Relevant bibliographies by topics / Tenseur de conformation

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

Academic literature on the topic 'Tenseur de conformation'

Author: Grafiati
Published: 4 June 2021
Last updated: 9 February 2022

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Journal articles on the topic "Tenseur de conformation"

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Brugna, Myriam, Delphine Albouy, and Wolfgang Nitschke. "Diversity of Cytochrome bc Complexes: Example of the Rieske Protein in Green Sulfur Bacteria." Journal of Bacteriology 180, no. 14 (1998): 3719–23. http://dx.doi.org/10.1128/jb.180.14.3719-3723.1998.

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ABSTRACT The Rieske 2Fe2S cluster of Chlorobium limicola formathiosulfatophilum strain tassajara was studied by electron paramagnetic resonance spectroscopy. Two distinct orientations of its g tensor were observed in oriented samples corresponding to differing conformations of the protein. Only one of the two conformations persisted after treatment with 2,5-dibromo-3-methyl-6-isopropyl-p-benzoquinone. A redox midpoint potential (Em ) of +160 mV in the pH range of 6 to 7.7 and a decreasing Em (−60 to −80 mV/pH unit) above pH 7.7 were found. The implications of the existence of differing conform
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Hameduddin, Ismail, Charles Meneveau, Tamer A. Zaki, and Dennice F. Gayme. "Geometric decomposition of the conformation tensor in viscoelastic turbulence." Journal of Fluid Mechanics 842 (March 12, 2018): 395–427. http://dx.doi.org/10.1017/jfm.2018.118.

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This work introduces a mathematical approach to analysing the polymer dynamics in turbulent viscoelastic flows that uses a new geometric decomposition of the conformation tensor, along with associated scalar measures of the polymer fluctuations. The approach circumvents an inherent difficulty in traditional Reynolds decompositions of the conformation tensor: the fluctuating tensor fields are not positive definite and so do not retain the physical meaning of the tensor. The geometric decomposition of the conformation tensor yields both mean and fluctuating tensor fields that are positive defini
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Grmela, M., and P. J. Carreau. "Conformation tensor rheological models." Journal of Non-Newtonian Fluid Mechanics 23 (January 1987): 271–94. http://dx.doi.org/10.1016/0377-0257(87)80022-8.

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Marino, Valerio, Matteo Riva, Davide Zamboni, Karl-Wilhelm Koch, and Daniele Dell'Orco. "Bringing the Ca 2+ sensitivity of myristoylated recoverin into the physiological range." Open Biology 11, no. 1 (2021): 200346. http://dx.doi.org/10.1098/rsob.200346.

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The prototypical Ca 2+ -sensor protein recoverin (Rec) is thought to regulate the activity of rhodopsin kinase (GRK1) in photoreceptors by switching from a relaxed (R) disc membrane-bound conformation in the dark to a more compact, cytosol-diffusing tense (T) conformation upon cell illumination. However, the apparent affinity for Ca 2+ of its physiologically relevant form (myristoylated recoverin) is almost two orders of magnitude too low to support this mechanism in vivo . In this work, we compared the individual and synergistic roles of the myristic moiety, the GRK1 target and the disc membr
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Mwasame, Paul M, Norman J Wagner, and Antony N Beris. "Micro-Inertia Effects in Material Flow." Journal of Non-Equilibrium Thermodynamics 44, no. 3 (2019): 235–46. http://dx.doi.org/10.1515/jnet-2018-0072.

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Abstract The mechanics of understanding a new application of the bracket theory of Non-Equilibrium Thermodynamics that allows for the incorporation of microstructural inertia effects within conformation tensor-based constitutive models of macroscopic material behavior is presented. Introducing inertia effects generally requires the replacement of a first order in time evolution equation for the conformation tensor by a second order one. Through the analysis of a simple damped oscillator we bring forward here the close connection to the structural dissipation brackets present in the two cases,
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Fothergill-Gilmore, L. A., D. J. Rigden, P. A. M. Michels, and S. E. V. Phillips. "Leishmania pyruvate kinase: the crystal structure reveals the structural basis of its unique regulatory properties." Biochemical Society Transactions 28, no. 2 (2000): 186–90. http://dx.doi.org/10.1042/bst0280186.

