Both the optimization of B1 field homogeneity in high-field MRI and the implementation of the exciting new theory of transmit SENSE can be accomplished by individual and independent control of the amplitude and phase of current on the elements or rungs of a radio frequency (RF) transmit coil array. One way of achieving this is by using the concept of the active rung, which consists of one rung ...

We consider semilinear evolution equations for which the linear part generates a strongly continuous semigroup and the nonlinear part is sufficiently smooth on a scale of Hilbert spaces. In this setting, we prove the existence of solutions which are temporally smooth in the norm of the lowest rung of the scale for an open set of initial data on the highest rung of the scale. Under the same assu...

We study three-leg antiferromagnetic Heisenberg model with the periodic boundary conditions in the rung direction. Since the rungs form regular triangles, spin frustration is induced. We use the density-matrix renormalization group method to investigate the ground state. We find that the spin excitations are always gapped to remove the spin frustration as long as the rung coupling is nonzero. W...

We consider a two-leg ladder system with interactions varying from constant rung coupling to systematic diminishing of rung interactions leading to diverging chains. We compare and contrast their ground state and excitation characteristics using density matrix renormalization group methods. We find that the finite spin gap in a constant coupling ladder develops into a gapless excitation with sl...

We report the results of numerical calculations of rung-rung current correlations on a 2-leg t-J ladder with J/t = 0.35 for dopings x = 0.125 and x = 0.19. We find that the amplitude of these correlations decays exponentially. We argue that this can be understood within a bosonization framework in terms of the pinned phase variables associated with a C1SO phase with dx2−y2-like power law pairin...

The purpose of this study was to gain an insight into the kinematics and kinetics of the single-handed dynamic moves on campus board and investigate the effects of increased rung distance on biomechanical parameters. Eight climbers, six males and two females, performed various single-handed dynamic moves on an instrumented campus board. Kinematic and kinetic data were collected during each jump...

The present study examined rats' ability to anticipate undetectable wider gaps between rungs produced when they stepped on and dislodged damaged rungs while they traversed a slightly inclined elevated ladder. Rats in the first of three experiments reduced running speeds when they encountered four evenly spaced damaged rungs either always placed on the first or second half of the ladder (the bre...

Submitted for the MAR13 Meeting of The American Physical Society Dynamical spin correlation function in a frustrated two-leg spinladder system TAKANORI SUGIMOTO, MICHIYASU MORI, ASRC, Japan Atomic Energy Agency; CREST, Japan Science and Technology Agency, TAKAMI TOHYAMA, YITP, Kyoto University, SADAMICHI MAEKAWA, ASRC, Japan Atomic Energy Agency; CREST, Japan Science and Technology Agency — We ...

The ground-state magnetic phase diagram of a spin S = 1/2 two-leg ladder with alternating rung exchange J⊥(n) = J⊥[1 + (−1) nδ] is studied using the analytical and numerical approaches. In the limit where the rung exchange is dominant, we have mapped the model onto the effective quantum sineGordon model with topological term and identified two quantum phase transitions at magnetization equal to...