Bibliographies thématiques / Dissipative approach

Littérature scientifique sur le sujet « Dissipative approach »

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Articles de revues sur le sujet "Dissipative approach"

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CHRISTOV, C. I. « DISSIPATIVE QUASI-PARTICLES : THE GENERALIZED WAVE EQUATION APPROACH ». International Journal of Bifurcation and Chaos 12, no 11 (novembre 2002) : 2435–44. http://dx.doi.org/10.1142/s0218127402005959.

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Generalized Wave Equations containing dispersion, dissipation and energy-production (GDWE) are considered in lieu of dissipative NEE as more suitable models for two-way interaction of localized waves. The quasi-particle behavior and the long-time evolution of localized solutions upon take-over and head-on collisions are investigated numerically by means of an adequate difference scheme which represents faithfully the balance/conservation laws. It is shown that in most cases the balance between energy production/dissipation and nonlinearity plays a similar role to the classical Boussinesq balance between dispersion and nonlinearity, namely it can create and support localized solutions which behave as quasi-particles upon collisions and for a reasonably long time after that.
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Mayorga, M. « Upper Bound for the Entropy Production and Dissipative Particle Dynamics ». International Journal of Modern Physics C 09, no 08 (décembre 1998) : 1299–306. http://dx.doi.org/10.1142/s0129183198001175.

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The upper bound for the entropy production of a dense gas is presented and its connection with the so-called Fisher information measure is revised. The relation with dissipative particle dynamics is analyzed, which serve to identify the thermostat for the fluid system. The analogy with a turbulence approach, a probabilistic approach to dynamical sytems, detailed balance for dissipative particle dynamics and fluctuation dissipation theorems for relaxing systems is presented.
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Bhattacharya, Samyadeb, et Sisir Roy. « Dissipative Effect and Tunneling Time ». Advances in Mathematical Physics 2011 (2011) : 1–13. http://dx.doi.org/10.1155/2011/138358.

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The quantum Langevin equation has been studied for dissipative system using the approach of Ford et al. Here, we have considered the inverted harmonic oscillator potential and calculated the effect of dissipation on tunneling time, group delay, and the self-interference term. A critical value of the friction coefficient has been determined for which the self-interference term vanishes. This approach sheds new light on understanding the ion transport at nanoscale.
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AURICCHIO, FERDINANDO, ELENA BONETTI et ANTONIO MARIGONDA. « A METRIC APPROACH TO PLASTICITY VIA HAMILTON–JACOBI EQUATION ». Mathematical Models and Methods in Applied Sciences 20, no 09 (septembre 2010) : 1617–47. http://dx.doi.org/10.1142/s0218202510004726.

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Thermodynamical consistency of plasticity models is usually written in terms of the so-called "maximum dissipation principle". In this paper, we discuss constitutive relations for dissipative materials written through suitable generalized gradients of a (possibly non-convex) metric. This new framework allows us to generalize the classical results providing an interpretation of the yield function in terms of Hamilton–Jacobi equations theory.
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LÓPEZ, G., M. MURGUÍA et M. SOSA. « TIME-INDEPENDENT APPROACH FOR DISSIPATIVE SYSTEMS ». Modern Physics Letters B 10, no 24 (20 octobre 1996) : 1197–203. http://dx.doi.org/10.1142/s021798499600136x.

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A new dissipative model is proposed for the small component of a mixture of a small and large component of gases, where the large component is treated as an ideal gas. The thermodynamic characteristics of the gas are derived through a statistical mechanical approach. The model requires for the small component to have a big dimension and its number of particles to be smaller than the large one. Using the associated partition function, the internal energy and the equation of state are calculated. The internal energy does not suffer any deviation from that of the two component ideal gas, but the equation of state deviates from that of the ideal gas for large values of the parameter which characterizes the dissipative model.
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Sakagami, M. a., et T. Kubota. « Path Integral Approach to Dissipative Processes ». Progress of Theoretical Physics 76, no 2 (1 août 1986) : 548–60. http://dx.doi.org/10.1143/ptp.76.548.

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Bose, Thomas, et Steffen Trimper. « Lagrangian approach and dissipative magnetic systems ». Physics Letters A 375, no 24 (juin 2011) : 2452–55. http://dx.doi.org/10.1016/j.physleta.2011.05.019.

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Ankiewicz, Adrian, Nail Akhmediev et Natasha Devine. « Dissipative solitons with a Lagrangian approach ». Optical Fiber Technology 13, no 2 (avril 2007) : 91–97. http://dx.doi.org/10.1016/j.yofte.2006.12.001.

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ABE, Y., C. GRÉGOIRE et H. DELAGRANGE. « LANGEVIN APPROACH TO NUCLEAR DISSIPATIVE DYNAMICS ». Le Journal de Physique Colloques 47, no C4 (août 1986) : C4–329—C4–338. http://dx.doi.org/10.1051/jphyscol:1986436.

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Civelek, Cem. « Observability, controllability and stability of a nonlinear RLC circuit in form of a Duffing oscillator by means of theoretical mechanical approach ». Journal of Electrical Engineering 73, no 2 (1 avril 2022) : 140–45. http://dx.doi.org/10.2478/jee-2022-0018.

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Abstract In this research article, observability, controllability and stability of a nonlinear RLC circuit with a nonlinear capacitor is investigated as a Duffing oscillator beginning with the dissipative equations of generalized motion using Lagrange-dissipative model ({L, D} -model briefly). The force related to the potential energy, equilibria, and their well known stability properties are given using state space approach. Prerequisite that the condition for a Legendre transform is fulfilled, for the same system, also Hamiltonian of the system is found. Using Hamiltonian and dissipation function, dissipative canonical equations are obtained. These equations are written in state space form. Then the equality to the same results obtained using the dissipative equations of generalized motion related equilibria and their stability was shown. Thus a Lyapunov function as residual energy function (REF) is justified in terms of stability of the overall system. As last step, different electrical and mechanical (physical) realization possibilities are discussed.
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Thèses sur le sujet "Dissipative approach"

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Tanriverdi, Vedat. « Nuclear Dissipative Dynamics In Langevin Approach ». Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/12605034/index.pdf.

