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Dissertations / Theses on the topic 'Spherical Erro'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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1

Pelland, Patrick. "Automated Error Assessment in Spherical Near-Field Antenna Measurements." Thèse, Université d'Ottawa / University of Ottawa, 2011. http://hdl.handle.net/10393/20035.

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This thesis will focus on spherical near-field antenna measurements and the methods developed or modified for the work of this thesis to estimate the uncertainty in a particular far-field radiation pattern. We will discuss the need for error assessment in spherical near-field antenna measurements. A procedure will be proposed that, in an automated fashion, can be used to determine the overall uncertainty in the measured far-field radiation pattern of a particular antenna. This overall uncertainty will be the result of a combination of several known sources of error common to SNF measurements.

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2

Lehman, Joseph Christian. "Sphero-cylindrical Refraction with Spherical Lenses." The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1587510615809807.

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3

Apel, Thomas, and Cornelia Pester. "Clément-type interpolation on spherical domains - interpolation error estimates and application to a posteriori error estimation." Universitätsbibliothek Chemnitz, 2006. http://nbn-resolving.de/urn:nbn:de:swb:ch1-200601335.

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In this paper, a mixed boundary value problem for the Laplace-Beltrami operator is considered for spherical domains in $R^3$, i.e. for domains on the unit sphere. These domains are parametrized by spherical coordinates (\varphi, \theta), such that functions on the unit sphere are considered as functions in these coordinates. Careful investigation leads to the introduction of a proper finite element space corresponding to an isotropic triangulation of the underlying domain on the unit sphere. Error estimates are proven for a Clément-type interpolation operator, where appropriate, we

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4

Park, HyeongKae. "Coupled Space-Angle Adaptivity and Goal-Oriented Error Control for Radiation Transport Calculations." Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/13944.

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This research is concerned with the self-adaptive numerical solution of the neutral particle radiation transport problem. Radiation transport is an extremely challenging computational problem since the governing equation is seven-dimensional (3 in space, 2 in direction, 1 in energy, and 1 in time) with a high degree of coupling between these variables. If not careful, this relatively large number of independent variables when discretized can potentially lead to sets of linear equations of intractable size. Though parallel computing has allowed the solution of very large problems, available com

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5

Liang, Ying, and 梁瑩. "A study on low complexity near-maximum likelihood spherical MIMO decoders." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2010. http://hub.hku.hk/bib/B43703987.

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6

Liang, Ying. "A study on low complexity near-maximum likelihood spherical MIMO decoders." Click to view the E-thesis via HKUTO, 2010. http://sunzi.lib.hku.hk/hkuto/record/B43703987.

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7

Bao, Wentao. "A Simulation and Optimization Study of Spherical Perfectly Matched Layers." The Ohio State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=osu1494166698903702.

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8

Graham, Nicholas Dale. "The Heritability of Refractive Error between Siblings." The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1275350173.

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9

Pester, Cornelia. "A residual a posteriori error estimator for the eigenvalue problem for the Laplace-Beltrami operator." Universitätsbibliothek Chemnitz, 2006. http://nbn-resolving.de/urn:nbn:de:swb:ch1-200601556.

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The Laplace-Beltrami operator corresponds to the Laplace operator on curved surfaces. In this paper, we consider an eigenvalue problem for the Laplace-Beltrami operator on subdomains of the unit sphere in $\R^3$. We develop a residual a posteriori error estimator for the eigenpairs and derive a reliable estimate for the eigenvalues. A global parametrization of the spherical domains and a carefully chosen finite element discretization allows us to use an approach similar to the one for the two-dimensional case. In order to assure results in the quality of those for plane domains, weighted norms

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10

Wang, Daodang, Zhichao Wang, Rongguang Liang, et al. "Fast searching measurement of absolute displacement based on submicron-aperture fiber point-diffraction interferometer." SPIE-INT SOC OPTICAL ENGINEERING, 2017. http://hdl.handle.net/10150/625741.

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The submicron-aperture fiber point-diffraction interferometer (SFPDI) can be applied to realize the measurement of three-dimensional absolute displacement within large range, in which the performance of point-diffraction wavefront and numerical iterative algorithm for displacement reconstruction determines the achievable measurement accuracy, reliability and efficiency of the system. A method based on fast searching particle swarm optimization (FS-PSO) algorithm is proposed to realize the rapid measurement of three-dimensional absolute displacement. Based on the SFPDI with two submicron-apertu

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11

Frederic, John. "Examination of Initialization Techniques for Nonnegative Matrix Factorization." Digital Archive @ GSU, 2008. http://digitalarchive.gsu.edu/math_theses/63.

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While much research has been done regarding different Nonnegative Matrix Factorization (NMF) algorithms, less time has been spent looking at initialization techniques. In this thesis, four different initializations are considered. After a brief discussion of NMF, the four initializations are described and each one is independently examined, followed by a comparison of the techniques. Next, each initialization's performance is investigated with respect to the changes in the size of the data set. Finally, a method by which smaller data sets may be used to determine how to treat larger data sets

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12

Bomfim, Everton Pereira. "O uso dos dados da missão GOCE para a caracterização e a investigação das implicações na estrutura de densidade das Bacias Sedimentares do Amazonas e Solimões, Brasil." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/14/14132/tde-21062013-003455/.

