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Literatura académica sobre el tema "Ellipsoidal analysis"

Autor: Grafiati

Publicado: 25 de mayo de 2024

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Artículos de revistas sobre el tema "Ellipsoidal analysis"

Møller, J. "Stereological analysis of particles of varying ellipsoidal shape". Journal of Applied Probability 25, n.º 2 (junio de 1988): 322–35. http://dx.doi.org/10.2307/3214440.

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Stereological analysis of d-dimensional particles of ellipsoidal shape based on lower-dimensional sections through the particles is discussed. It is proved that the non-void intersections between three parallel hyperplanes and an ellipsoid uniquely determine the ellipsoid, and based on this fact we may reconstruct ellipsoids from sectional information. Combining this reconstruction with a new sampling procedure we obtain a useful tool for non-parametric stereological analysis of particle aggregates of ellipsoids. Finally, parametric models for ellipsoids which are mathematically convenient for the present set up are introduced and discussed.

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Møller, J. "Stereological analysis of particles of varying ellipsoidal shape". Journal of Applied Probability 25, n.º 02 (junio de 1988): 322–35. http://dx.doi.org/10.1017/s0021900200040961.

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Giapalaki, S. N. y F. Kariotou. "The complete ellipsoidal shell-model in EEG imaging". Abstract and Applied Analysis 2006 (2006): 1–18. http://dx.doi.org/10.1155/aaa/2006/57429.

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This work provides the solution of the direct Electroencephalography (EEG) problem for the complete ellipsoidal shell-model of the human head. The model involves four confocal ellipsoids that represent the successive interfaces between the brain tissue, the cerebrospinal fluid, the skull, and the skin characterized by different conductivities. The electric excitation of the brain is due to an equivalent electric dipole, which is located within the inner ellipsoid. The proposed model is considered to be physically complete, since the effect of the substance surrounding the brain is taken into account. The direct EEG problem consists in finding the electric potential inside each conductive space, as well as at the nonconductive exterior space. The solution of this multitransmission problem is given analytically in terms of elliptic integrals and ellipsoidal harmonics, in such way that makes clear the effect that each shell has on the next one and outside of the head. It is remarkable that the dependence on the observation point is not affected by the presence of the conductive shells. Reduction to simpler ellipsoidal models and to the corresponding spherical models is included.

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Ross, C. T. F. y N. Rotherhamn. "Collapse of Inverted Hemi-Ellipsoidal Shell Domes Under Uniform Pressure". Journal of Ship Research 36, n.º 04 (1 de diciembre de 1992): 378–86. http://dx.doi.org/10.5957/jsr.1992.36.4.378.

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Nine hemi-ellipsoidal shell domes were tested to destruction, under uniform pressure acting on their concave surfaces. The shell domes varied from flat oblate hemi-ellipsoids to long prolate hemi-ellipsoids. The experimentally obtained collapse pressures showed that the flat oblate hemi-ellipsoidal domes and the long prolate hemi-ellipsoidal domes were stronger than the hemi-spherical and near hemi-spherical domes. The theoretical analysis was based on the finite-element method, and it showed that the theoretically obtained stresses were, in general, larger in magnitude than the experimentally obtained stresses.

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Gureeva, Natalya, Anatoliy Nikolaev y Mikhail Klochkov. "Continuos Parameterization of the Median Surface of an Ellipsoidal Shell and Its Geometric Parameters". Mathematical Physics and Computer Simulation, n.º 1 (marzo de 2020): 5–12. http://dx.doi.org/10.15688/mpcm.jvolsu.2020.1.1.

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When analyzing the stress-strain state of thin-walled structural elements that have the shape of an ellipsoid, it becomes necessary to calculate the geometric characteristics of the ellipsoidal surface. When using the canonical ellipsoid equation, regions of uncertainty appear in the Cartesian coordinate system at the intersection points of the ellipsoid surface with the horizontal coordinate plane. To exclude these areas of uncertainty, we propose an expression of the radius vector of an ellipsoidal surface whose projections are functions of two parametric representations in mutually perpendicular planes. One of the planes is the vertical plane XOZ, and the other plane is the plane perpendicular to the axis O at the point with the x coordinate. The parameter T of the ellipse obtained from the intersection of the ellipsoid with the XOZ plane was chosen as the argument of the first parametric function. The argument of the second parametric function t is the parameter of an ellipse formed as a result of the intersection of an ellipsoidal surface with a plane perpendicular to the abscissa axis at a distance of x from the origin. The proposed representation of the ellipsoidal surface allowed us to exclude uncertainties at the intersection points of the ellipsoid with the HOWE coordinate plane. By differentiating the proposed radius-vector expression at an arbitrary point on an ellipsoidal surface, we obtain relations for the basis vectors of an arbitrary point and their derivatives represented by components in the same local basis. These relations are necessary for the development of algorithms for numerical analysis of deformation processes of engineering structures that have ellipsoidal surfaces.