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In this thesis Langevin approach is applied to analyze the nuclear dissipative dynamics in fission and fusion reactions. In these investigations, the nuclear elongation coordinate and the corresponding momentum are chosen as collective variables. By considering changes in these variables the decay rate of fission and the formation probability of fusion for heavy ion reactions are calculated. These calculations are performed using simulation techniques and the results thus obtained are compared with the corresponding results of analytic solutions.
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Rolt, Kenneth D. « A dissipative wave packet approach for unified nonlinear acoustics ». Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/28080.

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Mathey, Steven [Verfasser], et Thomas [Akademischer Betreuer] Gasenzer. « Functional renormalisation approach to driven dissipative dynamics / Steven Mathey ; Akademischer Betreuer : Thomas Gasenzer ». Heidelberg : Universitätsbibliothek Heidelberg, 2014. http://d-nb.info/1180325141/34.

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Koch, Christiane. « Quantum dissipative dynamics with a surrogate Hamiltonian ». Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2002. http://dx.doi.org/10.18452/14816.

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Diese Dissertation untersucht Quantensysteme in kondensierter Phase, welche mit ihrer Umgebung wechselwirken und durch ultrakurze Laserpulse angeregt werden. Die Zeitskalen der verschiedenen beteiligten Prozessen lassen sich bei solchen Problemen nicht separieren, weshalb die Standardmethoden zur Behandlung offener Quantensysteme nicht angewandt werden können. Die Methode des Surrogate Hamiltonian stellt ein Beispiel neuer Herangehensweisen an dissipative Quantendynamik dar. Die Weiterentwicklung der Methode und ihre Anwendung auf Phänomene, die zur Zeit experimentell untersucht werden, stehen im Mittelpunkt dieser Arbeit. Im ersten Teil der Arbeit werden die einzelnen dissipativen Prozesse klassifiziert und diskutiert. Insbesondere wird ein Modell der Dephasierung in die Methode des Surrogate Hamiltonian eingeführt. Dies ist wichtig für zukünftige Anwendungen der Methode, z.b. auf kohärente Kontrolle oder Quantencomputing. Diesbezüglich hat der Surrogate Hamiltonian einen großen Vorteil gegenüber anderen zur Verfügung stehenden Methoden dadurch, daß er auf dem Spin-Bad, d.h. auf einer vollständig quantenmechanischen Beschreibung der Umgebung, beruht. Im nächsten Schritt wird der Surrogate Hamiltonian auf ein Standardproblem für Ladungstransfer in kondensierter Phase angewandt, zwei nichtadiabatisch gekoppelte harmonische Oszillatoren, die in ein Bad eingebettet sind. Dieses Modell stellt eine große Vereinfachung von z.B. einem Molekül in Lösung dar, es dient hier jedoch als Testbeispiel für die theoretische Beschreibung eines prototypischen Ladungstransferereignisses. Alle qualitativen Merkmale eines solchen Experimentes können wiedergegeben und Defizite früherer Behandlungen identifiziert werden. Ultraschnelle Experimente beobachten Reaktionsdynamik auf der Zeitskala von Femtosekunden. Dies kann besonders gut durch den Surrogate Hamiltonian als einer Methode, die auf einer zeitabhängigen Beschreibung beruht, erfaßt werden. Die Kombination der numerischen Lösung der zeitabhängigen Schrödingergleichung mit der Wignerfunktion, die die Visualisierung eines Quantenzustands im Phasenraum ermöglicht, gestattet es, dem Ladungstransferzyklus intuitiv Schritt für Schritt zu folgen. Der Nutzen des Surrogate Hamiltonian wird weiterhin durch die Verbindung mit der Methode der Filterdiagonalisierung erhöht. Dies gestattet es, aus mit dem Surrogate Hamiltonian nur für relative kurze Zeite konvergierte Erwartungswerten Ergebnisse in der Frequenzdomäne zu erhalten. Der zweite Teil der Arbeit beschäftigt sich mit der theoretischen Beschreibung der laserinduzierten Desorption kleiner Moleküle von Metalloxidoberflächen. Dieses Problem stellt ein Beispiel dar, in dem alle Aspekte mit derselben methodischen Genauigkeit beschrieben werden, d.h. ab initio Potentialflächen werden mit einem mikroskopischen Modell für die Anregungs- und Relaxationsprozesse verbunden. Das Modell für die Wechselwirkung zwischen angeregtem Adsorbat-Substrat-System und Elektron-Loch-Paaren des Substrats beruht auf einer vereinfachten Darstellung der Elektron-Loch-Paare als ein Bad aus Dipolen und auf einer Dipol-Dipol-Wechselwirkung zwischen System und Bad. Alle Parameter können aus Rechnungen zur elektronischen Struktur abgeschätzt werden. Desorptionswahrscheinlichkeiten und Desorptionsgeschwindigkeiten werden unabhängig voneinander im experimentell gefundenen Bereich erhalten. Damit erlaubt der Surrogate Hamiltonian erstmalig eine vollständige Beschreibung der Photodesorptionsdynamik auf ab initio-Basis.
This thesis investigates condensed phase quantum systems which interact with their environment and which are subject to ultrashort laser pulses. For such systems the timescales of the involved processes cannot be separated, and standard approaches to treat open quantum systems fail. The Surrogate Hamiltonian method represents one example of a number of new approaches to address quantum dissipative dynamics. Its further development and application to phenomena under current experimental investigation are presented. The single dissipative processes are classified and discussed in the first part of this thesis. In particular, a model of dephasing is introduced into the Surrogate Hamiltonian method. This is of importance for future work in fields such as coherent control and quantum computing. In regard to these subjects, it is a great advantage of the Surrogate Hamiltonian over other available methods that it relies on a spin, i.e. a fully quantum mechanical description of the bath. The Surrogate Hamiltonian method is applied to a standard model of charge transfer in condensed phase, two nonadiabatically coupled harmonic oscillators immersed in a bath. This model is still an oversimplification of, for example, a molecule in solution, but it serves as testing ground for the theoretical description of a prototypical ultrafast pump-probe experiment. All qualitative features of such an experiment are reproduced and shortcomings of previous treatments are identified. Ultrafast experiments attempt to monitor reaction dynamics on a femtosecond timescale. This can be captured particularly well by the Surrogate Hamiltonian as a method based on a time-dependent picture. The combination of the numerical solution of the time-dependent Schrödinger equation with the phase space visualization given by the Wigner function allows for a step by step following of the sequence of events in a charge transfer cycle in a very intuitive way. The utility of the Surrogate Hamiltonian is furthermore significantly enhanced by the incorporation of the Filter Diagonalization method. This allows to obtain frequency domain results from the dynamics which can be converged within the Surrogate Hamiltonian approach only for comparatively short times. The second part of this thesis is concerned with the theoretical treatment of laser induced desorption of small molecules from oxide surfaces. This is an example which allows for a description of all aspects of the problem with the same level of rigor, i.e. ab initio potential energy surfaces are combined with a microscopic model for the excitation and relaxation processes. This model of the interaction between the excited adsorbate-substrate complex and substrate electron-hole pairs relies on a simplified description of the electron-hole pairs as a bath of dipoles, and a dipole-dipole interaction between system and bath. All parameters are connected to results from electronic structure calculations. The obtained desorption probabilities and desorption velocities are simultaneously found to be in the right range as compared to the experimental results. The Surrogate Hamiltonian approach therefore allows for a complete description of the photodesorption dynamics on an ab initio basis for the first time.
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Sakurai, Atsunori. « Exploring Nonlinear Responses of Quantum Dissipative Systems from Reduced Hierarchy Equations of Motion Approach ». 京都大学 (Kyoto University), 2013. http://hdl.handle.net/2433/179368.

