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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 170 for “"Taper"”.
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Obturation with gutta percha of greater taper
… canals obturated with Diadent DiaPro .04 and .06 taper gutta percha points.;Sixty eight canals of extracted human teeth were instrumented with ProFile Series 29, 0.06 taper rotary files. Canals were obturated as follows: (Group 1) cold lateral condensation using an ISO size master gutta percha …
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Fiber-taper collected photoluminescence characterization of diamond microdisks
… free space and visible wavelength fiber-taper measurement capabilities is built to characterize diamond microdisk resonators. Using this setup, microdisk wisphering gallery modes with quality factors at visible wavelengths resonant with defect centers as high as Q ∼ 1 × 105, are observed …
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Modeling Stem Taper of Southern Appalachian Red Spruce
… red spruce stands through regionally fitted stem taper equations and to examine differences in stem form between the northern and southern populations of red spruce. In Chapter 1, five stem taper equations were evaluated for their ability to predict upper stem diameters and total volume in …
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Methods for modeling whole stem diameter growth and taper
Stem profile models which allow for both taper and form changes (Gray 1956) were constructed and evaluated. Gray defined form to be the basic shape of the tree, e.g. cone or parabolid, and taper to be the rate of narrowing in diameter given a tree form. Ormerod's stem profile model was selected as …
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Compatible taper and volume equations for yellow-poplar in West Virginia
… products industry in West Virginia. Accurate taper and volume functions are an important component of most inventory systems for use in estimating upper stem diameter, form, and tree volume. Compatible taper and volume functions can be derived through the mathematical integration of taper …
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Volume and taper equations for loblolly pine trees using dimensional analysis
… derive a general volume equation for a tree. A taper equation compatible with the general volume equation was developed. Data from loblolly pine trees grown in natural stands in the Coastal Plain of North Carolina and the Coastal Plain and Piedmont areas of Virginia were used to estimate the …
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Sweep and Taper Analysis of Surfboard Fins Using Computational Fluid Dynamics
… and flow field. This was done by isolating the taper and sweep distribution of a baseline geometry and varying each parameter individually whilst maintaining a constant span and surface area. The baseline surfboard fin was used as a template in Matlab to generate a set of x and y coordinates …
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Developing a Taper Model for Pinus elliottii x caribaea in South Africa
Various taper functions have been developed to determine the log class distributions of trees more accurately. The need for several taper models is due to the variability in stem form and taper between tree species and even within species. Therefore, although a lot of studies have been done with …
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Development of a taper equation for Pinus oocarpa Schiede in natural stands of central Honduras
Nine taper equations were tested to predict diameters inside bark along the stem for <i>Pinus oocarpa</i> Schiede trees growing in natural stands of central Honduras. A five parameter submodel predicted as well as an eight parameter model proposed by Kozak, 1988. Taper variation was explored …
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Driver's comfort level in construction zones with reduced transition taper length: case study for Pakistani conditions
… at analysis of comfort level with reduction in taper length in Pakistani WZ conditions. A web based survey was conducted with 108 participants to assess drivers’ comfort level if taper length is reduced on motorways and highways by 0%, 10%, 29%, 30% and 40%. It focused on people having driving …
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K3 Endo, Pro Taper, and Pro File Systems: Breakage and Distortion in Severely Curved Roots of Molars
K3 ENDO, PRO TAPER, AND PRO FILE SYSTEMS: BREAKAGE AND DISTORTION IN SEVERELY CURVED ROOTS OF MOLARS.By Matthew T. Ankrum, D.D.S.A Thesis submitted in partial fulfillment of the requirements for the degree of Master of Science at Virginia Commonwealth University.Virginia Commonwealth University, …
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Design, Material and Surgical Assembly Effects on Fretting Corrosion Behavior of Modular Tapers in Orthopedic Implants
… in modular devices with metal-on-metal (MoM) tapered interfaces. Oxide film abrasion, leading to fretting corrosion in the presence of a crevice, accelerates the corrosion process and in some instances may lead to failure of the implant. Failure is defined as the need for revision surgery. The …
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Novel Methods and Self-Reinforced Composite Materials for Assessment and Prevention of Fretting Corrosion in Modular Tapers
… and micromechanical performance of modular tapers were evaluated, and self-reinforced composite materials were developed for their potential to prevent the onset of mechanically assisted corrosion in modular taper devices.</p> <p>A study of the seating and taper locking mechanics of modular …
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Prediction of cubic-foot volume of loblolly pine to any top diameter limit and to any point on tree bole
… give the ratios of merchantable to total volume. Taper equations when integrated provide volume estimates of any segment of the bole. Data from plantations and natural stands of loblolly pine were used to compare the models for ability to predict merchantable volumes. Additional evaluations were …
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Optical Sensors for High-Temperature Pressure Measurement and Real-Time Particle Detection
… real time. The sensor is based on a silica fiber taper, and we aim to detect particle presence by measuring optical scattering and absorption induced by particles attached to the taper surface. To establish the relationship between particle density and optical transmission loss, we first consider …
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Essays on Pension Policies and Temptation Preferences
… effect of introducing an adjustable (non-linear) taper rate to a means-tested public age pension. Unlike a linear taper rate, a non-linear taper rate can be adjusted without affecting eligibility for the pension. Both a progressive taper rate (that increases with income) and a regressive taper …
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Tapered Splice for Efficient Power Coupling to Small-Core Nonlinear Fibers
… butt-joint splice. This technique uses a highly tapered splice in which the field leaves the core and propagates as a fundamental cladding mode before it couples back to the core mode of the small core fiber. At the beginning of the taper the fundamental core mode carries most of the power. Over …
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Design and fabrication of efficient fiber to chip couplers
… optimization algorithm for designing adiabatic tapers and thinning of the waveguide over-cladding in the taper region. Several different coupler designs with optimized taper shapes have been fabricated and characterized with losses for some designs reduced below 1 dB.
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HIGH EFFICIENCY EDGE COUPLER, NOVEL NONLINEAR OPTICAL POLYMERS WITH LARGE KERR-COEFFICIENT AND AUTOMATIC LAYOUT GENERATION IN SILICON PHOTONICS
… this goal, loss mechanisms of basic inverse taper couplers are analyzed and experimentally verified. Then a cantilever-encapsulated inverse taper is demonstrated to further lower coupling loss compared to basic inverse tapers. Nonetheless, both couplers are designed to couple with lensed …
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A COMPUTATIONAL APPROACH TO FRETTING WEAR PREDICTION IN TOTAL HIP REPLACEMENTS
… suggests that fretting wear occurs at the taper junction of modular total hip replacements and leads to failure of the implants. Experimental testing to determine the wear behaviour that occurs in mechanical devices is time consuming, expensive and complicated. Computational wear modelling …
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