Relevant bibliographies by topics / Elliptical holes

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Academic literature on the topic 'Elliptical holes'

Author: Grafiati
Published: 4 June 2021
Last updated: 7 February 2022

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Journal articles on the topic "Elliptical holes"

1

Hirth, J. P. "Dislocations within elliptical holes." Acta Materialia 47, no. 1 (1998): 1–4. http://dx.doi.org/10.1016/s1359-6454(98)00351-6.

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Wang, Shuang, Cun-Fa Gao, and Zeng-Tao Chen. "Interaction between two nanoscale elliptical holes with surface tension." Mathematics and Mechanics of Solids 24, no. 5 (2018): 1556–66. http://dx.doi.org/10.1177/1081286518801051.

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In this paper, the plane problem of two elliptical nanoscale holes with surface tension is investigated. Firstly, the basic equations are given via the complex variable methods. Then, the stress boundary condition caused by surface tension is derived through the integral-form Gurtin–Murdoch model. The problem is finally solved by the conformal mapping along with the series expansion methods. The results show that the stress field decreases as the two holes become further away from each other. When the distance between the two holes is more than three times the sum of their sizes, the interacti
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Persson, E., and E. Madenci. "Composite laminates with elliptical pin-loaded holes." Engineering Fracture Mechanics 61, no. 2 (1998): 279–95. http://dx.doi.org/10.1016/s0013-7944(98)00041-1.

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Bing, Pibin, Shichao Huang, Jialei Sui, Hua Wang, and Yongen Ren. "A sensor based on D-shaped photonic crystal fiber with elliptical holes." Modern Physics Letters B 33, no. 32 (2019): 1950397. http://dx.doi.org/10.1142/s0217984919503974.

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A sensor based on D-shaped photonic crystal fiber (PCF) with elliptical holes is designed and numerical studied by finite element method (FEM). The refractive index (RI) of analyte can be detected by using surface plasma resonance effect and optical fiber with elliptical holes can solve the phase matching problem. The size of central hole, the major axis of the two elliptical holes near polishing plane in first layer and polishing depth are adjusted to explore the influence of these parameters on wavelength sensitivity and amplitude sensitivity of the sensor. Polishing depth has a great influe
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Kovačević, Andjelka B., Jian-Min Wang, and Luka Č. Popović. "Kinematic signatures of reverberation mapping of close binaries of supermassive black holes in active galactic nuclei." Astronomy & Astrophysics 635 (February 28, 2020): A1. http://dx.doi.org/10.1051/0004-6361/201936398.

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Context. An unresolved region in the relative vicinity of the event horizon of a supermassive black holes (SMBH) in active galactic nuclei (AGN) radiates strongly variable optical continuum and broad-line emission flux. These fluxes can be processed into two-dimensional transfer functions (2DTF) of material flows that encrypt various information about these unresolved structures. An intense search for kinematic signatures of reverberation mapping of close binary SMBH (SMBBH) is currently ongoing. Aims. Elliptical SMBBH systems (i.e. both orbits and disc-like broad-line regions (BLR) are ellipt
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HEWIDY, M. S., and V. K. JAIN. "On the production of elliptical holes by ECM." International Journal of Production Research 25, no. 3 (1987): 433–45. http://dx.doi.org/10.1080/00207548708919851.

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Fabian, A. C., and C. R. Canizares. "Do massive black holes reside in elliptical galaxies?" Nature 333, no. 6176 (1988): 829–31. http://dx.doi.org/10.1038/333829a0.

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Forskitt, M., J. R. Moon, and P. A. Brook. "Elastic properties of plates perforated by elliptical holes." Applied Mathematical Modelling 15, no. 4 (1991): 182–90. http://dx.doi.org/10.1016/0307-904x(91)90007-c.

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Geerthana, S., A. Sivanantha Raja, and D. Shanmuga Sundar. "Design and optimization of photonic crystal fiber with improved optical characteristics." Journal of Nonlinear Optical Physics & Materials 24, no. 04 (2015): 1550051. http://dx.doi.org/10.1142/s0218863515500514.

