Academic literature on the topic 'Ondes couplées'
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Journal articles on the topic "Ondes couplées"
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Waiters, Wendell W. "Supra-Biological Factors in the Assessment of Males Seeking Penile Prostheses." Canadian Journal of Psychiatry 31, no. 1 (February 1986): 25–31. http://dx.doi.org/10.1177/070674378603100106.
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The technique of installing penile prostheses for treatment of erectile dysfunction in the male is becoming increasingly popular, particularly, but by no means exclusively in the cases of impotence in which biological factors are clearly implicated. The literature to date fails to take into account suprabiological factors such as the nature of the couple's sexual relationship and more particularly the sexual myths that shape their sexual behaviour. The author evaluated eight couples in which the male was seeking a penile prostheses and in all eight couples a variety of sexual myths had contributed to major sexual problems for the couple, even before the onset of the erectile dysfunction. A plea is made for discarding the false dichotomy or “organic” versus “functional”, in favour of a list of etiological factors including the biological ones as well as suprabiological ones. Also, the installation of penile implants should only be considered after a full investigation of the couple's sexuality by a competent sex therapist and only when other forms of couple/sex therapy have failed.
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Iooss, Gérard, and Klaus Kirchgässner. "Ondes progressives périodiques dans une chaîne d'oscillateurs non linéaires couplés." Comptes Rendus de l'Académie des Sciences - Series I - Mathematics 327, no. 9 (November 1998): 855–60. http://dx.doi.org/10.1016/s0764-4442(99)80118-9.
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Soriano-Ayala, Encarnación, Verónica C. Cala, Manuel Soriano Ferrer, and Herenia García-Serrán. "Love, relationships and couple happiness: A cross-cultural comparison among Spanish couples and Moroccan couples in Southern Spain." Interpersona: An International Journal on Personal Relationships 15, no. 1 (June 30, 2021): 72–89. http://dx.doi.org/10.5964/ijpr.4177.
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Love and relationships are sociocultural constructions that, in recent times, have experienced great changes in terms of type of relationship, type of love and happiness of the couple. Few studies have analysed the love relationships immigrant population in Europe. This study aims to explore the differences and similarities in love styles between Spaniards and Moroccan immigrants, the country’s largest foreign population, and analyse the relationship between these styles and level of couple happiness. This cross-sectional study disseminated a survey to young adults between the ages of 18 and 40 in southern Spain. Of those who received the survey, 574 young adults responded, of which 182 were of Moroccan origin and 392 were Spanish. The results indicated that there are sociocultural and gender differences in the types of relationships young adults maintain and in the agents that facilitate romantic socialisation. The Spaniards describe less stable relationships, more influenced by several agents, while the Moroccans demonstrated more stability in relationships, more influenced by family and religion. In accordance with Sternberg love components, different types of love were recognised. Spanish women are the group most value love in their lives, rated higher in couple happiness, and gave special importance to intimacy (but not to commitment and passion). Moroccan women followed models of love closer to Sternberg's romantic love, giving importance to commitment, intimacy and passion. Spanish men were similar to Moroccan men regarding their type of love, although they were the only ones that included commitment as a predictor of happiness. This study reveals that the importance of an intersectional approach to analyse love and couples.
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Gruszczynski, Slawomir, Robert Smolarz, and Krzysztof Wincza. "Differential Bi-Level Microstrip Directional Coupler with Equalized Coupling Coefficients for Directivity Improvement." Electronics 9, no. 4 (March 25, 2020): 547. http://dx.doi.org/10.3390/electronics9040547.
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In this paper, a bi-level microstrip differential directional coupler has been investigated. It has been shown that the equalization of coupling coefficients can be successfully made with the use of appropriate dielectric stack-up and conductor geometry. The application of additional top dielectric layer can ensure proper equalization of coupling coefficients by lowering the value of capacitive coupling coefficient to the value of the inductive one. The theoretically investigated coupled-line section has been used for the design of a 3-dB differential directional coupler. The measurement results are compared with the theoretical ones.
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Li, Tatsien, and Bopeng Rao. "Sur l'état de synchronisation exacte d'un système couplé d'équations des ondes." Comptes Rendus Mathematique 352, no. 10 (October 2014): 823–29. http://dx.doi.org/10.1016/j.crma.2014.08.007.
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Erdoğan, E. "Zero product preserving bilinear operators acting in sequence spaces." Carpathian Mathematical Publications 12, no. 1 (June 19, 2020): 55–68. http://dx.doi.org/10.15330/cmp.12.1.55-68.
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Consider a couple of sequence spaces and a product function $-$ a canonical bilinear map associated to the pointwise product $-$ acting in it. We analyze the class of "zero product preserving" bilinear operators associated with this product, that are defined as the ones that are zero valued in the couples in which the product equals zero. The bilinear operators belonging to this class have been studied already in the context of Banach algebras, and allow a characterization in terms of factorizations through $\ell^r(\mathbb{N})$ spaces. Using this, we show the main properties of these maps such as compactness and summability.
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Shahhossiani Tajik, Saeed, Masoumah Sayyadi, and Najmeh Taheri. "Marital Commitment and Relationship Quality in Fertile and Infertile Couples." Quarterly of the Horizon of Medical Sciences 25, no. 3 (July 1, 2019): 184–97. http://dx.doi.org/10.32598/hms.25.3.184.
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Aims Infertility is among the main problems in a marriage. It is associated with various psychological consequences, including the inability to establish a quality couple relationship as well as an unstable marital commitment. The present study aimed to investigate marital commitment and the relationship quality in fertile and infertile couples in 2016-2017. Methods & Materials This was an analytical cohort study. The statistical population consisted of all couples admitting to Sarem subspecialty Hospital in 2016. Two hundred people (96 infertile, 104 fertile) have been randomly selected as the samples. The completed the marital commitment and the relation to quality scales. After checking the normality of the data, the statistical analysis was performed using Pearson’s correlation coefficient, Student t-test, and Multivariate Analysis of Variance (MANOVA). Findings The obtained data revealed a significant positive association between marital commitment and relationship quality in fertile and infertile couples (r=0.27 and r=0.18, respectively) (P<0.05). However, this association was stronger in the fertile couples, compared with the infertile ones (relationship quality and marital commitment: P<0.0121 and P<0.0416, respectively). Moreover, the Student t-test and MANOVA results indicated significant differences in relationship quality and marital commitment between the two groups (P<0.0001 and P<0.002, respectively). Conclusion Infertility reduces couples’ commitment and negatively affects the quality of their relationships.
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Miller, Warren B., and David J. Pasta. "Behavioral Intentions: Which Ones Predict Fertility Behavior in Married Couples?1." Journal of Applied Social Psychology 25, no. 6 (March 1995): 530–55. http://dx.doi.org/10.1111/j.1559-1816.1995.tb01766.x.