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Roosen, David [Verfasser], Walter [Akademischer Betreuer] Hofstetter et Peter [Akademischer Betreuer] Kopietz. « A numerical renormalization group approach to dissipative quantum impurity systems / David Roosen. Gutachter : Walter Hofstetter ; Peter Kopietz. Betreuer : Walter Hofstetter ». Frankfurt am Main : Univ.-Bibliothek Frankfurt am Main, 2012. http://d-nb.info/1044772611/34.

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Yilmaz, Bulent. « Stochastic Approach To Fusion Dynamics ». Phd thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/12608517/index.pdf.

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This doctoral study consists of two parts. In the first part, the quantum statistical effects on the formation process of the heavy ion fusion reactions have been investigated by using the c-number quantum Langevin equation approach. It has been shown that the quantum effects enhance the over-passing probability at low temperatures. In the second part, we have developed a simulation technique for the quantum noises which can be approximated by two-term exponential colored noise.
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Martelli, F. « WAVEPACKET APPROACHES TO DISSIPATIVE QUANTUM DYNAMICS ». Doctoral thesis, Università degli Studi di Milano, 2010. http://hdl.handle.net/2434/150221.

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Many processes arising in Chemistry, Physics and Biology show quantum effects. Representative examples are chemical reactions involving light atoms, energy transfer in complex environments, electronic and geometrical properties of complex and bulk systems, tunneling phenomena etc. Theoretical Chemistry deals with such kind of problems with the help of numerical solutions of the Time Dependent Schrodinger Equation (TDSE). On the other hand, when classical effects are most relevant as, for example, in large dynamical systems like proteins at room temperature, Theoretical Chemistry deals with this problems with the help of numerical solution of the Newton's equations. Solving numerically the TDSE is much more expansive than solving the classical Newton's equations of motion. Thus, often mixed descriptions are used treating the system at the exact -quantum- level and the environment at the approximated classical level. When a full quantum approach is needed both for the system and for the environment (as, for example, in processes involving quantum objects, such as light atoms, energy transfer in small molecules interacting with a thermal bath at low temperature, and so on), one faces with so called Open Quantum Systems, and the corresponding dynamics is generally dissipative. In open quantum systems the wavefunction description fails because of a lack of the complete knowledge of the state. It is then necessary to switch to the density matrix description, which contains all the information. The system dynamics is affected by the presence of the bath depending on the interactions between them. If the coupling is small, than the system evolves in time without been affected by the environment. If the system is initially prepared as a pure state, then the dynamics is coherent. On the other hand if system and bath are strongly interacting, than the system dynamics is modified by the presence of the bath and described by a mixture of states. Under the condition of strong coupling, the modified dynamics is incoherent, also if the initial state of the system is pure. Based on the Multi Configuration Time Dependent Hartree (MCTDH) approach, which writes the wavefunction as linear combination of Hartree products, the MCTDH program has been developed. This program is the only one allowing to deal with large, dissipative problems (up to 100 degrees of freedom). Recently, variants of the MCTDH approach have been developed in order to increase the number of degrees of freedom which can be considered. The GMCTDH approach treats part of the MCTDH wavefunction as Gaussian functions, which are analytically known; the LCSA approach, on the other hand, can be viewed as a GMCTDH approach with selected configurations. In our project we have studied the effect of the environment on quantum systems. In particular, we have studied the influence of the environment in simple chemical process both from a theoretical and from a computational point of view. Specifically, we have developed a model to study excitoninc energy transfer in dissipative media, performed numerical simulations using the MCTDH approach, and obtained analytical expressions for the equations of motion in the so called mixed quantum-classical hydrodynamics picture.
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Charkaluk, Éric Saxcé Géry de. « Fatigue des matériaux métalliques quelques contributions à une approche dissipative / ». Villeneuve d'Ascq : Université des sciences et technologies de Lille, 2007. https://iris.univ-lille1.fr/dspace/handle/1908/1030.

