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Littérature scientifique sur le sujet « Singular drift »

Auteur : Grafiati
Publié le 10 mai 2025

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Articles de revues sur le sujet "Singular drift"

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Jakubowski, Tomasz. « Fractional Laplacian with singular drift ». Studia Mathematica 207, no 3 (2011) : 257–73. http://dx.doi.org/10.4064/sm207-3-3.

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Bass, Richard F., et Zhen-Qing Chen. « Brownian motion with singular drift ». Annals of Probability 31, no 2 (2003) : 791–817. http://dx.doi.org/10.1214/aop/1048516536.

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Kim, Panki, et Renming Song. « Stable process with singular drift ». Stochastic Processes and their Applications 124, no 7 (juillet 2014) : 2479–516. http://dx.doi.org/10.1016/j.spa.2014.03.006.

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REZNIK, GREGORY, et ZIV KIZNER. « Two-layer quasi-geostrophic singular vortices embedded in a regular flow. Part 2. Steady and unsteady drift of individual vortices on a beta-plane ». Journal of Fluid Mechanics 584 (25 juillet 2007) : 203–23. http://dx.doi.org/10.1017/s0022112007006404.

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Drift of individual β-plane vortices confined to one layer of a two-layer fluid under the rigid-lid condition is considered. For this purpose, the theory of two-layer quasi-geostrophic singular vortices is employed. On a β-plane, any non-zonal displacement of a singular vortex results in the development of a regular flow. An individual singular β-plane vortex cannot be steady on its own: the vortex moves coexisting with a regular flow, be the drift steady or not. In this paper, both kinds of drift of a singular vortex are considered. A new steady exact solution is presented, a hybrid regular–singular modon. This hybrid modon consists of a dipole component and a circularly symmetric rider. The dipole is regular, and the rider is a superposition of the singular vortex and a regular circularly symmetric field. The unsteady drift of a singular vortex residing in one of the layers is considered under the condition that, at the initial instant, the regular field is absent. The development of barotropic and baroclinic regular β-gyres is examined. Whereas the barotropic and baroclinic modes of the singular vortex are comparable in magnitudes, the baroclinic β-gyres attenuate with time, making the trajectory of the vortex close to that of a barotropic monopole on a β-plane.
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Blanchard, Philippe, et Simon Golin. « Diffusion processes with singular drift fields ». Communications in Mathematical Physics 109, no 3 (septembre 1987) : 421–35. http://dx.doi.org/10.1007/bf01206145.

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Rutkowski, Marek. « Stochastic differential equations with singular drift ». Statistics & ; Probability Letters 10, no 3 (août 1990) : 225–29. http://dx.doi.org/10.1016/0167-7152(90)90078-l.

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Kinzebulatov, D., et K. R. Madou. « Stochastic equations with time-dependent singular drift ». Journal of Differential Equations 337 (novembre 2022) : 255–93. http://dx.doi.org/10.1016/j.jde.2022.07.042.

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Jin, Peng. « Brownian Motion with Singular Time-Dependent Drift ». Journal of Theoretical Probability 30, no 4 (2 mai 2016) : 1499–538. http://dx.doi.org/10.1007/s10959-016-0687-3.

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Labed, Saloua. « MAXIMUM PRINCIPLE FOR SINGULAR CONTROL PROBLEMS OF SYSTEMS DRIVEN BY MARTINGALE MEASURES ». Advances in Mathematics : Scientific Journal 12, no 1 (23 janvier 2023) : 193–216. http://dx.doi.org/10.37418/amsj.12.1.13.

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We provide necessary optimality conditions for singular controlled stochastic differential equations driven by an orthogonal continuous martingale measure. The control is allowed to enter both the drift and diffusion coefficient and has two components, the first being relaxed and the second singular, the domain of the first control does not need to be convex, and for the relaxing method, we show by a counter-example that replacing the drift and diffusion coefficients by their relaxed counterparts does not define a true relaxed control problem. The maximum principle for these systems is established by means of spike variation techniques on the relaxed part of the control and a convex perturbation on the singular one. Our result is a generalization of Peng's maximum principle to singular control problems.
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NISHIBATA, SHINYA, NAOTAKA SHIGETA et MASAHIRO SUZUKI. « ASYMPTOTIC BEHAVIORS AND CLASSICAL LIMITS OF SOLUTIONS TO A QUANTUM DRIFT-DIFFUSION MODEL FOR SEMICONDUCTORS ». Mathematical Models and Methods in Applied Sciences 20, no 06 (juin 2010) : 909–36. http://dx.doi.org/10.1142/s0218202510004477.