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Chong, Shuai, Lili Huang, Junchao Cao y Xiaoyang Lu. "The optimization design of the triangular mesh of the lamella ellipsoid reticulated shell and the comparative analysis of its static performance". E3S Web of Conferences 165 (2020): 06054. http://dx.doi.org/10.1051/e3sconf/202016506054.

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Using the traditional geometric principle and ANSYS software Parametric Design Language (APDL), the optimization method is given for the triangular shell mesh of lamella ellipsoid. The mechanical properties of two types of ellipsoidal reticulated shells, optimized isosceles shell (OIS) and traditional shell (TS), are analyzed by comparison with ANSYS software. The results show that the ellipsoidal reticulated shell composed of an optimized isosceles triangle mesh has better mechanical performance and is widely used in engineering.

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Ziggah, Y. Y., I. Yakubu y B. Kumi-Boateng. "Analysis of Methods for Ellipsoidal Height Estimation – The Case of a Local Geodetic Reference Network". Ghana Mining Journal 16, n.º 2 (20 de diciembre de 2016): 1–9. http://dx.doi.org/10.4314/gm.v16i2.1.

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Ghana’s local geodetic reference network is based on the War Office 1926 ellipsoid with data in latitude, longitude and orthometric height without the existence of ellipsoidal height. This situation makes it difficult to apply the standard forward transformation equation for direct conversion of curvilinear geodetic coordinates to its associated cartesian coordinates (X, Y, Z) in the Ghana local geodetic reference network. In order to overcome such a challenge, researchers resort to various techniques to obtain the ellipsoidal height for a local geodetic network. Therefore, this paper evaluates, compares, and discusses different methods for estimating ellipsoidal height for a local geodetic network. The investigated methods are the Abridged Molodensky transformation model, Earth Gravitational Model, and the Orthometric Height approach. To evaluate these methods, their estimated local ellipsoidal height values were implemented in the seven-parameter similarity transformation model of Bursa-Wolf. The performance of each of the methods was assessed based on statistical indicators of Mean Square Error (MSE), Mean Absolute Error (MAE), Horizontal Position Error (HE) and Standard Deviation (SD). The statistical findings revealed that, the Abridged Molodensky model produced more reliable transformation results compared with the other methods. It can be concluded that for Ghana’s local geodetic network, the most practicable method for estimating ellipsoidal height is the Abridged Molodensky transformation model. Keywords: Abridged Molodensky Model, Earth Gravitational Model, Orthometric Height, Geodetic Network

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Phan-Thien, N., T. Tran-Cong y M. Ramia. "A boundary-element analysis of flagellar propulsion". Journal of Fluid Mechanics 184 (noviembre de 1987): 533–49. http://dx.doi.org/10.1017/s0022112087003008.

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The swimming of a flagellar micro-organism by the propagation of helical waves along its flagellum is analysed by a boundary-element method. The method is not restricted to any particular geometry of the organism nor does it assume a specific wave motion for the flagellum. However, only results for an organism with a spherical or ellipsoidal cell body and a helically beating flagellum are presented here.With regard to the flagellum, it is concluded that the optimum helical wave (amplitude α and wavenumber k) has αk ≈ 1 (pitch angle of 45°) and that for the optimum flagellar length L/A = 10 (L being the flagellar length, A being the radius of the assumed spherical cell body) the optimum number of wavelengths Nλ is about 1.5. Furthermore there appears to be no optimal value for the flagellar radius a, with the thinner flagella being favoured. These conclusions show excellent quantitative agreement with those of slender-body theory.For the case of an ellipsoidal cell body, the optimum aspect ratios B/A and C/A of the ellipsoid are about 0.7 and 0.3 respectively; A, B and C are the principal radii of the ellipsoid. These and all of the above conclusions show good qualitative agreement with experimental observations of efficiently swimming micro-organisms.

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Kariotou, Fotini. "Electroencephalography in ellipsoidal geometry". Journal of Mathematical Analysis and Applications 290, n.º 1 (febrero de 2004): 324–42. http://dx.doi.org/10.1016/j.jmaa.2003.09.066.