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A highly birefringent photonic crystal fiber (PCF) with large nonlinearity, low dispersion and low confinement loss is designed by introducing a solid elliptical core structure with spiral lattice of circular air holes as a cladding. The dependence of different geometrical parameters, such as pitch size, diameter of air holes and arrangement of air holes are investigated. By optimizing the available parameters, the designed elliptical–spiral PCF offers high birefringence up to 0.005264, high nonlinearity up to 8683.59[Formula: see text]W[Formula: see text][Formula: see text]km[Formula: see tex
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Kovačević, Andjelka B., Yu-Yang Songsheng, Jian-Min Wang, and Luka Č. Popović. "Probing the elliptical orbital configuration of the close binary of supermassive black holes with differential interferometry." Astronomy & Astrophysics 644 (December 2020): A88. http://dx.doi.org/10.1051/0004-6361/202038733.

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Context. Obtaining detections of electromagnetic signatures from the close binaries of supermassive black holes (CB-SMBH) is still a great observational challenge. The Very Large Telescope Interferometer (VLTI) and the Extremely Large Telescope (ELT) will serve as a robust astrophysics suite offering the opportunity to probe the structure and dynamics of CB-SMBH at a high spectral and angular resolution. Aims. Here, we explore and illustrate the application of differential interferometry on unresolved CB-SMBH systems in elliptical orbital configurations. We also investigate certain peculiariti
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Dissertations / Theses on the topic "Elliptical holes"

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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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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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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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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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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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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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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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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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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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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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Books on the topic "Elliptical holes"

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Southin, Justine Clair. Massive black holes in the centres of elliptical galaxies. University of Birmingham, 1999.

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P, Minicozzi William, ed. A course in minimal surfaces. American Mathematical Society, 2011.

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Book chapters on the topic "Elliptical holes"

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De Zeeuw, P. T. "Central Black Holes and Dark Halos in Elliptical Galaxies." In Stellar Populations. Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-011-0125-7_20.

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Thomas, Jens. "Schwarzschild Modelling of Elliptical Galaxies and Their Black Holes." In Reviews in Modern Astronomy. Wiley-VCH Verlag GmbH & Co. KGaA, 2011. http://dx.doi.org/10.1002/9783527634842.ch8.

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Lin, Jia-Keng, and Charles E. S. Ueng. "Stress Concentrations in Orthotropic Laminates Containing Two Elliptical Holes." In Composite Structures 4. Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-009-3457-3_32.

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Jiakeng, Lin, and Wang Linjiang. "Stress Concentration in a Finite Width Laminate Containing Several Elliptical Holes." In Composite Structures 5. Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-1125-3_42.

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Churazov, E., S. Sazonov, R. Sunyaev, W. Forman, C. Jones, and H. Böhringer. "Supermassive Black Holes in Elliptical Galaxies: Switching from Very Bright to Very Dim." In ESO Astrophysics Symposia. Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-74713-0_67.

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Khechai, Abdelhak, Abdelouahab Tati, Mohamed Ouejdi Belarbi, and Abdelhamid Guettala. "Finite Element Analysis of Stress Concentrations in Isotropic and Composite Plates with Elliptical Holes." In Design and Modeling of Mechanical Systems - II. Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-17527-0_43.

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Zhang, Yani. "High-Nonlinearity Negative Dispersion Effect of Crystal Fiber with Elliptical Holes Square-Mesh Cladding." In Lecture Notes in Electrical Engineering. Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-21747-0_79.

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Craciun, Eduard-Marius. "Prestressed Orthotropic Material Containing an Elliptical Hole." In Advanced Structured Materials. Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-0959-4_18.

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Soni, Sandeep, and Udaykumar Saindane. "Stress Analysis of Infinite Plate with Elliptical Hole." In Lecture Notes in Mechanical Engineering. Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-6469-3_50.

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Gibbons, G. W. "The Elliptic Interpretation of Black Holes and Quantum Mechanics." In Particle Physics. Springer US, 1987. http://dx.doi.org/10.1007/978-1-4613-1877-4_5.

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Conference papers on the topic "Elliptical holes"

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Khajehhasani, Siavash, and B. A. Jubran. "Film Cooling From Circular and Elliptical Exit Shaped Holes With Sister Hole Influence." In ASME Turbo Expo 2013: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/gt2013-95138.

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In traditional film cooling configuration, coolant is injected through a cylindrical pipe with an inclined angle (0&lt;α&lt;90), which results in an elliptical exit shaped hole (EESH) at the blade surface. The present study makes use of an elliptical injection coolant pipe that leads to a circular exit shaped hole (CESH). The film cooling effectiveness and the associated flow for both cases of circular and elliptical shaped holes are numerically investigated. A comparison between the predicted results and the available experimental results from the literature for blowing ratios of M = 0.5 and
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Szarniak, Przemyslaw, Ryszard Buczynski, Dariusz Pysz, Ireneusz Kujawa, Marcin Franczyk, and Ryszard Stepien. "Highly birefringent photonic crystal fibers with elliptical holes." In Congress on Optics and Optoelectronics, edited by Waclaw Urbanczyk, Bozena Jaskorzynska, and Philip S. J. Russell. SPIE, 2005. http://dx.doi.org/10.1117/12.623045.