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This paper discusses a time global existence, asymptotic behavior and a singular limit of a solution to the initial boundary value problem for a quantum drift-diffusion model of semiconductors over a one-dimensional bounded domain. Firstly, we show a unique existence and an asymptotic stability of a stationary solution for the model. Secondly, it is shown that the time global solution for the quantum drift-diffusion model converges to that for a drift-diffusion model as the scaled Planck constant tends to zero. This singular limit is called a classical limit. Here these theorems allow the initial data to be arbitrarily large in the suitable Sobolev space. We prove them by applying an energy method.
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Thèses sur le sujet "Singular drift"

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Kirsch, Josef. « Boundary value problems for elliptic operators with singular drift terms ». Thesis, University of Edinburgh, 2012. http://hdl.handle.net/1842/7874.

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Let Ω be a Lipschitz domain in Rᴺ,n ≥ 3, and L = divA∇ - B∇ be a second order elliptic operator in divergence form with real coefficients such that A is a bounded elliptic matrix and the vector field B ɛ L∞loc(Ω) is divergence free and satisfies the growth condition dist(X,∂Ω)|B(X)|≤ ɛ1 for ɛ1 small in a neighbourhood of ∂Ω. For these elliptic operators we will study on the basis of the theory for elliptic operators without drift terms the Dirichlet problem for boundary data in Lp(∂Ω), 1 < p < ∞, and the regularity problem for boundary data in W¹,ᵖ(∂Ω) and HS¹. The main result of this thesis is that the solvability of the regularity problem for boundary data in HS1 implies the solvability of the adjoint Dirichlet problem for boundary data in Lᵖ'(∂Ω) and the solvability of the regularity problem with boundary data in W¹,ᵖ(∂Ω for some 1 < p < ∞. In [KP93] C.E. Kenig and J. Pipher have proven for elliptic operators without drift terms that the solvability of the regularity problem with boundary data in W¹,ᵖ(∂Ω) implies the solvability with boundary data in HS1. Thus the result of C.E. Kenig and J. Pipher and our main result complement a result in [DKP10], where it was shown for elliptic operators without drift terms that the Dirichlet problem with boundary data in BMO is solvable if and only if it is solvable for boundary data in Lᵖ(∂Ω) for some 1 < p < ∞. In order to prove the main result we will prove for the elliptic operators L the existence of a Green's function, the doubling property of the elliptic measure and a comparison principle for weak solutions, which are well known results for elliptic operators without drift terms. Moreover, the solvability of the continuous Dirichlet problem will be established for elliptic operators L = div(A∇+B)+C∇+D with B,C,D ɛ L∞loc(Ω) such that in a small neighbourhood of ∂Ω we have that dist(X,∂Ω)(|B(X)| + |C(X)| + |D(X)|) ≤ ɛ1 for ɛ1 small and that the vector field B satisfies |∫B∇Ø| ≤ C∫|∇Ø| for all Ø ɛ Wₒ¹'¹ of that neighbourhood.
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Lühe, Katharina von der [Verfasser], et Michael [Akademischer Betreuer] Röckner. « Pathwise uniqueness for stochastic differential equations with singular drift and nonconstant diffusion / Katharina von der Lühe ; Betreuer : Michael Röckner ». Bielefeld : Universitätsbibliothek Bielefeld, 2017. http://d-nb.info/1124590684/34.

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Haress, El Mehdi. « Numerical approximation and long-time behaviour of some singular stochastic (partial) differential equations ». Electronic Thesis or Diss., université Paris-Saclay, 2024. http://www.theses.fr/2024UPASM038.