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Lu, Xiao Yang, Jing Xin, Ran An, Jin Ming Liu, Lei Wang y Feng Cheng Liu. "Ellipsoid Reticulated Shell of Parametric Design and Analysis of Mechanical Characteristics". Applied Mechanics and Materials 716-717 (diciembre de 2014): 682–85. http://dx.doi.org/10.4028/www.scientific.net/amm.716-717.682.

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By using the parametric design language APDL, developed ellipsoidal reticulated shell parametric macros, only enter the long axis S1, short axis S2, high vector F, scale factor t, ring symmetric region shares Kn, radial nodes turns Nx, to generate the desired lattice shell; comparative analysis of 30 kinds of scheme through two types of single-shell ellipsoid reticulated shell with different rise span ratio force, studied its stress characteristics, providing a theoretical reference for designing and engineering ellipsoid reticulated shell application.

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Tesis sobre el tema "Ellipsoidal analysis"

Kharechko, Andriy. "Linear and ellipsoidal pattern separation : theoretical aspects and experimental analysis". Thesis, University of Southampton, 2009. https://eprints.soton.ac.uk/195011/.

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This thesis deals with a pattern classification problem, which geometrically implies data separation in some Euclidean feature space. The task is to infer a classifier (a separating surface) from a set or sequence of observations. This classifier would later be used to discern observations of different types. In this work, the classification problem is viewed from the perspective of the optimization theory: we suggest an optimization problem for the learning model and adapt optimization algorithms for this problem to solve the learning problem. The aim of this research is twofold, so this thesis can be split into two self-contained parts because it deals with two different type of classifiers each in a different learning setting. The first part deals with linear classification in the online learning setting and includes analysis of existing polynomial-time algorithms: the ellipsoid algorithm and the perceptron rescaling algorithm. We establish that they are based on different types of the same space dilation technique, and derive the parametric version of the latter algorithm, which allows to improve its complexity bound and exploit some extra information about the problem. We also interpret some results from the information-based complexity theory to the optimization model to suggest tight lower bounds on the learning complexity of this family of problems. To conclude this study, we experimentally test both algorithms on the positive semidefinite constraint satisfaction problem. Numerical results confirm our conjectures on the behaviour of the algorithms when the dimension of the problem grows. In the second part, we shift our focus from linear to ellipsoidal classifiers, which form a subset of second-order decision surfaces, and tackle a pattern separation problem with two concentric ellipsoids where the inner encloses one class (which is normally our class of interest, if we have one) and the outer excludes inputs of the other class(es). The classification problem leads to semidefinite program, which allows us to harness the efficient interior-point algorithms for solving it. This part includes analysis of the maximal separation ratio algorithm

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Poltera, Carina M. "Numerical analysis of spline generated surface Laplacian for ellipsoidal head geometry". Virtual Press, 2007. http://liblink.bsu.edu/uhtbin/catkey/1371849.

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Electroencephalography (EEG) is a valuable tool for clinical and cognitive applications. EEG allows for measuring and imaging of scalp potentials emitted by brain activity and allows researchers to draw conclusions about underlying brain activity and function. However EEG is limited by poor spatial resolution due to various factors. One reason is the fact that EEG electrodes are separated from current sources in the brain by cerebrospinal fluid (CSF), the skull, and the scalp. Unfortunately the conductivities of these tissues are not yet well known which limits the spatial resolution of EEG.Based on prior research, spatial resolution of the EEG can be improved via use of various mathematical techniques that provide increased accuracy of the representation of scalp potentials. One such method is the surface Laplacian. It has been shown to be a direct approach to improving EEG spatial resolution. Yet this approach depends on a geometric head model and much work has been done on assuming the human head to be spherical.In this project, we will develop a mathematical model for ellipsoidal head geometry based on surface Laplacian calculations by Law [1]. The ellipsoidal head model is more realistic to the human head shape and can therefore improve accuracy of the EEG imaging calculations. We will construct a computational program that utilizes the ellipsoidal head geometry in hopes to provide a more accurate representation of data fits compared to the spherical head models. Also, we will demonstrate that the spline surface Laplacian calculations do indeed increase the spatial resolution thereby affording a greater impact to the clinical and cognitive study community involving EEG.
Department of Physics and Astronomy

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Ansell, Seth. "A study of ellipsoidal variance as a function of mean CIELAB values in a textile data set /". Online version of thesis, 1995. http://hdl.handle.net/1850/12232.

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Zammali, Chaima. "Robust state estimation for switched systems : application to fault detection". Electronic Thesis or Diss., Sorbonne université, 2020. http://www.theses.fr/2020SORUS124.

