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Dissertations / Theses on the topic 'Elliptical holes'

Author: Grafiati

Published: 4 June 2021

Last updated: 7 February 2022

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1

Snyder, Gregory Frantz. "Modeling Spatially and Spectrally Resolved Observations to Diagnose the Formation of Elliptical Galaxies." Thesis, Harvard University, 2013. http://dissertations.umi.com/gsas.harvard:10893.

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In extragalactic astronomy, a central challenge is that we cannot directly watch what happens to galaxies before and after they are observed. This dissertation focuses on linking predictions of galaxy time-evolution directly with observations, evaluating how interactions, mergers, and other processes affect the appearance of elliptical galaxies. The primary approach is to combine hydrodynamical simulations of galaxy formation, including all major components, with dust radiative transfer to predict their observational signatures. The current paradigm implies that a quiescent elliptical emerges

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2

Issa, Nader. "Modes and propagation in microstructured optical fibres." University of Sydney. Physics and Optical Fibre Technology Centre, 2005. http://hdl.handle.net/2123/613.

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Microstructured optical fibres (MOFs), also commonly called photonic crystal fibres or holey fibres, describe a type of optical fibre in which continuous channels of (typically) air run their entire length. These `holes' serve to both confine electromagnetic waves within the core of the fibre and to tailor its transmission properties. In order to understand and quantify both of these functions, a new computational algorithm was developed and implemented. It solves for the eigenvalues of Maxwell's wave equations in the two-dimensional waveguide cross-section, with radiating boundary conditions

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3

Mancino, Antonio. "On the structural and dynamical properties of a new class of galaxy models with a central BH." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amslaurea.unibo.it/18722/.

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This thesis work focuses on the dynamical properties of two-component galaxy models characterized by a stellar density distribution described by a Jaffe profile, and a galaxy (stars plus dark matter) density distribution following a r^(-3) shape at large radii. The dark matter (hereafter, DM) density profile is defined by the difference between the galaxy and the stellar profiles. The orbital structure of the stellar component is described by the Osipkov-Merritt (OM) radial anisotropy, and that of the DM halo is assumed isotropic; a black hole (BH) is also added at the center of the galaxy. T

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4

Cheng, Chia Hsuan, and 鄭嘉璿. "The Formation of Supermassive Binary Black Holes in Elliptical Galaxies." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/43502072329650587136.

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碩士<br>國立清華大學<br>物理系<br>104<br>We study the evolution of two supermassive black holes in the galaxy. We investigate whether two black holes can form a bound binary system within the age of the universe. Since the dynamical friction is the major physical process to determine the early stage of the formation of binary supermassive black holes, we also investigate its variables and other parameters such as the mass and the initial positions of the black holes. We use the simulation to study the behavior of two black holes in the galaxy. The results show that the evolution in the Hernquist model is

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5

Chang, Tsang-Huai, and 張蒼懷. "Study of the Characteristic Effect of Elliptical Holes Polishing by Rotating Abrasive Flow Machining." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/28811666725888207114.

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6

Tsai, Tsungyen, and 蔡宗諺. "BEM Analysis for Stress Concentrations of Bending Problem of Anisotropic Plates Containing Two Elliptical Holes." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/80496427955875267379.

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碩士<br>國立臺灣大學<br>應用力學研究所<br>103<br>This work uses a new boundary integral equation (BIE) and finite element method (FEM) to analyze an infinite anisotropic plate containing two elliptic/circular holes subjected to remote bending or twisting moments. The foundation of the boundary integral equation is the classical plate theory with Cauchy integral formula. The BIE is used to calculate the curvatures and moments on the boundaries directly. Numerical examples are given for orthotropic and isotropic plates with circular or elliptic holes under uniform bending and twisting moments. Comparison of th

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7

Shih, Tzu-Hsien, and 石子賢. "Effects of Different Semi-Elliptical Bolt Holes on the Stress Concentration of Tensile Wooden Members." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/38273044366339721678.