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On explore l'approximation numérique et le comportement en temps long de certaines équations stochastiques dirigées par des termes de dérive dissipatifs et/ou distributionnels.Premièrement, les équations différentielles stochastiques (EDS) avec un mouvement brownien fractionnaire (mBf) et une dérive distributionnelle sont étudiées. La convergence d'un schéma d'Euler modéré est quantifiée. Des techniques similaires sont appliquées à l'équation de la chaleur stochastique (SHE) avec un bruit blanc spatio-temporel et un terme de réaction distributionnel, et les mêmes résultats sont obtenus pour un schéma d'Euler modéré avec des différences finies.Deuxièmement, l'attention se porte sur les EDS avec un mBf et une dérive dissipative, établissant, dans le régime en temps long, la régularité presque-sûre des solutions et leurs moyennes ergodiques par rapport au temps et au paramètre de Hurst. Ces résultats sont appliqués dans un contexte statistique pour estimer les paramètres des équations à travers une approximation de leurs mesures invariantes.Enfin, on considère des termes de réaction dissipatifs et distributionnels dans SHE, présentant des résultats préliminaires dans le régime en temps long, le caractère bien-posé de l'équation est prouvé et les moments de la solution sont uniformément bornés dans le temps
In this thesis, we explore the numerical approximation and long-term behavior of certain stochastic equations driven by dissipative and/or distributional drift terms.Firstly, stochastic differential equations (SDEs) with fractional Brownian motion (fBm) and distributional drift are studied. The convergence of a tamed-Euler scheme is quantified. Similar techniques are applied to the stochastic heat equation (SHE) with space-time white noise and a distributional reaction term, and the same results are obtained for a tamed-Euler scheme with finite differences.Secondly, the focus shifts to SDEs with fBm and dissipative drift, establishing, in the long-term regime, the almost-sure regularity of solutions and their ergodic means with respect to time and the Hurst parameter. These results are applied in a statistical context to estimate the parameters of the equations through an approximation of their invariant measures.Finally, we combine dissipative and distributional reaction terms in SHE, presenting preliminary results in the long-term regime, the well-posedness of the equation is proven and the moments of the solution are uniformly bounded over time
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Barrasso, Adrien. « Decoupled mild solutions of deterministic evolution problemswith singular or path-dependent coefficients, represented by backward SDEs ». Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLY009/document.

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Cette thèse introduit une nouvelle notion de solution pour des équationsd'évolution non-linéaires déterministes, appellées solutionsmild découplées.Nous revisitons les liens entre équations différentielles rétrogrades(EDSRs) markoviennes browniennes et EDPsparaboliques semilinéaires en montrant que, sous de très faibles hypothèses,les EDSRs produisent une unique solution mild découplée d'une EDP.Nous étendons ce résultat à de nombreuses autres équations déterministestelles que des Pseudo-EDPs, des Equations Intégrales aux Dérivées Partielles(EIDPs), des EDPs à drift distributionnel, ou des E(I)DPs à dépendancetrajectorielle. Les solutions de ces équations sont représentées via des EDSRs qui peuvent être sans martingale de référence, ou dirigées par des martingales cadlag. En particulier, cette thèse résout le problème d'identification,qui consiste, dans le cas classique d'une EDSR markovienne brownienne, à donner un sens analytique au processus Z, second membre de la solution (Y,Z) de l'EDSR. Dans la littérature, Y détermine en général une solution de viscosité de l'équation déterministe et ce problème d'identification n'est résolu que quand cette solution de viscosité a un minimum de régularité. Notre méthode permet de résoudre ce problème même dans le cas général d'EDSRs à sauts (non nécéssairement markoviennes)
This thesis introduces a new notion of solution for deterministic non-linear evolution equations, called decoupled mild solution.We revisit the links between Markovian Brownian Backward stochastic differential equations (BSDEs) and parabolic semilinear PDEs showing that under very mild assumptions, the BSDEs produce a unique decoupled mild solution of some PDE.We extend this result to many other deterministic equations such asPseudo-PDEs, Integro-PDEs, PDEs with distributional drift or path-dependent(I)PDEs. The solutions of those equations are represented throughBSDEs which may either be without driving martingale, or drivenby cadlag martingales. In particular this thesis solves the so calledidentification problem, which consists, in the case of classical Markovian Brownian BSDEs, to give an analytical meaning to the second component Z ofthe solution (Y,Z) of the BSDE. In the literature, Y generally determinesa so called viscosity solution and the identification problem is only solved when this viscosity solution has a minimal regularity.Our method allows to treat this problem even in the case of general (even non-Markovian) BSDEs with jumps
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Barrasso, Adrien. « Decoupled mild solutions of deterministic evolution problemswith singular or path-dependent coefficients, represented by backward SDEs ». Electronic Thesis or Diss., Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLY009.

