effect January 2007. Advisors/Committee Members: Matthews, Ronald D. (advisor), Hall, Matthew J. (committee member).

Subjects/Keywords: Fuel Economy; Fuel Economy Modeling; Light-Duty; Heavy-Duty; Automotive; Vehicle; Coastdown; Coast-down; AVL ADVISOR; AVL CRUISE; AVL BOOST

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APA (6^th Edition):

Ates, Murat, 1. (2009). Fuel economy modeling of light-duty and heavy-duty vehicles, and coastdown study. (Masters Thesis). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/ETD-UT-2009-05-80

Chicago Manual of Style (16^th Edition):

Ates, Murat, 1982-. “Fuel economy modeling of light-duty and heavy-duty vehicles, and coastdown study.” 2009. Masters Thesis, University of Texas – Austin. Accessed March 05, 2021. http://hdl.handle.net/2152/ETD-UT-2009-05-80.

MLA Handbook (7^th Edition):

Ates, Murat, 1982-. “Fuel economy modeling of light-duty and heavy-duty vehicles, and coastdown study.” 2009. Web. 05 Mar 2021.

Vancouver:

Ates, Murat 1. Fuel economy modeling of light-duty and heavy-duty vehicles, and coastdown study. [Internet] [Masters thesis]. University of Texas – Austin; 2009. [cited 2021 Mar 05]. Available from: http://hdl.handle.net/2152/ETD-UT-2009-05-80.

Council of Science Editors:

Ates, Murat 1. Fuel economy modeling of light-duty and heavy-duty vehicles, and coastdown study. [Masters Thesis]. University of Texas – Austin; 2009. Available from: http://hdl.handle.net/2152/ETD-UT-2009-05-80

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