A general spin-state model and a qualitative physical picture have been proposed for a class of lately synthesized layered cobalt oxides (LCOs) by means of density functional calculations. As the plane corrugation of the cobalt-oxygen layer decreases, the LCOs evolve from a high-spin (HS) superexchangecoupled antiferromagnetic (AFM) insulator to an almost-HS AFM/ferromagnetic (FM) competing sys...

Using molecular dynamics simulations of a coarse-grained polymer liquid we investigate the transport of droplets on asymmetrically structured (saw-tooth shaped), vibrating substrates. Due to a continuous supply of power by substrate vibrations and the asymmetry of its topography, the droplets are driven in a preferred direction. We study this directed motion as a function of the size of the dro...

To quantify the relationship between both regional and overall diaphragm morphometry and body weight in the dog, diaphragm thickness was measured in five regions of the costal diaphragm and three regions of the crural diaphragm in 40 healthy dogs (8-40 kg). Surface area of the diaphragm, diaphragm weight, and body weight were also determined. Diaphragm surface area and weight varied linearly wi...

In most cases, structural engineers assume a concrete floor to be a rigid diaphragm. Although this simplification is in most cases acceptable, it should be noted that such an assumption may be distrusted due to certain problems. Concrete structures with staggered shear walls are among those whose analysis should be conducted with special concern for the behavior of their floor diaphragms. Howev...

We report the discovery of a metal adatom induced corrugation of Cu(001) as probed by atom beam scattering (ABS). At Pb or Bi coverages of 0.05 (fraction of Cu layer), and while a (1×1) LEED pattern is still observed, the ABS diffraction pattern from uncovered Cu(001) areas has changed considerably from that of clean Cu(001). We show that these uncovered areas have become up to ten times more c...

The second layer of 4He adsorbed on a graphite substrate is studied by Quantum Monte Carlo simulations. We make use microscopic model the fully accounting for its corrugation, and compare results to those obtained with smooth substrate. only effect corrugation ∼20% reduction value superfluid fraction top layer, in limit zero temperature. No evidence any commensurate (7/12) crystalline and/or “s...

The friction of graphene on various substrates, such as SiO2, h-BN, bulk-like graphene, and mica, was investigated to characterize the adhesion level between graphene and the underlying surface. The friction of graphene on SiO2 decreased with increasing thickness and converged around the penta-layers due to incomplete contact between the two surfaces. However, the friction of graphene on an ato...

A theory based in the semiclassical eikonal approximation is developed to describe energy transfer in the collision of an atomic projectile with a surface which is either ordered or disordered. This theory is extended from the quantum mechanical regime to the classical regime of complete quantum decoherence via the Bohr correspondence principle of large numbers of excited quanta. In the quantum...