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Bobic, Mirjana, and Milena Stanojevic. "Transition from marrage into parenthood: Discourses and practice - dyadic perspective." Sociologija 56, no. 4 (2014): 427–44. http://dx.doi.org/10.2298/soc1404427b.
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This paper stems from grounded theory applied on evidence gathered together by interviews and observations of 30 couples (60 men and women) from Belgrade. The field research has been a part of a wider one named Policy of Parenthood, carried out in 2013/14, by the Institute for sociological research of the Faculty of Philosophy. We deployed methodological individualism, aimed at conceptualizing various behavioral patterns of couples undergoing major transition from marriage into parenthood. We first undertook in depth analysis of all couples, who represented a variety of coping strategies throughout three main phases: before childbirth (preparatory phase), childbearing (central phase) and aftermath (reconstitution of a group). We have then selected three couples, which identify specific modes of ?crisis management? following family transformation. Couples were given specific labels conveying clear meanings as of their prevalent behavioral styles: the first one - ?intelligentsia?, the second one - very proactive, ?strategists? and finally - ?defeatists?. In this paper, unlike vast majority of domestic qualitative researches and case studies, the three couples were analyzed as a whole, thus gradually and integrally disclosing their life phases and social biographical context. The prior insight into the overall evidence enabled us to construct semantic units (nodes) and subordinated codes, latter ones covering concrete meanings conveyed by couples (dimensions). Interpretation of each and every couple is followed by a comparative discussion of (dis)similarities of their sentiments, behaviors and action potentials. Our main idea was to demonstrate as to what extent individuals and couples critically reflect upon themselves, their partnership, and life course; what is their reference toward current and future state of affairs. We also investigated whether they clearly pose any specific prospective goal in terms of personal and social advancement and if so, which strategy do they intend to enact. Our research was also undertaken with the goal to assess ability of a couple to establish a control over itself and social settings along with the social stress. We deemed it as a way partners and individuals dispose their personal capacity for change, i.e. active social integration in ever changing environment, which is, supposedly, belated but necessary individual strategy for globally running second modernization.
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Li, Tatsien, and Bopeng Rao. "Synchronisation exacte dʼun système couplé dʼéquations des ondes par des contrôles frontières de Dirichlet." Comptes Rendus Mathematique 350, no. 15-16 (August 2012): 767–72. http://dx.doi.org/10.1016/j.crma.2012.09.007.
Full textDissertations / Theses on the topic "Ondes couplées"
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Lugo, Alvarez Jose. "Lignes couplées à ondes lentes intégrées sur silicium en bande millimétrique - Application aux coupleurs, filtres et baluns." Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GREAT121/document.
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L’objectif de ce travail de thèse est le développement en technologie intégrée standard d’une structure de ligne de transmission optimisée en termes de pertes, d’encombrement, de facteur de qualité et surtout du choix du niveau de couplage aux fréquences millimétriques. Cette structure a été nommée CS-CPW (Coupled Slow-wave CoPlanar Waveguide). Dans un premier temps, la théorie ainsi que les modèles électriques des CS-CPW sont présentés. Grâce aux modèles et aux simulations électromagnétiques, des coupleurs directionnels avec plusieurs valeurs de couplage (3 dB, 10 dB, 18 dB) ont été conçus en technologie BiCMOS 55 nm. Ils présentent tous une très bonne directivité, elle est toujours supérieure à 15 dB. Un premier prototype de coupleur a été mesuré à 150 GHz. Dans un deuxième temps, des filtres à la base des lignes couplées ont été développés à 80 GHz en utilisant des lignes CS-CPW. Les résultats des simulations présentent des résultats concurrentiels avec l’état de l’art : 11% de bande passante relative et un facteur non-chargé autour de 25. Finalement, trois projets ont démarré à la base de ces lignes. Ces projets sont actuellement utilisés dans deux travaux de thèse et un stage : un RTPS à 47 GHz, un isolateur à 75 GHz et un balun à 80 GHzThis work focuses on high-performances CS-CPW (Coupled Slow-wave CoPlanar Waveguide) transmission lines in classical CMOS integrated technologies for the millimiter-wave frequency band. First, the theory as well as the electrical models of the CS-CPW are presented. Thanks to the models and electromagnetic simulations, directional couplers with different coupling levels (3 dB, 10 dB, 18 dB) were designed in BiCMOS 55 nm technology. They have a good directivity, always better than 15 dB. A first prototype of a coupler was measured at 150 GHz presenting good agreement with the simulations. Next, coupled-line base filters were developed at 80 GHz using the CS-CPWs. Simulation present competitive results with the state-of-art: 11% of fractional bandwidth and a unload quality factor of 25. Finally, three projects started based on the CS-CPWs. The projects are currently used in two theses and one internship: a RTPS at 47 GHz, an isolator at 75 GHz and a balun at 80 GHz
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Bassam, Maya. "Étude de la stabilité de quelques systèmes d'équations des ondes couplées sur des domaines bornés et non bornés." Thesis, Valenciennes, 2014. http://www.theses.fr/2014VALE0034/document.
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La thèse est portée essentiellement sur la stabilisation indirecte d’un système de deux équations des ondes couplées et sur la stabilisation frontière de poutre de Rayleigh.Dans le cas de la stabilisation d’un système d’équations d’onde couplées, le contrôle est introduit dans le système directement sur le bord du domaine d’une seule équation dans le cas d’un domaine borne ou à l’intérieur d’une seule équation mais dans le cas d’un domaine non borné. La nature du système ainsi couplé dépend du couplage des équations et de la nature arithmétique des vitesses de propagations, et ceci donne divers résultats pour la stabilisation polynomiale ainsi la non stabilité.Dans le cas de la stabilisation de poutre de Rayleigh, l’équation est considérée avec un seul contrôle force agissant sur bord du domaine. D’abord, moyennant le développement asymptotique des valeurs propres et des vecteurs propres du système non contrôlé, un résultat d’observabilité ainsi qu’un résultat de bornétude de la fonction de transfert correspondant sont obtenus. Alors, un taux de décroissance polynomial de l’énergie du système est établi. Ensuite, moyennant une étude spectrale combinée avec une méthode fréquentielle, l’optimalité du taux obtenu est assuréeThe thesis is driven mainly on indirect stabilization system of two coupled wave equations and the boundary stabilization of Rayleigh beam equation. In the case of stabilization of a coupled wave equations, the Control is introduced into the system directly on the edge of the field of a single equation in the case of a bounded domain or inside a single equation but in the case of an unbounded domain. The nature of thus coupled system depends on the coupling equations and arithmetic Nature of speeds of propagation, and this gives different results for the polynomial stability and the instability. In the case of stabilization of Rayleigh beam equation, we consider an equation with one control force acting on the edge of the area. First, using the asymptotic expansion of the eigenvalues and vectors of the uncontrolled system an observability result and a result of boundedness of the transfer function are obtained. Then a polynomial decay rate of the energy of the system is established. Then through a spectral study combined with a frequency method, optimality of the rate obtained is assured
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Bitauld, David. "Association d'un réseau de diffraction à un réseau de Bragg intracavité pour le filtrage optique accordable." Paris 11, 2005. http://www.theses.fr/2005PA112259.