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Cette thèse introduit une nouvelle notion de solution pour des équationsd'évolution non-linéaires déterministes, appellées solutionsmild découplées.Nous revisitons les liens entre équations différentielles rétrogrades(EDSRs) markoviennes browniennes et EDPsparaboliques semilinéaires en montrant que, sous de très faibles hypothèses,les EDSRs produisent une unique solution mild découplée d'une EDP.Nous étendons ce résultat à de nombreuses autres équations déterministestelles que des Pseudo-EDPs, des Equations Intégrales aux Dérivées Partielles(EIDPs), des EDPs à drift distributionnel, ou des E(I)DPs à dépendancetrajectorielle. Les solutions de ces équations sont représentées via des EDSRs qui peuvent être sans martingale de référence, ou dirigées par des martingales cadlag. En particulier, cette thèse résout le problème d'identification,qui consiste, dans le cas classique d'une EDSR markovienne brownienne, à donner un sens analytique au processus Z, second membre de la solution (Y,Z) de l'EDSR. Dans la littérature, Y détermine en général une solution de viscosité de l'équation déterministe et ce problème d'identification n'est résolu que quand cette solution de viscosité a un minimum de régularité. Notre méthode permet de résoudre ce problème même dans le cas général d'EDSRs à sauts (non nécéssairement markoviennes)
This thesis introduces a new notion of solution for deterministic non-linear evolution equations, called decoupled mild solution.We revisit the links between Markovian Brownian Backward stochastic differential equations (BSDEs) and parabolic semilinear PDEs showing that under very mild assumptions, the BSDEs produce a unique decoupled mild solution of some PDE.We extend this result to many other deterministic equations such asPseudo-PDEs, Integro-PDEs, PDEs with distributional drift or path-dependent(I)PDEs. The solutions of those equations are represented throughBSDEs which may either be without driving martingale, or drivenby cadlag martingales. In particular this thesis solves the so calledidentification problem, which consists, in the case of classical Markovian Brownian BSDEs, to give an analytical meaning to the second component Z ofthe solution (Y,Z) of the BSDE. In the literature, Y generally determinesa so called viscosity solution and the identification problem is only solved when this viscosity solution has a minimal regularity.Our method allows to treat this problem even in the case of general (even non-Markovian) BSDEs with jumps
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Ling, Chengcheng [Verfasser]. « Stochastic differential equations with singular drifts and multiplicative noises / Chengcheng Ling ». Bielefeld : Universitätsbibliothek Bielefeld, 2020. http://d-nb.info/1206592184/34.

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Flandoli, Franco, et Michael Högele. « A solution selection problem with small stable perturbations ». Universität Potsdam, 2014. http://opus.kobv.de/ubp/volltexte/2014/7120/.

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The zero-noise limit of differential equations with singular coefficients is investigated for the first time in the case when the noise is a general alpha-stable process. It is proved that extremal solutions are selected and the probability of selection is computed. Detailed analysis of the characteristic function of an exit time form on the half-line is performed, with a suitable decomposition in small and large jumps adapted to the singular drift.
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BENABDALLAH, MOHSINE. « Equations differentielles stochastiques avec drift singulier : problemes d'existence, d'unicite et developpements asymptotiques en temps petits lorsque les coefficients sont reguliers par morceaux ». Paris 6, 1989. http://www.theses.fr/1989PA066040.

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En premiere partie, on etudie des equations differentielles stochastiques avec un drift singulier dependant du temps. Dans le cas unidimensionnel, l'existence et l'unicite fortes de la solution y(t) sont demontrees. Dans le cas d'une dimension superieure on peut avoir des reflexions partielles a la surface. En deuxieme partie on etablit un developpement de taylor de la solution d'une equation differentielle stochastique a coefficients reguliers par morceaux, qui mene a un developpement asymptotique de l'esperance de u(y(t)) ou u est une fonction reguliere par morceaux
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Livres sur le sujet "Singular drift"

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Baur, Benedict. Elliptic Boundary Value Problems and Construction of Lp-Strong Feller Processes with Singular Drift and Reflection. Wiesbaden : Springer Fachmedien Wiesbaden, 2014. http://dx.doi.org/10.1007/978-3-658-05829-6.

