The Experts below are selected from a list of 82308 Experts worldwide ranked by ideXlab platform
Kay Joerg Wiese - One of the best experts on this subject based on the ideXlab platform.
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Random RNA under tension
Europhysics Letters (EPL), 2007Co-Authors: François David, Christian Hagendorf, Kay Joerg WieseAbstract:The Laessig-Wiese (LW) Field theory For the Freezing transition oF random RNA secondary structures is generalized to the situation oF an external Force. We Find a second-order phase transition at a critical applied Force F = F_c. For F F_c, the extension L as a Function oF pulling Force F scales as (F-F_c)^(1/gamma-1). The exponent gamma is calculated in an epsilon-expansion: At 1-loop order gamma = epsilon/2 = 1/2, equivalent to the disorder-Free case. 2-loop results yielding gamma = 0.6 are brieFly mentioned. Using a locking argument, we speculate that this result extends to the strong-disorder phase.
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Random RNA under tension
EPL - Europhysics Letters, 2007Co-Authors: François David, Christian Hagendorf, Kay Joerg WieseAbstract:The Laessig-Wiese (LW) Field theory For the Freezing transition oF random RNA secondary structures is generalized to the situation oF an external Force. We Find a second-order phase transition at a critical applied Force F = F_c. For F < F_c Forces are irrelevant. For F > F_c, the extension L as a Function oF pulling Force F scales as (F-F_c)^(1/gamma-1). The exponent gamma is calculated in an epsilon-expansion: At 1-loop order gamma = epsilon/2 = 1/2, equivalent to the disorder-Free case. 2-loop results yielding gamma = 0.6 are brieFly mentioned. Using a locking argument, we speculate that this result extends to the strong-disorder phase.
Xian-geng Zhao - One of the best experts on this subject based on the ideXlab platform.
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Transitions and transport For a spatially periodic stochastic system with locally coupled oscillators.
Physical review. E Statistical nonlinear and soft matter physics, 2004Co-Authors: Ying-kui Zhao, Xian-geng ZhaoAbstract:In this paper, with a special model, we investigate the spatially periodic stochastic system with locally coupled oscillators subject to a constant Force F. A nonequilibrium second-order phase transition is Found when F=0. This phase transition is reentrant when the additive noise is weak. With varying the constant Force F, a continuous or discontinuous transition between the states with positive and negative mean Fields (mu>0 and mu
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Transitions and transport For a spatially periodic stochastic system with locally coupled oscillators.
Physical Review E, 2004Co-Authors: Ying-kui Zhao, Xian-geng ZhaoAbstract:In this paper, with a special model, we investigate the spatially periodic stochastic system with locally coupled oscillators subject to a constant Force F. A nonequilibrium second-order phase transition is Found when F= 0. This phase transition is reentrant when the additive noise is weak. With varying the constant Force F ,a continuous or discontinuous transition between the states with positive and negative mean Fields (m . 0 and m , 0) is observed, which is not a phase transition. The mean Field or current sometimes exhibits hysteresis as a Function oF F. With the variation oF the Force F, when hysteresis oF the mean Field or current versus F appears, a nonzero probability current with deFinite direction will occur at the point F= 0. The correlation between the additive and multiplicative noises has an eFFect on the transitions and the transport.
O Pouliquen - One of the best experts on this subject based on the ideXlab platform.
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Evidence oF mechanically activated processes in slow granular Flows.
Physical review letters, 2011Co-Authors: K. A. Reddy, Yoel Forterre, O PouliquenAbstract:We study how a shear band in a granular medium dramatically changes the mechanical behavior oF the material Further in the non sheared region. To this end, we carry out a microrheology experiment, where a constant Force $F$ is applied to a small rod immersed outside the shear band. In the absence oF a shear band, a critical Force ${F}_{c}$ is necessary to move the intruder. When a shear band exists, the intruder moves even For a Force $F$ less than the critical Force ${F}_{c}$. We systematically study how the creep velocity ${V}_{\mathrm{creep}}$ oF the rod varies with ${F}_{c}\ensuremath{-}F$ and with the distance to the shear band, and show that the behavior can be described by an Eyring-like activated process.