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Le développement du multiplexage en longueur d'onde dans les télécommunications optiques nécessite l'utilisation de filtres rapidement accordables et ayant une bonne sélectivité. La technique proposée dans cette thèse consiste en l'association d'un réseau de diffraction et d'un réseau de Bragg intracavité. Ce principe a été implémenté en deux montages expérimentaux. Le premier utilise un réseau intracavité inscrit sur cristaux liquides, le second un réseau de Bragg acousto-optique. Le dispositif à cristaux liquides permet d'obtenir un filtre avec une bande passante de 0,09nm. Cette sélectivité est satisfaisante cependant la méthode utilisée ne permet pas de faire varier sa période et donc d'accorder le filtre. L'acousto-optique, en revanche, est une technologie déjà bien maîtrisée et qui permet d'incrire des réseaux d'indice dont la période peut être modifiée très rapidement (~µs). Le dispositif que nous avons réalisé avec une cellule acousto-optique permet d'obtenir une bande passante de 0,076nm avec un rapport signal à bruit de 20dB. Ce filtre est accordable sur une gamme de 2,2nm, ce qui permet de distinguer 30 longueurs d'ondes. La bande passante du filtre ainsi que sa gamme d'accord sont très facilement adaptables en changeant l'orientation ou le pas du réseau de diffraction. Afin de modéliser le principe de filtrage, une simulation en faisceau gaussien a été développée. Elle est en bon accord avec les résultats expérimentaux et nous permet de prévoir les performances qu'il est possible d'obtenir avec d'autres réseaux de Bragg. Par exemple, en remplaçant la cellule acousto-optique, il est possible d'obtenir un filtre capable de séparer 500 longueurs d'ondesThe constant growth of the needs in data transmission rates has led to the development of wavelength division multiplexing (WDM). The demultiplexing associated with WDM requires very selective filters with fast tuning possibilities. In this thesis, we propose a filtering technique associating a diffraction grating with an intracavity Bragg grating. Two filters have been implemented experimentally using this principle: one using a liquid crystal intracavity grating and one using an acousto-optic Bragg grating. The liquid crystal device has a bandwidth of 0. 09nm, which is very interesting but this technique does not allow to tune the filter. A tunable Bragg grating can be implemented using the acousto-optic effect. The device we made using an acousto-optic cell has a bandwidth of 0. 076nm with a signal to noise ratio of 20dB. This filter is tunable on a range of 2. 2nm, which allows to separate 30 wavelengths. The bandwidth and the tuning range can be easily adapted by changing the diffraction grating's orientation or its period. A numerical simulation of the response of the filter for a gaussian beam has been developped and it fits the experimental results. It allows us to calculate the performances that could be obtained with filters designed differently. For example, replacing our acoust-optic cell by one with a wider active medium (commercially available) would allow us to separate 500 frequencies. It would then be possible to have a tuning range of 100nm with a bandwidth of 0. 2nm
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Koumaiha, Marwa. "Analyse numérique pour les équations de Hamilton-Jacobi sur réseaux et contrôlabilité / stabilité indirecte d'un système d'équations des ondes 1D." Thesis, Paris Est, 2017. http://www.theses.fr/2017PESC1122/document.
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Cette thèse est composée de deux parties dans lesquelles nous étudions d'une part des estimations d'erreurs pour des schémas numériques associés à des équations de Hamilton-Jacobi du premier ordre. D'autre part, nous nous intéressons a l'étude de la stabilité et de la contrôlabilité exacte frontière indirecte des équations d'onde couplées.Dans un premier temps, en utilisant la technique de Crandall-Lions, nous établissons une estimation d'erreur d'un schéma numérique monotone aux différences finies pour des conditions de jonction dites a flux limité, pour une équation de Hamilton-Jacobi du premier ordre. Ensuite, nous montrons que ce schéma numérique peut être généralisé à des conditions de jonction générales. Nous établissons alors la convergence de la solution discrétisée vers la solution de viscosité du problème continu. Enfin, nous proposons une nouvelle approche, à la Crandall-Lions, pour améliorer les estimations d'erreur déjà obtenues, pour une classe des Hamiltoniens bien choisis. Cette approche repose sur l'interprétation du type contrôle optimal de l'équation de Hamilton-Jacobi considérée.Dans un second temps, nous étudions la stabilisation et la contrôlabilité exacte frontière indirecte d'un système monodimensionnel d’équations d'ondes couplées. D'abord, nous considérons le cas d'un couplage avec termes de vitesses, et par une méthode spectrale, nous montrons que le système est exactement contrôlable moyennant un seul contrôle à la frontière. Les résultats dépendent de la nature arithmétique du quotient des vitesses de propagation et de la nature algébrique du terme de couplage. De plus, ils sont optimaux. Ensuite, nous considérons le cas d'un couplage d'ordre zéro et nous établissons un taux polynômial optimal de la décroissance de l'énergie. Enfin, nous montrons que le système est exactement contrôlable moyennant un seul contrôle à la frontièreThe aim of this work is mainly to study on the one hand a numerical approximation of a first order Hamilton-Jacobi equation posed on a junction. On the other hand, we are concerned with the stability and the exact indirect boundary controllability of coupled wave equations in a one-dimensional setting.Firstly, using the Crandall-Lions technique, we establish an error estimate of a finite difference scheme for flux-limited junction conditions, associated to a first order Hamilton-Jacobi equation. We prove afterwards that the scheme can generally be extended to general junction conditions. We prove then the convergence of the numerical solution towards the viscosity solution of the continuous problem. We adopt afterwards a new approach, using the Crandall-Lions technique, in order to improve the error estimates for the finite difference scheme already introduced, for a class of well chosen Hamiltonians. This approach relies on the optimal control interpretation of the Hamilton-Jacobi equation under consideration.Secondly, we study the stabilization and the indirect exact boundary controllability of a system of weakly coupled wave equations in a one-dimensional setting. First, we consider the case of coupling by terms of velocities, and by a spectral method, we show that the system is exactly controllable through one single boundary control. The results depend on the arithmetic property of the ratio of the propagating speeds and on the algebraic property of the coupling parameter. Furthermore, we consider the case of zero coupling parameter and we establish an optimal polynomial energy decay rate. Finally, we prove that the system is exactly controllable through one single boundary control
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Toufayli, Laila. "Stabilisation polynomiale et contrôlabilité exacte des équations des ondes par des contrôles indirects et dynamiques." Phd thesis, Université de Strasbourg, 2013. http://tel.archives-ouvertes.fr/tel-00780215.