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碩士<br>國立臺灣大學<br>森林環境暨資源學研究所<br>98<br>Generally, the tensile strength of wood is larger than that of compression strength in longitudinal direction. Because wood tissue could be damaged by metal connector or fastener, stress concentration always occurred at wood near the interface between wood and metal. This is the reason why the tensile strength value is almost close to or even lower than compression value in structural design. In previous reviews, pioneers usually solved many problems by finite element analysis (FEA) simulation and assumed that the wood was isotropic. However, the wood i

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8

Wager, David. "The Influence of Elliptical Nozzle Holes on Mixing and Combustion in Direct Injection Natural Gas Engines." Thesis, 2008. http://hdl.handle.net/1807/17235.

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Experiments were conducted to compare mixing and combustion of natural gas jets from round and elliptical nozzle holes in an optically accessible combustion bomb. A flame ionization detector was used to measure the concentration fields of the two jet types. Pressure data, combustion imaging, and hydrocarbon measurements of exhaust gas were used to compare the ignition delay, heat release, and combustion efficiency of the two nozzles. Concentration measurements indicated that the elliptical nozzle produced jets with smaller rich core regions and lower peak concentrations at all conditions. Fi

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9

Habbaky, Charles. "A Comparative Study between Circular and Elliptical Nozzle Holes on Natural Gas Combustion and Soot Formation in a Direct Injection Engine." Thesis, 2012. http://hdl.handle.net/1807/33230.

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The effects of changing nozzle hole patterns and hole geometry in a direct injection natural gas optically accessible engine was investigated. Six nozzles were studied having a 1 hole, 3 hole, and 9 hole pattern; each having either elliptical or circular hole geometries. Combustion images were taken with a high speed camera and the nozzles were compared on the basis of their ignition delay time, rate of heat release, net heat release, fuel utilization, gross indicated thermal efficiency, and particulate emissions. The best performance in all categories was achieved by the 9 hole nozzles which

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10

Glass, Lisa Anne. "The Central regions of early-type galaxies in nearby clusters." Thesis, 2012. http://hdl.handle.net/1828/4188.

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Remarkably, the central regions of galaxies are very important in shaping and influencing galaxies as a whole. As such, galaxy cores can be used for classification, to determine which processes may be important in galaxy formation and evolution. Past studies, for example, have found a dichotomy in the inner slopes of early-type galaxy surface brightness profiles. Using deprojections of the galaxies from the ACS Virgo and Fornax Cluster Surveys (ACSVCS/FCS), we show that, in fact, this dichotomy does not exist. Instead, we demonstrate that the brightest early-type galaxies tend to have central

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11

Wang, Rui-Sheng, and 王瑞聖. "Analysis of Elliptical-Hole Photonic Crystal Fiber." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/31748481091071152828.

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碩士<br>義守大學<br>電機工程學系<br>101<br>Through Vector Boundary Element Method, this thesis is analyzing and simulating elliptical-hole photonic crystal fiber. For the propagation modes, we change the air hole radius, elliptical ratio, wavelength, and turn the angle of air hole structure. In here, we analyze not only in the characteristics of mode also including polarization. As shown in the result, we will discuss the effective index of the EPCF, we knows inversely proportional to relationship of effective index and wavelength. At η=1.2, the effective index is the maximum value. Therefore, we will dis

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12

Wang, Yuhsiang, and 王昱翔. "An Analysis of Sheet Metal Elliptical Cup Drawing and Elliptical Hole-flanging Processes." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/06237532778782981816.

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碩士<br>聖約翰科技大學<br>自動化及機電整合研究所<br>99<br>This essay is base on I-DEAS to build a module and to grid computing, and adopting the conception of the Prandtl-reuss plasticity equations, the von Mises yield criterion, large deformation finite element model, and updated Lagrangian formulation (ULF) to use the DYNAFORM Finite Element Method, FEM simulator. Using the values of tensile testing on cold rolled steel (SPCC-SD) to be the standard values of production procedure simulation analyzing, and simulating the deep drawing process of elliptical cup and the elliptical hole convex axis forming. Then t

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13

Seshagiri, Sanjeev. "Identification of Force Coefficients in Two Squeeze Film Dampers with a Central Groove." Thesis, 2011. http://hdl.handle.net/1969.1/ETD-TAMU-2011-05-9430.