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Cette thèse s’intéresse à l’estimation d’état et à la détection de défauts de systèmes linéaires à commutations. Deux approches d’estimation par intervalles sont développées. La première consiste à proposer une estimation d’état pour des systèmes linéaires à commutations à paramètres variants en temps continu et en temps discret. La deuxième approche consiste à proposer une nouvelle logique d’estimation du signal de commutations d’un système linéaire à commutations à entrée inconnue en combinant la technique par modes glissants et l’approche par intervalles. Le problème d’estimation d’état constitue une des étapes fondamentales pour traiter le problème de détection de défauts. Par conséquent, des solutions robustes pour la détection de défauts sont développées en utilisant la théorie des ensembles. Deux méthodologies ont été employées pour détecter les défauts : un observateur classique par intervalle et une nouvelle structure TNL d’observateur par intervalle. Les performances de détection de défauts sont améliorées en se basant sur un critère L∞. De plus, une stratégie robuste de détection de défauts est introduite en utilisant des techniques zonotopiques et ellipsoïdales. En se basant sur des critères d’optimisation, ces techniques sont utilisées pour fournir des seuils dynamiques pour l’évaluation du résidu et pour améliorer la précision des résultats de détection de défauts sans tenir compte de l’hypothèse de coopérativité. Les méthodes développées dans cette thèse sont illustrées par des exemples académiques et les résultats obtenus montrent leur efficacité
This thesis deals with state estimation and fault detection for a class of switched linear systems. Two interval state estimation approaches are proposed. The first one is investigated for both continuous and discrete-time linear parameter varying switched systems subject to measured polytopic parameters. The second approach is concerned with a new switching signal observer, combining sliding mode and interval techniques, for a class of switched linear systems with unknown input. State estimation remains one of the fundamental steps to deal with fault detection. Hence, robust solutions for fault detection are considered using set-membership theory. Two interval techniques are achieved to deal with fault detection for discrete-time switched systems. First, a commonly used interval observer is designed based on an L∞ criterion to obtain accurate fault detection results. Second, a new interval observer structure (TNL structure) is investigated to relax the cooperativity constraint. In addition, a robust fault detection strategy is considered using zonotopic and ellipsoidal analysis. Based on optimization criteria, the zonotopic and ellipsoidal techniques are used to provide a systematic and effective way to improve the accuracy of the residual boundaries without considering the nonnegativity assumption. The developed techniques in this thesis are illustrated using academic examples and the results show their effectiveness

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Loukkas, Nassim. "Synthèse d'observateurs ensemblistes pour l’estimation d’état basées sur la caractérisation explicite des bornes d’erreur d’estimation". Thesis, Université Grenoble Alpes (ComUE), 2018. http://www.theses.fr/2018GREAT040/document.

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Dans ce travail, nous proposons deux nouvelles approches ensemblistes pourl’estimation d’état basées sur la caractérisation explicite des bornes d’erreur d’estimation. Ces approches peuvent être vues comme la combinaison entre un observateur ponctuel et une caractérisation ensembliste de l’erreur d’estimation. L’objectif est de réduire la complexité de leur implémentation, de réduire le temps de calcul en temps réel et d’améliorer la précision et des encadrements des vecteurs d’état.La première approche propose un observateur ensembliste basé sur des ensembles invariants ellipsoïdaux pour des systèmes linéaires à temps-discret et aussi des systèmes à paramètres variables. L’approche proposée fournit un intervalle d’état déterministe qui est construit comme une somme entre le vecteur état estimé du système et les bornes de l’erreur d’estimation. L’avantage de cette approche est qu’elle ne nécessite pas la propagation des ensemble d’état dans le temps.La deuxième approche est une version intervalle de l’observateur d’état de Luenberger, pour les systèmes linéaires incertains à temps-discret, basés sur le calcul d’intervalle et les ensembles invariants. Ici, le problème d’estimation ensembliste est considéré comme un problème d’estimation d’état ponctuel couplé à une caractérisation intervalle de l’erreur d’estimation
In This work, we propose two main new approaches for the set-membershipstate estimation problem based on explicit characterization of the estimation error bounds. These approaches can be seen as a combination between a punctual observer and a setmembership characterization of the observation error. The objective is to reduce the complexity of the on-line implimentation, reduce the on-line computation time and improve the accuracy of the estimated state enclosure.The first approach is a set-membership observer based on ellipsoidal invariant sets for linear discrete-time systems and also for Linear Parameter Varying systems. The proposed approach provides a deterministic state interval that is build as the sum of the estimated system states and its corresponding estimation error bounds. The important feature of the proposed approach is that does not require propagation of sets.The second approach is an interval version of the Luenberger state observer for uncertain discrete-time linear systems based on interval and invariant set computation. The setmembership state estimation problem is considered as a punctual state estimation issue coupled with an interval characterization of the estimation error

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Hellwig, Michael [Verfasser]. "Analysis of mutation strength adaptation within evolution strategies on the ellipsoid model and methods for the treatment of fitness noise / Michael Hellwig". Ulm : Universität Ulm, 2017. http://d-nb.info/1126579572/34.

