Relevant bibliographies by topics / Domain wall theory

Academic literature on the topic 'Domain wall theory'

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Published: 14 March 2023

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Journal articles on the topic "Domain wall theory"

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Smith, Ralph C., and Craig L. Hom. "Domain Wall Theory for Ferroelectric Hysteresis." Journal of Intelligent Material Systems and Structures 10, no. 3 (March 1999): 195–213. http://dx.doi.org/10.1177/1045389x9901000302.

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Allenspach, Rolf, and Pierre-Olivier Jubert. "Magnetic Domain Walls in Nanowires." MRS Bulletin 31, no. 5 (May 2006): 395–99. http://dx.doi.org/10.1557/mrs2006.100.

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AbstractFor many decades, it was assumed that the characteristics of magnetic domain walls were determined by material properties and the walls were moved by magnetic fields.In the past few years, it has been shown that domain walls behave differently on the nanometer scale.Domain walls in small elements exhibit complex spin arrangements that strongly deviate from the wall types commonly encountered in magnetic thin-film systems, and they can be modified by changing the geometry of the element.Domain walls in nanowires can also be moved by injecting electrical current pulses.Whereas wall propagation is qualitatively explained by a spin transfer from the conduction electrons to the spins of the domain wall, important aspects of the observations cannot be explained by present models.Examples include the observation of a drastic transformation of the wall structure upon current injection and domain wall velocities that tend to be orders of magnitude smaller than anticipated from theory.
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NAGASHIMA, TAKAYUKI. "DYNAMICS OF DOMAIN WALL NETWORKS." International Journal of Modern Physics A 23, no. 14n15 (June 20, 2008): 2269–71. http://dx.doi.org/10.1142/s0217751x08041049.

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Networks or webs of domain walls are admitted in Abelian or non-Abelian gauge theory coupled to fundamental Higgs fields with complex masses. We examine the dynamics of the domain wall loops by using the moduli space approximation. This talk is based on works in collaboration with M.Eto, T.Fujimori, M.Nitta, K.Ohashi, and N.Sakai1,2.
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CVETIČ, M. "DOMAIN WALL WORLD(S)." International Journal of Modern Physics A 16, no. 05 (February 20, 2001): 891–99. http://dx.doi.org/10.1142/s0217751x01003974.

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Gravitational properties of domain walls in fundamental theory and their implications for the trapping of gravity are reviewed. In particular, the difficulties to embed gravity trapping configurations within gauged supergravity is reviewed and the status of the domain walls obtained via the breathing mode of sphere reduced Type IIB supergravity is presented.
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Zhang, Ruifeng, and Xiaojing Wang. "On generalized geometric domain-wall models." Proceedings of the Royal Society of Edinburgh: Section A Mathematics 141, no. 4 (July 15, 2011): 881–95. http://dx.doi.org/10.1017/s0308210510001198.

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We study domain walls that are topological solitons in one dimension. We present an existence theory for the solutions of the basic governing equations of some extended geometrically constrained domain-wall models. When the cross-section and potential density are both even, we establish the existence of an odd domain-wall solution realizing the phase-transition process between two adjacent domain phases. When the cross-section satisfies a certain integrability condition, we prove that a domain-wall solution always exists that links two arbitrarily designated domain phases.
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Tatara, G., H. Kohno, and J. Shibata. "Theory of current-driven domain wall dynamics." Journal of Physics D: Applied Physics 40, no. 5 (February 16, 2007): 1257–60. http://dx.doi.org/10.1088/0022-3727/40/5/s09.

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Tatara, Gen, Hiroshi Kohno, and Junya Shibata. "Theory of Domain Wall Dynamics under Current." Journal of the Physical Society of Japan 77, no. 3 (March 15, 2008): 031003. http://dx.doi.org/10.1143/jpsj.77.031003.

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Tatara, G., and N. Garcia. "Theory of domain wall resistance in nanocontacts." IEEE Transactions on Magnetics 36, no. 5 (2000): 2839–40. http://dx.doi.org/10.1109/20.908603.

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Lü, H., and C. N. Pope. "Domain Walls from M-Branes." Modern Physics Letters A 12, no. 15 (May 20, 1997): 1087–94. http://dx.doi.org/10.1142/s0217732397001102.

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We discuss the vertical dimensional reduction of M-sbranes to domain walls in D=7 and D=4, by dimensional reduction on Ricci-flat four-manifolds and seven-manifolds. In order to interpret the vertically-reduced five-brane as a domain wall solution of a dimensionally-reduced theory in D=7, it is necessary to generalize the usual Kaluza–Klein ansatz, so that the three-form potential in D=11 has an additional term that can generate the necessary cosmological term in D=7. We show how this can be done for general four-manifolds, extending previous results for toroidal compactifications. By contrast, no generalization of the Kaluza–Klein ansatz is necessary for the compactification of M-theory to a D=4 theory that admits the domain-wall solution coming from the membrane in D=11.
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BANERJEE, A., and TANWI GHOSH. "STATIC DOMAIN WALLS IN BRANS–DICKE THEORY." International Journal of Modern Physics D 07, no. 04 (August 1998): 581–85. http://dx.doi.org/10.1142/s0218271898000395.

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It is already known that the equations of General Relativity are not consistent with Static Domain Wall which is described by the energy momentum Tensor [Formula: see text] and [Formula: see text]. Here it is shown that even in Brans–Dicke Theory of Gravitation the static domain wall with either p = 0 or p = ∊ρ does not exist. In the latter case, we have used the property of reflection symmetry of the wall about x = 0 as well as a general relation between g00 and the Brans–Dicke scalar field and have shown that the metric component g00 changes sign somewhere as we move away from the symmetry plane.
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Dissertations / Theses on the topic "Domain wall theory"

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Curtis, Ryan. "Theory of current-driven domain wall motion in artificial magnetic domain structures." Thesis, University of Bath, 2015. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.665451.

