Total energies, electronic structure, surface energies, polarization, potentials and charge densities were studied for slabs of BaTiO3 using the Linearized Augmented Plane Wave (LAPW) method. The depolarization field inhibits ferroelectricity in the slabs, and the macroscopic field set up across a ferroelectric slab is sufficient to cause electronic states to span the gap and give a metallic ba...

Having a common embryologic origin with the pulmonary veins (PVs), left atrial posterior wall (LAPW) is considered to be source of non-PV triggers that facilitate maintenance fibrillation (AF). However, benefits electrical isolation (PWI) still debated contradictory data originating from different ablation approaches. . We report distribution in LAPW area AF patients undergoing repeat ablation....

The classic metallurgical systems—noble-metal alloys—that have formed the benchmark for various alloy theories are revisited. First-principles fully relaxed general-potential linearized augmented plane-wave ~LAPW! total energies of a few ordered structures are used as input to a mixed-space cluster expansion calculation to study the phase stability, thermodynamic properties, and bond lengths in...

BACKGROUND It is not clear whether bidirectional block (BDB) of linear ablations reduces atrial fibrillation (AF) recurrence after radiofrequency catheter ablation. We hypothesized that BDB of linear ablation has prognostic significance after radiofrequency catheter ablation for persistent AF. METHODS AND RESULTS Among 1793 consecutive patients in the Yonsei AF ablation cohort, this observati...