]> BibSonomy publications for /author/Wittmer http://www.bibsonomy.org/burst/author/Wittmer BibSonomy BuRST Feed for /author/Wittmer 2008-07-21T00:04:42+02:00 Bibliographie der deutschsprachigen Literatur zur Unternehmensplanung und zum Controlling in Versicherungsunternehmen importedhttp://www.bibsonomy.org/bibtex/23f1ebf961e123b18680a69f251695435/fbw fbw 2008-05-29T13:24:55+02:00 imported
Bibliographie der deutschsprachigen Literatur zur Unternehmensplanung und zum Controlling in Versicherungsunternehmen
{Harald} Maser and {Norbert} Wittmer (2000)
to imported by fbw on 2008-05-29 13:24:55 ]]> EulV, 176 S3., neu bearb. AuflLohmar [u.a.]Bibliographie der deutschsprachigen Literatur zur Unternehmensplanung und zum Controlling in Versicherungsunternehmen2000imported 2008-05-29 13:24:55.0 Multi-level governance of natural resources: tools and processes for water and biodiversity governance in Europe - a European research and training network importedhttp://www.bibsonomy.org/bibtex/27531b9c26bfe82a578cc57aa469527d0/fbw fbw 2008-05-28T17:45:28+02:00 Umweltforschung
Multi-level governance of natural resources: tools and processes for water and biodiversity governance in Europe - a European research and training network
{Felix} Rauschmayer and {Heidi} Wittmer and {Jouni} Paavola (2007)
to Umweltforschung by fbw on 2008-05-28 17:45:28 ]]> UFZ-Umweltforschungszentrum Leipzig-Halle GmbH25 S.Leipzig ; HalleMulti-level governance of natural resources: tools and processes for water and biodiversity governance in Europe - a European research and training network2007Umweltforschung 2008-05-28 17:45:28.0 Jamming and stress propagation in particulate matter Physica Ahttp://www.bibsonomy.org/bibtex/25ea9b78ed594da7f7623d4925b1a775e/smicha smicha 2008-04-22T10:36:30+02:00 imported
Jamming and stress propagation in particulate matter
M. E. Gates and J. P. Wittmer and J. P. Bouchaud and P. Claudin Physica A: Statistical Mechanics and its Applications 263 354--361 (1999)
to imported by smicha on 2008-04-22 10:36:30 ]]> Physica A: Statistical Mechanics and its ApplicationsFeb1-4354--361Jamming and stress propagation in particulate matter2631999imported 012008-04-22 10:36:30.0 Stress propagation in sand Physica Ahttp://www.bibsonomy.org/bibtex/27c3976f3e8ecc775b297c4b27276d1da/smicha smicha 2008-04-22T10:36:30+02:00 imported
Stress propagation in sand
M. E. Cates and J. P. Wittmer Physica A: Statistical and Theoretical Physics 249 276--284 (1998)
to imported by smicha on 2008-04-22 10:36:30 ]]> Physica A: Statistical and Theoretical PhysicsFeb1-4276--284Stress propagation in sand2491998imported 012008-04-22 10:36:30.0 Are polymer melts "ideal". dblphttp://www.bibsonomy.org/bibtex/205003a2e5a2b87500c7b68235adb00a2/dblp dblp 2008-04-03T00:00:00+02:00 dblp
Are polymer melts "ideal".
J. P. Wittmer and P. Beckrich and F. Crevel and C. C. Huang and A. Cavallo and T. Kreer and H. Meyer Computer Physics Communications 177 146-149 (2007)
to dblp by dblp on 2008-04-03 00:00:00 ]]> Computer Physics Communications1-2146-149Are polymer melts "ideal".1772007dblp 2008-04-03 00:00:00.0 Models of stress fluctuations in granular media http://www.bibsonomy.org/bibtex/2a5209c30974860f0caa4da1dc61d7bce/alpe alpe 2008-01-30T12:55:04+01:00 granular shearbib
Models of stress fluctuations in granular media
P. Claudin and J.-P. Bouchad and M. E. Cates and J.-P. Wittmer Phys. Rev. E 57 4441 (1998)
to granular shearbib by alpe on 2008-01-30 12:55:04 ]]> Phys. Rev. E4441Models of stress fluctuations in granular media571998granular shearbib 2008-01-30 12:55:04.0 Correlations in Dense Polymer Solutions http://www.bibsonomy.org/bibtex/206ca3d5d463a2b314ca7742ec41d0d15/statphys23 statphys23 2007-06-20T10:16:09+02:00 correlations long polymer range statphys23 topic-7
Correlations in Dense Polymer Solutions
P. Beckrich and A. Johner and A.N. Semenov and S.P. Obukhov and J.P. Wittmer Abstract Book of the XXIII IUPAP International Conference on Statistical Physics (2007)
to correlations long polymer range statphys23 topic-7 by statphys23 on 2007-06-20 10:16:09 ]]> Genova, ItalyAbstract Book of the XXIII IUPAP International Conference on Statistical Physics9-13 JulyCorrelations in Dense Polymer Solutions2007correlations long polymer range statphys23 topic-7 2007-06-20 10:16:09.0It is generally believed that correlations in dense polymer solutions (semi-dilute solutions or molten polymer) are short range. This assumption dates back to Flory. Here we discuss long range correlations coming from two effects generally overlooked in standard theories: i)The impact of overall incompressibility on single chain conformations. ii)Non local effects that correct for the spurious contribution of cyclic conformations in the Mean-Field.\\ {\bf i) Intrachain properties} We obtain algebraic bond/bond orientation correlations decaying along the chain as $1/s^{d/2}$. This is in formal analogy with the long-time tail of the velocity auto-corelation function. Systematic deviations of the single chain structure factor from the Debye function describing Gaussian conformations are also obtained. For an infinite chain these take the simple form $\delta\frac{1}{S_1(q)} = \frac{q^3}{32 c}$ independent of both the bare interaction and statistical segment which hence survives renormalization. The effects are enhanced in two dimensions where the topological constraints also become relevant to statics (strict and weak excluded volume systems belong to different universality classes). Agreement with numerical simulations is achieved without free parameter\\ {\bf ii)Collective properties} We show that the usual local Hamiltonian describing density/density correlations leads to inconsistencies. To restore consistency a non-local Hamiltonian has to be introduced which leads to the non-analytical correction $\delta\frac{1}{S(q)} = \frac{q^3}{64 c}$ which is also universal. The deeper reason for the effect is that the local Hamiltonian does not distinguish between open and cyclic conformations. Our treatment amounts to subtract the contribution of cycles to the Mean-Field free energy. We predict long range repulsion between embeded colloids (decaying as $1/r^{2d}$ or $1/h^{d-1}$ at closer separations) cut at the chain radius. Long range correlations also contribute a chain length dependent term to the surface tension.