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Hellwig, Michael Lorenz [Verfasser]. "Analysis of mutation strength adaptation within evolution strategies on the ellipsoid model and methods for the treatment of fitness noise / Michael Hellwig". Ulm : Universität Ulm, 2017. http://d-nb.info/1126579572/34.

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Picasso, Bruno. "Stabilization of quantized linear systems: analysis, synthesis, performance and complexity". Doctoral thesis, Scuola Normale Superiore, 2008. http://hdl.handle.net/11384/85705.

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Filho, Sylvio Celso Tartari. "Modelagem e otimização de um robô de arquitetura paralela para aplicações industriais". Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/3/3152/tde-07122006-151723/.

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Este trabalho trata do estudo de robôs de arquitetura paralela, focando na modelagem e otimização dos mesmos. Não foi construído nenhum tipo de protótipo físico, contudo os modelos virtuais poderão, no futuro, habilitar tal façanha. Após uma busca por uma aplicação que se beneficie do uso de um robô de arquitetura paralela, fez-se uma pesquisa por arquiteturas viáveis já existentes ou relatadas na literatura. Escolheu-se a mais apta e prosseguiu-se com os estudos e modelagem cinemática e dinâmica, dando uma maior ênfase na cinemática e dinâmica inversa, esta última utilizando a formulação de Newton - Euler. Foi construído um simulador virtual em ambiente MATLAB 6.5, dotado de várias capacidades como interpolação linear e circular, avanço e uso de múltiplos eixos coordenados. Seu propósito principal é o de demonstrar a funcionalidade e eficácia dos métodos utilizados. Depois foi incorporado ao simulador um algoritmo de cálculo do volume de trabalho da máquina que utiliza alguns dados do usuário para calcular o volume, que pode ser aquele atrelado a uma postura em particular ou o volume de trabalho de orientação total. Algoritmos para medir o desempenho da máquina quanto à uniformidade e utilização da força dos atuadores foram construídos e também incorporados ao simulador, que consegue mostrar o elipsóide de forças ao longo de quaisquer movimentos executados pela plataforma móvel. Quanto à otimização, parte do ferramental previamente construído foi utilizado para que se pudesse chegar a um modelo de uma máquina que respeitasse restrições mínimas quanto ao tamanho e forma de seu volume de trabalho, mas ainda mantendo o melhor desempenho possível dentro deste volume.
This work is about the study of parallel architecture robots, focusing in modeling and optimization. No physical prototypes were built, although the virtual models can help those willing to do so. After searching for an application that could benefit from the use of a parallel robot, another search was made, this time for the right architecture type. After selecting the architecture, the next step was the kinematics and dynamics analysis. The dynamics model is developed using the Newton ? Euler method. A virtual simulator was also developed in MATLAB 6.5 environment. The simulator?s main purpose was to demonstrate that the methods applied were correct and efficient, so it has several features such as linear and circular interpolations, capacity to use multiple coordinate systems and others. After finishing the simulator, an algorithm to calculate the machine workspace was added. The algorithm receives as input some desired requirements regarding the manipulator pose and then calculates the workspace, taking into consideration imposed constraints. Lastly, algorithms capable to measure the manipulator?s performance regarding to its actuator and end-effector force relationship were also incorporated into the simulator that calculates the machine?s force ellipsoid during any movement, for each desired workspace point. For the optimization procedures, some previously developed tools were used, so that the resulting model was capable to respect some workspace constraints regarding size and shape, but also maintaining the best performance possible inside this volume.

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Liu, Ming-yi y 劉明益. "Synthesis and Optical Analysis of Ellipsoidal Hematite (α-Fe2O3) Colloidal Particles". Thesis, 2010. http://ndltd.ncl.edu.tw/handle/90064517751926768957.