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This thesis concerns the combination of two overlapping fields in physics: condensed matter and electromagnetism. Specifically the problem posed of simulating the movement of magnetic domains by applied magnetic, and electric, fields. In this investigation electronic structure methods are used in an attempt to parametrise longer length-scale micromagnetic simulations. Previous works in the field have relied upon suitable experiments having been conducted, whereas this work can stand alone - albeit with its own propagation of systematic errors. Modelling is undertaken to predict the applicability of cobalt platinum multilayers as a new type of computer memory. Although results are promising, features not in the remit of this thesis, such as practicality, are noted to be major obstacles that would need to be overcome. Ab initio methods are used with varying success to predict the saturation magnetisation, Gilbert damping parameter, and anisotropy parameter of cobalt platinum systems.
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Antonio, David J. "2+1 flavour domain wall QCD : light meson spectrum, leptonic decays and neutral kaon mixing." Thesis, University of Edinburgh, 2008. http://hdl.handle.net/1842/2391.

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We study light hadron phenomenology using Lattice QCD. We focus on the calculations of the light pseudoscalar quantities: masses, decay constants and B-parameters; in particular the calculation of the Kaon B-parameter, BK, which when combined with experimental results yields a constraint of the unitarity triangle apex. We describe a calculation with 2+1 dynamical flavours of Domain Wall Fermions on two lattice volumes, with a lattice spacing a = 0:1 fm. The Iwasaki gauge action was used with coupling beta = 2:13 and the extent of the fifth dimension was Ls = 16. Following a brief review of continuum QCD and Lattice QCD we describe the Domain Wall formalism and the lattice methods used to calculate physical quantities. We present results from the two simulations and make comparisons with next-to-leading order chiral perturbation theory. We study the region of validity of chiral perturbation theory and calculate the associated low energy constants. We find these to agree with phenomenological estimates and other lattice calculations. We calculate the physical decay constants and find them to be in relatively good agreement with experimental values. We present a renormalised value for BK which includes systematic error estimates.
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Vaduret, Jean-François. "GPPZ and the Holographic Triforce against Scalars." Thesis, Uppsala universitet, Teoretisk fysik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-397107.

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We use gauge-invariant cosmological perturbation theory to compute one-point functions of active and inert scalar fields of the GPPZ RG-flow in AdS5. Linearized Einstein equations are computed and made gauge-invariant for D-dimensional Euclidean domain-wall geometry. We briefly review the procedure of holographic renormalization for the GPPZ RG-flow in AdS5 to get different one-point functions. The source-dependant vev of the operator dual to the ∆ = 3 active scalar field in the GPPZ solution is computed and agrees with literature. We also find the source-dependant one-point function of the operator dual to the ∆ = 3 inert scalar.
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BOTTO, DAVIDE. "Dynamical transitions in driven diffusive models." Doctoral thesis, Politecnico di Torino, 2020. http://hdl.handle.net/11583/2790160.

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FOGGETTI, FRANCESCO. "Modulated magnetic and structural states, Dynamics and functionalities." Doctoral thesis, Università degli studi di Genova, 2021. http://hdl.handle.net/11567/1048528.

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The aim of this thesis is to describe a number of materials that have attracted interest due to their magnetic, electric or structural properties with the use of generalized models. In hexagonal multiferroic LuFeO3 the study of the magnetic excitations in the material reveals the presence of elusive topological objects (i.e. effective magnetic monopoles and toroidal moments) not previously reported as well ad the non-reciprocal character of particular magnons in the material. The model and the results can be generalized to the class of hexagonal multiferroics. In the case of TbMnO3 we analyze the excitation spectrum of a cycloidal spin system that exhibit improper ferroelectricity. The results reveal that soft electromagnons have a large contribution, due to domain wall-localized modes, to the static dielectric constant of the material and, in general, of the cycloidal systems. A study of the response of GaV4S8 to photoexcitation is performed through atomistic spin dynamics simulations. Thermal properties of GaV4S8 are discovered to be related to the magnetic phases of the material due to the changing magnon transport properties of different magnetic phases. A change of the order of 2 in the thermal conductivity is observed in the transition from cycloidal to ferromagnetic phases A study of improper ferroelectricity in hybrid organic-inorganic perovskites is performed by using a Landau type symmetry breaking theory. The theory shows a rich phase diagram and the presence of nested domain walls. The theory describes a molecular ordering mechanism as a possible explanation for weak improper ferroelectricity observed in NH2(CH3)2Fe(COOH)3. The decade-long problem of the stripe ordering in IrTe2 is addressed. The existing observations of different striped phases in the material are reproduced in this study through a combination of first principle calculations and a phenomenological model. The same model predicts a phase diagram for the dimerized phases in the shape of a Devil's Staircase. This result partially fills a gap in the knowledge about IrTe, up to date no exhaustive explanation is known for the dimerization mechanism, and no other information on the dimerized phase diagram was available aside of the results reproduced in this work. The essence of this work is that minimalistic models and general considerations about energy and symmetries are powerful tools to describe quite diverse problems. This thesis address the importance of the excitations in the properties of certain materials and points out features that have not been previously reported in literature.
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Niro, Pierluigi. "Strong coupling in 2+1 dimensions from dualities, holography, and large N." Doctoral thesis, Universite Libre de Bruxelles, 2021. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/327659.