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Elliptic Boundary Value Problems and Construction of Lp-Strong Feller Processes with Singular Drift and Reflection. Springer Spektrum, 2014.

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Baur, Benedict. Elliptic Boundary Value Problems and Construction of Lp-Strong Feller Processes with Singular Drift and Reflection. Spektrum Akademischer Verlag GmbH, 2014.

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The Dirichlet Problem for Parabolic Operators With Singular Drift Terms (Memoirs of the American Mathematical Society). American Mathematical Society, 2001.

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Gorfinkel, Elena. Wanda. Bloomsbury Publishing Plc, 2025. https://doi.org/10.5040/9781839023071.

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Actor-turned-writer/director Barbara Loden's only feature film,Wanda(1970), tells the story of an alienated working-class woman, Wanda Goronski (played by Loden), who abandons her life as a coal miner’s wife and mother, electing instead to drift. Bracing in its realist texture and proto-feminist in its sensibility, it received critical acclaim upon release, winning the Critics’ Prize at the Venice Film Festival in 1970. Today,Wandais considered one of the most notable films made by a woman director and a core work of American independent cinema. Elena Gorfinkel's study of this singular film traces Loden's creative process and unconventional approach to filmmaking. Drawing on archival sources, including scripts, interviews, production records, oral history, and previously unseen ephemera, she examines the film’s de-dramatised aesthetic, one that rebukes the artifice and “slickness” of Hollywood. Gorfinkel considers Loden’s craft in her framing of cinematic time, manipulation of gesture, voice, and posture, narrative ellipsis, and in her use of location and non-professional actors. Providing an account ofWanda'sexhibition and reception in the 1970s and after, she traces the film's feminist legacies, and its lasting influence on contemporary filmmakers, artists and writers.
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Chapitres de livres sur le sujet "Singular drift"

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Aebi, Robert. « Diffusions with Singular Drift ». Dans Schrödinger Diffusion Processes, 23–54. Basel : Birkhäuser Basel, 1996. http://dx.doi.org/10.1007/978-3-0348-9027-4_2.

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Kinzebulatov, Damir. « Form-Boundedness and SDEs with Singular Drift ». Dans Kolmogorov Operators and Their Applications, 147–261. Singapore : Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-97-0225-1_7.

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Okazawa, Noboru, et Motohiro Sobajima. « L p -Theory for Schrödinger Operators Perturbed by Singular Drift Terms ». Dans Springer INdAM Series, 401–18. Cham : Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-11406-4_18.

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Marinelli, Carlo, et Luca Scarpa. « On the Well-Posedness of SPDEs with Singular Drift in Divergence Form ». Dans Stochastic Partial Differential Equations and Related Fields, 225–35. Cham : Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-74929-7_12.

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Würsch, Maxime, Dimitri Percia David et Alain Mermoud. « Monitoring Emerging Trends in LLM Research ». Dans Large Language Models in Cybersecurity, 153–61. Cham : Springer Nature Switzerland, 2024. http://dx.doi.org/10.1007/978-3-031-54827-7_17.

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AbstractEstablished methodologies for monitoring and forecasting trends in technological development fall short of capturing advancements in Large Language Models (LLMs). This chapter suggests a complementary and alternative approach to mitigate this concern. Traditional indicators, such as search volumes and citation frequencies, are demonstrated to inadequately reflect the rapid evolution of LLM-related technologies due to biases, semantic drifts, and inherent lags in data documentation. Our presented methodology analyzes the proximity of technological terms related to LLMs, leveraging the OpenAlex and arXiv databases, and focuses on extracting nouns from scientific papers to provide a nuanced portrayal of advancements in LLM technologies. The approach aims to counteract the inherent lags in data, accommodate semantic drift, and distinctly differentiate between various topics, offering both retrospective and prospective insights in their analytical purview. The insights derived underline the need for refined, robust, adaptable, and precise forecasting models as LLMs intersect with domains like cyber defense. At the same time, they are considering the limitations of singular ontologies and integrating advanced anticipatory measures for a nuanced understanding of evolving LLM technologies.
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Baur, Benedict. « Introduction ». Dans Elliptic Boundary Value Problems and Construction of Lp-Strong Feller Processes with Singular Drift and Reflection, 1–8. Wiesbaden : Springer Fachmedien Wiesbaden, 2014. http://dx.doi.org/10.1007/978-3-658-05829-6_1.