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La thèse est portée essentiellement sur la stabilisation et la contrôlabilité de deux équations des ondes moyennant un seul contrôle agissant sur le bord du domaine. Dans le cas du contrôle dynamique, le contrôle est introduit dans le système par une équation différentielle agissant sur le bord. C'est en effet un système hybride. Le contrôle peut être aussi applique directement sur le bord d'une équation, c'est le cas du contrôle indirecte mais non borne. La nature du système ainsi coupledépend du couplage des équations, et ceci donne divers résultats par la stabilisation (exponentielle et polynomiale) et la contrôlabilité exacte (espace contrôlable). Des nouvelles inégalités d'énergie permettent de mettre en oeuvre la Méthode fréquentielle et la Méthode d'Unicité de Hilbert.
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Ponchel, Freddy. "ELFI : calculateur électromagnétique pour l'établissement de schémas électriques équivalents aux interconnexions "cuivre" couplées et pour la caractérisation des matériaux." Lille 1, 2007. https://pepite-depot.univ-lille.fr/LIBRE/Th_Num/2007/50376-2007-221.pdf.
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Les travaux décrits dans ce mémoire concernent la mise en œuvre d'un code de calcul électromagnétique d'éléments finis à éléments d'arêtes nommé ELFI, et ce, en deux dimensions. Après une importante phase de validation, la méthode des éléments finis est, dans un premier temps, appliquée à l'étude de trois, cinq et huit interconnexions "cuivre" , à pertes, constituant les différents niveaux de métallisation d'un circuit intégré. Les schémas électriques équivalents à ces trois systèmes sont ensuite implantés sous SPICE pour étudier les évolutions des temps de montée et de retard de propagation des signaux ainsi que le comportement de la diaphonie. Ceci est effectué en fonction de la distance séparant les connexions et en fonction de la nature des matériaux remplissant les zones de couplage. L'influence des lignes passives (les victimes) est alors clairement identifiée en présence d'une ligne active (l'agresseur) et réciproquement. Notre code de calcul est ensuite modifié puis adapté pour constituer une aide à la détermination de la permittivité diélectrique complexe du titano-zirconate de plomb (le PZT) dans la bande 1 à 26 GHz. Les impacts du posé des pointes de mesure, de la conductivité des métallisations coplanaires, de la variation de l'épaisseur de la couche de PZT ainsi que celle du tenseur de permittivité du substrat saphir qui supporte les lignes sont, tour à tour, analysées. Cette étude de sensibilité montre que l'on détermine, à ce jour, pour ce matériau polycristallin sans orientation particulière une permittivité relative de l'ordre de 1500 à ± 5% dans le meilleur cas de figure.
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Hu, Long. "Contrôle frontière, stabilisation et synchronisation pour des systèmes de lois de bilan en dimension un d'espace." Thesis, Paris 6, 2015. http://www.theses.fr/2015PA066401/document.
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Cette thèse est consacrée à trois sujets dans le domaine du contrôle, qui sont la contrôlabilité exacte frontière, la stabilisation frontière et la synchronisation exacte frontière, des systèmes hyperboliques de lois de bilan. Pour la partie sur la contrôlabilité exacte frontière, on améliore le temps de contrôlabilité exacte pour les systèmes hyperboliques de lois de conservation pour des conditions aux limites générales. On montre aussi que ce temps est optimal. En ce qui concerne les systèmes hyperboliques couplés avec une vitesse caractéristique nulle, nous prouvons que l'on n'a pas la contrôlabilité exacte, même avec des couplages internes dans les équations. Cependant, on montre que l'on peut stabiliser les systèmes par les lois de rétroaction à la frontière du domaine. Dans la deuxième partie, nous nous intéressons à la stabilisation frontière des systèmes hyperboliques de lois de bilan. En utilisant une approche "backstepping", on montre comment stabiliser des systèmes d'abord dans les cas linéaires puis dans les cas quasi-lin éaires. La troisième partie concerne la synchronisation exacte frontière. Nous rappelons d'abord les résultats de contrôlabilité et d'observabilité exacte frontière pour les systèmes couplés d' équations des ondes quasi-linéaires. Puis nous introduisons plusieurs types de synchronisations pour un système d' équations des ondes linéaires, puis quasi-linéaires, couplées avec des conditions aux limites de type Dirichlet, de type Neumann, de type Robin et de type dissipatif dans le cadre de solutions de classe C2. Nous montrons que toutes ces synchronisations peuvent être réalisées en imposant peu de contrôles aux frontièresThis thesis is devoted to three topics in the control field, namely, exact boundary controllability, boundary stabilization and exact boundary synchronization, for hyperbolic systems of balance laws. For the exact boundary controllability part, we first improve the boundary control time for hyperbolic systems of conservation laws with general boundary conditions and show that this control time is sharp. Then for a coupled hyperbolic system with zero characteristic speed, we prove that it is impossible to achieve the corresponding exact boundary controllability even with inner couplings in the equation. However, one can stabilize the system in infinite time by means of boundary feedback laws. For the boundary stabilization part, we show how to stabilize both the n×n linear and quasilinear hyperbolic systems by means of one-sided closed-loop boundary controls. For that a backstepping method is developed. For the exact boundary synchronization part, we first recall both the exact boundary controllability and observability results for coupled systems of quasilinear wave equations. Then several kinds of exact synchronizations are introduced for a coupled system of 1-D linear and quasilinear wave equations with boundary conditions of Dirichlet type, Neumann type, coupled third type and coupled dissipative type in the framework of C2 solutions. We show that all these synchronizations can be realized by means of few boundary controls
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Nguyen, Thi Thuy Hanh. "Analyses des perturbations synoptiques et de la modulation diurne des systèmes convectifs sur l'Afrique centrale." Paris 6, 2007. http://www.theses.fr/2007PA066638.
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Cette thèse présente des perturbations synoptiques de la convection sur l'Afrique centrale. On montre les perturbations intermittentes de 3-6 jours de la convection pendant les saisons humides, en particulier entre mars et avril. Pour cette saison, ces perturbations sont principalement dues à un couplage entre l'activité convective et les ondes équatoriales de Kelvin. Il a été constaté que ces perturbations qui se propagent vers l'est, sont composées de systèmes convectifs de méso-échelle (SCM) qui se propagent vers l'ouest. En effet, le passage de l'onde de Kelvin provoque une forte augmentation de la haute nébulosité associée aux nuages convectifs, de l'occurrence des SCM de petite taille sur et près des reliefs et des gros SCM particulièrement sur le bassin du Congo, et de la taille et la durée de vie des SCM. Ces résultats suggèrent une meilleure organisation diurne de la convection et donc une meilleure propagation des SCM lors du passage de l'onde.
