Relevant bibliographies by topics / Approximation diffuse

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers

Academic literature on the topic 'Approximation diffuse'

Author: Grafiati
Published: 4 June 2021
Last updated: 18 September 2022

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Journal articles on the topic "Approximation diffuse"

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Rätz, Andreas, and Matthias Röger. "A new diffuse-interface approximation of the Willmore flow." ESAIM: Control, Optimisation and Calculus of Variations 27 (2021): 14. http://dx.doi.org/10.1051/cocv/2021013.

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Standard diffuse approximations of the Willmore flow often lead to intersecting phase boundaries that in many cases do not correspond to the intended sharp interface evolution. Here we introduce a new two-variable diffuse approximation that includes a rather simple but efficient penalization of the deviation from a quasi-one dimensional structure of the phase fields. We justify the approximation property by a Gamma convergence result for the energies and a matched asymptotic expansion for the flow. Ground states of the energy are shown to be one-dimensional, in contrast to the presence of sadd
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Nayroles, B., G. Touzot, and P. Villon. "Generalizing the finite element method: Diffuse approximation and diffuse elements." Computational Mechanics 10, no. 5 (1992): 307–18. http://dx.doi.org/10.1007/bf00364252.

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Bellettini, Giovanni, and Luca Mugnai. "Approximation of Helfrich's Functional via Diffuse Interfaces." SIAM Journal on Mathematical Analysis 42, no. 6 (2010): 2402–33. http://dx.doi.org/10.1137/09077549x.

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Petitta, Francesco, Augusto C. Ponce, and Alessio Porretta. "Approximation of diffuse measures for parabolic capacities." Comptes Rendus Mathematique 346, no. 3-4 (2008): 161–66. http://dx.doi.org/10.1016/j.crma.2007.12.002.

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Zhang, Hua, Feng Zhang, Qiang Fu, Zhongping Shen, and Peng Lu. "Two- and Four-Stream Combination Approximations for Computation of Diffuse Actinic Fluxes." Journal of the Atmospheric Sciences 67, no. 10 (2010): 3238–52. http://dx.doi.org/10.1175/2010jas3370.1.

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Abstract The δ-two- and four-stream combination approximations, which use a source function from the two-stream approximations and evaluate intensities in the four-stream directions, are formulated for the calculation of diffuse actinic fluxes. The accuracy and efficiency of the three computational techniques—the δ-two-stream approximations, the δ-two- and four-stream combination approximations based on various two-stream approaches, and the δ-four-stream approximation—have been investigated. The diffuse actinic fluxes are examined by considering molecular, aerosol, haze, and cloud scattering
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Osorio, Mauricio, та Donald French. "Error estimates for a multidimensional meshfree Galerkin method with diffuse derivatives and stabilization". Ingeniería y Ciencia 9, № 17 (2013): 53–76. http://dx.doi.org/10.17230/ingciecia.9.17.3.

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A meshfree method with diffuse derivatives and a penalty stabilization is developed. An error analysis for the approximation of the solution of a general elliptic differential equation, in several dimensions, with Neumann boundary conditions is provided. Theoretical and numerical results show that the approximation error and the convergence rate are better than the diffuse element method.
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Chamoret, Dominique, Alain Rassineux, Pierre Villon, and Jean-Michel Bergheau. "Régularisation d'une surface de contact par approximation diffuse." Revue Européenne des Éléments Finis 11, no. 2-4 (2002): 431–45. http://dx.doi.org/10.3166/reef.11.431-445.

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Zeng, Fanan. "Diffuse optical tomography based on a WKB approximation." Journal of Biomedical Optics 2, no. 4 (1997): 426. http://dx.doi.org/10.1117/12.285090.

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Smith, Penelope H., and Theodore F. Smith. "Approximation of within-stack absorptances for diffuse irradiation." Solar Energy 37, no. 2 (1986): 175–78. http://dx.doi.org/10.1016/0038-092x(86)90074-5.

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Lukyanov, S. V. "Diffuse relaxation approximation in a heated Fermi system." International Journal of Modern Physics E 30, no. 07 (2021): 2150060. http://dx.doi.org/10.1142/s0218301321500609.

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An expression for the two-particle relaxation time of collective excitations on a distorted Fermi surface in the diffusion approach to kinetic theory is obtained. The general case of momentum-dependent diffusion and drift coefficients is considered. The temperature dependence of the obtained expression is established.
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Dissertations / Theses on the topic "Approximation diffuse"

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Savignat, Jean-Michel. "Approximation diffuse Hermite et ses applications." Phd thesis, École Nationale Supérieure des Mines de Paris, 2000. http://pastel.archives-ouvertes.fr/pastel-00577930.