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Baur, Benedict. « Construction of $${L^p}$$ -Strong Feller Processes ». Dans Elliptic Boundary Value Problems and Construction of Lp-Strong Feller Processes with Singular Drift and Reflection, 9–41. Wiesbaden : Springer Fachmedien Wiesbaden, 2014. http://dx.doi.org/10.1007/978-3-658-05829-6_2.

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Baur, Benedict. « Elliptic Regularity up to the Boundary ». Dans Elliptic Boundary Value Problems and Construction of Lp-Strong Feller Processes with Singular Drift and Reflection, 43–54. Wiesbaden : Springer Fachmedien Wiesbaden, 2014. http://dx.doi.org/10.1007/978-3-658-05829-6_3.

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Baur, Benedict. « Construction of Elliptic Diffusions ». Dans Elliptic Boundary Value Problems and Construction of Lp-Strong Feller Processes with Singular Drift and Reflection, 55–70. Wiesbaden : Springer Fachmedien Wiesbaden, 2014. http://dx.doi.org/10.1007/978-3-658-05829-6_4.

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Baur, Benedict. « Applications ». Dans Elliptic Boundary Value Problems and Construction of Lp-Strong Feller Processes with Singular Drift and Reflection, 71–81. Wiesbaden : Springer Fachmedien Wiesbaden, 2014. http://dx.doi.org/10.1007/978-3-658-05829-6_5.

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Actes de conférences sur le sujet "Singular drift"

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Kim, Young-Jin, et Raul B. Rebak. « Photo-Electrochemistry of Zirconium Alloys in High Temperature Water – a Review ». Dans CORROSION 2009, 1–11. NACE International, 2009. https://doi.org/10.5006/c2009-09417.

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Abstract Zirconium alloys such as Zircaloy-2 and -4 are used as fuel cladding materials in nuclear power plants. These alloys have adequate corrosion resistance in high temperature aqueous conditions. For cladding applications is desirable when Zr alloys form a thin adherent lustrous oxide covering the entire surface of the component. However, under abnormal conditions spots of accelerated oxidation (corrosion) may develop. The two main anomalous mechanisms are nodular corrosion and shadow corrosion. Shadow corrosion may develop on Zr alloy components that are “facing” in close proximity other materials such as stainless steels or nickel alloys. The mechanism of shadow corrosion is still highly debated but is appears to be similar to a process of galvanic corrosion. Under irradiation the conductivity of the oxide film in Zr alloys increases, and its free corrosion potential drifts in a direction opposite to the direction of the stainless steel or nickel based alloy. This separation in potential may create a singular environment between the two different metals, which may lead to the development of shadow corrosion. That is, shadow corrosion may be a consequence of the unique photo-electrochemical behavior of the oxides that develop over the two types of materials (i.e. Zr alloys and stainless steels, for example). A critical review of the photo-electrochemistry characteristics of the passive film on Zr alloys and the impact on the modes of corrosion of Zr alloys is presented
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Shang, Dan, Guangquan Zhang et Jie Lu. « Fast concept drift detection using singular vector decomposition ». Dans 2017 12th International Conference on Intelligent Systems and Knowledge Engineering (ISKE). IEEE, 2017. http://dx.doi.org/10.1109/iske.2017.8258835.

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Rahman, Matiur, et S. Hossein Mousavizadegan. « On the Drift Forces of a Vertical Cylinder in Water of Finite Depth ». Dans ASME 2004 23rd International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2004. http://dx.doi.org/10.1115/omae2004-51086.