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The goal of the original research presented in this thesis is to study the strong coupling regime of Quantum Field Theories (QFTs) with different methods, making concrete predictions about the phase structure and the dynamics of these theories, and on their observables. The focus is on (gauge) field theories in three spacetime dimensions, which are an interesting laboratory to understand the properties of strong coupling in setups that are usually simpler than in the more familiar case of gauge theories in four dimensions. Importantly, topological effects play a relevant role in three dimensions, thanks to the presence of the so-called Chern-Simons term.The thesis contains a short introduction to QFTs in 3d, principles and applications of infrared dualities, large N techniques, and holography. Indeed, the web of infrared dualities, the large N expansion, and the holographic correspondence between QFT and gravity are the main tools which we use to investigate the strongly coupled regimes of 3d QFTs.Then, the original material is presented. In a first line of research, we focus on the study of the phase diagram of a 3d gauge theory making use of conjectured infrared dualities, extending such dualities to the case where more than one mass parameter can be dialed. In a second line of research, we study a class of 3d gauge theories by engineering their gravity dual in a string theory setup. We prove the existence of multiple phase transitions between phases characterized by both massless particles and topological sectors. In a third line of research, we use holography as a tool to explore the interplay between the physics of 4d QCD and 3d gauge theories. In particular, we analyze the properties of 3d domain walls, which appear as soliton-like solutions of 4d QCD in specific parametric regimes. Finally, we propose a boundary construction of 3d large N vector models, which appear as critical points of theories obtained by coupling degrees of freedom localized on a 3d boundary to a 4d bulk theory. This construction allows to prove new dualities and uncovers a new computational tool for 3d vector models.
Doctorat en Sciences
info:eu-repo/semantics/nonPublished
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AIT, ALDJET BOUHADEF KHEDIDJA. "Evaporation d'eau entre plaques parallèles humides sous l'effet d'un écoulement d'air en convection forcée : application à l'évaluation des transferts couplés de chaleur et de masse." Poitiers, 1988. http://www.theses.fr/1988POIT2009.

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Le modele theorique est vase sur la resolution des equations couplees de transport-diffusion de masse et de chaleur, au sein du fluide en ecoulement, pour un regime de couches limites laminaires bidimensionnelles stationnaires. Le couplage des deux problemes thermique et massique est realise par l'intermediaire des conditions parietales. Des correlations sont etablies entre le coefficient de transfert de masse et les parametres adimensionnels caracterisant le probleme. Des performances d'evaporation, suivant les debits d'air et les conditions d'entree imposees, en decoulent. Des resultats experimentaux detailles, sur l'exploration des champs de vitesses, temperatures, et humidites locales, sont ensuite presentes pour les deux cas de regime: laminaire et turbulent. Les coefficients d'echange massique, local et global sont egalement evalues
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Nguyen, Hoang Phuong. "Résultats de compacité et régularité dans un modèle de Ginzburg-Landau non-local issu du micromagnétisme. Lemme de Poincaré et régularité du domaine." Thesis, Toulouse 3, 2019. http://www.theses.fr/2019TOU30315.

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Dans cette thèse, nous étudions des problèmes aux limites impliquant le modèle micro-magnétique et les formes différentielles. Dans la première partie, nous considérons un modèle non-local de Ginzburg-Landau apparaissant en micromagnétisme avec une condition au bord de type Dirichlet. Le modèle typique implique une fonctionelle d'énergie définie pour des applications des valeurs dans la sphère S² et qui depend de plusieurs paramètres, qui représentent des quantités physiques. Une première question concerne la compacité des aimantations ayant les énergies de quelques parois de Néel de longueur finie et des défauts topologiques lorsque ces paramètres convergent vers 0. Notre méthode utilise des techniques développées pour les problèmes de type Ginzburg-Landau sur la concentration d'énergie autour des vortex, avec un argument d'approximation des champs de vecteurs dans S² par des champs de vecteurs dans S¹ éloignés des vortex. Nous effectuons également en détail la preuve de la régularité C^infini à l'intérieur et la régularité C(^1,alpha) au bord, pour tous les alpha appartiennent à (0, 1/2 ), des points critiques du modèle. Dans la deuxième partie, nous étudions le lemme de Poincaré qui affirme que sur un domaine simplement connexe chaque forme fermée est exacte. Nous prouvons le lemme de Poincaré sur un domaine avec une condition aux limites de Dirichlet sous une hypothèse naturelle sur la régularité du domaine : une forme fermée ƒ dans l'espace C(^r,alpha) est la différentielle d'une forme C(^r+1,alpha) à condition que le domaine lui-même soit C(^r+1,alpha). La preuve est basée sur une construction par approximation, avec un argument de dualité. Nous établissons également le résultat correspondant dans le cadre d'espaces de Sobolev d'ordre supérieur
In this thesis, we study some boundary value problems involving micromagnetic models and differential forms. In the first part, we consider a nonlocal Ginzburg-Landau model arising in micromagnetics with an imposed Dirichlet boundary condition. The model typically involves S²-valued maps with an energy functional depending on several parameters, which represent physical quantities. A first question concerns the compactness of magnetizations having the energies of several Néel walls of finite length and topo- logical defects when these parameters converge to 0. Our method uses techniques developed for Ginzburg-Landau type problems for the concentration of energy on vortex balls, together with an approximation argument of S²-valued vector fields by S¹-valued vector fields away from the vortex balls. We also carry out in detail the proofs of the C^infinite regularity in the interior and C(^1,alpha) regularity up to the boundary, for all alpha belong to (0, 1/2), of critical points of the model. In the second part, we study the Poincaré lemma, which states that on a simply connected domain every closed form is exact. We prove the Poincaré lemma on a domain with a Dirichlet boundary condition under a natural assumption on the regularity of the domain: a closed form ƒ in the Hölder space C(^r,alpha) is the differential of a C(^r+1,alpha) form, provided that the domain itself is C(^r+1,alpha). The proof is based on a construction by approximation, together with a duality argument. We also establish the corresponding statement in the setting of higher order Sobolev spaces
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Dednam, Wynand. "Atomistic simulations of competing influences on electron transport across metal nanocontacts." Thesis, Universidad de Alicante, 2019. http://hdl.handle.net/10500/26155.