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Le, Roy Marc. "Analyse et optimisation de lignes de transmission à variation continue d'impédance : application au filtrage." Phd thesis, Université de Bretagne occidentale - Brest, 1999. http://tel.archives-ouvertes.fr/tel-00468594.
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La modélisation numérique des équations de Maxwell n'étant pas facilement utilisable pour la conception de tous les circuits hyperfréquences, il apparaît important de développer en parallèle des méthodes d'analyse et de synthèse de dispositifs micro-ondes fondées sur la théorie des circuits. Pour conserver ce type d'approche, une minimisation des différents problèmes parasites doit être respectée. En effet, l'un des problèmes inhérents aux réseaux à lignes de transmission est la modélisation des discontinuités entre les différentes largeurs de ligne. Ce problème devient important dans la conception de filtres planaires. Nous définissons une structure initiale exempte de tels sauts d'impédance, ce qui permet de conserver, par rapport à des structures classiques, une configuration optimale à des fréquences supérieures. La 1ère partie théorique décrit la méthode originale construite à partir d'outils mathématiques simples et “ portables ”, pour l'analyse de lignes de transmission à variation continue d'impédance. Dans la 2ème partie, consacrée à la réalisation de filtres passe-bas et coupe bande, les avantages de la méthode sont mis en avant. Le réseau à variation continue d'impédance présente, de part sa structure même, un nombre supérieur de degrés de liberté par rapport aux réseaux classiques. Ce principe est mis en application pour générer des filtres passe-bas à bandes atténuées élargies. La souplesse et la précision de la méthode en font un outil intéressant pour la réalisation de filtres passe-bande à partir de lignes couplées en technologie microruban. Dans la dernière partie, l'approche est d'abord utilisée pour compenser la dégradation de la réponse du filtre, due à la configuration microruban. Les degrés de liberté de la méthode utilisée étape par étape permettent ensuite la conception de filtres passe-bande complexes avec de larges bandes de réjection.
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Raguin, Laetitia. "Résonateurs phononiques couplés par la surface." Thesis, Bourgogne Franche-Comté, 2019. http://www.theses.fr/2019UBFCD047.
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Ces travaux de thèse visent à étudier des résonateurs mécaniques capables de confiner, contrôler et transporter l’énergie acoustique à l’échelle du micromètre. L’approche proposée consiste à exploiter la surface sur laquelle reposent les résonateurs et les phénomènes d’hybridation entre les ondes élastiques se propageant sur cette surface et les modes propres des résonateurs pour créer un couplage entre résonateurs. Dans un premier temps, les travaux entrepris prouvent, numériquement et expérimentalement, la capacité d’exciter un micro-résonateur sub-longueur d’onde grâce aux ondes de surface. Une seconde partie est consacrée à l’étude des mécanismes de couplage entre résonateurs adjacents.Au travers de caractérisations optiques donnant notamment accès à la forme des modes excités et de simulations numériques fondées sur la méthode des éléments finis, la présence de couplage entre résonateurs voisins et la possibilité de contrôler ce couplage en modifiant les paramètres géométriques des paires de résonateurs sont démontrées. En particulier, deux types de couplage sont mis en évidence en fonction de l’écartement entre les résonateurs : un couplage évanescent, s’apparentant au couplage dans un dimère plasmonique, et un couplage de type mécanique. Les études réalisées soulignent aussi la réciprocité des systèmes étudiés : il est possible de modifier le couplage en changeant les conditions d’excitation des résonateurs et réciproquement, les vibrations des résonateurs couplés peuvent affecter la vibration de la surface les supportant à des échelles très sub-longueurs d’ondeIn the field of Phononics, most of the works reported up to now investigate the collective behaviour of periodic or aperiodic structures in order to control the propagation of elastic waves. In this thesis work, we propose to focus on the individual character of surface-coupled mechanical resonators with the aim to control and manipulate vibrations at the micron-scale. We investigate numerically and experimentally the coupling mechanisms involved between surface acoustic waves propagating on a substrate surface and mechanical modes of sub-wavelength phononic microresonators. Experimental investigations are conducted on isolated resonators and on pairs of neighboring resonators. The microresonator motion is measured using a laser scanning heterodyne interferometer which allows obtaining the frequency response and observing the vectorial behaviour of the elastic field both in the resonator and at the substrate surface.In the first part of this thesis work, we demonstrate the possibility to excite the first flexural natural mode of a resonator with surface acoustic waves. Then, the reported investigations reveal the existence of two coupling regimes in pairs of resonating pillars, depending on the separation distance between two resonators: an evanescent coupling regime, much reminiscent of what can be observed in a plasmonic dimer, and a classical mechanical coupling. Measurements performed at the substrate surface also highlight the interaction through the surface between the resonators.The obtained results prove that it is possible to control the elastic energy distribution at a deep sub-wavelength scale with isolated resonators, and reciprocally, that mechanical resonator systems can be manipulated by propagating surface acoustic waves, hence opening prospects for the dynamic and coherent control of mechanical vibrations at the micron-scale
Books on the topic "Ondes couplées"
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The LGBT & modern family money manual: Financial strategies for you and your loved ones. 2015.
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Auerbach, Jeff. Irritating the Ones You Love: The Down and Dirty Guide to Better Relationships. Cedar Fort, 2002.
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Slep, Amy M. Smith, Richard E. Heyman, and Michael F. Lorber. Coercive Process and Intimate Partner Violence in Committed Relationships. Edited by Thomas J. Dishion and James Snyder. Oxford University Press, 2015. http://dx.doi.org/10.1093/oxfordhb/9780199324552.013.15.
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This chapter proposes a unifying explanation to two questions: Why do people persist in exhibiting angry, coercive escalating behaviors toward family members despite the unpleasant and destructive qualities of the behavior and despite the fact that such behaviors typically violate personal and societal norms about how to treat loved ones? How are some people able to deescalate out of angry conflict in a way that strengthens, rather than corrodes, their relationships? It posits an integrative model of the mechanisms that control dyadic anger escalation and deescalation in couples’ conflict and examines evidence from studies that have tested it. It reviews the extant literature pertinent to coercion in couples’ interactions and intimate partner violence and discusses the results of a study intended to test and extend the coercion model in couples.
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Easter, Personal Taste. Why Don't Easter Bunnies Lay Chocolate Easter Eggs Instead of Plastic Ones? Happy Easter!: Funny Easter Day Notebook Gift for Boyfriend, Girlfriend, Husband, Wife, Couples Who Love Easter Day Amazing Design and High Quality Cover and Paper. Independently Published, 2020.