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Glycolysis occupies a central role in cellular metabolism, and is of particular importance for the catabolic production of ATP in protozoan parasites such as Leishmania and Trypanosoma. In these organisms pyruvate kinase plays a key regulatory role, and is unique in responding to fructose 2,6-bisphosphate as allosteric activator. The determination of the crystal structure of the first eukaryotic pyruvate kinase in the T-state (the inactive or ‘tense’ conformation of allosteric enzymes) is described. A comparison of the effector sites of the Leishmania and yeast enzymes reveals the structural b
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Hameduddin, Ismail, and Tamer A. Zaki. "The mean conformation tensor in viscoelastic turbulence." Journal of Fluid Mechanics 865 (February 19, 2019): 363–80. http://dx.doi.org/10.1017/jfm.2019.46.

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This work demonstrates that the popular arithmetic mean conformation tensor frequently used in the analysis of turbulent viscoelastic flows is not a good representative of the ensemble. Alternative means based on recent developments in the literature are proposed, namely, the geometric and log-Euclidean means. These means are mathematically consistent with the Riemannian structure of the manifold of positive-definite tensors, on which the conformation tensor lives, and have useful properties that make them attractive alternatives to the arithmetic mean. Using a turbulent FENE-P channel flow da
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Safo, Martin K., Tzu-Ping Ko, Osheiza Abdulmalik та ін. "Structure of fully liganded Hb ζ2β2strapped in a tense conformation". Acta Crystallographica Section D Biological Crystallography 69, № 10 (2013): 2061–71. http://dx.doi.org/10.1107/s0907444913019197.

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A variant Hb ζ2β2sthat is formed from sickle hemoglobin (Hb S; α2β2s) by exchanging adult α-globin with embryonic ζ-globin subunits shows promise as a therapeutic agent for sickle-cell disease (SCD). Hb ζ2β2sinhibits the polymerization of deoxygenated Hb Sin vitroand reverses characteristic features of SCDin vivoin mouse models of the disorder. When compared with either Hb S or with normal human adult Hb A (α2β2), Hb ζ2β2sexhibits atypical properties that include a high oxygen affinity, reduced cooperativity, a weak Bohr effect and blunted 2,3-diphosphoglycerate allostery. Here, the 1.95 Å res
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BARRETT, JOHN W., and SÉBASTIEN BOYAVAL. "EXISTENCE AND APPROXIMATION OF A (REGULARIZED) OLDROYD-B MODEL." Mathematical Models and Methods in Applied Sciences 21, no. 09 (2011): 1783–837. http://dx.doi.org/10.1142/s0218202511005581.

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We consider the finite element approximation of the Oldroyd-B system of equations, which models a dilute polymeric fluid, in a bounded domain [Formula: see text], d = 2 or 3, subject to no flow boundary conditions. Our schemes are based on approximating the pressure and the symmetric conformation tensor by either (a) piecewise constants or (b) continuous piecewise linears. In case (a) the velocity field is approximated by continuous piecewise quadratics or a reduced version, where the tangential component on each simplicial edge (d = 2) or face (d = 3) is linear. In case (b) the velocity field
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Graham, Michael D. "Polymer turbulence with Reynolds and Riemann." Journal of Fluid Mechanics 848 (June 1, 2018): 1–4. http://dx.doi.org/10.1017/jfm.2018.353.

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Models of flowing complex fluids such as polymer solutions often use a conformation tensor that reflects the state of the fluid microstructure. In polymer solutions, this quantity measures the orientation and stretching of the molecules, and reflects the fact that the squared length of a polymer molecule must be positive. By exploiting results from differential geometry and continuum mechanics, Hameduddin et al. (J. Fluid Mech., vol. 842, 2018, pp. 395–427) introduce a new approach for analysing the conformation tensor that respects this positivity constraint. With this approach, they present
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Dissertations / Theses on the topic "Tenseur de conformation"

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Kane, Abdoulaye Sabou. "Simulation des écoulements de fluides viscoélastiques par une formulation en logarithmique du tenseur de conformation." Thesis, Université Laval, 2009. http://www.theses.ulaval.ca/2009/26297/26297.pdf.