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Reproduction de : Habilitation à diriger des recherches : Sciences mathématiques : Lille 1 : 2006.
N° d'ordre (Lille 1) : 548. Titre provenant de la page de titre du document numérisé. Bibliogr. à la suite des chapitres.
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Berro, Hassan. « A molecular dynamics approach to nano-scale lubrication ». Lyon, INSA, 2010. http://theses.insa-lyon.fr/publication/2010ISAL0084/these.pdf.

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A Molecular Dynamics Approach to Nano-scale Lubrication Abstract A numerical approach based on Molecular Dynamics simulations was developed in the purpose of investigating the local mechanisms of lubrication at nano-scales. The model ele-ments were introduced and characterized in order to yield the most realistic material and inter-facial properties of the contact. Due to their tight relationship with friction at the nanometre scale, the energetic dissipation methods used in molecular dynamics were revisited and guide-lines were set for choosing a correct dissipation method for a variety of operating conditions. Moreover, a novel method combining physical relevance and simplicity was introduced for studying heat dissipation in the high-shear regime. The model was then employed to investigate the effects related to the molecular structure of the surfaces and that of the confined lubricant. On one hand, for studying different tribologi-cal surfaces, an original method was used to quantitatively measure the physical adsorption and corrugation potentials. These properties directly influence the structuring and boundary flow in confined films. On the other hand, the influence of lubricant molecular shape and mole-cular mixing on the tribological performance was investigated for both wetting and non-wetting surfaces. The simulations allowed local analysis of lubricated friction to be performed from the molecular scale and thus a better understanding of the physical interaction between the involved elements
Une approche numérique basée sur des simulations Dynamique Moléculaire a été développée dans le but d'étudier les mécanismes locaux de la lubrification à l'échelle nanométrique. Les éléments du modèle ont été présentés et caractérisés afin de reproduire les propriétés les plus réalistes des matériaux et de l'interface du contact. En raison de leur relation étroite avec le frottement, les méthodes de dissipation énergétique pour la dynamique moléculaire ont été revisitées et des recommandations ont été proposées pour le choix d'une méthode correcte adaptée aux différentes conditions opératoires. Pour le régime de fort cisaillement et donc de forte dissipation, une nouvelle méthode mieux fondée physiquement a été développée, combinant simplicité et vitesse de calcul. Le modèle a ensuite été utilisé pour étudier les effets liés à la structure moléculaire des surfaces et du lubrifiant confiné. Afin d'étudier différentes surfaces tribologiques, une méthode originale a été utilisée pour mesurer quantitativement les potentiels physiques d'adsorption et de corrugation. Ces propriétés influencent directement la stratification dans le film et son glissement à l'interface solide. D'autre part, l'influence de la forme moléculaire du lubrifiant sur sa performance tribologique a été étudiée, en solution pure et en mélange, pour les surfaces mouillantes et non-mouillantes. Les simulations moléculaires ont permis une analyse locale du frottement lubrifié à l'échelle moléculaire et ainsi une meilleure compréhension des interactions physiques entre les éléments mis en jeu
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Livres sur le sujet "Dissipative approach"

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Vakulenko, Sergey. Complexity and evolution of dissipative systems : An analytical approach. Berlin : Walter de Gruyter, 2014.

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1976-, Nersesov Sergey G., dir. Stability and control of large-scale dynamical systems : A vector dissipative systems approach. Princeton, N.J : Princeton University Press, 2011.

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Rakotomanana, L. R. A Geometric Approach to Thermomechanics of Dissipating Continua. Boston, MA : Birkhäuser Boston, 2004. http://dx.doi.org/10.1007/978-0-8176-8132-6.

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Rakotomanana, L. R. A Geometric Approach to Thermomechanics of Dissipating Continua. Boston, MA : Birkhäuser Boston, 2004.

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Center, Langley Research, dir. Preprocessing for eddy dissipation rate and TKE profile generation. Hampton, Va : National Aeronautics and Science Administration, Langley Research Center, 2001.

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Chen, Hsing-Ta. Delving Into Dissipative Quantum Dynamics : From Approximate to Numerically Exact Approaches. [New York, N.Y.?] : [publisher not identified], 2016.

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Vakulenko, Sergey. Complexity and Evolution of Dissipative Systems : An Analytical Approach. De Gruyter, Inc., 2013.

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Vakulenko, Sergey. Complexity and Evolution of Dissipative Systems : An Analytical Approach. de Gruyter GmbH, Walter, 2013.

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Nersesov, Sergey G., et Wassim M. Haddad. Stability and Control of Large-Scale Dynamical Systems : A Vector Dissipative Systems Approach. Princeton University Press, 2011.

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Nersesov, Sergey G., et Wassim M. Haddad. Stability and Control of Large-Scale Dynamical Systems : A Vector Dissipative Systems Approach. Princeton University Press, 2011.

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Chapitres de livres sur le sujet "Dissipative approach"

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Mori, Hazime, et Yoshiki Kuramoto. « A Physical Approach to Chaos ». Dans Dissipative Structures and Chaos, 129–49. Berlin, Heidelberg : Springer Berlin Heidelberg, 1998. http://dx.doi.org/10.1007/978-3-642-80376-5_9.