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碩士
國立中正大學
化學工程所
98
The dispersion property and structural features of colloidal particles can be characterized by light scattering techniques. Previous studies of ellipsoidal colloidal particles lack complete light scattering characterizations. In this study, we describe the synthesis and optical analysis of ellipsoidal colloidal particles made of hematite. The ellipsoidal hematite particles were prepared by forced hydrolysis method, which disperse well in water after adding TMAH surfactant. The dynamics and structure of bare hematite particles and TMAH-stabilized hematite particles were investigated by dynamic light scattering (DLS), depolarized dynamic light scattering (DDLS), and static light scattering (SLS). The dispersity of the two types of colloidal particles can be characterized by DLS, giving the effective radius of particles. Compared with SEM results, the size and shape of the particles in solution state can be reasonably obtained by DDLS and SLS. Overall, we found that the SLS analysis using the ellipsoid form factor can best described the size and shape of the colloidal particles synthesized.

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Libros sobre el tema "Ellipsoidal analysis"

Elwood, Byerly William. An elementary treatise on Fourier's series and spherical, cylindrical, and ellipsoidal harmonics, with applications to problems in mathematical physics. Mineola, N.Y: Dover Publications, 2003.

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1966-, Sze Kin Yip y United States. National Aeronautics and Space Administration., eds. Automated composite ellipsoid modelling for high frequency GTD analysis. Columbus, Ohio: Ohio State University, 1991.

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Hobson, E. W. The Theory of Spherical and Ellipsoidal Harmonics. Cambridge University Press, 2012.

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Byerly, William Elwood. Elementary Treatise on Fourier's Series, an: And Spherical, Cylindrical, and Ellipsoidal Harmonics, with Applications to Problems in Mathematical. Dover Publications, Incorporated, 2014.

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An Elementary Treatise on Fourier's Series and Spherical, Cylindrical, and Ellipsoidal Harmonics: With Applications to Problems in Mathematical Physics. Adamant Media Corporation, 2005.

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A treatise on analytical statics.: With illustrations taken from the theories of electricity and magnetism. 2^a ed. Cambridge [Cambridgeshire]: University Press, 1986.

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A treatise on analytical statics: With illustrations taken from the theories of electricity and magnetism. 2^a ed. Cambridge [England]: University Press, 1986.

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Capítulos de libros sobre el tema "Ellipsoidal analysis"

Kurzhanski, Alexander B. y Pravin Varaiya. "Ellipsoidal Techniques for Reachability Analysis". En Hybrid Systems: Computation and Control, 202–14. Berlin, Heidelberg: Springer Berlin Heidelberg, 2000. http://dx.doi.org/10.1007/3-540-46430-1_19.

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Anderson, Forrest y Felix Morgan. "Active Imaging Analysis via Ellipsoidal Projections". En Acoustical Imaging, 171–82. Boston, MA: Springer US, 1995. http://dx.doi.org/10.1007/978-1-4615-1943-0_18.

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Pauli, Josef y Gerald Sommer. "Ellipsoidal Bias in Learning Appearance-Based Recognition Functions". En Multi-Image Analysis, 201–13. Berlin, Heidelberg: Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/3-540-45134-x_15.

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Tavasci, Luca, Enrica Vecchi y Stefano Gandolfi. "Definition of the Local Geoid Undulation Using Non-contemporary GNSS-Levelling Data on Subsidence Area: Application on the Adriatic Coastline". En Communications in Computer and Information Science, 259–70. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-94426-1_19.

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AbstractThe knowledge of the so-called geoid undulation, which represents the height of the geoid above a reference ellipsoid, is a fundamental step to link ellipsoidal heights measured using satellite systems and orthometric heights. Several geoid models are available at the time both at the national or global scale, which can be used for the purpose. Another way to define the geoid undulation is to perform joint measures with GNSS and spirit levelling over common benchmarks. This requires onerous measurements that is seldom possible to perform due to their cost. In this work, we evaluated the possibility to define a local model of the geoid undulation using already available spirit levelling orthometric heights and GNSS ellipsoidal heights measured about 13 years later. The test area is the Emilia-Romagna Adriatic coastline, an area of great interest both from the environmental and economic point of view, which is also undergoing consistent subsidence phenomena.Test results show that the available measurements allow defining a geoid undulation that is coherent with the shape defined by the gravimetric models and also allows to transform ellipsoidal heights into orthometric ones more consistent with the height reference available on the surveyed area. A 7 cm overall bias with respect to the ITALGEO05 was found, whereas ITG2009 and EGM2008 have higher differences. The use of subsidence models to align over time the coordinates used to define the geoid undulation has proven to be a fundamental step. The analysis on the a-priori uncertainty in the geoid height definition shown that the combined use of much more precise GNSS coordinates and contemporary spirit levelling campaign is necessary to significantly improve the resulting geoid height.