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In our pursuit of ever smaller transistors, with greater computational throughput, many questions arise about how material properties change with size, and how these properties may be modelled more accurately. Metallic nanocontacts, especially those for which magnetic properties are important, are of great interest due to their potential spintronic applications. Yet, serious challenges remain from the standpoint of theoretical and computational modelling, particularly with respect to the coupling of the spin and lattice degrees of freedom in ferromagnetic nanocontacts in emerging spintronic technologies. In this thesis, an extended method is developed, and applied for the first time, to model the interplay between magnetism and atomic structure in transition metal nanocontacts. The dynamic evolution of the model contacts emulates the experimental approaches used in scanning tunnelling microscopy and mechanically controllable break junctions, and is realised in this work by classical molecular dynamics and, for the first time, spin-lattice dynamics. The electronic structure of the model contacts is calculated via plane-wave and local-atomic orbital density functional theory, at the scalar- and vector-relativistic level of sophistication. The effects of scalar-relativistic and/or spin-orbit coupling on a number of emergent properties exhibited by transition metal nanocontacts, in experimental measurements of conductance, are elucidated by non-equilibrium Green’s Function quantum transport calculations. The impact of relativistic effects during contact formation in non-magnetic gold is quantified, and it is found that scalar-relativistic effects enhance the force of attraction between gold atoms much more than between between atoms which do not have significant relativistic effects, such as silver atoms. The role of non-collinear magnetism in the electronic transport of iron and nickel nanocontacts is clarified, and it is found that the most-likely conductance values reported for these metals, at first- and lastcontact, are determined by geometrical factors, such as the degree of covalent bonding in iron, and the preference of a certain crystallographic orientation in nickel.
Physics
Ph. D. (Physics)
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Ferrero, Eduardo Ezequiel. "Dinámica de relajación del modelo de Potts de q estados bidimensional: una contribución a la descripción de propiedades de no-equilibrio en transiciones de fase de primer orden." Doctoral thesis, 2011. http://hdl.handle.net/11086/163.

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Tesis (Doctor en Física)--Universidad Nacional de Córdoba. Facultad de Matemática, Astronomía y Física, 2011.
Estudiamos el modelo de Potts de q estados bidimensional, que presenta transiciones de fase magnéticas con temperatura de primer (q > 4) y segundo orden (q = 4). Trabajamos con simulaciones tipo Monte Carlo para las cuales implementamos distintas técnicas algorítmicas, incluyendo una implementación en GPUs. No obstante, presentamos también algunos resultados analíticos. Analizamos la Dinámica de Tiempos Cortos en la aproximación de Campo Medio del modelo de Potts con q=2 resolviendo exactamente la ecuación de Fokker-Planck asociada a la dinámica de Glauber. Confirmamos la validez de la hipótesis de escala de la Dinámica de Tiempos Cortos tanto cerca del punto crítico como de puntos spinodales. Mostramos que es posible definir el punto spinodal a partir del comportamiento dinámico del sistema a tiempos cortos. Estudiamos la metaestabilidad asociada a la transición de fase de primer orden para el modelo de Potts de q estados con q > 4. Realizamos un estudio sistemático de la dinámica del modelo de Potts luego de un enfriamiento brusco a temperaturas subcríticas. Para q > 4 advertimos la existencia de diferentes regímenes dinámicos, de acuerdo al rango de temperaturas. Caracterizamos estos regímenes y los correspondientes estados del sistema.
We analyze the bidimensional q-state Potts model, a paradigmatic model in the study of Statistical Mechanics of Critical Phenomena and Phase Transitions, which presents first (q > 4) and second order (q ≤ 4) temperature driven magnetic phase transitions and has shown a very rich dynamic phenomenology. We mostly work on Monte Carlo numerical simulations, for which we have implemented different algorithm techniques, both traditional and original, including an implementation to run code on graphics cards. Nevertheless, we also present analytic results for some cases where this approach was possible. We study the Short Time Dynamics in the Mean-Field approximation for the 2-states Potts model (the Curie-Weiss model) solving the Fockker-Planck equation associated to the Glauber dynamics for this model. We obtain closed-form expressions for the first moments of the order parameter, near to both the critical and spinodal points, starting from different initial conditions. We confirm the validity of the short-time dynamical scaling hypothesis in both cases. We show that it is possible to define the spinodal point through the short time dynamical behaviour of the system; our definition works both for meanfield and short-range interactions systems. We study the the first order phase transition associated metastability for the q-state Potts model with q >4. We show that the spinodal point is clearly separated from the transition point for all q > 4, delimiting an interval of temperatures capable to hold metastable states. We provide numerical evidence for the existence of metastable states associated to the first order phase transition. We analyze the relaxation mechanism from these states to equilibrium. We perform a systematic study about the nonequilibrium dynamics of the Potts model on the square lattice after a quench from infinite to subcritical temperatures. We analyze the long term behaviour of the energy and relaxation time for a wide range of quench temperatures and system sizes. For q > 4 we found the existence of different dynamical regimes, according to quench temperature range. We characterize those regimes and the system’s corresponding states. We analyze in detail the finite size scaling properties of different relaxation times involved, as well as their temperature dependency.
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Books on the topic "Domain wall theory"

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Dirk, Noetzold, Fermi National Accelerator Laboratory, and United States. National Aeronautics and Space Administration., eds. An exact solution for a thick domain wall in general relativity. [Batavia, Ill.?]: Fermi National Accelerator Laboratory, 1990.

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Meier, Dennis, Jan Seidel, Marty Gregg, and Ramamoorthy Ramesh. Domain Walls. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780198862499.001.0001.

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Technological evolution and revolution are both driven by the discovery of new functionalities, new materials and the design of yet smaller, faster, and more energy-efficient components. Progress is being made at a breathtaking pace, stimulated by the rapidly growing demand for more powerful and readily available information technology. High-speed internet and data-streaming, home automation, tablets and smartphones are now ‘necessities’ for our everyday lives. Consumer expectations for progressively more data storage and exchange appear to be insatiable. In this context, ferroic domain walls have attracted recent attention as a completely new type of oxide interface. In addition to their functional properties, such walls are spatially mobile and can be created, moved, and erased on demand. This unique degree of flexibility enables domain walls to take an active role in future devices and hold a great potential as multifunctional 2D systems for nanoelectronics. With domain walls as reconfigurable electronic 2D components, a new generation of adaptive nano-technology and flexible circuitry becomes possible, that can be altered and upgraded throughout the lifetime of the device. Thus, what started out as fundamental research, at the limit of accessibility, is finally maturing into a promising concept for next-generation technology.
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Solymar, L., D. Walsh, and R. R. A. Syms. Magnetic materials. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198829942.003.0011.

