We investigate the problem of disseminating broadcast messages in wireless networks with time-varying links from a percolation-based perspective. Using a model of wireless networks based on random geometric graphs with dynamic on-off links, we show that the delay for disseminating broadcast information exhibits two behavioral regimes, corresponding to the phase transition of the underlying netw...

We investigate the problem of disseminating broadcast messages in wireless networks with time-varying links from a percolation-based perspective. Using a model of wireless networks based on random geometric graphs with dynamic on-off links, we show that the delay for disseminating broadcast information exhibits two behavioral regimes, corresponding to the phase transition of the underlying netw...

The water/AOT/liquid alkane reverse micelle system has proven to be an effective medium for the production of nanoscale materials and has become a popular area of study. It has been demonstrated that the properties of the bulk alkane phase influence the synthesis of metallic nanoparticles, particularly the ultimate particle size. The use of supercritical fluids as the bulk phase provide a novel...

SUPERCRITICAL CO2 BY AN ELECTRON POOR NI(II) COMPLEX Damien Guironnet and Stefan Mecking* Chair of Chemical Materials Science, Department of Chemistry, University of Konstanz, Germany. Introduction Late transition metal catalysts for polymerization of olefins have been studied intensely. Due to their functional group tolerance, polymerizations can be carried out in oxygenated reaction media, am...

In our current study, supercritical water impregnation (SCWI) was introduced as a unique catalyst preparation method by employing the high diffusivity property of supercritical water. The method allows nano-particles to place on support surfaces in extremely dispersed conditions. The silica-based nanocatalyst granules for this purpose were prepared by initial impregnation of highly porous silic...

In biodiesel production processes using supercritical methanol, the phase equilibria for methanol + fatty acid methyl ester systems near the critical temperature of methanol (Tc = 512.6 K) are required as the fundamental data. A flow type method was applied to measure the vapor-liquid equilibria for methanol + fatty acid methyl ester binary systems at 493 – 543 K. The phase behavior was studied...

Thermophysical properties of dense supercriiicai water with special emphasis on dielectric permittivity are discussed. Phase diagrams and some critical curves of the binary systems H20—H2, H2O—N, H20—02, H20-CH4 and H20-He to 450 °C and 200 MPa are shown. H20-He tas a type I critical curve. A rational equation of state to calculate phase diagrams and critical curves for polar—non polar systems ...

A transient model to simulate the temperature and pressure in CO2 injection wells is proposed solved using finite difference method. The couples variability of properties conservation laws. maximum error between simulated measured results 5.04%. case study shows that phase state primarily controlled by wellbore temperature. Increasing or decreasing rate contributes obtaining supercritical state...

This work presents a study of non-premixed flames at supercritical-pressure conditions. Emphasis is placed on flame stability in liquid rocket engines fueled with liquid oxygen and gaseous hydrogen. The flame structure sensitivity to strain, pressure, temperature and real-fluid effects was investigated in detailed opposed-jet flames calculations. It is shown that the flame is very robust to str...

We have used Gibbs ensemble and histogram-reweighting Monte Carlo techniques to obtain the phase behavior of water and aqueous mixtures at high pressures. These calculations are relevant for the design of high-pressure separation processes, such as supercritical fluid extraction and supercritical water oxidation. In particular, we have obtained the phase behavior of several simple point charge ...