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You searched for +publisher:"Texas A&M University" +contributor:("Ingole, Sudeep"). Showing records 1 – 2 of 2 total matches.

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Texas A&M University

1. Ginter, Carly C. Comparative Analysis of the Morphology and Materials Properties of Pinniped Vibrissae.

Degree: MS, Wildlife and Fisheries Sciences, 2012, Texas A&M University

Vibrissae (whiskers) are important components of the mammalian tactile sensory system, and primarily function as detectors of environmental vibrotactile cues. Pinnipeds possess the largest and most highly innervated vibrissae among mammals and their vibrissae demonstrate a diversity of shapes and likely mechanical properties. These two characteristics are important for vibrotactile sensory perception. Vibrissae of most phocid seals exhibit a beaded morphology with repeated sequences of crests and troughs along their length. I comparatively characterized differences in vibrissae morphologies among phocid species with a beaded profile, phocid species with a smooth profile, and otariids with a smooth profile using traditional and geometric morphometric methods to test the hypothesis that vibrissal morphologies are species-specific manipulations of a common pattern. The traditional and geometric morphometric datasets were subsequently combined by mathematically scaling each to true rank, followed by a single eigendecomposition. Quadratic discriminant function analysis demonstrated that 79.3, 97.8 and 100% of individuals could be correctly classified to taxon based on vibrissal shape variables in the traditional, geometric and combined morphometric analyses, respectively. At least three separate morphologies were identified since phocids with beaded vibrissae, phocids with smooth vibrissae, and otariids each occupied distinct morphospace in the geometric morphometric and combined data analyses. Another important characteristic that influences the transduction of vibrotactile information to the mechanoreceptors in the follicle-sinus complex is the materials properties of the vibrissae. Vibrissae were modeled as cantilever beams and flexural stiffness (EI) was measured to test the hypotheses that the shape of beaded vibrissae reduces flexural stiffness and that vibrissae are anisotropic (orientations differ in EI). Species were significantly different and smooth vibrissae were generally stiffer than beaded vibrissae. Beaded vibrissae decrease vibrations in flow, which, combined with lower flexural stiffness values, may enhance detection of small changes in flow from swimming prey. The anterior plane of the vibrissae is likely the most biologically significant in tracking hydrodynamic trails but had lower flexural stiffness values than the dorsoventral orientation. There is likely a complex interaction between shape and mechanical properties in pinniped vibrissae but the ecological and functional implications are currently unknown. Advisors/Committee Members: Marshall, Christopher D. (advisor), DeWitt, Thomas J. (committee member), Ingole, Sudeep (committee member).

Subjects/Keywords: whiskers; seals; sea lions; morphology; flexural stiffness

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

APA (6th Edition):

Ginter, C. C. (2012). Comparative Analysis of the Morphology and Materials Properties of Pinniped Vibrissae. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2011-12-10491

Chicago Manual of Style (16th Edition):

Ginter, Carly C. “Comparative Analysis of the Morphology and Materials Properties of Pinniped Vibrissae.” 2012. Masters Thesis, Texas A&M University. Accessed April 22, 2021. http://hdl.handle.net/1969.1/ETD-TAMU-2011-12-10491.

MLA Handbook (7th Edition):

Ginter, Carly C. “Comparative Analysis of the Morphology and Materials Properties of Pinniped Vibrissae.” 2012. Web. 22 Apr 2021.

Vancouver:

Ginter CC. Comparative Analysis of the Morphology and Materials Properties of Pinniped Vibrissae. [Internet] [Masters thesis]. Texas A&M University; 2012. [cited 2021 Apr 22]. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2011-12-10491.

Council of Science Editors:

Ginter CC. Comparative Analysis of the Morphology and Materials Properties of Pinniped Vibrissae. [Masters Thesis]. Texas A&M University; 2012. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2011-12-10491

2. Paluri, Rajeshwari S. Lakshmi. Development and Characterization of Novel Alumina Based Ceramic Matrix Composites for Energy Efficient Sliding Applications.

Degree: MS, Mechanical Engineering, 2012, Texas A&M University

Friction, wear, and lubrication have direct influence on performance, reliability, and service life of mechanical systems with moving components. The useful life of these systems and their efficiency can be improved by improving the surface properties/ performance at sliding interfaces. Further, the usage of materials for sliding systems is limited in extreme environments, such as high temperature, and space, etc., due to their limited surface properties. This thesis focuses on the development of a new class of composites with superior surface properties, i.e., low friction and high wear resistance for extreme environmental conditions. Alumina, a well understood material for its tribological performance, is a merit choice for applications where high wear resistance is required, such as pump bearings, seal rings, valve seats, piston components, gears, cutting tool inserts and artificial joints. We propose to develop a novel alumina based ceramic composite to enhance its surface and tribological properties using a powder compaction technique. The newly developed composites will be characterized by X-ray Diffraction (XRD), Fourier Transform Infrared spectroscope (FTIR), Optical microscope, Environmental Scanning Electron Microscope (E-SEM), Goniometer and Surface profilometer. In-situ formation of high temperature stable phases, effect of sintering temperature, and percentage of reinforcement on phase formation will be studied. Investigation of effect of sintering temperature and percentage of reinforcement on density, porosity, and grain size will be conducted. The composites will be characterized for their tribological properties (friction and wear). The mechanisms for modified friction and wear will be proposed. The process parameters and compositions will be optimized. XRD results confirmed the formation of Al18B4O33, and AlB2 and FTIR confirmed the presence of B2O3. Increase in sintering temperature and wt % of boron affected the porosity, grain size, and hardness of the composites. The coefficient of friction was lower for the composites compared to pure alumina ceramic. The coefficient of friction decreased with increase in sintering temperature. The wear mechanism was found to be micro-fracture using ESEM and SEM studies. Advisors/Committee Members: Ingole, Sudeep (advisor), Liang, Hong (advisor), Fang, Alex (committee member).

Subjects/Keywords: Friction; Wear; Alumina; Ceramics

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

APA (6th Edition):

Paluri, R. S. L. (2012). Development and Characterization of Novel Alumina Based Ceramic Matrix Composites for Energy Efficient Sliding Applications. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2011-08-10073

Chicago Manual of Style (16th Edition):

Paluri, Rajeshwari S Lakshmi. “Development and Characterization of Novel Alumina Based Ceramic Matrix Composites for Energy Efficient Sliding Applications.” 2012. Masters Thesis, Texas A&M University. Accessed April 22, 2021. http://hdl.handle.net/1969.1/ETD-TAMU-2011-08-10073.

MLA Handbook (7th Edition):

Paluri, Rajeshwari S Lakshmi. “Development and Characterization of Novel Alumina Based Ceramic Matrix Composites for Energy Efficient Sliding Applications.” 2012. Web. 22 Apr 2021.

Vancouver:

Paluri RSL. Development and Characterization of Novel Alumina Based Ceramic Matrix Composites for Energy Efficient Sliding Applications. [Internet] [Masters thesis]. Texas A&M University; 2012. [cited 2021 Apr 22]. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2011-08-10073.

Council of Science Editors:

Paluri RSL. Development and Characterization of Novel Alumina Based Ceramic Matrix Composites for Energy Efficient Sliding Applications. [Masters Thesis]. Texas A&M University; 2012. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2011-08-10073

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