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Macroscopic and microscopic theories of magnetic polarization are discussed. The origin of domains, domain walls, and of the hysteresis curve and the contrast between soft and hard magnetic materials are explained. The more important elements of the quantum theory of magnetism are discussed. The principles of the alignments in antiferromagnetic and ferromagnetic materials are explained. Magnetic resonance phenomena are discussed. Magnetoresistance and spintronics and their device prospects are also discussed at some length.
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Ono, T. Spin-transfer torque in nonuniform magnetic structures. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780198787075.003.0023.

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This chapter defines a magnetic domain wall (DW) as the transition region where the direction of magnetic moments gradually change between two neighbouring domains. It has been pointed out that ferromagnetic materials are not necessarily magnetized to saturation in the absence of an external magnetic field. Instead, they have magnetic domains, within each of which magnetic moments align. The formation of the magnetic domains is energetically favourable because this structure can lower the magnetostatic energy originating from the dipole–dipole interaction. A magnetic vortex realized in a ferromagnetic disk is a typical example of nonuniform magnetic structure. In very small ferromagnetic systems, where a curling spin configuration has been proposed to occur in place of domains, the formation of DWs is not energetically favored.
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Stamenova, M., and S. Sanvito. Atomistic spin-dynamics. Edited by A. V. Narlikar and Y. Y. Fu. Oxford University Press, 2017. http://dx.doi.org/10.1093/oxfordhb/9780199533046.013.7.

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This article reviews recent advances towards the development of a truly atomistic time-dependent theory for spin-dynamics. The focus is on the s-d tight-binding model [where conduction electrons (s) are exchange-coupled to a number of classical spins (d)], including electrostatic corrections at the Hartree level, as the underlying electronic structure theory. In particular, the article considers one-dimensional (1D) magnetic atomic wires and their electronic structure, described by means of the s-d model. The discussion begins with an overview of the model spin Hamiltonian, followed by molecular-dynamics simulations of spin-wave dispersion in a s-d monoatomic chain and spin impurities in a non-magnetic chain. The current-induced motion in a magnetic domain wall (DW) is also explored, along with how an electric current can affect the magnetization landscape of a magnetic nano-object. The article concludes with an assessment of spin-motive force, and especially whether a driven magnetization dynamics can generate an electrical signal.
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Karapetrov, G., S. A. Moore, and M. Iavarone. Mesoscopic Effects in Superconductor–Ferromagnet Hybrids. Edited by A. V. Narlikar. Oxford University Press, 2017. http://dx.doi.org/10.1093/oxfordhb/9780198738169.013.8.

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This article examines the occurrence of mesoscopic effects in superconductor-ferromagnet hybrids. It begins with an overview of theories underpinning superconducting/ferromagnetic (S/F) hybrid structures, focusing on their vortex nucleation conditions and vortex behavior as well as the localized nucleation of superconductivity in an ideal S/F system. It then presents experimental measurements of the localized superconducting state in the cases of domain wall and reverse domain superconductivity, along with the vortex state in planar S/F hybrids. In particular, it considers nucleation thresholds for superconducting vortices and equilibrium vortex configurations. Finally, it discusses the results of local scanning probe measurements of the novel mesoscopic effects that emerge in magnetically coupled S/F hybrid structures in the absence of proximity effects.
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Chemin, Jean-Yves, Benoit Desjardins, Isabelle Gallagher, and Emmanuel Grenier. Mathematical Geophysics. Oxford University Press, 2006. http://dx.doi.org/10.1093/oso/9780198571339.001.0001.

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Aimed at graduate students, researchers and academics in mathematics, engineering, oceanography, meteorology, and mechanics, this text provides a detailed introduction to the physical theory of rotating fluids, a significant part of geophysical fluid dynamics. The text is divided into four parts, with the first part providing the physical background of the geophysical models to be analyzed. Part two is devoted to a self contained proof of the existence of weak (or strong) solutions to the imcompressible Navier-Stokes equations. Part three deals with the rapidly rotating Navier-Stokes equations, first in the whole space, where dispersion effects are considered. The case where the domain has periodic boundary conditions is then analyzed, and finally rotating Navier-Stokes equations between two plates are studied, both in the case of periodic horizontal coordinated and those in R2. In Part IV, the stability of Ekman boundary layers and boundary layer effects in magnetohydrodynamics and quasigeostrophic equations are discussed. The boundary layers which appear near vertical walls are presented and formally linked with the classical Prandlt equations. Finally spherical layers are introduced, whose study is completely open.
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Book chapters on the topic "Domain wall theory"

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Bar'yakhtar, Victor G., Mikhail V. Chetkin, Boris A. Ivanov, and Sergei N. Gadetskii. "Microscopic theory of relaxation of domain wall." In Dynamics of Topological Magnetic Solitons, 96–112. Berlin, Heidelberg: Springer Berlin Heidelberg, 1994. http://dx.doi.org/10.1007/bfb0046000.

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Cahn, J. W., and S. M. Allen. "A Microscopic Theory for Domain Wall Motion and Its Experimental Verification in Fe-Al Alloy Domain Growth Kinetics." In The Selected Works of John W. Cahn, 369–72. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118788295.ch36.

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Cahn, J. W., and S. M. Allen. "A Microscopic Theory for Domain Wall Motion and Its Experimental Verification in Fe-Al Alloy Domain Growth Kinetics." In The Selected Works of John W. Cahn, 373–76. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118788295.ch37.

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Torres, Manuel. "Domain Walls in a Chern-Simons Theory." In Solitons, 269–72. New York, NY: Springer New York, 2000. http://dx.doi.org/10.1007/978-1-4612-1254-6_34.

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Bergshoeff, E., U. Gran, and D. Roest. "Type Iib 7-Brane Solutions From Nine-Dimensional Domain Walls." In Progress in String, Field and Particle Theory, 397–400. Dordrecht: Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-010-0211-0_23.