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Kopachevsky, Nikolay D., et Selim G. Krein. « Oscillations of Partially Dissipative Hydrosystems ». Dans Operator Approach to Linear Problems of Hydrodynamics, 251–314. Basel : Birkhäuser Basel, 2003. http://dx.doi.org/10.1007/978-3-0348-8063-3_5.

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Weiland, Siep. « Dissipative Dynamical Systems : A Behavioral Approach ». Dans New Trends in Systems Theory, 707–14. Boston, MA : Birkhäuser Boston, 1991. http://dx.doi.org/10.1007/978-1-4612-0439-8_89.

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Baty, Hubert, et Hiroaki Nishikawa. « A Hyperbolic Approach for Dissipative Magnetohydrodynamics ». Dans Theory, Numerics and Applications of Hyperbolic Problems I, 137–49. Cham : Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-91545-6_11.

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Kohen, Daniela, et David J. Tannor. « Phase Space Approach to Dissipative Molecular Dynamics ». Dans Advances in Chemical Physics, 219–398. Hoboken, NJ, USA : John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470141700.ch2.

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Sols, F. « Dissipative Transport in Nanostructures : A Many-Electron Approach ». Dans Phonons in Semiconductor Nanostructures, 479–87. Dordrecht : Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1683-1_46.

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Biot, M. A. « On a Unified Thermodynamic Approach to a Large Class of Instabilities of Dissipative Continua ». Dans Advances in Chemical Physics, 13–16. Hoboken, NJ, USA : John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470143841.ch2.

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Mirra, M., et G. Ravenshorst. « A seismic retrofitting design approach for activating dissipative behavior of timber diaphragms in existing unreinforced masonry buildings ». Dans Current Perspectives and New Directions in Mechanics, Modelling and Design of Structural Systems, 1901–7. London : CRC Press, 2022. http://dx.doi.org/10.1201/9781003348443-312.

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Mirra, M., et G. Ravenshorst. « A seismic retrofitting design approach for activating dissipative behavior of timber diaphragms in existing unreinforced masonry buildings ». Dans Current Perspectives and New Directions in Mechanics, Modelling and Design of Structural Systems, 663–64. London : CRC Press, 2022. http://dx.doi.org/10.1201/9781003348450-312.

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Achermann, Guillem, Gabriele De Luca et Michele Simoni. « An Information-Theoretic and Dissipative Systems Approach to the Study of Knowledge Diffusion and Emerging Complexity in Innovation Systems ». Dans Lecture Notes in Computer Science, 252–65. Cham : Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-50423-6_19.

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Actes de conférences sur le sujet "Dissipative approach"

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Wentzel, Richard E., et Jeff VanBuskirk. « A Dissipative Approach to Vehicle Sound Abatement ». Dans Noise & Vibration Conference & Exposition. 400 Commonwealth Drive, Warrendale, PA, United States : SAE International, 1999. http://dx.doi.org/10.4271/1999-01-1668.

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Castin, Yvan, Jean Dalibard et Klaus Mo̸lmer. « A wave function approach to dissipative processes ». Dans Thirteenth International conference on atomic physics (ICAP-13). AIP, 1993. http://dx.doi.org/10.1063/1.43795.

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Wynne, James J. « Approach to nonlinear optical balance ». Dans OSA Annual Meeting. Washington, D.C. : Optica Publishing Group, 1987. http://dx.doi.org/10.1364/oam.1987.tud13.

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In the presence of resonant multiphoton excitation, experimental observations of photoionization, fluorescence, and amplified spontaneous emission have shown suppression of these effects.1 There is a common mechanism tying these phenomena together. All these processes involve the coherent nonlinear coupling of two or more optical waves via a dissipative nonlinear optical medium. Independent of initial conditions, as these waves propagate through the nonlinear medium, they develop amplitudes and relative phases that minimize the dissipative losses. The condition of minimum loss is one in which the excitation of the nonlinear medium is reduced due to the waves being in a state of nonlinear optical balance. This balance is stabilized by the dissipation. Other combinations of amplitude and phase are more lossy and rapidly damped out.
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Zimin, B. A., I. S. Zorin et V. E. Sventitskaya. « On the Hamilton approach of the dissipative systems ». Dans THE EIGHTH POLYAKHOV’S READING : Proceedings of the International Scientific Conference on Mechanics. Author(s), 2018. http://dx.doi.org/10.1063/1.5034716.

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Jung, Tae-Hwa, et Changhoon Lee. « Supercritical Group Velocity for Dissipative Waves in Shallow Water ». Dans ASME 2012 31st International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/omae2012-83279.

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The group velocity for waves with energy dissipation in shallow water was investigated. In the Eulerian viewpoint, the geometric optics approach was used to get, at the first order, complex-valued wave numbers from given real-valued angular frequency, water depth, and damping coefficient. The phase velocity was obtained as the ratio of angular frequency to realvalued wave number. Then, at the second order, we obtained the energy transport equation which gives the group velocity. We also used the Lagrangian geometric optics approach which gives complex-valued angular frequencies from real-valued wave number, water depth, and damping coefficient. A noticeable thing was found that the group velocity is always greater than the phase velocity (i.e., supercritical group velocity) in the presence of energy dissipation which is opposite to the conventional theory for non-dissipative waves. The theory was proved through numerical experiments for dissipative bichromatic waves which propagate on a horizontal bed. Both the wave length and wave energy decrease for waves with energy dissipation. As a result, wave transformation such as shoaling, refraction, and diffraction are all affected by the energy dissipation. This implies that the shoaling, refraction, and diffraction coefficients for dissipative waves are different from the corresponding coefficients for non-dissipative waves. The theory was proved through numerical experiments for dissipative monochromatic waves which propagate normally or obliquely on a planar slope.
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Mazauric, Vincent, Nadia Maizi, Loic Rondot et Philippe Wendling. « Dissipative processes in electrical engineering : A multi-scale approach ». Dans 2010 14th Biennial IEEE Conference on Electromagnetic Field Computation (CEFC 2010). IEEE, 2010. http://dx.doi.org/10.1109/cefc.2010.5481409.