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L'objectif des travaux présentés dans cette thèse est d'explorer de nouvelles méthodes numériques efficaces et robustes pour la résolution par la méthode des éléments finis des problèmes d'écoulements des fluides viscoélastiques pour des nombres de Weissenberg élevés. La motivation de cette étude provient en grande partie au fait que les fluides viscoélastiques sont à la base de nombreuses applications industrielles, notamment dans l'industrie des polymères, l'industrie des pâtes de papiers, l'industrie alimentaire, etc... Ces écoulements sont régis par un système d'équations aux dérivées par
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Martins, Ramon Silva. "Numerical simulation of turbulent viscoelastic fluid flows : flow classification and preservation of positive-definiteness of the conformation tensor." Thesis, Lille 1, 2016. http://www.theses.fr/2016LIL10127/document.

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Le but de ce travail est de fournir une amélioration de la connaissance sur le phénomène de la réduction de la traînée induite par polymère en considérant certains aspects de sa simulation numérique et les changements qui se produisent dans la cinématique de l’écoulement. Dans un premier temps, les transformations du type racine carrée et kernel racine-k pour le tenseur de conformation du modèle FENE-P ont été implémentées afin d’assurer la positivité du tenseur de conformation. Cependant, ces approches divergent en raison du caractère non-borné du tenseur de conformation. Cette contrainte n’a
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"Simulation des écoulements de fluides viscoélastiques par une formulation en logarithmique du tenseur de conformation." Thesis, Université Laval, 2009. http://www.theses.ulaval.ca/2009/26297/26297.pdf.

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Book chapters on the topic "Tenseur de conformation"

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Na, Hyuntae, Tu-Liang Lin, and Guang Song. "Generalized Spring Tensor Models for Protein Fluctuation Dynamics and Conformation Changes." In Advances in Experimental Medicine and Biology. Springer International Publishing, 2013. http://dx.doi.org/10.1007/978-3-319-02970-2_5.

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Beris, Antony N., and Brian J. Edwards. "The Dynamical Theory of Liquid Crystals." In Thermodynamics of Flowing Systems: with Internal Microstructure. Oxford University Press, 1994. http://dx.doi.org/10.1093/oso/9780195076943.003.0016.

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Liquid crystals (LCs) present a state of matter with properties—as the name suggests—intermediate between those of liquids and crystalline solids. Liquid-crystalline materials, as all liquids, cannot support shear stresses at static equilibrium. Their molecules are characterized by an anisotropy in the shape and/or intermolecular forces. Thus, there is the potential for the formation of a separate phase(s), called a “mesophase(s),” where a partial order arises in the molecular orientation and/or location, which extends over macroscopic distances. This partial long-range molecular order, reminiscent of (but not equivalent to) the perfect order of solid crystals, in addition to the material fluidity, is primarily responsible for the many properties which are inherent characteristics of liquid-crystalline phases, such as a rapid response to electric and magnetic fields, anisotropic optical and rheological properties, etc.—see, for examples, the reviews by Stephen and Straley [1974] and Jackson and Shaw [1991], the monographs by de Gennes [1974], Chandrasekhar [1977], and Vertogen and de Jeu [1988], and the edited volumes by Ciferri et al. [1982] and Ciferri [1991]. The variety of the liquid-crystalline macroscopic properties is such that trying to derive a theory capable of describing the principal liquid-crystalline dynamic characteristics can be a very frustrating task if one does not approach the issue in a systematic fashion. Characteristically, the main two theories that have been advanced over the last thirty years for the description of the liquid-crystalline flow behavior—the Leslie/ Ericksen (LE) theory and the Doi theory—are essentially models developed from a set theoretical frame work—continuum mechanics and molecular theory, respectively. Nevertheless, each one of these theories has a limited domain of application. The description of the dynamic liquid-crystalline behavior through the bracket formalism, as seen in this chapter, leads naturally to a single conformation tensor theory with an extended domain of validity. This conformation theory consistently generalizes both previous theories, which can be recovered from it as particular cases. This offers additional evidence that the wealth of inherent information in LCs can only be appropriately handled when pursued in a systematic, fundamental manner.
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Erman, Burak, and James E. Mark. "Segmental Orientation." In Structures and Properties of Rubberlike Networks. Oxford University Press, 1997. http://dx.doi.org/10.1093/oso/9780195082371.003.0013.

