We report on a detailed study of longitudinal strength in the nucleon resonance region, presenting new results from inclusive electron-proton cross sections measured at Jefferson Lab Hall C four-momentum transfer range 0.2<Q2<5.5GeV2. The data have been used to accurately perform 167 Rosenbluth-type longitudinal/transverse separations. precision R=σL/σT are presented here, along with first sepa...

Zonal ‡ow helps reduce and control the level of ion temperature gradient (ITG) turbulence in a tokamak. The collisional damping of zonal ‡ow has been estimated by Hinton and Rosenbluth (H-R). Their calculation shows that the damping of zonal ‡ow is closely related to the frequency response of neoclassical polarization of the plasma. Based on a variational principle, H-R calculated the neoclassi...

Two-step restricted walk (TSRW) models are a class of restricted self-avoiding walk (SAW) where, in addition to the self-avoidance constraint, certain restrictions are placed upon each pair of successive steps. In this paper, we explore the relationship between the restrictions and the scaling of the average size of walks in three-dimensional models. We use the Prunedenriched Rosenbluth method ...

We propose an interpolation formula (the EV-WLC relation) for the force-extension behavior of wormlike chains in the presence of hard-core excluded volume interactions, analogous to the classic interpolation formula from Marko and Siggia for ideal wormlike chains. Using pruned-enriched Rosenbluth method (PERM) simulations of asymptotically long, discrete wormlike chains in an external force, we...

The adsorption of a single multi-block AB-copolymer on a solid planar substrate is investigated by means of computer simulations and scaling analysis. It is shown that the problem can be mapped onto an effective homopolymer adsorption problem. In particular we discuss how the critical adsorption energy and the fraction of adsorbed monomers depend on the block length M of sticking monomers A, an...

We consider a long, semiflexible polymer with persistence length P and contour length L fluctuating in a narrow cylindrical channel of diameter D. In the regime D<<P<<L the free energy of confinement DeltaF and the length of the channel R parallel occupied by the polymer are given by Odijk's relations DeltaF/R parallel=A(o)kB(TP)-1/3 D(-2/3) and R parallel =L[1-alpha(o)(D/P)2/3], where A(o) and...

In the framework of pertubative QCD it is argued that in the elastic edscattering at Q ∼ few (GeV/c) the light-cone-frame helicity-flip amplitudes could not be omitted. The obtained B A ratio of Rosenbluth structure functions is shown to be in a good agreement with experimental data. The high Q behavior of T20 is discussed. In a recent paper, Brodsky and Hiller [1] have made a general analysis ...

H. Maaßberg , and C.D. Beidler Max-Planck-Institut für Plasmaphysik, EURATOM Association, D-17491 Greifswald, Germany (Dated: March 22, 2010) Abstract Several linearised collision operator models with parallel momentum conservation enforced by source functions are benchmarked against the correct collision operator based on Rosenbluth potentials. The model operators without energy diffusion allo...

Flute oscillations in bounded, non-uniform plasmas are considered from the guiding centre point of view. The effects of field curvature are replaced by generalized forces that are proportional to the parallel and perpendicular components of the particle energy. A perturbation analysis, covering all density regimes and including the finite gyro-radius effects, is carried out in cylindrical co-or...