1,386 research outputs found
The evaluation of the rolling moments induced by wraparound fins
A possible reason is suggested for the induced rolling moments occurring on wraparound-fin configurations in subsonic flight at zero angle of attack. The subsonic potential flow over the configuration at zero incidence is solved numerically. The body is simulated by a distribution of sources along its axis, and the fins are described by a vortex-lattice method. It is shown that rolling moments can be induced on the antisymmetric fins by the radial flow generated at the base of the configuration, either over the converging separated wake, or over the diverging plume of a rocket motor
Translocation of a Single Stranded DNA Through a Conformationally Changing Nanopore
We investigate the translocation of a single stranded DNA through a pore
which fluctuates between two conformations, using coupled master equations. The
probability density function of the first passage times (FPT) of the
translocation process is calculated, displaying a triple, double or mono peaked
behavior, depending on the interconversion rates between the conformations, the
applied electric field, and the initial conditions. The cumulative probability
function of the FPT, in a field-free environment, is shown to have two regimes,
characterized by fast and slow timescales. An analytical expression for the
mean first passage time of the translocation process is derived, and provides,
in addition to the interconversion rates, an extensive characterization of the
translocation process. Relationships to experimental observations are
discussed.Comment: 8 pages, 5 figures, Biophys. J., in pres
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