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Kropat, Erik, Gerhard-Wilhelm Weber y Selma Belen. "Dynamical Gene-Environment Networks Under Ellipsoidal Uncertainty: Set-Theoretic Regression Analysis Based on Ellipsoidal OR". En Dynamics, Games and Science I, 545–71. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-11456-4_35.

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Muc, A. "Buckling Analysis of Laminated Ellipsoidal Shells Subjected to External Pressure". En Composite Structures, 307–23. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3662-4_24.

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Kropat, Erik, Gerhard-Wilhelm Weber y Chandra Sekhar Pedamallu. "Regulatory Networks under Ellipsoidal Uncertainty – Data Analysis and Prediction by Optimization Theory and Dynamical Systems". En Intelligent Systems Reference Library, 27–56. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-23241-1_3.

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Jägersküpper, Jens. "Rigorous Runtime Analysis of the (1+1) ES: 1/5-Rule and Ellipsoidal Fitness Landscapes". En Foundations of Genetic Algorithms, 260–81. Berlin, Heidelberg: Springer Berlin Heidelberg, 2005. http://dx.doi.org/10.1007/11513575_14.

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Kodama, Akio. "On complex manifolds exhausted by biholomorphic images of generalized complex ellipsoids $$\mathbb{E}$$ (n;n1, ... , ns;p1, ... , ps)". En Complex Analysis, 169–74. Wiesbaden: Vieweg+Teubner Verlag, 1991. http://dx.doi.org/10.1007/978-3-322-86856-5_27.

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Webster, S. M. "Segre Polar Correspondence and Double Valued Reflection for General Ellipsoids". En Analysis and Geometry in Several Complex Variables, 273–88. Boston, MA: Birkhäuser Boston, 1999. http://dx.doi.org/10.1007/978-1-4612-2166-1_13.

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Actas de conferencias sobre el tema "Ellipsoidal analysis"

Chatjigeorgiou, Ioannis K., Vanessa Katsardi y Touvia Miloh. "Hydrodynamics and ellipsoidal harmonics". En INTERNATIONAL CONFERENCE OF NUMERICAL ANALYSIS AND APPLIED MATHEMATICS (ICNAAM 2017). Author(s), 2018. http://dx.doi.org/10.1063/1.5044177.

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Zhenhai Jiang, Qun Wei y Hongguang Jia. "Thermal analysis on supersonic ellipsoidal dome". En 2011 International Conference on Multimedia Technology (ICMT). IEEE, 2011. http://dx.doi.org/10.1109/icmt.2011.6001681.

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Athanasiadou, Evagelia S. y Stefania Zoi. "Detection of a rigid thermoelastic ellipsoidal scatterer". En INTERNATIONAL CONFERENCE OF NUMERICAL ANALYSIS AND APPLIED MATHEMATICS ICNAAM 2019. AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0026779.

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Lee, W. S. "Mini-Frac Analysis Based on Ellipsoidal Geometry". En SPE Annual Technical Conference and Exhibition. Society of Petroleum Engineers, 1986. http://dx.doi.org/10.2118/15369-ms.

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Voropay, Olexiy. "Ellipsoidal Tolerances Analysis Ensuring Product Yield Probability". En 2007 9th International Conference - The Experience of Designing and Applications of CAD Systems in Microelectronics. IEEE, 2007. http://dx.doi.org/10.1109/cadsm.2007.4297577.

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Filip, Jiri y Radomir Vavra. "Anisotropic materials appearance analysis using ellipsoidal mirror". En IS&T/SPIE Electronic Imaging, editado por Maria V. Ortiz Segovia, Philipp Urban y Francisco H. Imai. SPIE, 2015. http://dx.doi.org/10.1117/12.2078361.

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Fragoyiannis, George, Foteini Kariotou y Panayiotis Vafeas. "On the avascular evolution of an ellipsoidal tumour". En INTERNATIONAL CONFERENCE OF NUMERICAL ANALYSIS AND APPLIED MATHEMATICS (ICNAAM 2016). Author(s), 2017. http://dx.doi.org/10.1063/1.4992747.

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Zhang, Youan, Peng Li, Wenjie Zhang, Jie Wang y Kejie Zhang. "Non-ellipsoidal extended object tracking using PMBM filter". En 2023 3rd International Conference on Computer Vision and Pattern Analysis (ICCPA 2023), editado por Linlin Shen y Guoqiang Zhong. SPIE, 2023. http://dx.doi.org/10.1117/12.2684191.

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Shen, Jun, Heng Peng, Yanfang Tang, Xuemei Liu y Yinghua Liu. "Stress Analysis of Ellipsoidal Head With Heating Spiral". En ASME 2017 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/pvp2017-65494.