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Pollard, Brian J. Muscle relaxants in critical illness. Oxford University Press, 2016. http://dx.doi.org/10.1093/med/9780199600830.003.0047.
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The place of neuromuscular blocking agents in the intensive care unit (ICU) has changed markedly over the last 20 years. Originally regarded as a mainstay of the process of ‘sedation’, they are now only used for specific indications. The principal disadvantage is probably the difficulty in neurological assessment when a muscle relaxant is used coupled with the increased risk of awareness, because inadequate sedation will be masked. Of the available agents, the intermediate acting ones are the most popular. The degree of relaxation can be readily controlled and they have few side effects. In the presence of renal and/or hepatic disease atracurium or cisatracurium are preferred. Succinylcholine is only used for securing the airway due to its very rapid onset of action. Rocuronium given in a higher dose also possesses a rapid onset in situations when succinylcholine might be contraindicated. When using a muscle relaxant, its effect should always be monitored with a simple train of four pattern of stimulation from a hand-held nerve stimulator. This will ensure that an adequate and not excessive block is secured. If a more rapid reversal is required then a dose of neostigmine with glycopyrrolate may be used. Alternatively, if rocuronium is the relaxant in use then the new agent sugammadex is effective.
Book chapters on the topic "Ondes couplées"
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Islas, Paul Moch, Anne K. Calef, and Cristina Aparicio. "2013 Mexico’s Education Reform: A Multi-dimensional Analysis." In Implementing Deeper Learning and 21st Education Reforms, 79–107. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-57039-2_4.
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Abstract The 2013 education reform to Mexico’s education system had two main goals, one explicit, to improve the quality of education and one implicit, to reassert federal authority over the education sector. Beginning with institutional and political mechanisms that introduced evaluations to the teaching profession, the reform sought a shift in Mexican educational culture. This chapter will begin by analyzing Mexico in international and domestic contexts to understand the urgency of the reform. It will then use Reimers (2020b and 2020c) five perspectives on education change to analyze the reform and evaluate the sequence in which it was implemented. The chapter concludes by outlining the results of the reform to date and summarizing the relationship between the five perspectives. Ultimately, we argue that the initial deprioritization of technical aspects, including pedagogical and curricular ones, stymied the cultural shift towards an educational model grounded in twenty-first century competencies that the reform sought. When coupled with a limited political cycle and uneven implementation at a state level, the reform’s sequence left little time for full implementation of its more pedagogical aspects, such as the new education model, and ultimately faced dramatic reprisal from the new presidential administration.
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Seligman, Eva. "Working with a couple." In The Half-Alive Ones, 93–99. Routledge, 2018. http://dx.doi.org/10.4324/9780429481963-6.
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Jones, Nikki. "Buffers and Bridges." In The Chosen Ones, 116–41. University of California Press, 2018. http://dx.doi.org/10.1525/california/9780520288348.003.0005.
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Chapter 4 highlights the strategies Eric and the men of Brothers Changing the Hood used in their efforts to help young men in their neighborhood. The men met the gendered expectations of being protectors and providers by serving as buffers from the various threats that young men in the neighborhood encounter, from violence to the intervention of law enforcement, and as bridges between other organizations and the young men these organizations often have difficulty reaching. The chapter also illuminates the ways that men extend understandings of Black masculinity by investing in emotional and relational aspects of caregiving. Their efforts reveal that strength need not always be coupled with dominance – a revelation that holds the seeds of a radically redefined understanding of Black gender ideologies. The chapter also provides evidence of the limits of these efforts, especially the degree to which surveillance and state-sanctioned violence can impede men’s efforts to redeem themselves as Black fathers.
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Apaolaza, Xabier, Alain Sommier, Marc Valat, Pascal Ginisty, and Wahbi Jomaa. "Instrumentation d’une centrifugeuse pilote couplée à un système d’apport thermique par micro-ondes." In Instrumentation et Interdisciplinarité, 257–62. EDP Sciences, 2020. http://dx.doi.org/10.1051/978-2-7598-1206-6-032.
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Apaolaza, Xabier, Alain Sommier, Marc Valat, Pascal Ginisty, and Wahbi Jomaa. "Instrumentation d’une centrifugeuse pilote couplée à un système d’apport thermique par micro-ondes." In Instrumentation et Interdisciplinarité, 257–62. EDP Sciences, 2020. http://dx.doi.org/10.1051/978-2-7598-1206-6.c032.
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Jayich, Ania Bleszynski. "Spin-coupled Mechanical Systems." In Quantum Optomechanics and Nanomechanics, 277–306. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780198828143.003.0007.
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A hybrid system composed of a spin coupled to a mechanical degree of freedom is interesting for several reasons: enhancing the functionality of the spin and of the mechanical system, and in the quantum and semiclassical regimes. This chapter gives an overview of some of the goals of spin-coupled mechanical systems and then introduces the nitrogen-vacancy (NV) centre, its energy level structure, and its sensitivity to external fields, with a discussion on what makes NVs exciting for hybrid quantum technologies and in particular integration with mechanical oscillators. Simple group theory arguments will be introduced to explain the NV’s energy level structure and its coupling to strain. It concludes with a discussion of different NV centre-mechanical coupling mechanisms, specifically magnetic- and strain-based ones, with realistic values for the coupling strength and protocols for coupling, as well as technical challenges to achieving a functional NV-mechanical coupled system, particularly in the quantum regime.
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Holloway, Sally. "Love Letters." In The Game of Love in Georgian England, 45–68. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780198823070.003.0003.
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This chapter considers how letters worked to move a relationship forward and facilitate greater emotional intimacy between writers. The chapter evaluates the role of the love letter on the path to matrimony using the correspondences of eight couples of varied social rank. Letter-writing is presented as a distinct stage of courtship, during which couples negotiated, tested, and cemented a marital bond. Men and women adopted particular gendered strategies, with women demonstrating their virtue, modesty, and self-doubt to suitors, who in return emphasized their sincerity, and—with increasing frequency over the century—rhapsodized about their depth of feeling. Engagement to marry was not a single moment but a lengthy process, becoming more assured as greater numbers of letters were exchanged. The chapter demonstrates the emotional value of missives as ‘thoughts’ or ‘favours’ sent by loved ones, which were treated as treasured possessions and praised as sources of pleasure that could even transcend death itself.
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Guerin, Dava, and Terry Bivens. "The Art of Training Wild Animals." In The Eagle on My Arm, 76–81. University Press of Kentucky, 2020. http://dx.doi.org/10.5810/kentucky/9780813180021.003.0012.
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In this chapter Patrick and Carol are together as a couple and work together at the theme park. Patrick shows readers how he is trains wild animals for movies and other shows. There are some funny scenes as well as a few scary ones where Patrick’s life is in danger. He also goes into detail on a variety of animal species.