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Sahoo, Ambaresh, Samudra Roy et Govind P. Agrawal. « Frequency downshifting of perturbed dissipative solitons : A variational approach ». Dans Frontiers in Optics. Washington, D.C. : OSA, 2017. http://dx.doi.org/10.1364/fio.2017.jtu3a.66.

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Sussman, Roberto A., Leonardo Dagdug, A. García-Perciante, A. Sandoval-Villalbazo et L. S. García-Colín. « Self-gravitating dissipative sources in the “fluid flow” approach ». Dans IV MEXICAN MEETING ON MATHEMATICAL AND EXPERIMENTAL PHYSICS : RELATIVISTIC FLUIDS AND BIOLOGICAL PHYSICS. AIP, 2010. http://dx.doi.org/10.1063/1.3533206.

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Rahman, MuhibUr, et Ke Wu. « Hybrid Dissipative NLTL Soliton Solution Based on KdV Approach ». Dans 2020 IEEE International Symposium on Antennas and Propagation and North American Radio Science Meeting. IEEE, 2020. http://dx.doi.org/10.1109/ieeeconf35879.2020.9329626.

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Perodou, Arthur, Anton Korniienko, Mykhailo Zarudniev et Gerard Scorletti. « Frequency Design of Interconnected Dissipative Systems : a Unified LMI Approach ». Dans 2018 IEEE Conference on Decision and Control (CDC). IEEE, 2018. http://dx.doi.org/10.1109/cdc.2018.8618932.

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Rapports d'organisations sur le sujet "Dissipative approach"

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Segalman, Daniel Joseph. A modal approach to modeling spatially distributed vibration energy dissipation. Office of Scientific and Technical Information (OSTI), août 2010. http://dx.doi.org/10.2172/993326.

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Younes, W., et D. Gogny. Collective Dissipation from Saddle to Scission in a Microscopic Approach. Office of Scientific and Technical Information (OSTI), septembre 2012. http://dx.doi.org/10.2172/1053675.

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Gambill, Daniel, Matthew Stoklosa, Sean Matus, Heidi Howard et Garrett Feezor. White Sands Missile Range Thurgood Canyon watershed : analysis of Range Road 7 for development of best management practices and recommendations. Engineer Research and Development Center (U.S.), septembre 2022. http://dx.doi.org/10.21079/11681/45622.

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Thurgood Canyon, located on White Sands Missile Range (WSMR), contains an alluvial fan that is bisected by a primary installation road and is in the proximity of sensitive fish habitats. This project was initiated to determine if and how sensitive fish habitats at the base of the fan are impacted by the existing drainage infrastructure and to assess the condition and sustainability of the existing transportation infrastructure. Findings show that the current drainage infrastructure maintains flow energy and sediment carrying capacity further down the fan than would occur in its absence. However, frequent to moderately rare (small to medium) flood events dissipate over 2 km from sensitive habitat, and overland flow and sediment do not reach the base of the fan. Controlled flow diversion is recommended upstream of the road to mitigate infrastructure or habitat impacts during very rare (very large) flood events. A comprehensive operation and management approach is presented to achieve sustainable transportation infrastructure and reduce the likelihood of impacts to the sensitive habitat.
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Cahaner, Avigdor, Sacit F. Bilgili, Orna Halevy, Roger J. Lien et Kellye S. Joiner. effects of enhanced hypertrophy, reduced oxygen supply and heat load on breast meat yield and quality in broilers. United States Department of Agriculture, novembre 2014. http://dx.doi.org/10.32747/2014.7699855.bard.

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Original objectivesThe objectives of this project were to evaluate the growth performance, meat yield and quality attributes of broiler strains widely differing in their genetic potential under normal temperature vs. warm temperature (short and long-term) conditions. Strain differences in breast muscle accretion rate, metabolic responses under heat load and, gross and histopathological changes in breast muscle under thermal load was also to be characterized. BackgroundTremendous genetic progress has been made in broiler chicken growth rate and meat yield since the 1950s. Higher growth rate is driven by higher rates of feed intake and metabolism, resulting in elevated internal heat production. Hot rearing conditions negatively affect broiler growth by hindering dissipation of heat and may lead to a lethal elevation in body temperature. To avoid heat-induced mortality, broilers reduce feed intake, leading to depressed growth rate, lower weight gain, reduce breast meat yield and quality. Thus, the genetic potential of contemporary commercial broilers (CCB) is not fully expressed under hot conditions. Major conclusions, solutions, and achievementsResearch conducted in Israel focused on three broiler strains – CCB, Featherless, Feathered sibs (i.e., sharing similar genetic background). Complimentary research trials conducted at Auburn utilized CCB (Cobb 500, Cobb 700, Ross 308, Ross 708), contrasting their performance to slow growing strains. Warm rearing conditions consistently reduced feed intake, growth rate, feed efficiency, body weight uniformity and breast muscle yield, especially pronounced with CCB and magnified with age. Breast meat quality was also negatively affected, as measured by higher drip loss and paler meat color. Exposure to continuous or short-term heat stress induced respiratory alkalosis. Breast muscle histomorphometrics confirmed enhanced myofiber hypertrophy in CCB. Featherless broilers exhibited a significant increase in blood-vessel density under warm conditions. Rapid growth and muscle accretion rate was correlated to various myopathies (white striping, woody and necrotic) as well as to increases in plasma creatinekinase levels. Whether the trigger(s) of muscle damage is loss of cellular membrane integrity due to oxidative damage or tissue lactate accumulation, or to loss of inter-compartmental cation homeostasis is yet to be determined. Based on genome-wide single-nucleotide polymorphism array genotyping, identification of the gene with the recessive mutation Scaleless (sc) facilitated the development a dCAPS assay to discriminate between sc carrier (sc/+) and non-carrier (+/+) individuals. ImplicationsThis project confirmed that featherless broiler strains grow efficiently with high yield and quality of breast meat, even under warm rearing conditions that significantly depress the overall performance of CCB. Therefore, broiler meat production in hot regions and climates can be substantially improved by introducing the featherless gene into contemporary commercial broiler stocks. This approach has become more feasible with the development of dCAPS assay. A novel modification of the PCR protocol (using whole blood samples instead of extracted DNA) may contribute to the efficient development of commercial featherless broiler strains. Such strains will allow expansion of the broiler meat production in developing countries in warm climates, where energy intensive environmental control of rearing facilities are not economical and easily achievable.
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Wu, Yingjie, Selim Gunay et Khalid Mosalam. Hybrid Simulations for the Seismic Evaluation of Resilient Highway Bridge Systems. Pacific Earthquake Engineering Research Center, University of California, Berkeley, CA, novembre 2020. http://dx.doi.org/10.55461/ytgv8834.