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Analytical solutions for the wave-induced second-order time independent drift forces and moments due to the dynamic and the waterline pressures on a fixed vertical circular cylinder are derived. The results are displayed graphically for a number of depth to radius ratios. An analytical technique is used to determine the first-order velocity potential by considering two regions, namely, interior region and exterior region. We have also demonstrated a numerical solution by a higher order panel method in which the kernel of the integral equation is modified to make it non-singular and amenable to solutions by the Gaussian quadrature formula. The numerical results are found to comply with the analytical solutions.
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Nagata, Keitaro, Hideo Matsufuru, Jun Nishimura et Shinji Shimasaki. « Gauge cooling for the singular-drift problem in the complex Langevin method - an application to finite density QCD ». Dans 34th annual International Symposium on Lattice Field Theory. Trieste, Italy : Sissa Medialab, 2017. http://dx.doi.org/10.22323/1.256.0067.

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Cimadomo, Guido, Eduardo Jimenz-Morales et Jorge Minguet-Medina. « Socio-spatial threats in post-covid Spanish touristic cities. Drift to exclusion in Seville and Malaga ». Dans Post-Oil City Planning for Urban Green Deals Virtual Congress. ISOCARP, 2020. http://dx.doi.org/10.47472/dnfq1790.

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This paper aims at recognizing the effects of social exclusion and the degradation process of public spaces and heritage environments in Spanish touristic destinations of Seville and Malaga. While it cannot be argued that after a lock-down as the experimented one, everything can return to the previous state, especially in environments where resilience has not been considered a value, in the early postCOVID lockdown days the mayors of these Andalusian cities reaffirmed the need to support the tourism sector as the only way to recover the economic breakout. We discuss the transformations that touristification and COVID-19 are driving into these cities, looking at the relaxed action of control and inspection on tourism activities and the offer of public “singular spaces” in the centre of the city for new activities related with the tourism industry and real estate speculation. Other European experiences are presented, showing that more focused measures on liveability and neighbour-centred recovery of urban life are possible.
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Peng, Hongxuan, et Wei Qiu. « Computation of Second-Order Wave Forces With a Panel-Free Method ». Dans ASME 2008 27th International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2008. http://dx.doi.org/10.1115/omae2008-57614.

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Wave drift forces on floating structures have been computed based on the near-field formulation and a panel-free method. The singular-free boundary integral equation is developed by removing the singularity in the free-surface Green function. The desingularized integral equation is then discretized by Gaussian quadrature over the exact geometry. The Gaussian points coincide with the collocation points. NURBS surfaces are employed to represent the exact body surface. No panelization of the body surface is required. Accuracy of the solution can be enhanced by changing the number of Gaussian points. For illustration, the computational method was applied to a floating hemisphere and a floating box in waves.
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Wasterlain, Se´bastien, Fabien Harel, Denis Candusso, Daniel Hissel et Xavier Franc¸ois. « A New High Voltage Impedance Spectrometer for the Diagnostic of Fuel Cell Stacks ». Dans ASME 2010 8th International Conference on Fuel Cell Science, Engineering and Technology. ASMEDC, 2010. http://dx.doi.org/10.1115/fuelcell2010-33232.

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This paper presents a novel architecture of an impedance spectrometer dedicated to the characterization and diagnostic of large Fuel Cell (FC) stacks operated in galvanostatic mode. The validation tests are first performed on a single Proton Exchange Membrane Fuel Cell (PEMFC). Then, experiments are carried out on a twenty-cell PEMFC stack delivering more significant power levels. The proposed impedancemeter allows spectrum measurements on cells located in the middle of the stack, where common mode potentials are usually too high for commercial devices. Moreover, the impedances of different individual cells in the stack are acquired with a synchronous measurement reference (global stack impedance). This capability allows distinguishing any singular cell behavior or drift effect of operational parameters (e.g. stack temperature and polarization current).
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Pennacchi, P., R. Ricci, S. Chatterton, P. Borghesani, A. Vania, G. D’Antona, C. Pensieri et C. Rolla. « Dynamic Effects of Electrical Pitting in Steam-Turbine Tilting-Pad Thrust-Bearings ». Dans ASME 2012 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/detc2012-71132.