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A maneira mais direta de detectar as anomalias da densidade é pelo estudo do potencial gravitacional e de suas derivadas. A disponibilidade global e a boa resolução dos dados do satélite GOCE, aliadas à disponibilidade de dados de gravimetria terrestre, são ideais para a comparação e classificação das bacias de larga escala, como as bacias sedimentares do Solimões e do Amazonas dentro do Craton amazônico. Foram processados um conjunto de dados, produtos GOCE EGG_TRF_2 Level 2, ao longo das trajetórias do satélite para remover o ruído (shift/drift) nos gradientes da gravidade a partir da técnic

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13

Janakiraman, Balasubramanian. "Mechanical property measurement by indentation techniques." Texas A&M University, 2004. http://hdl.handle.net/1969.1/3111.

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The mechanical properties of materials are usually evaluated by performing a tensile or hardness test on the sample. Tensile tests are often time consuming, destructive and need specially prepared specimens. On the other hand, there is no direct theoretical correlation between the hardness number and the mechanical properties of a material although phenomenological relationships do exist. The advantages of indentation techniques are that they are non-destructive, quick, and can be applied to small material samples and localized in fashion. Mechanical properties are typically determined from sp

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14

Shafer, Benjamin M. "Error Sensor Placement for Active Control of an Axial Cooling Fan." BYU ScholarsArchive, 2007. https://scholarsarchive.byu.edu/etd/1205.

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Recent experimental achievements in active noise control (ANC) for cooling fans have used near-field error sensors whose locations are determined according to a theoretical condition of minimized sound power. A theoretical point source model, based on the condition previously stated, reveals the location of near-field pressure nulls that may be used to optimize error sensor placement. The actual locations of these near-field pressure nulls for both an axial cooling fan and a monopole loudspeaker were measured over a two-dimensional grid with a linear array of microphones. The achieved global a

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15

Gräf, Manuel. "Efficient Algorithms for the Computation of Optimal Quadrature Points on Riemannian Manifolds." Doctoral thesis, Universitätsbibliothek Chemnitz, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-115287.

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We consider the problem of numerical integration, where one aims to approximate an integral of a given continuous function from the function values at given sampling points, also known as quadrature points. A useful framework for such an approximation process is provided by the theory of reproducing kernel Hilbert spaces and the concept of the worst case quadrature error. However, the computation of optimal quadrature points, which minimize the worst case quadrature error, is in general a challenging task and requires efficient algorithms, in particular for large numbers of points. The focus

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16

Чирков, Д. А., та D. A. Chirkov. "Автоматизация контроля и сортировки бомбинированных подшипниковых роликов по биению сферического торца : магистерская диссертация". Master's thesis, б. и, 2019. http://hdl.handle.net/10995/74340.

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Цель работы – разработка, исследование точности и конструирование измерительной станции для контроля биения сферического торца ролика радиального двухрядного сферического подшипника качения на базе существующего автомата (А-2292-М) для контроля гранности бочкообразных роликов. В ходе работы была предложена метрологическая схема, необходимая для контроля сферического торца ролика, исследована её точность, разработана конструкция измерительной станции. Показана реализация измерительной системы в конструкции автомата для контроля гранности с двумя вариантами источников вращения ролика в процессе

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17

Lu, Yi-Ting, and 盧怡廷. "A Study of Error Compensation for Laser Displacement Sensor by Spherical Error Model." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/06350433342279823854.

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碩士<br>國立中興大學<br>機械工程學系<br>93<br>This paper proposes a novel technique of laser displacement probe alignment with the coordinate measuring machine (CMM). Measuring a pyramid artifact that resides at a specific location with the touch trigger probe and the laser displacement probe, the position and the orientation of the probe is calibrated by using the proposed techniques. When laser displacement probe is used for profile measurement, the accuracy will be seriously affected by the gradient of the surface of an object. This paper presents a spherical error model to account for them. The paramete

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18

Cox, Michael J., and Holger H. Dietze. "Correcting ocular spherical aberration with soft contact lenses." 2004. http://hdl.handle.net/10454/3471.

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No<br>Following aberroscopy, aspheric front surface soft contact lenses (SCLs) were custom-made to correct spherical refractive error and ocular spherical aberration (SA) of 18 myopic and five hypermetropic subjects (age, 20.5 . 5 yr). On-eye residual aberrations, logMAR visual acuity, and contrast sensitivity were compared with the best-correcting spectacle lens, an equally powered standard SCL, and an SCL designed to be aberration free in air. Custom-made and spherical SCLs reduced SA ( p . 0.001; p . 0.05) but did not change total root-meansquare (rms) wave-front aberration (WFA).

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