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Robertson, Mary. "“It’s Going to Be Okay”." In Growing Up Queer, 117–38. NYU Press, 2018. http://dx.doi.org/10.18574/nyu/9781479879601.003.0006.
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Acknowledging that the youth of Spectrum tend to disclose their sexual and gender identities to parents at a relatively young age, this chapter explores the role of family in the formation of these youths’ sexualities and genders. It was often the case with Spectrum youth that, rather than rejection, they encountered loving support about their sexuality from their parents. The youth of Spectrum are of a generation of kids who are the first to grow up in a society in which same-sex couples and genderqueer parents rearing children have become significantly socially acceptable. The chapter argues that young people are sharing their queer sexual and gender identities with their parents at a younger age because of gender non-conformity that leads parents to make assumptions about their child’s sexuality because they are more frequently exposed to LGBTQ family members and loved ones and because these particular parents do not conform to the white, middle-class, heteropatriarchal regime of the Standard North American Family. Queer family formation has broad implications not just for same-sex couples but for the way U.S. society understands and recognizes family in general.
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Sufrin, Carolyn. "At Home in Jail." In Jailcare. University of California Press, 2017. http://dx.doi.org/10.1525/california/9780520288669.003.0009.
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This chapter demonstrates how a tragic state of affairs, one in which economic insecurity and the frayed safety net, coupled with the expansion of carceral institutions, have made jail a safe and even desirable place for women like the ones interviewed so far in this book. In contrast to their precarious and sometimes violent lives on the streets, jail provided safety and stability, and thus became a version of home. But this version of home is shaded with the knowledge that safety is predicated on criminality: punishment is the institutional form that safety and security takes, hence the relationship between the violence of the streets and the care of carcerality.
Conference papers on the topic "Ondes couplées"
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Kim, Dong-Ok, Jong-In Kim, and In-Won Lee. "Influences of Coupler Consisting of Rotational Stiffness and Mass on Wave Propagation and Mode Localization in Simply Supported Multispan Beams." In ASME 1999 Design Engineering Technical Conferences. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/detc99/vib-8076.
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Abstract The influences of coupler on wave propagation and mode localization in simply supported multispan beams with couplers consisting of lumped rotational stiffness and mass on supports are studied. A transfer matrix equation governing the vibrational wave propagation in the simply supported multispan beams with couplers is newly derived and simplified. The eigenvalue of the simplified transfer matrix show that the larger stiffness or the larger mass of coupler makes the internal coupling between spans weaker and so it makes the system more sensitive to mode localization. As the wave frequency or the eigenvalues of the system increases, the mass effect is increased while the stiffness effect is decreased. In a case considering the large stiffness and mass at the same time, there is a region with relatively wider passbands and narrower stopbands having small attenuation rates and the normal modes in it become delocalized ones. As an example structure, simply supported two span beam with a coupler at the mid-span is considered.
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Wang, Hui-Ping, Mark E. Botkin, Cheng-Tang Wu, and Sijun He. "Coupled Finite Element/Meshfree Simulation of Manufacturing Problems." In ASME 2003 Pressure Vessels and Piping Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/pvp2003-1903.
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This paper studies the performance of a newly developed coupled finite element/meshfree tool in manufacturing problem simulation. Two manufacturing problems, a battery tray forming and an axisymmetric forging, are used for demonstration. In both problems, the coupled finite element/meshfree analysis is compared with the traditional finite element analysis. The numerical studies show that the coupled finite element/meshfree solution is as accurate as the finite element solution for the problems without mesh distortion difficulties. For the ones involving excessive deformation, the coupled method provides more reliable solutions than the traditional finite element method, but higher CPU is required.
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Tan, Wei, Hao Wu, Zhihai Yang, Zhao Li, Liyan Liu, and Guorui Zhu. "Coupled Vibration Research for Cylinders in Heat Exchanger Based on Noncontact-Measurement and Acoustic Fluid-Solid Interaction Simulations." In ASME 2017 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/pvp2017-65585.
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A cylinder array vibrating in a fluid exhibits multiple coupled frequencies and coupled mode shapes. For a square array of four cylinders with a pitch-to-diameter ratio of 1.25, one cylinder was excited. In order to obtain the coupled modes of the whole array without the influence of exciters, a new method named noncontact-measurement image processing system was used in this paper. This system can guarantee the consistency of the frequencies quantificationally. Due to noncontact-measurement, the flow field around cylinder arrays will not be disturbed and can be measured precisely. Experimental results show that if we want to obtain all the coupled mode shapes, the consistency of cylinder frequencies (within 2%) must be insured and the vibrated cylinder should be chosen with larger amplitude in the coupled mode shapes. Distinct coupled frequencies correspond to symmetric mode shapes, while repeated coupled frequencies correspond to asymmetric ones. Besides, the acoustic fluid-solid interaction numerical method was used to calculate the vibration process of multi objects in still water. The numerical simulation results were in good agreement with experimental ones. It is found that for the same number of cylinders, the bandwidth of coupled frequencies increases with the decrease of pitch-to-diameter ratio, and that for the same pitch-to-diameter ratio, the bandwidth of coupled frequencies increases with the increase of the number of cylinders. Detuning of the cylinder frequencies leads to changes of coupled frequencies and coupled mode shapes.
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Merino, He´ctor E. M., Jose´ R. M. de Sousa, Carlos Magluta, and Ney Roitman. "On the Coupled Extensional–Torsional Response of Flexible Pipes." In ASME 2009 28th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2009. http://dx.doi.org/10.1115/omae2009-79468.
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In this paper, the coupled extensional-torsional behavior of a 4″ flexible pipe is studied. The pipe was subjected to pure tension and two different boundary conditions were considered: ends free and prevented from axially rotating. The response of the pipe is predicted with a three-dimensional nonlinear finite element (FE) model. Some aspects of the obtained results are discussed, such as: the effect of restraining the axial rotation at the extreme sections of the model; the effect of friction or adhesion between the layers of the pipe on the induced axial rotation (or torque) and elongation; and the reduction to simple plane behavior usually assumed by analytical models. The numerical results are compared to the ones measured in experimental tests performed at COPPE/UFRJ. Reasonable agreement is observed between all results pointing out that the analyzed pipe is torque balanced and that friction mainly affects the axial twist or torque led by the applied tension. Moreover, the cross-sections of the pipe remain straight with the imposed load, but different axial rotations are found in each layer.
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Yucel, Adil, Alaeddin Arpaci, and Ekrem Tufekci. "Coupled Axial-Flexural-Torsional Vibration of Internally Damped Timoshenko Frames." In ASME 2010 10th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2010. http://dx.doi.org/10.1115/esda2010-24861.
