We present here a simple model describing coexistence of solid and vapour phases. The two phases are separated by an interface. We show that when the concentration of supersaturated vapour reaches the dew-point, the droplet of solid is created spontaneously on the interface, adding to it a monolayer of a “visible” size. Mathematics Subject Classification (2000). Primary: 82B20, 82B24 Secondary:...

The aim of this study is to find the optimal water pressure and percentage of supply vapour in the feed water heaters (fwhs) of steam power plants, such that they maximize the thermal efficiency of the Rankine cycle within pre-specified values of minimum and maximum pressures of the thermodynamic cycle. Thermal efficiency is defined as a function of unknown variables (fluid pressure and vap...

The structure of the vapour produced upon heating the dimethylalkoxygallane [Me(2)GaOCH(2)CH(2)NMe(2)](2) has been studied by gas-phase electron diffraction and ab initio molecular orbital calculations; only the monomeric form [Me(2)GaOCH(2)CH(2)NMe(2)] is observed in the vapour, with the nitrogen atom forming a dative bond with the metal centre.

The aim of this study is to find the optimal water pressure and percentage of supply vapour in the feed water heaters (fwhs) of steam power plants, such that they maximize the thermal efficiency of the Rankine cycle within pre-specified values of minimum and maximum pressures of the thermodynamic cycle. Thermal efficiency is defined as a function of unknown variables (fluid pressure and vap...

The aim of this paper is to consider optical and electrical properties of MOVPE GaN homostruture LEDs. The sample that has been selected for the study, doped with Si and Mg for n and p region of junction, respectively. The V-I and L-I characteristics of this device indicate that diffusion and space charge currents have the main role in luminescence, because in this current range defects levels ...

The isotope composition of water vapour: A powerful tool to study transport and chemistry of middle atmospheric water vapour Ch. Bechtel and A. Zahn Institut für Umweltphysik, University of Heidelberg, Heidelberg, Germany Institute of Meteorology and Climate Research, Forschungszentrum Karlsruhe, Germany Received: 11 June 2003 – Accepted: 16 July 2003 – Published: 28 July 2003 Correspondence to...

BACKGROUND The loss of perfluorocarbon (PFC) vapour in the expired gases during partial liquid ventilation should be minimized both to prevent perfluorocarbon vapour entering the atmosphere and to re-use the recovered PFC liquid. Using a substantially modified design of our previously described condenser, we aimed to determine how much perfluorocarbon liquid could be recovered from gases contai...