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De nombreuses techniques de résolution d'équations aux dérivées partielles sans maillage ont été développées dans la dernière décennie, proposant une alternative attrayante lorsque les éléments finis atteignent leurs limites. Notre travail se concentre sur l'étude de l'approximation diffuse, de ses applications au lissage et a la résolution des équations différentielles : les éléments diffus. Cependant, les solutions proposées s'appliquent aussi à d'autres méthodes et de nombreux résultats numériques illustrent chaque développement théorique. Dans un premier temps, nous étudions les techniques
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Laouar, Tayeb. "Contribution à l'étude de l'approximation diffuse : auto-adaptativité en éléments diffus." Compiègne, 1996. http://www.theses.fr/1996COMPD891.

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Ce travail constitue une contribution dans le développement des moyens de résolution des systèmes d'Équations aux Dérivées Partielles (EDP) en utilisant la méthode d'approximation diffuse (A. D. ). Il s'articule autour du thème suivant : Calcul auto-adaptatif en éléments diffus sur la résolution des EDP pour des problèmes mécaniques. Tout d'abord, nous nous sommes attachés à souligner les principes généraux ainsi que les choix fondamentaux définissant l'A. D. (choix des fonctions poids, choix de la base,. . . ). Ensuite, étant donné que l'A. D. N'est pas interpolant, nous avons introduit la no
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Marih, Mohamed. "Mise en œuvre de l'approximation diffuse et de la méthode des éléments diffus pour la résolution des problèmes de mécanique." Compiègne, 1994. http://www.theses.fr/1994COMPD767.

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Un premier objectif de cette thèse consiste à préciser les bases et montrer les difficultés d'une nouvelle méthode d'approximation "approximation diffuse" (présentation algébrique, approche statistique, unisolvance, fonctions d'atténuation,. . . ), ainsi que les algorithmes de sa mise en œuvre pratique. On s'appuie ici sur la méthode des plus proches voisins. Des applications aux problèmes mécaniques vont permettre de procéder ensuite à une étude paramétrique, afin d'évaluer l'influence des différents paramètres de cette approximation (nombre de voisins, ordre d'approximation, fonctions d'atté
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Reiten, Andreas Lønning. "Diffuse Small Angle X-Ray Scattering From Thin Film Structures In the Distorted Wave Born Approximation." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for fysikk, 2011. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-13379.

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The differential scattering cross section for diffuse scattering of X-rays from thinfilm structures is discussed within the framework of the distorted wave Born ap-proximation (DWBA). In contrast to the standard Born approximation (BA), thedistorted wave approach succeeds in calculating scattering from surfaces near thecritical angle of reflection. The method is particularly useful for studying averagesurface properties.Compromises made in the derivation of the model substantially simplify thefinal expression, but also limit its range of validity, which depends on the surfaceroot mean square r
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Prax, Christian. "Contribution à la résolution numérique de problèmes de mécanique des fluides et de thermique par approximation diffuse." Poitiers, 1996. http://www.theses.fr/1996POIT2251.

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Le travail presente ici entre dans le cadre general du developpement de methodes numeriques performantes pour la resolution des problemes de thermique et d'ecoulements en geometries complexes. Nous avons choisi pour cela d'utiliser l'approximation diffuse qui est une technique permettant d'estimer les derivees d'un champ a partir de ses valeurs aux nuds d'un nuage de points. Son avantage principal reside dans le fait qu'elle ne necessite pas de maillages en elements finis geometriques. A l'heure actuelle, il n'existe pas de travaux utilisant cette approximation pour la resolution des equations
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Mokhtarzadeh, M. R. "A general global approximation method for the solution of boundary value problems." Thesis, Loughborough University, 1998. https://dspace.lboro.ac.uk/2134/14478.

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A general global approximation scheme is developed and its generality is demonstrated by the derivation of classical Lagrange and Hermite interpolation and finite difference and finite element approximations as its special cases. It is also shown that previously reported general approximation techniques which use the idea of moving least square are also special cases of the present method. The combination of the developed general global approximation technique with the weighted residual methods provides a very powerful scheme for the solution of the boundary value problems formulated in terms
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Zraket, David Camus. "Testing the value of the one-dimensional transport equation with a diffuse light approximation in predicting light flux in tissue." Thesis, Massachusetts Institute of Technology, 1987. http://hdl.handle.net/1721.1/14649.

