A hierarchical, multi-scale computer model for the nucleation of nano-phase materials from the vapor phase is presented. The model utilizes full solutions to quantum mechanics cluster energy equations for sizes up to 10 atoms, and statistical rate theory for larger cluster sizes. Ab initio and semi-empirical quantum mechanics methods are used to investigate the energetics of Si and C clusters. ...

When a large amount of water is deposited onto a bare h-BN/Rh(111) nanomesh, the formation of ordered and stable nano-ice crystals in the pores has been experimentally observed. The present work proposes different possible models for the structure of the observed clusters, based on density functional theory calculations of two-dimensional water lattices adsorbed on free-standing hexagonal BN. T...

It is shown that the energy absorption of a rare-gas cluster from a vacuumultraviolet (VUV) pulse can be traced with time-delayed extreme-ultraviolet (XUV) attosecond probe pulses by measuring the kinetic energy of the electrons detached by the probe pulse. By means of this scheme we demonstrate, that for pump pulses as short as one femtosecond, the charging of the cluster proceeds during the f...

Field emission has been reported to occur at much lower fields in carbon based thin film systems than from any other material systems. The emission has been shown to depend on the various material parameters, but whichever carbon based system is used, it is found that emission occurs at localised sites rather than uniformly over the entire surface. Carbon films with mixed sp3 sp2 bonding, like ...

The possibility of producing from 20 nm to 100 nm sized silicon powders by plasma-induced reactions of silane including the formation of high-mass hydrogenated silicon anion clusters has been recently demonstrated. Careful HREM imaging showed circular contrast features, 1.5 to 2.5 nm in size, embedded in the amorphous particles which was attributed to the presence of medium range order in these...

*; $IUCOSS t test for reasons of convenience, economy, and,patient cOs cap and $houddbe*brasiated tea test lastIng 2 hr whsn used to screen patlsnh for detse osit sthsdjes of the laboratory result* abtamed from glucose tsioraace he$t1g suktauiiat4 previous observatsons that the lusting blood sugar level Is an Ia$deqte me*au14 of carbohydrate intolerance Definitive information may be obI*ed fsoa...