Search Results - "Wittmer, J P"

Shear Modulus and Shear-Stress Fluctuations in Polymer Glasses by Kriuchevskyi, I, Wittmer, J P, Meyer, H, Baschnagel, J

“…Using molecular dynamics simulation of a standard coarse-grained polymer glass model, we investigate by means of the stress-fluctuation formalism the shear…”
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Fluctuations of non-ergodic stochastic processes by George, G., Klochko, L., Semenov, A. N., Baschnagel, J., Wittmer, J. P.

“…We investigate the standard deviation δ v ( Δ t ) of the variance v [ x ] of time series x measured over a finite sampling time Δ t focusing on non-ergodic…”
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Long range bond-bond correlations in dense polymer solutions by WITTMER, J. P, MEYER, H, BASCHNAGEL, J, JOHNER, A, OBUKHOV, S, MATTIONI, L, MÜLLER, M, SEMENOY, A. N

“…The scaling of the bond-bond correlation function P1(s) along linear polymer chains is investigated with respect to the curvilinear distance s along the…”
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Continuum limit of amorphous elastic bodies. III. Three-dimensional systems by LEONFORTE, F, BOISSIERE, R, TANGUY, A, WITTMER, J. P, BARRAT, J.-L

“…Extending recent numerical studies on two-dimensional amorphous bodies, we characterize the approach of the elastic continuum limit in three-dimensional…”
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Hyperbranched polymer stars with Gaussian chain statistics revisited by Polińska, P., Gillig, C., Wittmer, J. P., Baschnagel, J.

“…Conformational properties of regular dendrimers and more general hyperbranched polymer stars with Gaussian statistics for the spacer chains between branching…”
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Continuum limit of amorphous elastic bodies II: Linear response to a point source force by LEONFORTE, F, TANGUY, A, WITTMER, J. P, BARRAT, J.-L

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Compressibility and pressure correlations in isotropic solids and fluids by Wittmer, J. P., Xu, H., Polińska, P., Gillig, C., Helfferich, J., Weysser, F., Baschnagel, J.

“…Presenting simple coarse-grained models of isotropic solids and fluids in d = 1 , 2 and 3 dimensions we investigate the correlations of the instantaneous…”
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Why polymer chains in a melt are not random walks by Wittmer, J. P, Beckrich, P, Johner, A, Semenov, A. N, Obukhov, S. P, Meyer, H, Baschnagel, J

“…A cornerstone of modern polymer physics is the “Flory ideality hypothesis” which states that a chain in a polymer melt adopts “ideal” random-walk$\hbox{--}…”
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On the dynamics and disentanglement in thin and two-dimensional polymer films by Meyer, H., Kreer, T., Cavallo, A., Wittmer, J. P., Baschnagel, J.

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Non-ideality of polymer melts confined to nanotubes by Lee, N.-K, Farago, J, Meyer, H, Wittmer, J. P, Baschnagel, J, Obukhov, S. P, Johner, A

“…Corrections to chain ideality have been demonstrated recently for polymer melts in the bulk and in ultrathin films. It has been shown that the effect of…”
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Strictly two-dimensional self-avoiding walks: Thermodynamic properties revisited by Schulmann, N., Xu, H., Meyer, H., Polińska, P., Baschnagel, J., Wittmer, J. P.

“…The density crossover scaling of various thermodynamic properties of solutions and melts of self-avoiding and highly flexible polymer chains without chain…”
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An explanation for the central stress minimum in sand piles by Wittmer, J. P, Claudin, P, Cates, M. E, Bouchaud, J.-P

“…Wittmer et al present a model, which contains no adjustable parameters, that can account for the vertical stress distribution in real sand piles. Results…”
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Simulated glass-forming polymer melts: Glass transition temperature and elastic constants of the glassy state by Schnell, B., Meyer, H., Fond, C., Wittmer, J. P., Baschnagel, J.

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Static Rouse modes and related quantities: Corrections to chain ideality in polymer melts by Meyer, H., Wittmer, J. P., Kreer, T., Beckrich, P., Johner, A., Farago, J., Baschnagel, J.

“… Following the Flory ideality hypothesis intrachain and interchain excluded-volume interactions are supposed to compensate each other in dense polymer…”
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Ensemble fluctuations matter for variances of macroscopic variables by George, G., Klochko, L., Semenov, A. N., Baschnagel, J., Wittmer, J. P.

“…Extending recent work on stress fluctuations in complex fluids and amorphous solids we describe in general terms the ensemble average v ( Δ t ) and the…”
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Different types of spatial correlation functions for non-ergodic stochastic processes of macroscopic systems by Wittmer, J. P., Semenov, A. N., Baschnagel, J.

“…Focusing on non-ergodic macroscopic systems, we reconsider the variances δ O 2 of time averages O [ x ] of time-series x . The total variance δ O tot 2 = δ O…”
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Simple average expression for shear-stress relaxation modulus by Wittmer, J. P., Xu, H., Baschnagel, J.

“…Focusing on isotropic elastic networks we propose a simple-average expression G(t) = mu(A) - h(t) for the computational determination of the shear-stress…”
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Inhomogeneous elastic response of silica glass by Léonforte, F, Tanguy, A, Wittmer, J P, Barrat, J-L

“…Using large scale molecular dynamics simulations we investigate the properties of the nonaffine displacement field induced by macroscopic uniaxial deformation…”
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Melt of polymer rings: The decorated loop model by Obukhov, S., Johner, A., Baschnagel, J., Meyer, H., Wittmer, J. P.

“…Melts of unconcatenated and unknotted polymer rings are a paradigm for soft matter ruled by topological interactions. We propose a description of a system of…”
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Simple models for strictly non-ergodic stochastic processes of macroscopic systems by George, G., Klochko, L., Semenov, A. N., Baschnagel, J., Wittmer, J. P.

“…We investigate simple models for strictly non-ergodic stochastic processes x t ( t being the discrete time step) focusing on the expectation value v and the…”
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