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Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 1987.<br>Title as it appears in M.I.T. Graduate List, Sept. 1987: Testing the predictive value of the one-dimensional transport equation with a diffuse light approximation in predicting light flux in tissue.<br>Bibliography: leaf 37.<br>by David Camus Zraket.<br>M.S.
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Hou, Yuliang. "Modelling of plasticity and fracture behaviors of dual-phase steel." Thesis, Compiègne, 2016. http://www.theses.fr/2016COMP2302/document.

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L’acier à double phase (DP) a été développé par l'industrie automobile pour le but de réduire le poids, l'amélioration de la performance de la sécurité et l'efficacité énergétique. Habituellement, l'acier DP contient des îlots de martensite dure noyée dans une matrice de ferrite doux. La synergie entre ces deux phases avec la microstructure inhomogène présente d'excellentes propriétés mécaniques. Les propriétés mécaniques (comportements de plasticité et de dégâts) d'acier DP sont principalement dérivés de sa microstructure, par exemple, la fraction de volume, la taille, la distribution et la m
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Zhang, Peipei. "Diffuse response surface model based on advancing latin hypercube patterns for reliability-based design optimization of ultrahigh strength steel NC milling parameters." Compiègne, 2011. http://www.theses.fr/2011COMP1949.

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Puisque les incertitudes des paramètres de systèmes mécaniques entrainent la variabilité de la performance du produit, les systèmes optimisés sans prendre en compte les incertitudes peuvent présenter le risque de défaillance. L'optimisation fiabiliste (RBDO) focalise ainsi l'attention des ingénieurs et des chercheurs. Cependant, les méthodes habituelles de RBDO présentent un coût informatique excessif. Donc, afin d'améliorer l'efficacité informatique de la résolution de problèmes de RBDO, il est naturel de faire appel à des approches basées sur les surfaces de réponse (RSM). Dans ce travail, n
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Raghavan, Balaji. "Towards simulteaneous meta-modeling for both the output and input spaces in the context of design shape optimization unsin asynchronous high-performance computing." Compiègne, 2012. http://www.theses.fr/2012COMP2042.

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L'optimisation structurelle dans l'industrie est souvent une tâche bien plus redoutable que ce qui était prévu par les équipes de recherche et développement. Les calculs de haute fidélité peuvent augmenter le temps CPU, ce qui nous ramène vers l'utilisation de grilles de calcul, et alors la recherche sur l'adaptation de solveurs numériques et des algorithmes d'optimisation sur les grilles de calculs. Le problème de temps CPU pour un résultat assez réaliste a aussi donné lieu à la recherche sur des stratégies de réduction de modèle pour obtenir une évaluation approximative dans une fraction de
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Books on the topic "Approximation diffuse"

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Castro, Guillermo. El negocio jurídico, la declaración de voluntad y el ordenamiento jurídico. Editorial Universidad Católica de Colombia, 2020. http://dx.doi.org/10.14718/9789585133310.2020.

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Uwe Wesel, professor of law at the Free University of Berlin, expressed in several of his writings an interesting thought: more than the law of obligations (Schuldrecht) the law of contracts (Vertragsrecht) is a better metadiscourse to reread and interpret the spectrum of The legal, which could even give an accurate account of the history of Western law. From the origins of the Greek civilization and to the Lisbon agreement, the contract was the institute that most connected the legal with the reasonableness, fairness, proportionality, justice and the conservative and protective sense of the c
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Melo, Felipe Athayde Lins de. A burocracia penitenciarista: Estudo sobre a configuração da gestão prisional no Brasil. Brazil Publishing, 2020. http://dx.doi.org/10.31012/978-65-5861-207-0.

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This book deals with the emergence of prison management in Brazil, understanding it as an effect of forces between different orders of the penitentiary apparatus, in which the Justice and Security bundles are highlighted, based on disputes and accommodations between actors, institutions and perspectives that, within each order or in their external interactions, configure the dynamics of the Brazilian Penitentiary Administration, within which a penitentiary bureaucracy is produced, specialized in mediating the conflicts and the approximations between the orders. In recent times, these mediation
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Acta Numerica 1998. Cambridge University Press, 1999.