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Bridges often serve as key links in local and national transportation networks. Bridge closures can result in severe costs, not only in the form of repair or replacement, but also in the form of economic losses related to medium- and long-term interruption of businesses and disruption to surrounding communities. In addition, continuous functionality of bridges is very important after any seismic event for emergency response and recovery purposes. Considering the importance of these structures, the associated structural design philosophy is shifting from collapse prevention to maintaining functionality in the aftermath of moderate to strong earthquakes, referred to as “resiliency” in earthquake engineering research. Moreover, the associated construction philosophy is being modernized with the utilization of accelerated bridge construction (ABC) techniques, which strive to reduce the impact of construction on traffic, society, economy and on-site safety. This report presents two bridge systems that target the aforementioned issues. A study that combined numerical and experimental research was undertaken to characterize the seismic performance of these bridge systems. The first part of the study focuses on the structural system-level response of highway bridges that incorporate a class of innovative connecting devices called the “V-connector,”, which can be used to connect two components in a structural system, e.g., the column and the bridge deck, or the column and its foundation. This device, designed by ACII, Inc., results in an isolation surface at the connection plane via a connector rod placed in a V-shaped tube that is embedded into the concrete. Energy dissipation is provided by friction between a special washer located around the V-shaped tube and a top plate. Because of the period elongation due to the isolation layer and the limited amount of force transferred by the relatively flexible connector rod, bridge columns are protected from experiencing damage, thus leading to improved seismic behavior. The V-connector system also facilitates the ABC by allowing on-site assembly of prefabricated structural parts including those of the V-connector. A single-column, two-span highway bridge located in Northern California was used for the proof-of-concept of the proposed V-connector protective system. The V-connector was designed to result in an elastic bridge response based on nonlinear dynamic analyses of the bridge model with the V-connector. Accordingly, a one-third scale V-connector was fabricated based on a set of selected design parameters. A quasi-static cyclic test was first conducted to characterize the force-displacement relationship of the V-connector, followed by a hybrid simulation (HS) test in the longitudinal direction of the bridge to verify the intended linear elastic response of the bridge system. In the HS test, all bridge components were analytically modeled except for the V-connector, which was simulated as the experimental substructure in a specially designed and constructed test setup. Linear elastic bridge response was confirmed according to the HS results. The response of the bridge with the V-connector was compared against that of the as-built bridge without the V-connector, which experienced significant column damage. These results justified the effectiveness of this innovative device. The second part of the study presents the HS test conducted on a one-third scale two-column bridge bent with self-centering columns (broadly defined as “resilient columns” in this study) to reduce (or ultimately eliminate) any residual drifts. The comparison of the HS test with a previously conducted shaking table test on an identical bridge bent is one of the highlights of this study. The concept of resiliency was incorporated in the design of the bridge bent columns characterized by a well-balanced combination of self-centering, rocking, and energy-dissipating mechanisms. This combination is expected to lead to minimum damage and low levels of residual drifts. The ABC is achieved by utilizing precast columns and end members (cap beam and foundation) through an innovative socket connection. In order to conduct the HS test, a new hybrid simulation system (HSS) was developed, utilizing commonly available software and hardware components in most structural laboratories including: a computational platform using Matlab/Simulink [MathWorks 2015], an interface hardware/software platform dSPACE [2017], and MTS controllers and data acquisition (DAQ) system for the utilized actuators and sensors. Proper operation of the HSS was verified using a trial run without the test specimen before the actual HS test. In the conducted HS test, the two-column bridge bent was simulated as the experimental substructure while modeling the horizontal and vertical inertia masses and corresponding mass proportional damping in the computer. The same ground motions from the shaking table test, consisting of one horizontal component and the vertical component, were applied as input excitations to the equations of motion in the HS. Good matching was obtained between the shaking table and the HS test results, demonstrating the appropriateness of the defined governing equations of motion and the employed damping model, in addition to the reliability of the developed HSS with minimum simulation errors. The small residual drifts and the minimum level of structural damage at large peak drift levels demonstrated the superior seismic response of the innovative design of the bridge bent with self-centering columns. The reliability of the developed HS approach motivated performing a follow-up HS study focusing on the transverse direction of the bridge, where the entire two-span bridge deck and its abutments represented the computational substructure, while the two-column bridge bent was the physical substructure. This investigation was effective in shedding light on the system-level performance of the entire bridge system that incorporated innovative bridge bent design beyond what can be achieved via shaking table tests, which are usually limited by large-scale bridge system testing capacities.
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Gunay, Selim, Fan Hu, Khalid Mosalam, Arpit Nema, Jose Restrepo, Adam Zsarnoczay et Jack Baker. Blind Prediction of Shaking Table Tests of a New Bridge Bent Design. Pacific Earthquake Engineering Research Center, University of California, Berkeley, CA, novembre 2020. http://dx.doi.org/10.55461/svks9397.

