We consider an open one dimensional lattice gas on sites i=1,..., N, with particles jumping independently with rate 1 to neighboring interior empty sites, the simple symmetric exclusion process. The particle fluxes at the left and right boundaries, corresponding to exchanges with reservoirs at different chemical potentials, create a stationary nonequilibrium state (SNS) with a steady flux of pa...

The coupling of disposable solid-phase microextraction (SPME) with performance reference compounds (PRCs) has been recently introduced to measure time-averaged freely dissolved concentrations (Cfree) of hydrophobic organic contaminants in sediments under laboratory conditions. To explore the use of PRC-SPME for in situ sampling in seawater, disposable PDMS fibers (35-μm and 100-μm coating) prel...

Introduction: Differentiated asteroids in the present-day solar system represent a relic population of the earliest forming planetesimals. Vesta (mean diameter ∼525 km) is the best studied example of a differentiated asteroid. Geochemical evidence from the HED meteorites, which are likely to originate from Vesta, and recent remote sensing data from the NASA Dawn mission indicate that Vesta's su...

Prof. Dr. Martín Aznar Nesta edição do Boletim da FEQ, a descrição da produção científica vem complementada pela informação do fator de impacto (FI) da revista, calculado pelo Web of Science. O fator de impacto é importante porque ajuda o pesquisador a escolher o melhor veículo para divulgar sua pesquisa. Quanto maior o fator de impacto de um veículo, maior a probabilidade de atingir um público...

New evidence bearing upon the anomalous properties of xenon hexafluoride has been obtained via the ab initio molecular orbital approach applied successfully to the diand tetrafluorides in paper 1. Structures of both XeFt and XeF6 are governed by a stereochemically active lone pair. In the case of the square-pyramidal cation the F .. -Xe-Feq angle calculated for the bare ion is within 2° of the ...

Various classes of arrival processes in telecommunication traffic modeling based on heavy-tailed interarrival time distributions exhibit long-range dependence. This includes arrival rate processes of Anick-MitraSondhi (AMS) type where the rate process is an on/off-process with heavy-tailed on-period distribution and/or off-period distribution, as well as generalized Kosten type models (infinite...

Next generation wireless networks have many promising features, such as high datarates, hybrid voice and data services, integration of different wireless access technologies, andintelligent networks with self-maintenance. With these features, several scheduling andresource optimization issues arise. In this dissertation, I aim to address these issues by firstformulating the prob...

Ionized calcium (Ca2+) is an intracellular messenger in nearly all eukaryotic organisms. Calcium waves have been observed in many cell types, including airway epithelia, eggs, hepatocytes, exocrine pancreas, cultured glial cells, and neuronal cells. These waves travel across or between cells without slowing or getting smaller, and so cannot be generated by pure passive diffusion. Rather, the wa...