subject:(Planing Surface)

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1. Bay, Raymond James. Improved Design Method for Cambered Stepped Hulls with High Deadrise.

Degree: MS, Ocean Engineering, 2019, Virginia Tech

Eugene Clement developed a new design method to improve the performance of ultra-fast planing crafts. A planing craft uses the force generated from the flow of water over the bottom to lift the vessel without the use of the static buoyancy force that classic boat designs rely on. Clement wanted to improve the performance of the planing vessel by reducing the total drag force caused by the flow of water on the bottom of the vessel. ClementâĂŹs design method involves reducing the wetted surface area which reduces drag. Reducing the wetted surface area would normally cause the lifting force on the vessel to reduce, but with the addition of curvature in the smaller wetted surface area, the lifting force would remain the same. ClementâĂŹs new design method requires multiple iterations to obtain an optimal design. The method limits the angle of the vessels bottom relative to horizontal to under 15 degree. The goal of this thesis is to create a new design method for planing vessels with bottoms that have an incline of 15 degrees or more relative to horizontal. The design method is created using Computational Fluid Dynamics (CFD) solver to model the planing surface moving through water. The CFD solver is validated with experimental test performed at the United States Naval Academy. The improved design method uses equations that can predict the forces and other design characteristics based on the desired vessel weight and seakeeping requirements. Advisors/Committee Members: Brizzolara, Stefano (committeechair), Paterson, Eric G. (committee member), Brown, Alan J. (committee member).

Subjects/Keywords: CFD; Planing Surface; Cambered Step Hull

…List of Figures 1.1 Pressure Distribution on Flat Planing Surface [9]… …2 1.2 Waterlines on Planing Surface with Deadrise [9]… …3 1.4 Deadrise Angle versus Trim Angle for Cambered Planing Surface [4]… …Varying Deadrise Angle β for Prismatic Planing Surface [4] . . . . . . . 5 1.6… …Points from Cambered Planing Surface Generator Code (Profile View) . . . . 56 3.2…

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APA (6^th Edition):

Bay, R. J. (2019). Improved Design Method for Cambered Stepped Hulls with High Deadrise. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/90298

Chicago Manual of Style (16^th Edition):

Bay, Raymond James. “Improved Design Method for Cambered Stepped Hulls with High Deadrise.” 2019. Masters Thesis, Virginia Tech. Accessed January 18, 2021. http://hdl.handle.net/10919/90298.

MLA Handbook (7^th Edition):

Bay, Raymond James. “Improved Design Method for Cambered Stepped Hulls with High Deadrise.” 2019. Web. 18 Jan 2021.

Vancouver:

Bay RJ. Improved Design Method for Cambered Stepped Hulls with High Deadrise. [Internet] [Masters thesis]. Virginia Tech; 2019. [cited 2021 Jan 18]. Available from: http://hdl.handle.net/10919/90298.

Council of Science Editors:

Bay RJ. Improved Design Method for Cambered Stepped Hulls with High Deadrise. [Masters Thesis]. Virginia Tech; 2019. Available from: http://hdl.handle.net/10919/90298

University of Otago

2. Safii, Syarida Hasnur. Manuka-Derived Products as an Adjunct to Scaling and Root Planing in the Treatment of Chronic Periodontitis .

Degree: University of Otago

URL: http://hdl.handle.net/10523/8513

Antibiotics and antiseptics are used as locally-delivered antimicrobial adjuncts in conjunction with scaling and root planing (SRP), mostly to treat non-responding and recurrent deep periodontal pockets. Adjunctive therapy is deemed necessary to support and optimise periodontal healing by eliminating or suppressing gram-negative bacteria associated with periodontal diseases. However, due to developing antibiotic resistance, alternative antimicrobials originating from plants have been considered. Bioactive substances from this source have potent antibacterial properties and wound healing potential. The research described in this thesis investigated the potential of manuka-derived products (manuka honey and manuka oil) as antimicrobials to be administered to periodontal pockets as an adjunct to SRP. In vitro and in vivo investigations were performed to answer the research questions related to this topic. Antibacterial activities of manuka-derived products were assessed. Clinical and microbiological outcomes following SRP and application of manuka honey were measured. Toxicology profile of manuka oil was determined using cell culture methods. A delivery device for the administration of manuka oil to periodontal pockets was developed. This device was assessed for antibacterial activity and penetration into a single-species biofilm. Manuka honey exhibited broad-spectrum antimicrobial activity against a variety of plaque-associated bacteria. The present in vitro investigation demonstrated that decreasing the concentration of honey not only reduced the antimicrobial activity but also promoted bacterial carbohydrate metabolism and consequent acid production by Streptocococcus mutans, further exacerbating demineralisation. Furthermore, manuka honey is slow-acting, thus limiting its efficacy in periodontal pockets due to significant dilution. The split-mouth clinical study of a three-month follow-up did not show additional improvement in clinical parameters when periodontal pockets were treated with manuka honey following SRP compared to SRP alone. In contrast, manuka oil showed encouraging potential as a therapeutic substance. When comparing the two manuka-derived products, manuka oil (effective concentration = 0.1% w/v) was more potent than manuka honey (effective concentrations ranged = 13-25% w/v). Manuka oil also showed a relatively rapid bactericidal effect. The toxicology profile of manuka oil based on half maximal inhibitory concentrations (IC50) determined at 96 hours was four times higher than the effective antimicrobial concentration, whereas the IC50 of chlorhexidine was 100 times higher than its therapeutic concentration. This investigation suggests that apoptosis rather than necrosis may be the mechanism of cell death induced by manuka oil under cell culture conditions. The compositions of a delivery device demonstrated favourable rheological properties, that is, pseudoplastic or shear thinning behaviour and increased elasticity with increasing frequencies which may improve retention in periodontal pockets.… Advisors/Committee Members: Duncan, Warwick (advisor).

Subjects/Keywords: manuka honey; manuka oil; root planing; root surface debridement; local antimicrobial; emulsion; adjunct; biofilm

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APA (6^th Edition):

Safii, S. H. (n.d.). Manuka-Derived Products as an Adjunct to Scaling and Root Planing in the Treatment of Chronic Periodontitis . (Doctoral Dissertation). University of Otago. Retrieved from http://hdl.handle.net/10523/8513