A coarse-grained bead-spring-dashpot chain model with the dashpots representing presence of internal friction is solved exactly numerically for case chains more than two beads. Using a decoupling procedure to remove explicit coupling bead’s velocity that its nearest neighbors, governing set stochastic differential equations are Brownian dynamics simulations obtain material functions in oscillat...

Internal friction in polycrystalline( Nix Zn,., ) Fe204( where x =0.2, 0.6 and 0.8) films has been measured using one crystal composite oscillator method. The internal friction was recorded at three different frequencies i.e, 60, 100 and 160 KHz in the temperature range of 80 to 600 K. The films used are prepared by rf-sputtering method on quartz plate substate. X-ray analysis was carried out o...

Using low-stress pseudoshear deformation, we measured the ambient-temperaturecreep-recovery behavior of polycrystalline indium. The &+J diagram shows three regions with increasing stress: stress exponents of 1.05, 7.4, and 2.0. The diagram resembles remarkably the dislocation-velocity-shear-stressdiagrams reported for various materials by many authors, who interpreted the diagrams by dislocatio...

Macroscopic objects are usually manipulated by force and observed with light. On the nanoscale, however, this is often done oppositely: individual macromolecules are manipulated by light and monitored with force. This procedure, which is the basis of single-molecule force spectroscopy, has led to much of our quantitative understanding of how DNA works, and is now routinely applied to explore mo...

We consider biofilaments-flexible multimolecule structures common in cell biology-and show how "internal" friction associated with either conformational fluctuations or with fluid flow through narrow pores inside the filaments can dominate the external hydrodynamic friction usually considered to be the main energy dissipation process. The signature of this is wave-number-independent relaxation ...