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The thermal load is one of important design condition that should be considered carefully in engineering practice. In most instances, the heat source is located inside the vessel, which causes a temperature gradient along the thickness, especially when the thickness is large. In this case, secondary stress should be considered and thermal ratcheting should be checked. In this paper, a thin-walled ellipsoidal head with heating spiral was studied. In this structure, temperature is uniformly distributed along the thickness but changes alternately between hot and cold along the meridional direction. This has a significant effect not only on the head itself but also on the nozzle. For the nozzle, its elastic support condition has been changed and then its stress distribution will also be changed. In this paper, several cases have been calculated and some laws are established. Finally, some useful conclusions and suggestions are proposed for engineering design.

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Noack, Benjamin, Joris Sijs y Uwe D. Hanebeck. "Algebraic analysis of data fusion with ellipsoidal intersection". En 2016 IEEE International Conference on Multisensor Fusion and Integration for Intelligent Systems (MFI). IEEE, 2016. http://dx.doi.org/10.1109/mfi.2016.7849515.

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Informes sobre el tema "Ellipsoidal analysis"

Batygin, Yuri K. Self-consistent Analysis of Three-dimensional Uniformly Charged Ellipsoid with Zero Emittance. Office of Scientific and Technical Information (OSTI), mayo de 2001. http://dx.doi.org/10.2172/784922.

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Warrick, Arthur W., Gideon Oron, Mary M. Poulton, Rony Wallach y Alex Furman. Multi-Dimensional Infiltration and Distribution of Water of Different Qualities and Solutes Related Through Artificial Neural Networks. United States Department of Agriculture, enero de 2009. http://dx.doi.org/10.32747/2009.7695865.bard.

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The project exploits the use of Artificial Neural Networks (ANN) to describe infiltration, water, and solute distribution in the soil during irrigation. It provides a method of simulating water and solute movement in the subsurface which, in principle, is different and has some advantages over the more common approach of numerical modeling of flow and transport equations. The five objectives were (i) Numerically develop a database for the prediction of water and solute distribution for irrigation; (ii) Develop predictive models using ANN; (iii) Develop an experimental (laboratory) database of water distribution with time; within a transparent flow cell by high resolution CCD video camera; (iv) Conduct field studies to provide basic data for developing and testing the ANN; and (v) Investigate the inclusion of water quality [salinity and organic matter (OM)] in an ANN model used for predicting infiltration and subsurface water distribution. A major accomplishment was the successful use of Moment Analysis (MA) to characterize “plumes of water” applied by various types of irrigation (including drip and gravity sources). The general idea is to describe the subsurface water patterns statistically in terms of only a few (often 3) parameters which can then be predicted by the ANN. It was shown that ellipses (in two dimensions) or ellipsoids (in three dimensions) can be depicted about the center of the plume. Any fraction of water added can be related to a ‘‘probability’’ curve relating the size of the ellipse (or ellipsoid) that contains that amount of water. The initial test of an ANN to predict the moments (and hence the water plume) was with numerically generated data for infiltration from surface and subsurface drip line and point sources in three contrasting soils. The underlying dataset consisted of 1,684,500 vectors (5 soils×5 discharge rates×3 initial conditions×1,123 nodes×20 print times) where each vector had eleven elements consisting of initial water content, hydraulic properties of the soil, flow rate, time and space coordinates. The output is an estimate of subsurface water distribution for essentially any soil property, initial condition or flow rate from a drip source. Following the formal development of the ANN, we have prepared a “user-friendly” version in a spreadsheet environment (in “Excel”). The input data are selected from appropriate values and the output is instantaneous resulting in a picture of the resulting water plume. The MA has also proven valuable, on its own merit, in the description of the flow in soil under laboratory conditions for both wettable and repellant soils. This includes non-Darcian flow examples and redistribution and well as infiltration. Field experiments were conducted in different agricultural fields and various water qualities in Israel. The obtained results will be the basis for the further ANN models development. Regions of high repellence were identified primarily under the canopy of various orchard crops, including citrus and persimmons. Also, increasing OM in the applied water lead to greater repellency. Major scientific implications are that the ANN offers an alternative to conventional flow and transport modeling and that MA is a powerful technique for describing the subsurface water distributions for normal (wettable) and repellant soil. Implications of the field measurements point to the special role of OM in affecting wettability, both from the irrigation water and from soil accumulation below canopies. Implications for agriculture are that a modified approach for drip system design should be adopted for open area crops and orchards, and taking into account the OM components both in the soil and in the applied waters.

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