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Book chapters on the topic "Approximation diffuse"

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Caudron, R., D. Le Bolloc’h, A. Finel, and M. Barrachin. "Diffuse Scattering of Neutrons in Ni3V and Pt3 V: Test of the Gamma Expansion Method Approximation in a Degenerate Case." In Theory and Applications of the Cluster Variation and Path Probability Methods. Springer US, 1996. http://dx.doi.org/10.1007/978-1-4613-0419-7_13.

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Wheeler, V. M., and Kumar K. Tamma. "Ballistic-Diffusive Approximation: A New Look." In Encyclopedia of Thermal Stresses. Springer Netherlands, 2014. http://dx.doi.org/10.1007/978-94-007-2739-7_749.

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Lynch, Christopher, and Catherine Meadows. "Sound Approximations to Diffie-Hellman Using Rewrite Rules." In Information and Communications Security. Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-540-30191-2_21.

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Shparlinski, Igor. "Polynomial Approximation and Arithmetic Complexity of the Diffie—Hellman Key." In Number Theoretic Methods in Cryptography. Birkhäuser Basel, 1999. http://dx.doi.org/10.1007/978-3-0348-8664-2_8.

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Shparlinski, Igor. "Polynomial Approximation and Arithmetic Complexity of the Diffie-Hellman Secret Key." In Cryptographic Applications of Analytic Number Theory. Birkhäuser Basel, 2003. http://dx.doi.org/10.1007/978-3-0348-8037-4_13.

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"The Point Source Approximation." In Principles of Diffuse Light Propagation. WORLD SCIENTIFIC, 2012. http://dx.doi.org/10.1142/9789814293860_0007.

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"Fick’s Law and The Diffusion Approximation." In Principles of Diffuse Light Propagation. WORLD SCIENTIFIC, 2012. http://dx.doi.org/10.1142/9789814293860_0004.

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Boothroyd, Andrew T. "Diffraction in the Static Approximation." In Principles of Neutron Scattering from Condensed Matter. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780198862314.003.0002.

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The basic principles of crystallography are reviewed, including the lattice, basis and reciprocal lattice. The Bragg diffraction law and Laue equation, which describe coherent scattering from a crystalline material, are derived, and the structure factor and differential cross-section are obtained in the static approximation. It is explained how the presence of defects, short-range order, and reduced dimensionality causes diffuse scattering. For non-crystalline materials, such as liquids and glasses, the pair distribution function and density-density correlation function are introduced, and their relation to the static structure factor established. For molecular fluids, the form factor is defined and calculated for a diatomic molecule, and the separation of intra- and inter-molecular scattering is discussed. The principles of small-angle neutron scattering are described.
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Boothroyd, Andrew T. "Magnetic Diffraction." In Principles of Neutron Scattering from Condensed Matter. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780198862314.003.0007.

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The basic concepts of magnetic order in crystals are reviewed, including magnetic unit cells, propagation vectors and magnetic domains. Some commonly-occuring magnetic structures are discussed, such as ferromagnets, antiferromagnets, ferrimagnets, and noncollinear and incommensurate magnetic structures. The differential cross-section for neutron diffraction from a magnetic structure is derived, and the magnetic structure factor is defined. The use of neutron polarization analysis, including spherical neutron polarimetry, in the determination of magnetic structures and of the spatial distribution of magnetization is described in detail. Diffuse magnetic scattering due to magnetic frustration and magnetic phase transitions is discussed, and the relevance of the static approximation is explained. Neutron diffraction studies of nuclear spin order are described.
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Coppens, Philip. "The Effect of Thermal Vibrations on the Intensities of the Diffracted Beams." In X-Ray Charge Densities and Chemical Bonding. Oxford University Press, 1997. http://dx.doi.org/10.1093/oso/9780195098235.003.0004.