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Koiller, Belita, Mark O. Robbins, Hong Ji, and C. S. Nolle. "Morphology and Dynamics of Domain-Wall Motion in Disordered Two-Dimensional Magnets." In New Trends in Magnetism, Magnetic Materials, and Their Applications, 75–84. Boston, MA: Springer US, 1994. http://dx.doi.org/10.1007/978-1-4899-1334-0_9.

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Beyer, Dirk, and Philipp Wendler. "CPU Energy Meter: A Tool for Energy-Aware Algorithms Engineering." In Tools and Algorithms for the Construction and Analysis of Systems, 126–33. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-45237-7_8.

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Abstract Verification algorithms are among the most resource-intensive computation tasks. Saving energy is important for our living environment and to save cost in data centers. Yet, researchers compare the efficiency of algorithms still in terms of consumption of CPU time (or even wall time). Perhaps one reason for this is that measuring energy consumption of computational processes is not as convenient as measuring the consumed time and there is no sufficient tool support. To close this gap, we contribute CPU Energy Meter, a small tool that takes care of reading the energy values that Intel CPUs track inside the chip. In order to make energy measurements as easy as possible, we integrated CPU Energy Meter into BenchExec, a benchmarking tool that is already used by many researchers and competitions in the domain of formal methods. As evidence for usefulness, we explored the energy consumption of some state-of-the-art verifiers and report some interesting insights, for example, that energy consumption is not necessarily correlated with CPU time.
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Tselev, A., A. V. Ievlev, R. Vasudevan, S. V. Kalinin, P. Maksymovych, and A. Morozovska. "Landau–Ginzburg–Devonshire Theory for Domain Wall Conduction and Observation of Microwave Conduction of Domain Walls." In Domain Walls, 271–92. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780198862499.003.0012.

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This chapter concerns DW electrical conduction. It first addresses the phenomenology of charged domain walls in the context of a Landau-Ginzburg-Devonshire (LGD) model for the ferroelectric semiconductor with analysis of the DW conductivity associated with accumulation of charge carriers near domain walls. It is revealed that there exists an interplay between the wall type — head-to-head or tail-to-tail — and conduction type of the semiconductor ferroelectric with a strong dependence of the domain wall conductivity on the wall orientation. The chapter then reviews observations of high-frequency — in the gigahertz frequency range — ac conductivity along the nominally uncharged 180-degree domain walls in a uniaxial Pb(Zr0.2Ti0.8)O3 epitaxial film. Measurements of the conduction at high frequencies are insensitive to presence of a Schottky barrier and the electrode-ferroelectric interface.
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Falloon, P., V. Gopar, R. Jalabert, D. Weinmann, and R. Stamps. "Domain Wall Magnetoresistance in Magnetic Nanowires—Theory." In Series in Material Science and Engineering, 203–23. Taylor & Francis, 2006. http://dx.doi.org/10.1201/9781420021257.ch9.

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Íñiguez, J. "First-Principles Studies of Structural Domain Walls." In Domain Walls, 36–75. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780198862499.003.0003.

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This chapter discusses representative first-principles studies of structural domain walls in ferroics, focusing on the compounds that have received most attention by the simulations community so far: perovskite oxides. It describes in some detail a reduced number of case studies that come handy to illustrate different effects and to highlight the added value of the first-principles investigations. As regards the simulation methods, the chapter focuses on applications of density functional theory (DFT), typically employing an approximation for an effective treatment of ionic cores. A discussion on the application to domain-wall problems of first-principles-based methods for large-scale simulations of ferroelectrics and ferroelastics is also included. Finally, this chapter briefly on the opportunities and challenges for first-principles research in this field.
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Conference papers on the topic "Domain wall theory"

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Hoelbling, Christian, and Christian Zielinski. "Staggered domain wall fermions." In 34th annual International Symposium on Lattice Field Theory. Trieste, Italy: Sissa Medialab, 2016. http://dx.doi.org/10.22323/1.256.0254.

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Fukaya, Hidenori, Sinya Aoki, Guido Cossu, Shoji Hashimoto, Takashi Kaneko, and Junichi Noaki. "Overlap/Domain-wall reweighting." In 31st International Symposium on Lattice Field Theory LATTICE 2013. Trieste, Italy: Sissa Medialab, 2014. http://dx.doi.org/10.22323/1.187.0127.

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Boyle, Peter, Christopher Kelly, and Azusa Yamaguchi. "Algorithms for domain wall Fermions." In The 38th International Symposium on Lattice Field Theory. Trieste, Italy: Sissa Medialab, 2022. http://dx.doi.org/10.22323/1.396.0470.

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Shirman, Yuri. "Chiral gauge theory on AdS domain wall." In PARTICLES, STRINGS, AND COSMOLOGY: 11th International Symposium on Particles, Strings, and Cosmology; PASCOS 2005. AIP, 2005. http://dx.doi.org/10.1063/1.2149711.

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TATARA, GEN, HIROSHI KOHNO, JUNYA SHIBATA, and EIJI SAITOH. "THEORY OF CURRENT-DRIVEN DOMAIN WALL DYNAMICS." In Proceedings of the 1st International Symposium on TOP2005. WORLD SCIENTIFIC, 2006. http://dx.doi.org/10.1142/9789812772879_0056.

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TATARA, G., H. KOHNO, J. SHIBATA, and E. SAITOH. "THEORY OF CURRENT-DRIVEN DOMAIN WALL DYNAMICS." In Proceedings of the 8th International Symposium. WORLD SCIENTIFIC, 2006. http://dx.doi.org/10.1142/9789812773210_0037.

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Cohen, Saul, Richard C. Brower, Michael Clark, and James Osborn. "Multigrid Algorithms for Domain-Wall Fermions." In XXIX International Symposium on Lattice Field Theory. Trieste, Italy: Sissa Medialab, 2012. http://dx.doi.org/10.22323/1.139.0030.