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This paper merges the analysis of a case history and the simplified theoretical model related to a rather singular phenomenon that may happen in rotating machinery. Starting from the first, a small industrial steam turbine experienced a very strange behavior during megawatt load. When the unit was approaching the maximum allowed power, the temperature of the babbitt metal of the pads of the thrust bearing showed constant increase with an unrecoverable drift. Bearing inspection showed that pad trailing edge had the typical aspect of electrical pitting. This kind of damage was not reparable and bearing pads had to replaced. This problem occurred several times in sequence and was solved only by adding further ground brushes to the shaft-line. Failure analysis indicated electrodischarge machining as the root fault. A specific model, able to take into consideration the effect of electrical pitting and loading capacity decreasing as a consequence of the damage of the babbitt metal, is proposed in the paper and shows that the phenomenon causes the irretrievable failure of the thrust bearing.
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Petrović, V. M., H. S. Delibašić Marković et I. D. Petrović. « Impact of Coulomb correction on the nonadiabatic tunnel ionization in an elliptically polarized laser field ». Dans International Meeting on Data for Atomic and Molecular Processes in Plasmas : Advances in Standards and Modelling, 84–85. Belgrade, Serbia : Institute of Physics Belgrade, 2024. https://doi.org/10.69646/aob241126.

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Using a time-imaginary method rooted in the Landau-Dykhne model (Landau 1977) within the frame of the trajectory-based semiclassical approach, we developed an analytical model that investigates the impact of the Coulomb interaction between the atomic core and the escaping electron for a monochromatic elliptically polarized laser field on the tunnel ionization rate. We introduced an additional term in the imaginary part of the classical action due to the Coulomb interaction.This correction becomes substantially significant in the sub-barrier region, where the electron comes near the singular Coulomb core, influencing the complete tunneling dynamics. To accurately model these effects, we computed the electron trajectory considering the Coulomb forces and derived analytical expressions for both the initial and drift momenta (Petrović et al. 2023). Our results suggest that, in the whole considered ellipticity range, the Coulomb correction provides a significant, orders-in-magnitude, enhanced the total ionization rate without significantly altering its shape.Our results indicate that including the Coulomb correction not only modifies the energy distribution of the ionized electrons but also results in a narrower momentum distribution compared to models that omit this correction. These insights have significant implications for a broad spectrum of laser-matter interactions and could guide future research efforts in the field. - FULL TEXT available in PDF.
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Adam, Christopher S., Ian R. Berry, Kevin M. Short et Diana I. Saly. « A Dynamical Systems Approach to Stability Tracking of Treadmill Running ». Dans ASME 2008 International Mechanical Engineering Congress and Exposition. ASMEDC, 2008. http://dx.doi.org/10.1115/imece2008-67331.

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Traditional analysis of running gait utilizes averaged biomechanical data from several strides to generate a mean curve. This curve is then used to define the average picture of a runners gait. However, such measures are frequently accompanied by time normalization, which results in a loss of temporal variations in the gait patterns. An examination of stability requires analysis of both time and position, therefore loss of such information makes stability analysis difficult. On the contrary, the use of a dynamical systems approach for gait analysis allows for a better understanding of how variations in gait pattern change over time. In the current study runners ran on a treadmill, with both a flat and uneven surface, at a self selected speed. Three-dimensional position data was captured for 11 different anatomical locations at a frequency of 120 Hz using a Qualysis motion capture system. The data was first shifted to a lumbar coordinate system to account for low frequency drift attributed to the subjects’ drift on the treadmill. Since all of the markers were rigidly connected, via the subject, the movements and variations of certain components of the 33-dimensional measurements were not independent. As a result, it was possible to reduce the dimensionality of the transformed data using singular value decomposition techniques. The primary components were then analyzed using the method of delay embeddings to extract geometric information, revealing the natural structure found in the data as a result of the periodicity of each running stride. A nearest neighbor mean stride orbit was then computed to create a reference orbit, so that deviations from the mean stride orbit can be measured. The expectation was that a more stable running configuration would lead to smaller deviations from the mean stride orbit. On-going work that will be reported includes: (i) analysis of running stability related to the reference stride comparator, (ii) compensation of lumbar centroid dynamics, (iii) reconstructions using one dimension from the lumbar centroid transformed data, and (iv) consideration of transients, fatigue, adaptation, etc.
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