Monolayers presenting methyl-terminated (hydrophobic) and hydroxyl-terminated (hydrophilic) surfaces on silica have been studied by molecular dynamics simulation and the effects of hydrogen bonding, chain length, and chain mixing on the frictional properties determined. The hydroxyl-terminated monolayers were found to show large adhesion zones as a result of strong interfacial interlayer hydrog...

Previous investigators have reported that oxygen consumption (VO2) continues to rise after the initial 2- to 3-min transient period of exercise when work exceeds approximately 60% of VO2 max. The purpose of this investigation was to examine the possible causes of this slow rise in VO2. Eighteen subjects exercised for 20 min at 65% and at 80% of VO2 max on the bicycle ergometer. VO2, ventilation...

We investigate the free cooling of inelastic rough spheres in the presence of Coulomb friction. Depending on the coefficients of normal restitution ǫ and Coulomb friction μ, we find qualitatively different asymptotic states. For nearly complete normal restitution (ǫ close to 1) and large μ, friction does not change the cooling properties qualitatively compared to a constant coefficient of tange...

where ut = ∂u ∂t and ∆ =∑ni=1 ∂2 ∂xi is the usual Laplace operator, Ω is a bounded smooth domain in Rn, υ is the unit outer normal to ∂Ω, and u0 is a realvalued continuous function (not identically zero) representing the initial heat distribution. Here the boundary condition implies that (1) is an isolated system. It is well known that the solution u(x, t) of (1) becomes smooth as soon as t bec...

2014 We present piezospectroscopic studies of the absorption bands due to the 6A1g ~ 4T1g(I, II), 4T2g(I, II) optical transitions of RbMnF3. For the 4T2g unstructured absorption band we have deduced the coupling parameters involving the Eg and T2g modes of vibration. The piezospectroscopic behaviour of the 6A1g ~ 4T1g(I) magnetic dipole transition is analysed to directly obtain the coupling par...

describes the evolution of graph(u(·, t)) by its mean curvature in the direction of the unit normal with prescribed contact angle (given by cos−1 φ) at boundary. This problem has been studied by G. Huisken [3] for φ ≡ 0, that is, the surfaces have vertical contact angle at the boundary, and by Altschuler and Wu [1] for the case that n = 2 and Ω is strictly convex. The main result of [3] states ...

BACKGROUND AND PURPOSE HIV enters the CNS early in the course of infection and produces neuropsychiatric impairment throughout the course of illness, which preferentially affects the subcortical white matter. The development of a neuroimaging marker of HIV may allow for the earliest detection of cognitive impairment. The purpose of this study was to determine whether MR diffusion tensor imaging...