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Squeeze Film Dampers (SFD) provide viscous damping in rotor bearing systems to reduce lateral vibration amplitudes and to isolate mechanical components. Aircraft engine shafts, often supported on roller bearings, operate at high rotational speeds and are susceptible to large amplitude shaft whirl due to rotor imbalance. SFDs aid to reduce such large whirl amplitudes while also eliminating rotor instabilities. he current work quantifies experimentally the forced performance of two parallel squeeze SFDs separated by a central groove. Force coefficients are identified in a specialized SFD test

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14

Kuo, Yu-Ting, and 郭育廷. "Stress Concentration of Laminated Composite Plate with an Elliptical Hole." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/24916817542251186532.

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碩士<br>逢甲大學<br>機械工程學所<br>94<br>The characteristic of its structure laminated composite plate with an Elliptial hole, while building up model necessarily needing to first understand laminate composite material the stress around distribute in the condition. Because an Elliptial hole under loaded as the structure investigate the stress distribution and the stress concentration factor around an Elliptial hole of a laminated composite plate with an Elliptial hole. The laminated composite plate under loads behavior then the maximum normal stress as 90° , and the maximum compressive stress as 0° aroun

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15

Huang, Po-Jung, and 黃柏融. "A Study of stress concentration forOrthotropic plates containing elliptic holes." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/22759632672979992774.

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碩士<br>國立臺灣大學<br>應用力學研究所<br>101<br>With dual boundary integral equation, combined from Cauchy''s formalism and anisotropic elastic mechanics, this thesis is aimed to analyze the maximum stress concentration on the inner plate or boundary by five different types of elliptic holes in an orthotropic plate. First, the analytic solution of the infinite plate with single elliptic hole under uniform tensile stress is used to confirm the accuracy of the numerical method. Second, five different types of elliptic holes are compared with literature numerical solution for isotropic material to fu

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16

Huang, Chih-hsiung, and 黃鋕雄. "An Analysis of Elliptical Hole-flanging Forming Process of Sheet Metal." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/j9h3ek.

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碩士<br>國立臺灣科技大學<br>機械工程系<br>94<br>A methodology of formulating an elasto-plastic three-dimensional finite element model, which is based on Prandtl-Reuss flow rule and Hill’s yield criterion respectively, associated with an updated Lagrangian formulation, is developed to simulation sheet metal flanging process. The shape function derived from a four-node quadrilateral degenerated shell element associated into the stiffness matrix to constitute the finite element model. An extended rmin algorithm is proposed to formulate the boundary condition, such as nodal penetration and separation, strain inc

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17

王廷軒. "The Strength of Braided Composite Plates Each with an Inclined Elliptical Hole." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/49941383892006376911.

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碩士<br>逢甲大學<br>機械與電腦輔助工程學系<br>104<br>In the work, the Finite Element software —ANSYS— and Point Stress Criterion are used for studying the fracture strength of braided composite plates each with an elliptical hole of inclined angle 45o. First, carbon fiber braid was impregnated with epoxy resin to make braided composite plates by hot-press method. Then, by means of metallographic microscope, we observed the cross-section of a specimen along the direction of fiber yarn weaving, and got the high length ratio and the fiber volume fraction. Furthermore, the Stiffness Averaging Method was adopted to

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18

莊啟揚. "A Study on the Strength of Composite Laminates each with an Elliptical Hole." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/88603940195379749401.

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19

Sun, Han-Yun, and 孫涵筠. "A Study on the Strength of Braided Composite Laminates with a Central Inclined Elliptical Hole." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/35jyux.

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碩士<br>逢甲大學<br>纖維與複合材料學系<br>105<br>In this study, we used both Finite Element Based Point Stress Criterion (FEBPSC) and experiments to investigate the notched strengths of braided composite laminates each with an inclined elliptical hole of inclined angle 30o. First, carbon braided fabrics were reinforced with epoxy resin to make composite plates by hot-press method. Then,braided composite plates were made into tensile specimens each with an central inclined elliptical hole. Tensile tests were applied to the specimen to obtain their notched strengths. The finite element analysis based point str

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20

江志言. "A Study of the Notched Strength of Braided Composite Plates with a Central Elliptical Hole." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/52119972250958503007.