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Segmental or molecular orientation refers to the anisotropic distribution of chain-segment orientations in space, due to the orienting effect of some external agent. In the case of uniaxially stretched rubbery networks, which will be the focus of this chapter, segmental orientation results from the distortion of the configurations of network chains when the network is macroscopically deformed. In the undistorted state, the orientations of chain segments are random, and hence the network is isotropic because the chain may undertake all possible configurations, without any bias. In the other hypothetically extreme case of infinite degree of stretching of the network, segments align exclusively along the direction of stretch. The mathematical description of segmental orientation at all levels of macroscopic deformation is the focus of this chapter. Segmental orientation in rubbery networks differs distinctly from that in crystalline or glassy polymers. Whereas the chains in glassy or crystalline solids are fully or partly frozen, those in an elastomeric network have the full freedom to go from one configuration to another, subject to the constraints imposed by the network connectivity. The orientation at the segmental level in glassy or crystalline networks is mostly induced by intermolecular coupling between closely packed neighboring molecules, while in the rubbery network intramolecular conformational distributions predominantly determine the degree of segmental orientation. The first section of this chapter describes the state of molecular deformation. In section 11.2, the simple theory of segmental orientation is outlined, followed by the more detailed treatment of Nagai and Flory. The chapter concludes with a discussion of infrared spectroscopy and the birefringence technique for measuring segmental orientation. For uniaxial deformation, the deformation tensor λ takes the form λ = diag(λ, λ-1/2, λ-1/2), where diag represents the diagonal of a square matrix, and λ is the ratio of the stretched length of the rubbery sample to its undeformed reference length. The first element along the diagonal of the matrix represents the extension ratio along the direction of stretch, which may be conveniently identified as the X axis of a laboratory-fixed frame XYZ. The other two elements refer to the deformation along two lateral directions, Y and Z.
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Conference papers on the topic "Tenseur de conformation"

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Tamano, Shinji, Michael D. Graham, and Yohei Morinishi. "Streamwise Variations in Turbulence Statistics in Drag-Reducing Turbulent Boundary Layer of Viscoelastic Fluids." In ASME-JSME-KSME 2011 Joint Fluids Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ajk2011-25001.

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Direct numerical simulation (DNS) of a zero-pressure gradient drag-reducing turbulent boundary layer of viscoelastic fluids was performed at the different Weissenberg number We = 25, 50, 75, and 100 using the FENE-P model. The increase in We, i.e. the relaxation time leads to the larger maximum of trace of conformation tensor in upstream region, and to the larger maximum of drag reduction ratio DR in downstream region, in which the trace of conformation tensor decreases gradually in the streamwise direction, while the DR increases. The trace of conformation tensor is anticorrelated with DR, Wh
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Leighton, Richard, David T. Walker, Todd Stephens, and Gordon Garwood. "Reynolds Stress Modeling for Drag Reducing Viscoelastic Flows." In ASME/JSME 2003 4th Joint Fluids Summer Engineering Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/fedsm2003-45655.