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In this study, free in-plane and out-of-plane bending vibrations of frame structures have been analyzed together with torsional vibration. Axial extension, rotational inertia and shear effects have also been considered. The frame structure has been constructed as having two beams with doubly symmetric cross-sections and connected at any angle to each other. These types of frames frequently appear on ships as bridge wings which are probably the most problematic members experiencing severe vibration. Internal damping has been incorporated into the analyses by using a complex modulus of elasticity. Natural frequencies have been obtained analytically by solving simultaneous linear equations of complex coefficients. A finite element analysis has also been conducted to verify the analytical results. Furthermore, an experimental modal analysis has been carried out and the results have been compared with theoretical ones in tables for various connection angles and damping factors. The agreement among results has been found to be good.
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Koide, Yuichi, Yoshihiro Goto, Yuki Sato, Shohei Onitsuka, and Hirokuni Ishigaki. "Modeling of Fuel Assemblies in a Boiling Water Reactor for Seismic Analysis." In ASME 2014 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/pvp2014-28672.
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The purpose of this study is to develop a seismic analysis model of a group of fuel assemblies in a boiling water reactor and to confirm the validity of the developed model. Each fuel assembly was modeled as a beam on the basis of the finite element method. The mass matrix of the model includes an added mass matrix, which represents the coupled inertia effect caused by the coolant water, in order to simulate the coupled vibration of fuel assemblies. The added mass matrix was obtained by calculating the coefficient matrix of the acceleration vector and fluid force vector under the condition that each fuel assembly moves at unit acceleration. The validity of the model was confirmed by comparing the calculated results with experimental ones. The compared specimens for the experiments were full-scale mock-ups. The vibration characteristics of fuel assemblies in each case of 4 bodies and 368 bodies were compared. As a result of the comparison, the calculations of the frequency response were in agreement with the experimental results. Particularly, the calculation results on the resonance frequency were in good agreement, with an error of less than 2 percent, with the experimental ones. Furthermore, the calculated vibration characteristics of 368 fuel assemblies in the case of an earthquake, such as the excited vibration mode and phase characteristics, were in agreement with the experimental ones. We concluded that the developed model of fuel assemblies was applicable to seismic analysis of a boiling water core.
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Narahari Achar, B. N., and John W. Hanneken. "Response Dynamics in the Continuum Limit of the Lattice Dynamical Theory of Viscoelasticity (Fractional Calculus Approach)." In ASME 2009 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/detc2009-86218.
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A fractional diffusion-wave equation is derived in the continuum limit of the lattice dynamical equations of motion of a chain of coupled fractional oscillators obtained from the integral equations of motion of a linear chain of simple harmonic oscillators by generalization of the ordinary integrals into ones involving fractional integrals. The set of integral equations of motion pertaining to the chain of coupled fractional oscillators in the continuum limit is solved by using Laplace transforms. The response of the system to impulse and sinusoidal forcing is studied. Numerical applications are discussed with particular reference to energy flow and dissipation.
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Kobayashi, Nobuyuki, Noriaki Seo, Masahiro Watanabe, and Friedrich Pfeiffer. "Rocking and Slip Coupled Seismic Response of Large and Flexible Cylindrical Storage Tanks." In ASME 2007 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/detc2007-35109.
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The slip and rocking coupled response of the unanchored flexible cylindrical storage tanks due to the seismic excitation is investigated. A five-degrees of freedom mechanical model is developed in order to examine the slip and rocking coupled seismic response accompanied with the uplifting of the base plate. The model takes into account the flexibility of the tank shell and bottom plate, the hydrodynamic pressure effect of the contained liquid to the tank shell and bottom plate as well as the slip and rocking motion introducing the unilateral contact. The validity of the presented mechanical model is demonstrated by the shaking table experiments with a scale model tank. As the numerical simulations results, it is clarified that slip and rocking coupled motion gives significant effect on the seismic response of the tank, and the taller tank is easier to slip than the broader ones is.
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Malaeke, Hasan, Hamid Moeenfard, and Amir H. Ghasemi. "Nonlinear Coupled Transverse and Axial Vibration of Variable Cross-Section Beam Flexures Interconnecting Rigid Body." In ASME 2016 Dynamic Systems and Control Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/dscc2016-9881.
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The objective of this paper is to analytically study the nonlinear behavior of variable cross-section beam flexures interconnecting an eccentric rigid body. Hamilton’s principle is utilized to obtain the partial differential equations governing the nonlinear vibration of the system as well as the corresponding boundary conditions. Using a single mode approximation, the governing equations are reduced to a set of two nonlinear ordinary differential equations in terms of end displacement components of the beam which are coupled due to the presence of the transverse eccentricity. The method of multiple scales are employed to obtain parametric closed-form solutions. The obtained analytical results are compared with the numerical ones and excellent agreement is observed. These analytical expressions provide design insights for modeling and optimization of more complex flexure mechanisms for improved dynamic performances.
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Ramakrishnan, Subramanian, and Manish Kumar. "Nonlinear Energy Harvesting Using Coupled Micro-Scale Oscillator Arrays." In ASME 2011 5th International Conference on Energy Sustainability. ASMEDC, 2011. http://dx.doi.org/10.1115/es2011-54802.
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Vibration energy harvesting paradigms that seek to exploit the unique characteristics of nonlinear and stochastic systems are currently emerging as an important aspect of frontier research in energy sustainability. In particular, the ubiquitous nature of ambient mechanical vibrations and recent results obtained in the dynamics of micro and nano scale oscillatory systems together suggest the potential efficacy of vibration energy harvesting for the powering of small scale electronic mobile devices. In this context, the inherent advantages of using nonlinear systems over linear ones for energy harvesting are currently well established. In addition, the inherently random nature of ambient vibrations as well as the emergence of phenomena such as stochastic resonance indicates the imperativeness of a stochastic approach. Computational and experimental studies of energy harvesting involving individual nonlinear oscillators that take into account some of the above mentioned features have recently been reported in the literature. In this article, the authors present a new approach to the problem by introducing an analytical framework based on the Fokker-Planck formalism. In particular, the framework is applied to a nonlinearly coupled array of micro-scale oscillators in order to investigate the potential advantages of stochastic effects in coupled arrays for energy harvesting. The influence of varying coupling strengths as well as noise intensity on harvestable energy is studied for the case of a nonlinearly coupled micro-cantilever array. It is noted that the micro-scale arrays of the type under consideration have already been employed in experimental investigations of energy localization effects and hence are currently available for technological applications. In conclusion, the analytical framework introduced and the results obtained in this article are expected to contribute to a fundamental understanding of how the synergistic effects of nonlinear and stochastic phenomena could contribute to the development of novel methods for efficient vibration energy harvesting.