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The atoms in a crystal are vibrating with amplitudes determined by the force constants of the crystal’s normal modes. This motion can never be frozen out because of the persistence of zero-point motion, and it has important consequences for the scattering intensities. Since X-ray scattering (and, to a lesser extent, neutron scattering) is a very fast process, taking place on a time scale of 10−18 s, the photon-matter interaction time is much shorter than the period of a lattice vibration, which is of the order Thus, the recorded X-ray scattering pattern is the sum over the scattering of a large number of 1/v, or ≈10−13s. instantaneous states of the crystal. To an extremely good approximation, the scattering averaged over the instantaneous distributions is equivalent to the scattering of the time-averaged distribution of the scattering matter (Stewart and Feil 1980). The structure factor expression for coherent elastic Bragg scattering of X-rays may therefore be written in terms 〈ρ(r)〉, of the thermally averaged electron density: . . . F(H)=∫unit cell〈ρ(r)〉 exp (2πi H ·r) dr (2.1) . . . The smearing of the electron density due to thermal vibrations reduces the intensity of the diffracted beams, except in the forward |S| = 0 direction, for which all electrons scatter in phase, independent of their distribution. The reduction of the intensity of the Bragg peaks can be understood in terms of the diffraction pattern of a more diffuse electron distribution being more compact, due to the inverse relation between crystal and scattering space, discussed in chapter 1. The reduction in intensity due to thermal motion is accompanied by an increase in the incoherent elastic scattering, ensuring conservation of energy. In this respect, thermal motion is much like disorder, with the Bragg intensities representing the average distribution, and the deviations from the average appearing as a continuous, though not uniform, background, generally referred to as thermal diffuse scattering or TDS. A crystal with n atoms per unit cell has 3nN degrees of freedom, N being the number of unit cells in the crystal.
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Conference papers on the topic "Approximation diffuse"

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Ripoll, Jorge, and Vasilis Ntziachristos. "The Kirchhoff Approximation in diffuse optical tomography." In Biomedical Topical Meeting. OSA, 2002. http://dx.doi.org/10.1364/bio.2002.sub6.

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Patil, Nishigandha, та Naren Naik. "3D fluorescence optical tomography with directed sources using the δ-SP3 approximation". У Diffuse Optical Spectroscopy and Imaging VIII, редактори Davide Contini, Yoko Hoshi та Thomas D. O'Sullivan. SPIE, 2021. http://dx.doi.org/10.1117/12.2615393.

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Chu, Michael, and Hamid Dehghani. "Diffuse Optical Tomography based on Simplified Spherical Harmonics Approximation." In Biomedical Optics. OSA, 2010. http://dx.doi.org/10.1364/biomed.2010.bsue8.

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Kwon, Kiwoon, and Beop-Min Kim. "Second order inverse born approximation for diffuse optical tomography." In Biomedical Optics (BiOS) 2008, edited by Fred S. Azar and Xavier Intes. SPIE, 2008. http://dx.doi.org/10.1117/12.762488.

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Quesada, Carlos, Pierre Villon, and Anne-Virginie Salsac. "Identification of the mechanical properties of microcapsules using diffuse approximation." In 2018 13th Annual Conference on System of Systems Engineering (SoSE). IEEE, 2018. http://dx.doi.org/10.1109/sysose.2018.8428739.

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Tarvainen, Tanja, Ville Kolehmainen, Simon R. Arridge, and Jari P. Kaipio. "Utilising Approximation Error Modelling in Linear Reconstruction in Diffuse Optical Tomography." In Biomedical Optics. OSA, 2012. http://dx.doi.org/10.1364/biomed.2012.btu3a.41.

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Kolehmainen, Ville, Martin Schweiger, Ilkka Nissila¨, Tanja Tarvainen, Simon R. Arridge, and Jari P. Kaipio. "Approximation Errors and Model Reduction in Three-Dimensional Diffuse Optical Tomography." In Biomedical Optics. OSA, 2012. http://dx.doi.org/10.1364/biomed.2012.btu3a.5.

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Naglič, Peter, Luka Vidovič, Matija Milanič, Lise L. Randeberg, and Boris Majaron. "Applicability of diffusion approximation in analysis of diffuse reflectance spectra from healthy human skin." In 1st International Conference "Biophotonics Riga 2013", edited by Janis Spigulis and Ilona Kuzmina. SPIE, 2013. http://dx.doi.org/10.1117/12.2044706.

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Beechem, Thomas, and Samuel Graham. "Estimating the Effects of Interface Disorder on the Thermal Boundary Resistance Using a Virtual Crystal Approximation." In ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-14161.

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An analytical method is presented to estimate the effects of structural disorder on the thermal boundary resistance (TBR) between 2 materials. The current method is an extension of the diffuse mismatch model (DMM) where the interface is modeled as a virtual crystal of finite thickness with properties derived from those of the constituent materials. Using this virtual crystal extension, the predictive capabilities of the diffuse mismatch method are greatly increased with added insight into the sensitivity of materials to interface quality.
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Hervé, Lionel, Anabela Da Silva, Anne Koenig, et al. "Improvement of Fluorescence Tomography Reconstructions with Higher Order Born Approximation of Diffuse Photon Density Waves." In Biomedical Topical Meeting. OSA, 2006. http://dx.doi.org/10.1364/bio.2006.sh70.

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