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21

WIKARTA, ALIEF, and 維佳達. "Antiplane Interaction of a Crack with a Reinforced Elliptical Hole Embedded in an Infinite Matrix." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/27749310318686189396.

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碩士<br>國立臺灣科技大學<br>機械工程系<br>97<br>Analytical exact solutions of a fundamental anti-plane interaction problem for a reinforced elliptical hole embedded in an infinite matrix with an arbitrarily oriented crack located in the matrix under a remote uniform shear load are provided in this paper. Investigations on the present anti-plane problem are tedious due to the presence of material in-homogeneities and geometric discontinuities. Based on the technique of conformal mapping and the method of analytical continuation in conjunction with the alternating technique, the general expressions of the stre

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22

WANG, JING-XING, and 王淨行. "FEM computational methods of the endochronic plasticity on the thin plate with central elliptical hole." Thesis, 1991. http://ndltd.ncl.edu.tw/handle/74018223415161355763.

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23

陳威穎. "A Study of the Strength of Nano-silica/Braided Composite Plates with a Central Elliptical Hole." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/53600034520425263196.

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24

Wu, Jiunn-Shyan, and 吳俊賢. "A 3-D Anal. of Anisotropic Plates Containing an Elliptic Hole." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/29097283645007855184.

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25

Sun-Chih, Tsai, and 蔡尚志. "Thermal stresses in an infinite body with a partially reinforced elliptic hole." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/87089871312465203087.

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碩士<br>國立臺灣科技大學<br>機械工程系<br>87<br>This paper provides an analytical exact closed-form solution for a partially reinforced elliptic hole embedded in an infinite isotropic or anisotropic medium under a remote uniform heat flow. Based on the method of analytical continuation which can staisfy the boundary conditions and the technique of conformal mapping, the full field solutions for the temperature and stresses are obtained in compact complex form. The rotation angle of a reinforced portion on the hole due to the application of a remote uniform heat flow is determined analytically which is depend

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26

WONG, WEI-ZE, and 翁維澤. "Prediction of the Notched Strength of Braided Composite plates Each with an Elliptical Hole of 15 inclining Angle." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/7v7w58.

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碩士<br>逢甲大學<br>機械與電腦輔助工程學系<br>106<br>In this paper, we mainly investigate the failure strength of braided composite plates each with an elliptical hole of 15o inclining angle. The Finite Element Analysis software ANSYS and the point stress criterion are used to predict the notched strength. First, we put the carbon fiber braid into the mixed liquid with epoxy resin, and then use hot-press method to make braided composite plates. Next, we use the tensile testing machine to obtain the experimental data and employ the diamond cutter to cut a sample along the direction of fiber yarn weaving. Then,

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27

CHEN, LI-PING, and 陳麗萍. "Plane stress analysis of A 2-D finite-length plate containg a circular/elliptical inclusion/hole using BEM." Thesis, 1992. http://ndltd.ncl.edu.tw/handle/88237124856160666185.

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28

WANG, ZHAO-LIN, and 王兆麟. "Failure prediction of a plate weakened by an ellptic hole or elliptic rigid inclusion under thermal or mechanical load." Thesis, 1991. http://ndltd.ncl.edu.tw/handle/69677236204945237610.

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29

Tupholme, Geoffrey E. "Row of shear cracks moving in one-dimensional hexagonal quasicrystalline materials." 2014. http://hdl.handle.net/10454/9236.

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No<br>Representations for the stress fields created around an infinite row of collinear, antiplane shear cracks moving within one-dimensional hexagonal quasicrystals, and the resulting stress intensity factors and the J-integral, are determined in closed-form and discussed, using an extended method of dislocation layers. The solutions for a finite quasicrystalline plate containing a single moving crack and a plate with a moving edge crack are also provided by this analysis. (C) 2014 Elsevier Ltd. All rights reserved.

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