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Aluko, O., and H. A. Whitworth. "Contact Stress Analysis Around Elliptic Pin-Loaded Holes in Orthotropic Plates." In ASME 2010 International Mechanical Engineering Congress and Exposition. ASMEDC, 2010. http://dx.doi.org/10.1115/imece2010-37662.

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This analysis utilizes the complex stress function approach to obtain the stress distribution in pin loaded composite joints with elliptic openings. The stress functions were derived from assumed displacement expressions that satisfy the boundary conditions around the hole. In the method of solution Coulomb friction was used to determine the prescribed displacements at the boundary. The material properties of graphite/epoxy and carbon fiber reinforced plastics laminates were used in this investigation and the results also compared with available data for joints with circular openings. It was r
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Kujawa, Ireneusz, Ryszard Buczynski, Dariusz Pysz, et al. "Silicate photonic crystal fibers with rectangular lattice and elliptical holes." In International Congress on Optics and Optoelectronics, edited by Kyriacos Kalli. SPIE, 2007. http://dx.doi.org/10.1117/12.723455.

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Li, Jinjin, Xin Yan, and Kun He. "Effect of Non-Axisymmetric Endwall Profiling on Heat Transfer and Film Cooling Effectiveness of a Transonic Rotor Blade." In ASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/gt2019-90154.

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Abstract Effects of non-axisymmetric endwall profiling on total pressure loss, heat transfer and film cooling effectiveness of a transonic rotor blade were numerically investigated. The numerical methods, including the turbulence model and grid sensitivity, were validated with the existing experimental data. To reduce thermal load on endwall, non-axisymmetric endwall profiling near leading edge and at pressure-side corner area were performed with a range of contour amplitudes. Heat transfer and flow fields near the profiled endwalls were analyzed and also compared to the plain endwall configur
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Xiao, Kun, Juan He, and Zhenping Feng. "Film Cooling Effectiveness Enhancement Using Multi-Longitudinal Vortex Generated by Alternating Elliptical Film Holes." In ASME Turbo Expo 2021: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/gt2021-58451.

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Abstract This paper proposed an alternating elliptical film hole for gas turbine blade to restrain kidney vortex and enhance film cooling effectiveness, based on the multi-longitudinal vortexes generated in alternating elliptical tube. The detailed flow structures in film hole delivering tube and out of the film hole, adiabatic film cooling effectiveness distributions as well as the total pressure loss coefficient were investigated. The delivering tube of alternating elliptical film hole consists of two straight sections and a transition section. In the straight sections, the cross section of
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Aluko, O., and H. A. Whitworth. "Bearing Strength Analysis of Pin-Loaded Elliptical Holes in Laminated Composite Joints." In ASME 2011 International Mechanical Engineering Congress and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/imece2011-62507.

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An analysis was performed to predict bearing strength and mode of failure of pin loaded orthotropic plates with elliptic holes of varying sizes using two dimensional stress analyses and a characteristic curve model. The stresses required to analyze joint failure were obtained by utilizing complex stress functions that were determined from assumed displacement expressions that satisfy the boundary conditions around the hole. Three different joint geometries with major-to-minor diameter ratios ranging from 1 to 5 were evaluated and the analysis revealed that the joint strength was found to vary
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Zaineb, Gharsallah, Monia Najjar, and Vijay Janyani. "Slow light optimization in symmetric photonic crystal waveguide with elliptical holes." In 2016 22nd Asia-Pacific Conference on Communications (APCC). IEEE, 2016. http://dx.doi.org/10.1109/apcc.2016.7581469.

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Wang, Fanghua, Jing Ma, and Chun Jiang. "Dispersionless slow wave of photonic crystal slab with elliptical air holes." In 2007 International Nano-Optoelectronics Workshop. IEEE, 2007. http://dx.doi.org/10.1109/inow.2007.4302915.

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Song, Peng, Yanrong Tong, and Xinlian Chen. "A novel high birefringence photonic crystal fiber with squeezed elliptical holes." In 2010 3rd International Conference on Biomedical Engineering and Informatics (BMEI). IEEE, 2010. http://dx.doi.org/10.1109/bmei.2010.5639896.

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