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Cheng, Michael. "QCD Thermodynamics from Domain Wall Fermion." In The XXVI International Symposium on Lattice Field Theory. Trieste, Italy: Sissa Medialab, 2009. http://dx.doi.org/10.22323/1.066.0180.

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Kimura, Taro. "Domain-wall, overlap, and topological insulators." In The 33rd International Symposium on Lattice Field Theory. Trieste, Italy: Sissa Medialab, 2016. http://dx.doi.org/10.22323/1.251.0042.

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Aoki, Shoto, and Hidenori Fukaya. "Chiral fermion on curved domain-wall." In The 38th International Symposium on Lattice Field Theory. Trieste, Italy: Sissa Medialab, 2022. http://dx.doi.org/10.22323/1.396.0535.

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Reports on the topic "Domain wall theory"

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Silverstein, E. M. Self-tuning flat domain walls in 5d gravity and string theory. Office of Scientific and Technical Information (OSTI), February 2000. http://dx.doi.org/10.2172/753284.

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Schulz, M. Domain Walls, Branes, and Fluxes in String Theory: New Ideas on the Cosmological Constant Problem, Moduli Stabilization, and Vacuum Connectedness. Office of Scientific and Technical Information (OSTI), April 2005. http://dx.doi.org/10.2172/839826.

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Sadot, Einat, Christopher Staiger, and Mohamad Abu-Abied. Studies of Novel Cytoskeletal Regulatory Proteins that are Involved in Abiotic Stress Signaling. United States Department of Agriculture, September 2011. http://dx.doi.org/10.32747/2011.7592652.bard.

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In the original proposal we planned to focus on two proteins related to the actin cytoskeleton: TCH2, a touch-induced calmodulin-like protein which was found by us to interact with the IQ domain of myosin VIII, ATM1; and ERD10, a dehydrin which was found to associate with actin filaments. As reported previously, no other dehydrins were found to interact with actin filaments. In addition so far we were unsuccessful in confirming the interaction of TCH2 with myosin VIII using other methods. In addition, no other myosin light chain candidates were found in a yeast two hybrid survey. Nevertheless we have made a significant progress in our studies of the role of myosins in plant cells. Plant myosins have been implicated in various cellular activities, such as cytoplasmic streaming (1, 2), plasmodesmata function (3-5), organelle movement (6-10), cytokinesis (4, 11, 12), endocytosis (4, 5, 13-15) and targeted RNA transport (16). Plant myosins belong to two main groups of unconventional myosins: myosin XI and myosin VIII, both closely related to myosin V (17-19). The Arabidopsis myosin family contains 17 members: 13 myosin XI and four myosin VIII (19, 20). The data obtained from our research of myosins was published in two papers acknowledging BARD funding. To address whether specific myosins are involved with the motility of specific organelles, we cloned the cDNAs from neck to tail of all 17 Arabidopsis myosins. These were fused to GFP and used as dominant negative mutants that interact with their cargo but are unable to walk along actin filaments. Therefore arrested organelle movement in the presence of such a construct shows that a particular myosin is involved with the movement of that particular organelle. While no mutually exclusive connections between specific myosins and organelles were found, based on overexpression of dominant negative tail constructs, a group of six myosins (XIC, XIE, XIK, XI-I, MYA1 and MYA2) were found to be more important for the motility of Golgi bodies and mitochondria in Nicotiana benthamiana and Nicotiana tabacum (8). Further deep and thorough analysis of myosin XIK revealed a potential regulation by head and tail interaction (Avisar et al., 2011). A similar regulatory mechanism has been reported for animal myosin V and VIIa (21, 22). In was shown that myosin V in the inhibited state is in a folded conformation such that the tail domain interacts with the head domain, inhibiting its ATPase and actinbinding activities. Cargo binding, high Ca2+, and/or phosphorylation may reduce the interaction between the head and tail domains, thus restoring its activity (23). Our collaborative work focuses on the characterization of the head tail interaction of myosin XIK. For this purpose the Israeli group built yeast expression vectors encoding the myosin XIK head. In addition, GST fusions of the wild-type tail as well as a tail mutated in the amino acids that mediate head to tail interaction. These were sent to the US group who is working on the isolation of recombinant proteins and performing the in vitro assays. While stress signals involve changes in Ca2+ levels in plants cells, the cytoplasmic streaming is sensitive to Ca2+. Therefore plant myosin activity is possibly regulated by stress. This finding is directly related to the goal of the original proposal.
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Sessa, Guido, and Gregory Martin. MAP kinase cascades activated by SlMAPKKKε and their involvement in tomato resistance to bacterial pathogens. United States Department of Agriculture, January 2012. http://dx.doi.org/10.32747/2012.7699834.bard.