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Considering the importance of the transportation network and bridge structures, the associated seismic design philosophy is shifting from the basic collapse prevention objective to maintaining functionality on the community scale in the aftermath of moderate to strong earthquakes (i.e., resiliency). In addition to performance, the associated construction philosophy is also being modernized, with the utilization of accelerated bridge construction (ABC) techniques to reduce impacts of construction work on traffic, society, economy, and on-site safety during construction. Recent years have seen several developments towards the design of low-damage bridges and ABC. According to the results of conducted tests, these systems have significant potential to achieve the intended community resiliency objectives. Taking advantage of such potential in the standard design and analysis processes requires proper modeling that adequately characterizes the behavior and response of these bridge systems. To evaluate the current practices and abilities of the structural engineering community to model this type of resiliency-oriented bridges, the Pacific Earthquake Engineering Research Center (PEER) organized a blind prediction contest of a two-column bridge bent consisting of columns with enhanced response characteristics achieved by a well-balanced contribution of self-centering, rocking, and energy dissipation. The parameters of this blind prediction competition are described in this report, and the predictions submitted by different teams are analyzed. In general, forces are predicted better than displacements. The post-tension bar forces and residual displacements are predicted with the best and least accuracy, respectively. Some of the predicted quantities are observed to have coefficient of variation (COV) values larger than 50%; however, in general, the scatter in the predictions amongst different teams is not significantly large. Applied ground motions (GM) in shaking table tests consisted of a series of naturally recorded earthquake acceleration signals, where GM1 is found to be the largest contributor to the displacement error for most of the teams, and GM7 is the largest contributor to the force (hence, the acceleration) error. The large contribution of GM1 to the displacement error is due to the elastic response in GM1 and the errors stemming from the incorrect estimation of the period and damping ratio. The contribution of GM7 to the force error is due to the errors in the estimation of the base-shear capacity. Several teams were able to predict forces and accelerations with only moderate bias. Displacements, however, were systematically underestimated by almost every team. This suggests that there is a general problem either in the assumptions made or the models used to simulate the response of this type of bridge bent with enhanced response characteristics. Predictions of the best-performing teams were consistently and substantially better than average in all response quantities. The engineering community would benefit from learning details of the approach of the best teams and the factors that caused the models of other teams to fail to produce similarly good results. Blind prediction contests provide: (1) very useful information regarding areas where current numerical models might be improved; and (2) quantitative data regarding the uncertainty of analytical models for use in performance-based earthquake engineering evaluations. Such blind prediction contests should be encouraged for other experimental research activities and are planned to be conducted annually by PEER.
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Financial Stability Report - Second Semester of 2021. Banco de la República, septembre 2022. http://dx.doi.org/10.32468/rept-estab-fin.sem2.eng-2021.

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Banco de la República’s main objective is to preserve the purchasing power of the currency in coordination with the general economic policy that is intended to stabilize output and employment at long-term sustainable levels. Properly meeting the goal assigned to the Bank by the 1991 Constitution critically depends on preserving financial stability. This is understood to be a general condition in which the financial system assesses and manages the financial risks in a way that facilitates the economy’s performance and efficient allocation of resources while, at the same time, it is able to, on its own, absorb, dissipate, and mitigate the shocks that may arise as a result of adverse events. This Financial Stability Report meets the goal of giving Banco de la República’s diagnosis of the financial system’s and its debtors’ recent performance as well as of the main risks and vulnerabilities that could affect the stability of the Colombian economy. In this way, participants in financial markets and the public are being informed, and public debate on trends and risks affecting the system is being encouraged. The results presented here also serve the monetary authority as a basis for making decisions that will enhance financial stability in the general context of its objectives. In recent months, several positive aspects of the financial system have preserved a remarkable degree of continuity and stability: the liquidity and capital adequacy of financial institutions have remained well above the regulatory minimums at both the individual and consolidated levels, the coverage of past-due loans by loan-loss provisions remains high, and the financial markets for public and private debt and stocks have continued to function normally. At the same time, a surge in all the types of loan portfolios, a sharp downturn in the non-performing loan portfolio, and a rise in the profitability of credit institutions can be seen for the first time since the beginning of the pandemic. In line with the general recovery of the economy, the main vulnerability to the stability of the Colombian financial system identified in the previous edition—uncertainty about changes in the non-performing loans portfolio—has receded and remains on a downward trend. In this edition, the main source of vulnerability identified for financial stability in the short term is the system’s exposure to sudden changes in international financial conditions; the results presented in this Report indicate that the system is sufficiently resilient to such scenarios. In compliance with its constitutional objectives and in coordination with the financial system’s security network, Banco de la República will continue to closely monitor the outlook for financial stability at this juncture and will make the decisions necessary to ensure the proper functioning of the economy, facilitate the flow of sufficient credit and liquidity resources, and further the smooth functioning of the payment system. Leonardo Villar Gomez Governor Box 1 -Decomposition of the Net Interest Margin in Colombia and Chile Wilmar Cabrera Daniela Rodríguez-Novoa Box 2 - Spatial Analysis of New Home Prices in Bogota, Medellín, and Cali Using a Geostatistical Approach María Fernanda Meneses Camilo Eduardo Sánchez Box 3 - Interest Rate Model for the SYSMO Stress Test Exercise Wilmar Cabrera Diego Cuesta Santiago Gamba Camilo Gómez Box 4 - The Transition from LIBOR and other International Benchmark Rates Daniela X. Gualtero Briceño Javier E. Pirateque Niño
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