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A Reynolds-stress transport equation model for turbulent drag-reducing viscoelastic flows, such as that which occurs for dilute polymer solutions, is presented. The approach relies on an extended set of Reynolds-Averaged Navier-Stokes equations which incorporate additional polymer stresses. The polymer stresses are specified in terms of the mean polymer conformation tensor using the FENE-P dumbbell model. The mean conformation tensor equation is solved in a coupled manner along with the Navier-Stokes equations. The presence of the polymer stresses in the equations of motion results in addition
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Lin, Tu-Liang, and Guang Song. "Generalized spring tensor models for protein fluctuation dynamics and conformation changes." In 2009 IEEE International Conference on Bioinformatics and Biomedicine Workshop, BIBMW. IEEE, 2009. http://dx.doi.org/10.1109/bibmw.2009.5332117.

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Jafari, Azadeh, Michel O. Deville, and Nicolas Fiétier. "Spectral Elements Analysis for Viscoelastic Fluids at High Weissenberg Number Using Logarithmic conformation Tensor Model." In NUMERICAL ANALYSIS AND APPLIED MATHEMATICS: International Conference on Numerical Analysis and Applied Mathematics 2008. American Institute of Physics, 2008. http://dx.doi.org/10.1063/1.2990912.

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Maftouni, N., M. Amininasab, and F. Kowsari. "Pressure Field in Liquid Phase Nanomembrane System." In ASME 2010 10th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2010. http://dx.doi.org/10.1115/esda2010-25234.

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Nanomembrane is a very important part of living systems. Alive cells have lipid bilayer nanomembrane in liquid phase. The lateral pressure profile, or stress profile, across a cell nanomembrane is the result of the inhomogeneous nature of the interactions within a nanomembrane. It has been shown that the work exerted by the pressure profile when a protein conformational change takes place is significant, of the order of 10kBT, and that the lateral pressure profile averaged over the whole nanomembrane is modified by the inclusion of a protein. Indeed, understanding the full coupling for stress
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Boutaous, M’hamed, Matthieu Zinet, Rabie El Otmani, and Patrick Bourgin. "Simulation of Polymer Crystallization: Role of the Visco-Elasticity." In ASME 2010 3rd Joint US-European Fluids Engineering Summer Meeting collocated with 8th International Conference on Nanochannels, Microchannels, and Minichannels. ASMEDC, 2010. http://dx.doi.org/10.1115/fedsm-icnmm2010-30209.

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In polymer processing, it is established that the flow causes the polymer chains to stretch and store the energy, by changing their quiescent state free energy. Koscher et al. [1] presented in 2002 an experimental work concerning the flow induced crystallization. They made the assumption that the polymer melt elasticity, quantified by the first normal stress difference, is the driving force of flow-induced extra nucleation. In their work, a constant shear stress is considered, and the first normal stress difference agrees with the use of the trace of the stress tensor. The stored energy due to
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Resende, P. R., K. Kim, F. T. Pinho, et al. "A Priori DNS Development of a Closure for The Nonlinear Term of The Evolution Equation of The Conformation Tensor for FENE-P Fluids." In THE XV INTERNATIONAL CONGRESS ON RHEOLOGY: The Society of Rheology 80th Annual Meeting. AIP, 2008. http://dx.doi.org/10.1063/1.2964640.

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Hagani, Fouad, M'hamed Boutaous, Ronnie Knikker, Shihe Xin, and Dennis Siginer. "Numerical Modeling of Non-Affine Viscoelastic Fluid Flow Including Viscous Dissipation Through a Square Cross-Section Duct: Heat Transfer Enhancement due to the Inertia and the Elastic Effects." In ASME 2020 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/imece2020-23558.

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Abstract Non-isothermal laminar flow of a viscoelastic fluid including viscous dissipation through a square cross–section duct is analyzed. Viscoelastic stresses are described by Giesekus modele orthe Phan-Thien–Tanner model and the solvent shear stress is given by the linear Newtonian constitutive relationship. The flow through the tube is governed by the conservation equations of energy, mass, momentum associated with to one non–affine rheological model mentioned above. The mixed type of the governing system of equations (elliptic–parabolic–hyperbolic) requires coupling between discretisatio
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