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The research problem: Pseudomonas syringae pv. tomato (Pst) and Xanthomonas campestrispv. vesicatoria (Xcv) are the causal agents of tomato bacterial speck and spot diseases, respectively. These pathogens colonize the aerial parts of the plant and cause economically important losses to tomato yield worldwide. Control of speck and spot diseases by cultural practices or chemicals is not effective and genetic sources of resistance are very limited. In previous research supported by BARD, by gene expression profiling we identified signaling components involved in resistance to Xcvstrains. Follow up experiments revealed that a tomato gene encoding a MAP kinase kinase kinase (MAPKKKe) is required for resistance to Xcvand Pststrains. Goals: Central goal of this research was to investigate the molecular mechanisms by which MAPKKKεand associated MAP kinase cascades regulate host resistance. Specific objectives were to: 1. Determine whether MAPKKKεplays a broad role in defense signaling in plants; 2. Identify components of MAP kinase cascades acting downstream of MAPKKKε; 3. Determine the role of phosphorylation-related events in the function of MAPKKKε; 4. Isolate proteins directly activated by MAPKKKε-associatedMAPK modules. Our main achievements during this research program are in the following major areas: 1. Characterization of MAPKKKεas a positive regulator of cell death and dissection of downstream MAP kinase cascades (Melech-Bonfil et al., 2010; Melech-Bonfil and Sessa, 2011). The MAPKKKεgene was found to be required for tomato resistance to Xcvand Pstbacterial strains and for hypersensitive response cell death triggered by different R gene/effector gene pairs. In addition, overexpression analysis demonstrated that MAPKKKεis a positive regulator of cell death, whose activity depends on an intact kinase catalytic domain. Epistatic experiments delineated a signaling cascade downstream of MAPKKKεand identified SIPKK as a negative regulator of MAPKKKε-mediated cell death. Finally, genes encoding MAP kinase components downstream of MAPKKKεwere shown to contribute to tomato resistance to Xcv. 2. Identification of tomato proteins that interact with MAPKKKεand play a role in plant immunity (Oh et al., 2011). We identified proteins that interact with MAPKKKε. Among them, the 14-3-3 protein TFT7 was required for cell death mediated by several R proteins. In addition, TFT7 interacted with the MAPKK SlMKK2 and formed homodimersin vivo. Thus, TFT7 is proposed to recruit SlMKK2 and MAPKKK client proteins for efficient signal transfer. 3. Development of a chemical genetic approach to identify substrates of MAPKKKε-activated MAP kinase cascades (Salomon et al., 2009, 2011). This approach is based on engineering the kinase of interest to accept unnatural ATP analogs. For its implementation to identify substrates of MAPKKKε-activated MAP kinase modules, we sensitized the tomato MAP kinase SlMPK3 to ATP analogs and verified its ability to use them as phosphodonors. By using the sensitized SlMPK3 and radiolabeled N6(benzyl)ATP it should be possible to tag direct substrates of this kinase. 4. Development of methods to study immunity triggered by pathogen-associated molecular patterns (PAMPs) in tomato and N. benthamiana plants (Kim et al., 2009; Nguyen et al. 2010). We developed protocols for measuring various PTI-associatedphenotypes, including bacterial populations after pretreatment of leaves with PAMPs, induction of reporter genes, callose deposition at the cell wall, activation of MAP kinases, and a luciferase-based reporter system for use in protoplasts. Scientific and agricultural significance: Our research activities discovered and characterized a signal transduction pathway mediating plant immunity to bacterial pathogens. Increased understanding of molecular mechanisms of immunity will allow them to be manipulated by both molecular breeding and genetic engineering to produce plants with enhanced natural defense against disease. In addition, we successfully developed new biochemical and molecular methods that can be implemented in the study of plant immunity and other aspects of plant biology.
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Morrison, Mark, Joshuah Miron, Edward A. Bayer, and Raphael Lamed. Molecular Analysis of Cellulosome Organization in Ruminococcus Albus and Fibrobacter Intestinalis for Optimization of Fiber Digestibility in Ruminants. United States Department of Agriculture, March 2004. http://dx.doi.org/10.32747/2004.7586475.bard.

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Improving plant cell wall (fiber) degradation remains one of the highest priority research goals for all ruminant enterprises dependent on forages, hay, silage, or other fibrous byproducts as energy sources, because it governs the provision of energy-yielding nutrients to the host animal. Although the predominant species of microbes responsible for ruminal fiber degradation are culturable, the enzymology and genetics underpinning the process are poorly defined. In that context, there were two broad objectives for this proposal. The first objective was to identify the key cellulosomal components in Ruminococcus albus and to characterize their structural features as well as regulation of their expression, in response to polysaccharides and (or) P AA/PPA. The second objective was to evaluate the similarities in the structure and architecture of cellulosomal components between R. albus and other ruminal and non-ruminal cellulolytic bacteria. The cooperation among the investigators resulted in the identification of two glycoside hydrolases rate-limiting to cellulose degradation by Ruminococcus albus (Cel48A and CeI9B) and our demonstration that these enzymes possess a novel modular architecture specific to this bacterium (Devillard et al. 2004). We have now shown that the novel X-domains in Cel48A and Cel9B represent a new type of carbohydrate binding module, and the enzymes are not part of a ceiluiosome-like complex (CBM37, Xu et al. 2004). Both Cel48A and Cel9B are conditionally expressed in response to P AA/PPA, explaining why cellulose degradation in this bacterium is affected by the availability of these compounds, but additional studies have shown for the first time that neither PAA nor PPA influence xylan degradation by R. albus (Reveneau et al. 2003). Additionally, the R. albus genome sequencing project, led by the PI. Morrison, has supported our identification of many dockerin containing proteins. However, the identification of gene(s) encoding a scaffoldin has been more elusive, and recombinant proteins encoding candidate cohesin modules are now being used in Israel to verify the existence of dockerin-cohesin interactions and cellulosome production by R. albus. The Israeli partners have also conducted virtually all of the studies specific to the second Objective of the proposal. Comparative blotting studies have been conducted using specific antibodies prepare against purified recombinant cohesins and X-domains, derived from cellulosomal scaffoldins of R. flavefaciens 17, a Clostridium thermocellum mutant-preabsorbed antibody preparation, or against CbpC (fimbrial protein) of R. albus 8. The data also suggest that additional cellulolytic bacteria including Fibrobacter succinogenes S85, F. intestinalis DR7 and Butyrivibrio fibrisolvens Dl may also employ cellulosomal modules similar to those of R. flavefaciens 17. Collectively, our work during the grant period has shown that R. albus and other ruminal bacteria employ several novel mechanisms for their adhesion to plant surfaces, and produce both cellulosomal and non-cellulosomal forms of glycoside hydrolases underpinning plant fiber degradation. These improvements in our mechanistic understanding of bacterial adhesion and enzyme regulation now offers the potential to: i) optimize ruminal and hindgut conditions by dietary additives to maximize fiber degradation (e.g. by the addition of select enzymes or PAA/PPA); ii) identify plant-borne influences on adhesion and fiber-degradation, which might be overcome (or improved) by conventional breeding or transgenic plant technologies and; iii) engineer or select microbes with improved adhesion capabilities, cellulosome assembly and fiber degradation. The potential benefits associated with this research proposal are likely to be realized in the medium term (5-10 years).
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