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Evidence oF Mechanically Activated Processes in Slow Granular Flows
Physical Review Letters, 2011Co-Authors: K Reddy, Yoel Forterre, O PouliquenAbstract:We study how a shear band in a granular medium dramatically changes the mechanical behavior oF the material Further in the non sheared region. To this end, we carry out a microrheology experiment, where a constant Force F is applied to a small rod immersed outside the shear band. In the absence oF a shear band, a critical Force F c is necessary to move the intruder. When a shear band exists, the intruder moves even For a Force F less than the critical Force F c. We systematically study how the creep velocity V creep oF the rod varies with F c À F and with the distance to the shear band, and show that the behavior can be described by an Eyring-like activated process.
François David - One of the best experts on this subject based on the ideXlab platform.
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Random RNA under tension
Europhysics Letters (EPL), 2007Co-Authors: François David, Christian Hagendorf, Kay Joerg WieseAbstract:The Laessig-Wiese (LW) Field theory For the Freezing transition oF random RNA secondary structures is generalized to the situation oF an external Force. We Find a second-order phase transition at a critical applied Force F = F_c. For F F_c, the extension L as a Function oF pulling Force F scales as (F-F_c)^(1/gamma-1). The exponent gamma is calculated in an epsilon-expansion: At 1-loop order gamma = epsilon/2 = 1/2, equivalent to the disorder-Free case. 2-loop results yielding gamma = 0.6 are brieFly mentioned. Using a locking argument, we speculate that this result extends to the strong-disorder phase.
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Random RNA under tension
EPL - Europhysics Letters, 2007Co-Authors: François David, Christian Hagendorf, Kay Joerg WieseAbstract:The Laessig-Wiese (LW) Field theory For the Freezing transition oF random RNA secondary structures is generalized to the situation oF an external Force. We Find a second-order phase transition at a critical applied Force F = F_c. For F < F_c Forces are irrelevant. For F > F_c, the extension L as a Function oF pulling Force F scales as (F-F_c)^(1/gamma-1). The exponent gamma is calculated in an epsilon-expansion: At 1-loop order gamma = epsilon/2 = 1/2, equivalent to the disorder-Free case. 2-loop results yielding gamma = 0.6 are brieFly mentioned. Using a locking argument, we speculate that this result extends to the strong-disorder phase.
Ying-kui Zhao - One of the best experts on this subject based on the ideXlab platform.
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Transitions and transport For a spatially periodic stochastic system with locally coupled oscillators.
Physical review. E Statistical nonlinear and soft matter physics, 2004Co-Authors: Ying-kui Zhao, Xian-geng ZhaoAbstract:In this paper, with a special model, we investigate the spatially periodic stochastic system with locally coupled oscillators subject to a constant Force F. A nonequilibrium second-order phase transition is Found when F=0. This phase transition is reentrant when the additive noise is weak. With varying the constant Force F, a continuous or discontinuous transition between the states with positive and negative mean Fields (mu>0 and mu
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Transitions and transport For a spatially periodic stochastic system with locally coupled oscillators.
Physical Review E, 2004Co-Authors: Ying-kui Zhao, Xian-geng ZhaoAbstract:In this paper, with a special model, we investigate the spatially periodic stochastic system with locally coupled oscillators subject to a constant Force F. A nonequilibrium second-order phase transition is Found when F= 0. This phase transition is reentrant when the additive noise is weak. With varying the constant Force F ,a continuous or discontinuous transition between the states with positive and negative mean Fields (m . 0 and m , 0) is observed, which is not a phase transition. The mean Field or current sometimes exhibits hysteresis as a Function oF F. With the variation oF the Force F, when hysteresis oF the mean Field or current versus F appears, a nonzero probability current with deFinite direction will occur at the point F= 0. The correlation between the additive and multiplicative noises has an eFFect on the transitions and the transport.